Related literature {#sec1}
==================

For related literature, see: Song *et al.* (2007[@bb5]).

Experimental {#sec2}
============

 {#sec2.1}

### Crystal data {#sec2.1.1}

\[Ni(C~8~H~7~O~2~)~2~(C~5~H~5~N)~2~(H~2~O)\]*M* *~r~* = 505.20Monoclinic,*a* = 13.6181 (1) Å*b* = 5.9526 (1) Å*c* = 15.1380 (2) Åβ = 107.215 (1)°*V* = 1172.16 (3) Å^3^*Z* = 2Mo *K*α radiationμ = 0.87 mm^−1^*T* = 296 (2) K0.26 × 0.23 × 0.20 mm

### Data collection {#sec2.1.2}

Bruker APEXII area-detector diffractometerAbsorption correction: multi-scan (*SADABS*; Sheldrick, 1996[@bb3]) *T* ~min~ = 0.806, *T* ~max~ = 0.84611325 measured reflections5102 independent reflections4798 reflections with *I* \> 2σ(*I*)*R* ~int~ = 0.023

### Refinement {#sec2.1.3}

*R*\[*F* ^2^ \> 2σ(*F* ^2^)\] = 0.028*wR*(*F* ^2^) = 0.065*S* = 1.035102 reflections315 parameters4 restraintsH atoms treated by a mixture of independent and constrained refinementΔρ~max~ = 0.25 e Å^−3^Δρ~min~ = −0.28 e Å^−3^Absolute structure: Flack (1983[@bb2])Flack parameter: 0.00

 {#d5e622}

Data collection: *APEX2* (Bruker, 2004[@bb1]); cell refinement: *SAINT* (Bruker, 2004[@bb1]); data reduction: *SAINT*; program(s) used to solve structure: *SHELXS97* (Sheldrick, 2008[@bb4]); program(s) used to refine structure: *SHELXL97* (Sheldrick, 2008[@bb4]); molecular graphics: *XP* in *SHELXTL* (Sheldrick, 2008[@bb4]); software used to prepare material for publication: *SHELXL97* and *XP* in *SHELXTL*.

Supplementary Material
======================

Crystal structure: contains datablocks I, global. DOI: [10.1107/S160053680800634X/kp2154sup1.cif](http://dx.doi.org/10.1107/S160053680800634X/kp2154sup1.cif)

Structure factors: contains datablocks I. DOI: [10.1107/S160053680800634X/kp2154Isup2.hkl](http://dx.doi.org/10.1107/S160053680800634X/kp2154Isup2.hkl)

Additional supplementary materials: [crystallographic information](http://scripts.iucr.org/cgi-bin/sendsupfiles?kp2154&file=kp2154sup0.html&mime=text/html); [3D view](http://scripts.iucr.org/cgi-bin/sendcif?kp2154sup1&Qmime=cif); [checkCIF report](http://scripts.iucr.org/cgi-bin/paper?kp2154&checkcif=yes)

Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: [KP2154](http://scripts.iucr.org/cgi-bin/sendsup?kp2154)).

The authors acknowledge Guang Dong Ocean University for supporting this work.

Comment
=======

In the structural investigation of 4-methylbenzoate complexes, it has been found that the 4-methylbenzoic acid functions as a multidentate ligand \[Song *et al.* (2007)\] with versatile binding and coordination modes. In this paper, we report the crystal structure of the title compound, (I), a new Ni complex obtained by the reaction of 4-methylbenzoic acid, pyridine and nickel chloride in alkaline aqueous solution.

The Ni^II^ atom exhibits a disordered octahedral environment (Fig. 1, Table 1) defined by three carboxyl O atoms from one bidentate 4-methylbenzoate ligand and one monodentate 4-methylbenzoate ligand, two N atoms from two pyridine ligands and a water molecule. The intermolecular O---H···O hydrogen bond (Table 2, Fig. 2) between the coordinated water molecule and carboxy O atom of 4-methylbenzoate ligand generates a chain along the axis b. The intermolecular hydrogen bond C1---H1···O also involves water molecule \[3.339 (3) %A, 145%\]. An intramolecular hydrogen bond connects the coordinated water molecule and uncoordinated oxygen atom O4 (Table 2). C---H···π interactions connect hydrogen bonded chains: C~3~-- H~3~···C~g~ (C~12~→ C~17~, symmetry code: -2 - *x*, 1/2 + *y*, 2 - *z*) of 3.482 (2) %A; 132%, and C~14~-- H14···C~g~(C~12~→ C~17~, symmetry code: 1 - *x*, -1/2 + *y*, 2 - *z*) of 3.603 (2) %A; 134%; C~22~-- H22···C~g~(C~20~→ C~25~, symmetry code: 2 - *x*, -1/2 + *y*, 1 - *z*) of 3.504 (2) %A; 133%.

Experimental {#experimental}
============

A mixture of nickel chloride (1 mmol), 4-methylbenzoic acid (1 mmol), pyridine(1 mmol), NaOH (1.5 mmol) and H~2~O (12 ml) were placed into a 23 ml Teflon reactor, which was heated to 433 K for three days and then cooled to room temperature at a rate of 10 K h^-1^. The crystals obtained were washed with water and dryed in air.

Refinement {#refinement}
==========

Carbon-bound H atoms were placed at calculated positions and were treated as riding on the parent C atoms with C---H = 0.93 Å for aromatic rings, C---H = 0.96 Å for methyl group, and with *U*~iso~(H) = 1.2 *U*~eq~(C). Water H atoms were tentatively located in difference Fourier maps and were refined with distance restraints of O--H = 0.82 Å and H···H = 1.29 Å, each within a standard deviation of 0.01 Å; and with *U*~iso~(H) = 1.5 *U*~eq~(O).

Figures
=======

![The structure of (I) showing the atomic numbering scheme and octahedral coordination of NiII. Non-H atoms are shown with the 30% probability displacement ellipsoids.](e-64-0m548-fig1){#Fap1}

![The crystal packing of (I). The intermolecluar hydrogen bonds are shown as dashed lines.](e-64-0m548-fig2){#Fap2}

Crystal data {#tablewrapcrystaldatalong}
============

  ---------------------------------------------- ---------------------------------------
  \[Ni(C~8~H~7~O~2~)~2~(C~5~H~5~N)~2~(H~2~O)\]   *F*~000~ = 528
  *M~r~* = 505.20                                *D*~x~ = 1.431 Mg m^−3^
  Monoclinic, *P*2~1~                            Mo *K*α radiation λ = 0.71073 Å
  Hall symbol: P 2yb                             Cell parameters from 4520 reflections
  *a* = 13.61810 (10) Å                          θ = 1.4--28º
  *b* = 5.95260 (10) Å                           µ = 0.87 mm^−1^
  *c* = 15.1380 (2) Å                            *T* = 296 (2) K
  β = 107.2150 (10)º                             Block, blue
  *V* = 1172.16 (3) Å^3^                         0.26 × 0.23 × 0.20 mm
  *Z* = 2                                        
  ---------------------------------------------- ---------------------------------------

Data collection {#tablewrapdatacollectionlong}
===============

  ------------------------------------------------------------ --------------------------------------
  Bruker APEXII area-detector diffractometer                   5102 independent reflections
  Radiation source: fine-focus sealed tube                     4798 reflections with *I* \> 2σ(*I*)
  Monochromator: graphite                                      *R*~int~ = 0.023
  *T* = 296(2) K                                               θ~max~ = 27.5º
  φ and ω scans                                                θ~min~ = 1.6º
  Absorption correction: multi-scan(SADABS; Sheldrick, 1996)   *h* = −17→17
  *T*~min~ = 0.806, *T*~max~ = 0.846                           *k* = −7→7
  11325 measured reflections                                   *l* = −19→17
  ------------------------------------------------------------ --------------------------------------

Refinement {#tablewraprefinementdatalong}
==========

  ---------------------------------------------------------------- ---------------------------------------------------------------------------------------------------
  Refinement on *F*^2^                                             Hydrogen site location: inferred from neighbouring sites
  Least-squares matrix: full                                       H atoms treated by a mixture of independent and constrained refinement
  *R*\[*F*^2^ \> 2σ(*F*^2^)\] = 0.028                                *w* = 1/\[σ^2^(*F*~o~^2^) + (0.0307*P*)^2^ + 0.1736*P*\] where *P* = (*F*~o~^2^ + 2*F*~c~^2^)/3
  *wR*(*F*^2^) = 0.065                                             (Δ/σ)~max~ = 0.001
  *S* = 1.04                                                       Δρ~max~ = 0.25 e Å^−3^
  5102 reflections                                                 Δρ~min~ = −0.28 e Å^−3^
  315 parameters                                                   Extinction correction: none
  4 restraints                                                     Absolute structure: Flack (1983)
  Primary atom site location: structure-invariant direct methods   Flack parameter: 0.00
  Secondary atom site location: difference Fourier map             
  ---------------------------------------------------------------- ---------------------------------------------------------------------------------------------------

Special details {#specialdetails}
===============

  -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
  Geometry. All e.s.d.\'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.\'s are taken into account individually in the estimation of e.s.d.\'s in distances, angles and torsion angles; correlations between e.s.d.\'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.\'s is used for estimating e.s.d.\'s involving l.s. planes.
  Refinement. Refinement of *F*^2^ against ALL reflections. The weighted *R*-factor *wR* and goodness of fit *S* are based on *F*^2^, conventional *R*-factors *R* are based on *F*, with *F* set to zero for negative *F*^2^. The threshold expression of *F*^2^ \> σ(*F*^2^) is used only for calculating *R*-factors(gt) *etc*. and is not relevant to the choice of reflections for refinement. *R*-factors based on *F*^2^ are statistically about twice as large as those based on *F*, and *R*- factors based on ALL data will be even larger.
  -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å^2^) {#tablewrapcoords}
==================================================================================================

  ------ --------------- ------------- --------------- -------------------- --
         *x*             *y*           *z*             *U*~iso~\*/*U*~eq~   
  C1     0.95095 (15)    0.1169 (4)    0.82231 (15)    0.0247 (4)           
  H1     0.9142          0.0108        0.7803          0.030\*              
  C2     1.05343 (16)    0.0757 (4)    0.86802 (16)    0.0296 (5)           
  H2     1.0845          −0.0563       0.8571          0.036\*              
  C3     1.10915 (16)    0.2322 (4)    0.92999 (16)    0.0305 (5)           
  H3     1.1782          0.2083        0.9613          0.037\*              
  C4     1.06002 (16)    0.4243 (4)    0.94418 (15)    0.0292 (5)           
  H4     1.0954          0.5331        0.9855          0.035\*              
  C5     0.95739 (16)    0.4540 (4)    0.89642 (15)    0.0261 (5)           
  H5     0.9250          0.5847        0.9067          0.031\*              
  C6     0.55162 (16)    0.2440 (4)    0.62678 (16)    0.0272 (5)           
  H6     0.5903          0.1158        0.6259          0.033\*              
  C7     0.45288 (17)    0.2553 (4)    0.56751 (17)    0.0322 (5)           
  H7     0.4258          0.1367        0.5278          0.039\*              
  C8     0.39535 (17)    0.4435 (4)    0.56807 (18)    0.0352 (6)           
  H8     0.3286          0.4545        0.5288          0.042\*              
  C9     0.43788 (17)    0.6170 (4)    0.62781 (17)    0.0345 (5)           
  H9     0.4004          0.7468        0.6292          0.041\*              
  C10    0.53759 (16)    0.5937 (4)    0.68568 (15)    0.0273 (5)           
  H10    0.5661          0.7104        0.7260          0.033\*              
  C11    0.69445 (14)    0.1687 (3)    0.88686 (14)    0.0200 (4)           
  C12    0.66663 (15)    0.0548 (4)    0.96375 (14)    0.0214 (4)           
  C13    0.62152 (14)    −0.1580 (4)   0.95154 (13)    0.0227 (4)           
  H13    0.6066          −0.2280       0.8941          0.027\*              
  C14    0.59873 (15)    −0.2661 (4)   1.02416 (15)    0.0257 (5)           
  H14    0.5669          −0.4059       1.0143          0.031\*              
  C15    0.62267 (15)    −0.1690 (4)   1.11155 (14)    0.0263 (5)           
  C16    0.66774 (16)    0.0436 (4)    1.12359 (15)    0.0289 (5)           
  H16    0.6843          0.1115        1.1815          0.035\*              
  C17    0.68834 (16)    0.1557 (4)    1.05043 (15)    0.0252 (4)           
  H17    0.7168          0.2990        1.0594          0.030\*              
  C18    0.6011 (2)      −0.2912 (5)   1.19129 (17)    0.0405 (6)           
  H18A   0.6522          −0.2515       1.2479          0.061\*              
  H18B   0.6030          −0.4503       1.1816          0.061\*              
  H18C   0.5343          −0.2494       1.1950          0.061\*              
  C19    0.78596 (14)    0.4041 (4)    0.58580 (14)    0.0216 (5)           
  C20    0.82429 (14)    0.3106 (3)    0.50984 (14)    0.0209 (5)           
  C21    0.87038 (15)    0.0988 (4)    0.51907 (15)    0.0237 (4)           
  H21    0.8747          0.0125        0.5713          0.028\*              
  C22    0.90959 (16)    0.0170 (4)    0.45091 (15)    0.0258 (5)           
  H22    0.9409          −0.1235       0.4584          0.031\*              
  C23    0.90311 (16)    0.1405 (4)    0.37128 (15)    0.0285 (5)           
  C24    0.85529 (15)    0.3503 (5)    0.36190 (13)    0.0294 (4)           
  H24    0.8491          0.4350        0.3089          0.035\*              
  C25    0.81695 (16)    0.4341 (4)    0.43050 (15)    0.0258 (5)           
  H25    0.7859          0.5748        0.4232          0.031\*              
  C26    0.9479 (2)      0.0517 (5)    0.29837 (16)    0.0423 (6)           
  H26A   0.8973          0.0607        0.2389          0.063\*              
  H26B   0.9682          −0.1020       0.3118          0.063\*              
  H26C   1.0068          0.1398        0.2980          0.063\*              
  N1     0.90261 (12)    0.3038 (3)    0.83626 (12)    0.0219 (4)           
  N2     0.59440 (12)    0.4102 (3)    0.68585 (12)    0.0213 (4)           
  Ni1    0.748180 (17)   0.36693 (5)   0.764977 (16)   0.01841 (7)          
  O1     0.69972 (10)    0.0586 (2)    0.81637 (9)     0.0226 (3)           
  O2     0.71436 (10)    0.3781 (4)    0.89227 (9)     0.0241 (3)           
  O3     0.78210 (11)    0.2707 (2)    0.64966 (10)    0.0232 (3)           
  O4     0.76152 (12)    0.6085 (3)    0.58101 (10)    0.0310 (4)           
  O1W    0.78338 (11)    0.6967 (2)    0.75308 (10)    0.0245 (3)           
  H2W    0.7754 (18)     0.715 (4)     0.6978 (7)      0.037\*              
  H1W    0.7470 (16)     0.789 (3)     0.7669 (14)     0.037\*              
  ------ --------------- ------------- --------------- -------------------- --

Atomic displacement parameters (Å^2^) {#tablewrapadps}
=====================================

  ----- -------------- -------------- -------------- -------------- ------------- ---------------
        *U*^11^        *U*^22^        *U*^33^        *U*^12^        *U*^13^       *U*^23^
  C1    0.0227 (10)    0.0198 (10)    0.0305 (11)    −0.0009 (9)    0.0060 (9)    −0.0009 (9)
  C2    0.0248 (11)    0.0261 (12)    0.0374 (13)    0.0035 (10)    0.0083 (9)    0.0022 (10)
  C3    0.0191 (10)    0.0396 (14)    0.0307 (12)    −0.0009 (10)   0.0041 (9)    0.0063 (11)
  C4    0.0276 (10)    0.0332 (15)    0.0241 (11)    −0.0077 (9)    0.0036 (9)    −0.0048 (9)
  C5    0.0287 (11)    0.0266 (11)    0.0232 (11)    0.0003 (9)     0.0079 (9)    −0.0019 (8)
  C6    0.0235 (10)    0.0251 (12)    0.0319 (12)    0.0003 (9)     0.0066 (9)    −0.0033 (10)
  C7    0.0285 (12)    0.0341 (13)    0.0308 (13)    −0.0050 (11)   0.0038 (10)   −0.0029 (10)
  C8    0.0218 (10)    0.0407 (14)    0.0387 (14)    −0.0009 (10)   0.0021 (10)   0.0098 (10)
  C9    0.0245 (11)    0.0316 (13)    0.0466 (15)    0.0077 (10)    0.0092 (10)   0.0048 (11)
  C10   0.0279 (11)    0.0249 (11)    0.0293 (11)    0.0008 (9)     0.0087 (9)    −0.0014 (9)
  C11   0.0161 (9)     0.0205 (11)    0.0235 (10)    0.0041 (8)     0.0061 (8)    0.0006 (8)
  C12   0.0189 (9)     0.0206 (11)    0.0253 (10)    0.0048 (8)     0.0075 (8)    0.0004 (9)
  C13   0.0230 (8)     0.0204 (12)    0.0239 (9)     0.0016 (9)     0.0056 (7)    −0.0027 (10)
  C14   0.0229 (10)    0.0232 (11)    0.0316 (12)    −0.0011 (9)    0.0089 (9)    −0.0001 (9)
  C15   0.0252 (9)     0.0285 (15)    0.0271 (10)    0.0042 (9)     0.0108 (8)    0.0047 (10)
  C16   0.0294 (11)    0.0341 (13)    0.0224 (11)    0.0022 (10)    0.0067 (9)    −0.0055 (10)
  C17   0.0251 (10)    0.0218 (11)    0.0284 (11)    0.0000 (9)     0.0076 (9)    −0.0040 (9)
  C18   0.0501 (15)    0.0426 (15)    0.0337 (14)    0.0007 (13)    0.0202 (12)   0.0064 (12)
  C19   0.0159 (8)     0.0243 (15)    0.0230 (10)    0.0013 (9)     0.0032 (7)    −0.0002 (9)
  C20   0.0156 (8)     0.0236 (12)    0.0222 (10)    −0.0017 (7)    0.0037 (7)    −0.0029 (8)
  C21   0.0202 (9)     0.0229 (11)    0.0275 (11)    0.0000 (9)     0.0065 (8)    0.0020 (9)
  C22   0.0231 (10)    0.0220 (11)    0.0327 (12)    0.0028 (9)     0.0089 (9)    −0.0038 (10)
  C23   0.0258 (10)    0.0332 (13)    0.0272 (11)    −0.0001 (9)    0.0090 (9)    −0.0065 (10)
  C24   0.0350 (10)    0.0332 (12)    0.0216 (9)     0.0018 (13)    0.0106 (8)    0.0035 (13)
  C25   0.0258 (10)    0.0223 (11)    0.0290 (11)    0.0034 (8)     0.0076 (9)    0.0018 (8)
  C26   0.0485 (15)    0.0510 (17)    0.0313 (13)    0.0134 (13)    0.0177 (11)   −0.0049 (13)
  N1    0.0202 (8)     0.0233 (10)    0.0221 (8)     −0.0003 (6)    0.0061 (7)    0.0014 (7)
  N2    0.0198 (7)     0.0215 (12)    0.0228 (8)     −0.0004 (7)    0.0066 (6)    −0.0004 (7)
  Ni1   0.01837 (11)   0.01668 (11)   0.02025 (11)   0.00073 (12)   0.00583 (8)   −0.00085 (14)
  O1    0.0258 (7)     0.0196 (7)     0.0244 (7)     0.0010 (6)     0.0103 (6)    −0.0028 (6)
  O2    0.0285 (6)     0.0193 (7)     0.0264 (7)     −0.0009 (9)    0.0110 (5)    −0.0020 (9)
  O3    0.0260 (7)     0.0231 (7)     0.0221 (8)     0.0015 (6)     0.0097 (6)    −0.0011 (6)
  O4    0.0437 (9)     0.0232 (8)     0.0288 (8)     0.0098 (7)     0.0151 (7)    0.0014 (7)
  O1W   0.0283 (7)     0.0186 (8)     0.0274 (8)     0.0013 (6)     0.0097 (6)    −0.0031 (7)
  ----- -------------- -------------- -------------- -------------- ------------- ---------------

Geometric parameters (Å, °) {#tablewrapgeomlong}
===========================

  ------------------- ------------- ------------------- -------------
  C1---N1             1.341 (3)     C15---C18           1.511 (3)
  C1---C2             1.384 (3)     C16---C17           1.391 (3)
  C1---H1             0.9300        C16---H16           0.9300
  C2---C3             1.379 (3)     C17---H17           0.9300
  C2---H2             0.9300        C18---H18A          0.9600
  C3---C4             1.373 (3)     C18---H18B          0.9600
  C3---H3             0.9300        C18---H18C          0.9600
  C4---C5             1.382 (3)     C19---O4            1.258 (3)
  C4---H4             0.9300        C19---O3            1.264 (3)
  C5---N1             1.335 (3)     C19---C20           1.503 (3)
  C5---H5             0.9300        C20---C25           1.386 (3)
  C6---N2             1.345 (3)     C20---C21           1.396 (3)
  C6---C7             1.380 (3)     C21---C22           1.383 (3)
  C6---H6             0.9300        C21---H21           0.9300
  C7---C8             1.369 (3)     C22---C23           1.393 (3)
  C7---H7             0.9300        C22---H22           0.9300
  C8---C9             1.382 (4)     C23---C24           1.396 (4)
  C8---H8             0.9300        C23---C26           1.506 (3)
  C9---C10            1.388 (3)     C24---C25           1.386 (3)
  C9---H9             0.9300        C24---H24           0.9300
  C10---N2            1.338 (3)     C25---H25           0.9300
  C10---H10           0.9300        C26---H26A          0.9600
  C11---O1            1.272 (2)     C26---H26B          0.9600
  C11---O2            1.273 (3)     C26---H26C          0.9600
  C11---C12           1.490 (3)     N1---Ni1            2.0941 (17)
  C12---C17           1.393 (3)     N2---Ni1            2.0981 (16)
  C12---C13           1.396 (3)     Ni1---O3            2.0165 (14)
  C13---C14           1.386 (3)     Ni1---O1W           2.0412 (15)
  C13---H13           0.9300        Ni1---O2            2.1107 (12)
  C14---C15           1.391 (3)     Ni1---O1            2.1710 (15)
  C14---H14           0.9300        O1W---H2W           0.819 (9)
  C15---C16           1.395 (3)     O1W---H1W           0.809 (9)
                                                        
  N1---C1---C2        122.5 (2)     H18B---C18---H18C   109.5
  N1---C1---H1        118.7         O4---C19---O3       125.6 (2)
  C2---C1---H1        118.7         O4---C19---C20      117.39 (19)
  C3---C2---C1        119.4 (2)     O3---C19---C20      117.1 (2)
  C3---C2---H2        120.3         C25---C20---C21     118.70 (19)
  C1---C2---H2        120.3         C25---C20---C19     120.93 (19)
  C4---C3---C2        118.2 (2)     C21---C20---C19     120.35 (18)
  C4---C3---H3        120.9         C22---C21---C20     120.3 (2)
  C2---C3---H3        120.9         C22---C21---H21     119.8
  C3---C4---C5        119.3 (2)     C20---C21---H21     119.8
  C3---C4---H4        120.4         C21---C22---C23     121.3 (2)
  C5---C4---H4        120.4         C21---C22---H22     119.3
  N1---C5---C4        123.1 (2)     C23---C22---H22     119.3
  N1---C5---H5        118.5         C22---C23---C24     117.94 (19)
  C4---C5---H5        118.5         C22---C23---C26     120.9 (2)
  N2---C6---C7        122.9 (2)     C24---C23---C26     121.2 (2)
  N2---C6---H6        118.5         C25---C24---C23     120.9 (2)
  C7---C6---H6        118.5         C25---C24---H24     119.5
  C8---C7---C6        119.0 (2)     C23---C24---H24     119.5
  C8---C7---H7        120.5         C20---C25---C24     120.8 (2)
  C6---C7---H7        120.5         C20---C25---H25     119.6
  C7---C8---C9        119.1 (2)     C24---C25---H25     119.6
  C7---C8---H8        120.5         C23---C26---H26A    109.5
  C9---C8---H8        120.5         C23---C26---H26B    109.5
  C8---C9---C10       118.7 (2)     H26A---C26---H26B   109.5
  C8---C9---H9        120.6         C23---C26---H26C    109.5
  C10---C9---H9       120.6         H26A---C26---H26C   109.5
  N2---C10---C9       122.7 (2)     H26B---C26---H26C   109.5
  N2---C10---H10      118.7         C5---N1---C1        117.51 (18)
  C9---C10---H10      118.7         C5---N1---Ni1       120.29 (14)
  O1---C11---O2       119.64 (18)   C1---N1---Ni1       122.19 (14)
  O1---C11---C12      120.77 (18)   C10---N2---C6       117.56 (17)
  O2---C11---C12      119.58 (17)   C10---N2---Ni1      125.46 (14)
  C17---C12---C13     118.57 (19)   C6---N2---Ni1       116.87 (14)
  C17---C12---C11     120.52 (19)   O3---Ni1---O1W      94.41 (6)
  C13---C12---C11     120.87 (18)   O3---Ni1---N1       86.71 (6)
  C14---C13---C12     120.61 (19)   O1W---Ni1---N1      89.53 (6)
  C14---C13---H13     119.7         O3---Ni1---N2       89.22 (6)
  C12---C13---H13     119.7         O1W---Ni1---N2      92.99 (6)
  C13---C14---C15     121.1 (2)     N1---Ni1---N2       175.36 (7)
  C13---C14---H14     119.4         O3---Ni1---O2       165.26 (7)
  C15---C14---H14     119.4         O1W---Ni1---O2      99.83 (8)
  C14---C15---C16     118.13 (19)   N1---Ni1---O2       89.57 (6)
  C14---C15---C18     120.9 (2)     N2---Ni1---O2       93.83 (6)
  C16---C15---C18     121.0 (2)     O3---Ni1---O1       104.00 (6)
  C17---C16---C15     121.1 (2)     O1W---Ni1---O1      161.59 (5)
  C17---C16---H16     119.5         N1---Ni1---O1       91.67 (6)
  C15---C16---H16     119.5         N2---Ni1---O1       87.17 (6)
  C16---C17---C12     120.4 (2)     O2---Ni1---O1       61.82 (7)
  C16---C17---H17     119.8         C11---O1---Ni1      87.92 (12)
  C12---C17---H17     119.8         C11---O2---Ni1      90.59 (12)
  C15---C18---H18A    109.5         C19---O3---Ni1      123.76 (14)
  C15---C18---H18B    109.5         Ni1---O1W---H2W     104.8 (19)
  H18A---C18---H18B   109.5         Ni1---O1W---H1W     117.0 (18)
  C15---C18---H18C    109.5         H2W---O1W---H1W     105.6 (15)
  H18A---C18---H18C   109.5                             
  ------------------- ------------- ------------------- -------------

Hydrogen-bond geometry (Å, °) {#tablewraphbondslong}
=============================

  ------------------- ----------- ------------ ----------- ---------------
  *D*---H···*A*       *D*---H     H···*A*      *D*···*A*   *D*---H···*A*
  O1W---H2W···O4      0.819 (9)   1.834 (13)   2.587 (2)   152 (2)
  O1W---H1W···O1^i^   0.809 (9)   1.957 (12)   2.739 (2)   162 (2)
  ------------------- ----------- ------------ ----------- ---------------

Symmetry codes: (i) *x*, *y*+1, *z*.

###### Selected geometric parameters (Å, °)

  ------------- -------------
  N1---Ni1      2.0941 (17)
  N2---Ni1      2.0981 (16)
  Ni1---O3      2.0165 (14)
  Ni1---O1*W*   2.0412 (15)
  Ni1---O2      2.1107 (12)
  Ni1---O1      2.1710 (15)
  ------------- -------------

  ------------------ ------------
  O3---Ni1---O1*W*   94.41 (6)
  O3---Ni1---N1      86.71 (6)
  O1*W*---Ni1---N1   89.53 (6)
  O3---Ni1---N2      89.22 (6)
  O1*W*---Ni1---N2   92.99 (6)
  N1---Ni1---N2      175.36 (7)
  O3---Ni1---O2      165.26 (7)
  O1*W*---Ni1---O2   99.83 (8)
  N1---Ni1---O2      89.57 (6)
  N2---Ni1---O2      93.83 (6)
  O3---Ni1---O1      104.00 (6)
  O1*W*---Ni1---O1   161.59 (5)
  N1---Ni1---O1      91.67 (6)
  N2---Ni1---O1      87.17 (6)
  O2---Ni1---O1      61.82 (7)
  ------------------ ------------

###### Hydrogen-bond geometry (Å, °)

  *D*---H⋯*A*           *D*---H     H⋯*A*        *D*⋯*A*     *D*---H⋯*A*
  --------------------- ----------- ------------ ----------- -------------
  O1*W*---H2*W*⋯O4      0.819 (9)   1.834 (13)   2.587 (2)   152 (2)
  O1*W*---H1*W*⋯O1^i^   0.809 (9)   1.957 (12)   2.739 (2)   162 (2)

Symmetry code: (i) .
