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

For crystallographic data of tetra­kis­(pyridin-2-yl-meth­yl)alkyl-diamine compounds, see: Fujihara *et al.* (2004[@bb9]); Mam­banda *et al.* (2007[@bb10]). For the superoxide dismutase activity of iron complexes, see: Tamura *et al.* (2000[@bb12]). For dinuclear Pt complexes of similar ligands, see: Ertürk *et al.* (2007[@bb8]). For the use of the dipicolyl­amine moiety for binding of the *M*(CO)~3~ core (*M* = Re,^99*m*^Tc), see: Bartholomä *et al.* (2009[@bb5]). For crystal structures closely related to the title compound, see: Bartholomä *et al.* (2010*a* [@bb2],*b* [@bb3],*c* [@bb4],*d* [@bb1]).

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

 {#sec2.1}

### Crystal data {#sec2.1.1}

\[Cu~2~Br~4~(C~28~H~32~N~6~)\]*M* *~r~* = 899.32Monoclinic,*a* = 8.8613 (6) Å*b* = 14.249 (1) Å*c* = 11.9488 (9) Åβ = 98.588 (2)°*V* = 1491.80 (18) Å^3^*Z* = 2Mo *K*α radiationμ = 6.81 mm^−1^*T* = 90 K0.18 × 0.12 × 0.08 mm

### Data collection {#sec2.1.2}

Bruker APEX CCD diffractometerAbsorption correction: multi-scan (*SADABS*; Bruker, 1998[@bb7]) *T* ~min~ = 0.374, *T* ~max~ = 0.61214513 measured reflections3623 independent reflections3171 reflections with *I* \> 2σ(*I*)*R* ~int~ = 0.052

### Refinement {#sec2.1.3}

*R*\[*F* ^2^ \> 2σ(*F* ^2^)\] = 0.074*wR*(*F* ^2^) = 0.147*S* = 1.383623 reflections181 parametersH-atom parameters constrainedΔρ~max~ = 1.38 e Å^−3^Δρ~min~ = −0.85 e Å^−3^

 {#d5e459}

Data collection: *SMART* (Bruker, 1998[@bb7]); cell refinement: *SAINT* (Bruker, 1998[@bb7]); data reduction: *SAINT*; program(s) used to solve structure: *SHELXS97* (Sheldrick, 2008[@bb11]); program(s) used to refine structure: *SHELXL97* (Sheldrick, 2008[@bb11]); molecular graphics: *DIAMOND* (Brandenburg & Putz, 1999[@bb6]); software used to prepare material for publication: *SHELXTL* (Sheldrick, 2008[@bb11]).

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

Crystal structure: contains datablocks I, global. DOI: [10.1107/S1600536810034537/lh5106sup1.cif](http://dx.doi.org/10.1107/S1600536810034537/lh5106sup1.cif)

Structure factors: contains datablocks I. DOI: [10.1107/S1600536810034537/lh5106Isup2.hkl](http://dx.doi.org/10.1107/S1600536810034537/lh5106Isup2.hkl)

Additional supplementary materials: [crystallographic information](http://scripts.iucr.org/cgi-bin/sendsupfiles?lh5106&file=lh5106sup0.html&mime=text/html); [3D view](http://scripts.iucr.org/cgi-bin/sendcif?lh5106sup1&Qmime=cif); [checkCIF report](http://scripts.iucr.org/cgi-bin/paper?lh5106&checkcif=yes)

Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: [LH5106](http://scripts.iucr.org/cgi-bin/sendsup?lh5106)).

This work was supported by funding from Syracuse University.

Comment
=======

The described ligand *N^1^*,*N^1^*,*N^4^*,*N^4^*-tetrakis(pyridin-2-ylmethyl)butane-1,4-diamine has been used as starting material for hydrothermal synthesis of metal-organic transition metal/molybdateoxide frameworks in the principal author\'s laboratory (Bartholomä, unpublished results). The dipicolylamine moiety has originally been used in our laboratory as metal chelating entity for binding of the *M*(CO)~3~ core (*M* = Re,^99^*^m^*Tc) for radiopharmaceutical purposes. A different coordination mode has been observed for the *M*(CO)~3~ core in which the dipicolylamine metal chelate is coordinated in a facial manner (Bartholomä, 2009).

The title complex was prepared as part of a series with different cadmium and copper salts to study the coordination properties of the ligand with these metals without the interaction of metaloxide clusters (Bartholomä, 2010*a*,b,c). The crystalline sample obtained with copper chloride as metal source and *N^1^*,*N^1^*,*N^5^*,*N^5^*-tetrakis(pyridin-2-ylmethyl)pentane-1,5-diamine gave a structurally similar compound with a distorted square pyramidal coordination geometry of the copper atoms as observed for the described complex. The Cu---N~py~ distances of 1.986 (4) Å and 1.996 (4), and a Cu---N*~tert~* distance of 2.076 (4) Å (Bartholomä, 2010d).

Crystal structures of the ligands *N^1^*,*N^1^*,*N^3^*,*N^3^*-tetrakis(2-pyridiniomethyl)-1,3-diaminopropane and *N^1^*,*N^1^*,*N^4^*,*N^4^*-tetrakis(pyridin-2-ylmethyl)butane-1,4-diamine have been described recently (Fujihara, 2004; Mambanda, 2007). Superoxide dismutase activity of iron(II) complexes of *N^1^*,*N^1^*,*N^3^*,*N^3^*-tetrakis(2-pyridiniomethyl)-1,3-diaminopropane and related ligands has been investigated by Tamura *et al.* (2000). Studies on the thermodynamic and kinetic behaviour of the reaction of platinum(II) complexes of higher ligand homologues with chloride have been performed by Ertürk *et al.* (2007).

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

*N^1^*,*N^1^*,*N^4^*,*N^4^*-tetrakis(pyridin-2-ylmethyl)butane-1,4-diamine. An amount of 1.00 g (11.34 mmol) 1,4-diaminobutane was dissolved in 30 ml anhydrous dichloroethane under an inert atmosphere (argon) followed by the addition of 4.55 ml (47.65 mmol) pyridine-2-carboxaldehyde. The mixture was stirred for 15 min at r.t. and then cooled with an ice bath prior to the portionwise addition of 14.43 g (68.06 mmol) sodium triacetoxyborohydride (gas evolution, exothermic reaction). The reaction was stirred overnight allowing the temperature slowly to rise to room temperature. The reaction was quenched by the dropwise addition of saturated sodium bicarbonate solution and stirring was continued until the gas evolution ceased. The mixture was separated and the organic layer was further washed with saturated sodium bicarbonate solution, water and brine. The organic phase was dried with anhydrous sodium sulfate, filtered and the solvent removed under reduced pressure. The crude reaction mixture was then purified by silica gel column chromatography starting with chloroform and increasing gradient to chloroform:methanol 10:1 (*v*/*v*). Yield: 4.02 g (78%). ^1^H NMR (CDCl~3~): *δ* = 8.40 (m, 4H), 7.51 (m, 4H), 7.39 (d, J = 7.81 Hz, 4H), 7.02 (m, 4H), 3.67 (s, 8H), 2.39 (m, 4H), 1.42 (m, 4H) p.p.m..

Synthesis of metal complex. To 2 ml of an aqueous solution of copper bromide, two equivalents (50 mg, 0.11 mmol) of *N^1^*,*N^1^*,*N^4^*,*N^4^*-tetrakis(pyridin-2-ylmethyl)butane-1,4-diamine in 2 ml methanol were added followed by the addition of 2 ml *N*,*N*-dimethylformamide. Single crystals were obtained after a week by slow evaporation of the solvents at room temperature.

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

All the H atoms were placed in idealized positions and refined in a riding-model approximation with *C*---H~aryl~ = 0.95 Å, *C*---H~methyl~ = 0.98Å and *C*---H~methylene~ = 0.99Å and *U*~iso~(H) = 1.5*U*~eq~(C~methyl~) and 1.2*U*~eq~(C~methylene/aryl~).

Figures
=======

![The crystal structure of the title complex. The displacement ellipsoids are drawn at 50% probability level. Hydrogen atoms are omitted for clarity. Unlabeled atoms are related by the symmetry code (-x + 1, -y + 1, -z + 1).](e-66-m1198-fig1){#Fap1}

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

  -------------------------------- ---------------------------------------
  \[Cu~2~Br~4~(C~28~H~32~N~6~)\]   *F*(000) = 880
  *M~r~* = 899.32                  *D*~x~ = 2.002 Mg m^−3^
  Monoclinic, *P*2~1~/*n*          Mo *K*α radiation, λ = 0.71073 Å
  Hall symbol: -P 2yn              Cell parameters from 2666 reflections
  *a* = 8.8613 (6) Å               θ = 2.7--27.2°
  *b* = 14.249 (1) Å               µ = 6.81 mm^−1^
  *c* = 11.9488 (9) Å              *T* = 90 K
  β = 98.588 (2)°                  Plates, green
  *V* = 1491.80 (18) Å^3^          0.18 × 0.12 × 0.08 mm
  *Z* = 2                          
  -------------------------------- ---------------------------------------

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

  ------------------------------------------------------------ --------------------------------------
  Bruker APEX CCD diffractometer                               3623 independent reflections
  Radiation source: fine-focus sealed tube                     3171 reflections with *I* \> 2σ(*I*)
  graphite                                                     *R*~int~ = 0.052
  Detector resolution: 512 pixels mm^-1^                       θ~max~ = 28.1°, θ~min~ = 2.2°
  φ and ω scans                                                *h* = −10→11
  Absorption correction: multi-scan (*SADABS*; Bruker, 1998)   *k* = −18→18
  *T*~min~ = 0.374, *T*~max~ = 0.612                           *l* = −15→15
  14513 measured reflections                                   
  ------------------------------------------------------------ --------------------------------------

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

  ------------------------------------- -------------------------------------------------------------------------------------------------
  Refinement on *F*^2^                  Primary atom site location: structure-invariant direct methods
  Least-squares matrix: full            Secondary atom site location: difference Fourier map
  *R*\[*F*^2^ \> 2σ(*F*^2^)\] = 0.074   Hydrogen site location: inferred from neighbouring sites
  *wR*(*F*^2^) = 0.147                  H-atom parameters constrained
  *S* = 1.38                            *w* = 1/\[σ^2^(*F*~o~^2^) + (0.042*P*)^2^ + 10.8322*P*\] where *P* = (*F*~o~^2^ + 2*F*~c~^2^)/3
  3623 reflections                      (Δ/σ)~max~ = 0.001
  181 parameters                        Δρ~max~ = 1.38 e Å^−3^
  0 restraints                          Δρ~min~ = −0.85 e Å^−3^
  ------------------------------------- -------------------------------------------------------------------------------------------------

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~   
  Cu1    0.35669 (10)   0.75522 (6)   0.35899 (7)   0.0111 (2)           
  Br1    0.21437 (9)    0.82045 (5)   0.15805 (6)   0.01711 (19)         
  Br2    0.29274 (9)    0.87831 (5)   0.48204 (6)   0.01847 (19)         
  N1     0.4360 (6)     0.6374 (4)    0.2878 (5)    0.0087 (11)          
  N2     0.1789 (7)     0.6693 (4)    0.3702 (5)    0.0101 (11)          
  N3     0.5695 (6)     0.8000 (4)    0.3456 (5)    0.0099 (11)          
  C1     0.2983 (8)     0.5899 (5)    0.2279 (6)    0.0138 (14)          
  H1A    0.3214         0.5230        0.2157        0.017\*              
  H1B    0.2676         0.6195        0.1530        0.017\*              
  C2     0.1707 (8)     0.5972 (5)    0.2964 (6)    0.0118 (13)          
  C3     0.0522 (8)     0.5333 (5)    0.2869 (6)    0.0161 (15)          
  H3     0.0470         0.4837        0.2334        0.019\*              
  C4     −0.0587 (9)    0.5423 (5)    0.3564 (7)    0.0208 (16)          
  H4     −0.1415        0.4994        0.3507        0.025\*              
  C5     −0.0474 (9)    0.6153 (6)    0.4350 (7)    0.0214 (16)          
  H5     −0.1201        0.6219        0.4854        0.026\*              
  C6     0.0718 (8)     0.6775 (5)    0.4377 (6)    0.0159 (14)          
  H6     0.0784         0.7284        0.4896        0.019\*              
  C7     0.5359 (8)     0.6749 (5)    0.2094 (6)    0.0136 (14)          
  H7A    0.4729         0.7002        0.1406        0.016\*              
  H7B    0.6010         0.6242        0.1863        0.016\*              
  C8     0.6340 (8)     0.7514 (5)    0.2682 (6)    0.0132 (14)          
  C9     0.7788 (9)     0.7733 (5)    0.2435 (6)    0.0169 (15)          
  H9     0.8206         0.7398        0.1866        0.020\*              
  C10    0.8606 (8)     0.8445 (5)    0.3033 (6)    0.0167 (15)          
  H10    0.9603         0.8600        0.2890        0.020\*              
  C11    0.7950 (9)     0.8930 (5)    0.3845 (6)    0.0186 (15)          
  H11    0.8492         0.9421        0.4267        0.022\*              
  C12    0.6489 (9)     0.8689 (5)    0.4032 (6)    0.0147 (14)          
  H12    0.6041         0.9024        0.4587        0.018\*              
  C13    0.5282 (8)     0.5732 (5)    0.3704 (6)    0.0111 (13)          
  H13A   0.6209         0.6073        0.4052        0.013\*              
  H13B   0.5620         0.5193        0.3281        0.013\*              
  C14    0.4471 (7)     0.5353 (4)    0.4650 (5)    0.0096 (13)          
  H14A   0.3506         0.5042        0.4323        0.011\*              
  H14B   0.4224         0.5875        0.5139        0.011\*              
  ------ -------------- ------------- ------------- -------------------- --

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

  ----- ------------ ------------ ------------ ------------- ------------ -------------
        *U*^11^      *U*^22^      *U*^33^      *U*^12^       *U*^13^      *U*^23^
  Cu1   0.0124 (4)   0.0090 (4)   0.0126 (4)   0.0003 (3)    0.0041 (3)   −0.0005 (3)
  Br1   0.0196 (4)   0.0162 (4)   0.0155 (3)   0.0032 (3)    0.0024 (3)   0.0062 (3)
  Br2   0.0249 (4)   0.0131 (3)   0.0198 (4)   −0.0001 (3)   0.0110 (3)   −0.0037 (3)
  N1    0.009 (3)    0.008 (3)    0.011 (3)    −0.002 (2)    0.004 (2)    0.000 (2)
  N2    0.014 (3)    0.009 (3)    0.008 (2)    −0.002 (2)    0.003 (2)    0.003 (2)
  N3    0.010 (3)    0.009 (3)    0.011 (3)    0.002 (2)     0.003 (2)    0.004 (2)
  C1    0.018 (4)    0.012 (3)    0.012 (3)    −0.003 (3)    0.003 (3)    −0.006 (3)
  C2    0.013 (3)    0.010 (3)    0.011 (3)    0.003 (3)     −0.003 (3)   0.005 (2)
  C3    0.017 (4)    0.010 (3)    0.018 (3)    −0.002 (3)    −0.006 (3)   −0.002 (3)
  C4    0.013 (4)    0.019 (4)    0.032 (4)    −0.002 (3)    0.005 (3)    0.005 (3)
  C5    0.014 (4)    0.027 (4)    0.025 (4)    0.001 (3)     0.007 (3)    0.009 (3)
  C6    0.014 (4)    0.018 (4)    0.015 (3)    0.003 (3)     0.003 (3)    0.001 (3)
  C7    0.014 (4)    0.016 (3)    0.013 (3)    0.001 (3)     0.009 (3)    −0.004 (3)
  C8    0.019 (4)    0.011 (3)    0.010 (3)    −0.001 (3)    0.003 (3)    0.005 (3)
  C9    0.018 (4)    0.019 (4)    0.016 (3)    0.003 (3)     0.007 (3)    0.005 (3)
  C10   0.011 (3)    0.015 (3)    0.024 (4)    −0.004 (3)    0.002 (3)    0.009 (3)
  C11   0.019 (4)    0.015 (3)    0.020 (4)    −0.001 (3)    −0.002 (3)   0.001 (3)
  C12   0.021 (4)    0.008 (3)    0.016 (3)    0.002 (3)     0.003 (3)    0.007 (3)
  C13   0.010 (3)    0.010 (3)    0.015 (3)    0.002 (3)     0.005 (3)    0.004 (2)
  C14   0.007 (3)    0.008 (3)    0.013 (3)    0.000 (2)     0.001 (2)    0.005 (2)
  ----- ------------ ------------ ------------ ------------- ------------ -------------

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

  ---------------------- ------------- ------------------------- ------------
  Cu1---N2               2.015 (6)     C5---C6                   1.375 (11)
  Cu1---N3               2.019 (6)     C5---H5                   0.9500
  Cu1---N1               2.053 (5)     C6---H6                   0.9500
  Cu1---Br2              2.4099 (11)   C7---C8                   1.502 (10)
  Cu1---Br1              2.7045 (11)   C7---H7A                  0.9900
  N1---C7                1.482 (8)     C7---H7B                  0.9900
  N1---C1                1.482 (9)     C8---C9                   1.394 (10)
  N1---C13               1.495 (8)     C9---C10                  1.382 (11)
  N2---C6                1.340 (9)     C9---H9                   0.9500
  N2---C2                1.349 (9)     C10---C11                 1.388 (11)
  N3---C12               1.337 (9)     C10---H10                 0.9500
  N3---C8                1.349 (9)     C11---C12                 1.389 (11)
  C1---C2                1.496 (10)    C11---H11                 0.9500
  C1---H1A               0.9900        C12---H12                 0.9500
  C1---H1B               0.9900        C13---C14                 1.526 (9)
  C2---C3                1.381 (10)    C13---H13A                0.9900
  C3---C4                1.384 (11)    C13---H13B                0.9900
  C3---H3                0.9500        C14---C14^i^              1.536 (12)
  C4---C5                1.395 (12)    C14---H14A                0.9900
  C4---H4                0.9500        C14---H14B                0.9900
                                                                 
  N2---Cu1---N3          161.0 (2)     C6---C5---H5              120.8
  N2---Cu1---N1          81.4 (2)      C4---C5---H5              120.8
  N3---Cu1---N1          81.0 (2)      N2---C6---C5              122.7 (7)
  N2---Cu1---Br2         98.29 (16)    N2---C6---H6              118.7
  N3---Cu1---Br2         97.22 (16)    C5---C6---H6              118.7
  N1---Cu1---Br2         166.96 (16)   N1---C7---C8              109.0 (5)
  N2---Cu1---Br1         90.12 (16)    N1---C7---H7A             109.9
  N3---Cu1---Br1         97.95 (15)    C8---C7---H7A             109.9
  N1---Cu1---Br1         93.22 (16)    N1---C7---H7B             109.9
  Br2---Cu1---Br1        99.82 (4)     C8---C7---H7B             109.9
  C7---N1---C1           112.7 (5)     H7A---C7---H7B            108.3
  C7---N1---C13          108.6 (5)     N3---C8---C9              121.9 (7)
  C1---N1---C13          111.7 (5)     N3---C8---C7              114.7 (6)
  C7---N1---Cu1          103.9 (4)     C9---C8---C7              123.4 (6)
  C1---N1---Cu1          105.4 (4)     C10---C9---C8             118.9 (7)
  C13---N1---Cu1         114.4 (4)     C10---C9---H9             120.6
  C6---N2---C2           119.0 (6)     C8---C9---H9              120.6
  C6---N2---Cu1          128.2 (5)     C9---C10---C11            119.0 (7)
  C2---N2---Cu1          112.7 (4)     C9---C10---H10            120.5
  C12---N3---C8          119.0 (6)     C11---C10---H10           120.5
  C12---N3---Cu1         128.1 (5)     C10---C11---C12           119.2 (7)
  C8---N3---Cu1          112.9 (5)     C10---C11---H11           120.4
  N1---C1---C2           109.8 (5)     C12---C11---H11           120.4
  N1---C1---H1A          109.7         N3---C12---C11            122.0 (7)
  C2---C1---H1A          109.7         N3---C12---H12            119.0
  N1---C1---H1B          109.7         C11---C12---H12           119.0
  C2---C1---H1B          109.7         N1---C13---C14            115.7 (5)
  H1A---C1---H1B         108.2         N1---C13---H13A           108.4
  N2---C2---C3           121.5 (7)     C14---C13---H13A          108.4
  N2---C2---C1           116.0 (6)     N1---C13---H13B           108.4
  C3---C2---C1           122.5 (6)     C14---C13---H13B          108.4
  C2---C3---C4           119.2 (7)     H13A---C13---H13B         107.4
  C2---C3---H3           120.4         C13---C14---C14^i^        108.6 (7)
  C4---C3---H3           120.4         C13---C14---H14A          110.0
  C3---C4---C5           119.2 (7)     C14^i^---C14---H14A       110.0
  C3---C4---H4           120.4         C13---C14---H14B          110.0
  C5---C4---H4           120.4         C14^i^---C14---H14B       110.0
  C6---C5---C4           118.3 (7)     H14A---C14---H14B         108.3
                                                                 
  N2---Cu1---N1---C7     151.6 (4)     Cu1---N2---C2---C3        −176.6 (5)
  N3---Cu1---N1---C7     −35.6 (4)     C6---N2---C2---C1         −177.1 (6)
  Br2---Cu1---N1---C7    −118.9 (7)    Cu1---N2---C2---C1        4.5 (7)
  Br1---Cu1---N1---C7    62.0 (4)      N1---C1---C2---N2         24.0 (8)
  N2---Cu1---N1---C1     32.9 (4)      N1---C1---C2---C3         −154.9 (6)
  N3---Cu1---N1---C1     −154.3 (4)    N2---C2---C3---C4         −1.4 (10)
  Br2---Cu1---N1---C1    122.4 (7)     C1---C2---C3---C4         177.4 (7)
  Br1---Cu1---N1---C1    −56.7 (4)     C2---C3---C4---C5         −0.5 (11)
  N2---Cu1---N1---C13    −90.2 (4)     C3---C4---C5---C6         2.1 (11)
  N3---Cu1---N1---C13    82.6 (4)      C2---N2---C6---C5         −0.2 (10)
  Br2---Cu1---N1---C13   −0.7 (10)     Cu1---N2---C6---C5        178.0 (5)
  Br1---Cu1---N1---C13   −179.8 (4)    C4---C5---C6---N2         −1.7 (11)
  N3---Cu1---N2---C6     137.8 (7)     C1---N1---C7---C8         158.0 (6)
  N1---Cu1---N2---C6     160.1 (6)     C13---N1---C7---C8        −77.8 (7)
  Br2---Cu1---N2---C6    −6.7 (6)      Cu1---N1---C7---C8        44.4 (6)
  Br1---Cu1---N2---C6    −106.7 (6)    C12---N3---C8---C9        −2.4 (10)
  N3---Cu1---N2---C2     −44.0 (9)     Cu1---N3---C8---C9        177.9 (5)
  N1---Cu1---N2---C2     −21.7 (4)     C12---N3---C8---C7        179.3 (6)
  Br2---Cu1---N2---C2    171.5 (4)     Cu1---N3---C8---C7        −0.3 (7)
  Br1---Cu1---N2---C2    71.6 (4)      N1---C7---C8---N3         −30.7 (8)
  N2---Cu1---N3---C12    −136.2 (7)    N1---C7---C8---C9         151.1 (6)
  N1---Cu1---N3---C12    −158.5 (6)    N3---C8---C9---C10        2.5 (10)
  Br2---Cu1---N3---C12   8.4 (6)       C7---C8---C9---C10        −179.4 (7)
  Br1---Cu1---N3---C12   109.4 (5)     C8---C9---C10---C11       −1.1 (10)
  N2---Cu1---N3---C8     43.4 (9)      C9---C10---C11---C12      −0.2 (10)
  N1---Cu1---N3---C8     21.0 (4)      C8---N3---C12---C11       1.1 (10)
  Br2---Cu1---N3---C8    −172.0 (4)    Cu1---N3---C12---C11      −179.4 (5)
  Br1---Cu1---N3---C8    −71.0 (4)     C10---C11---C12---N3      0.2 (10)
  C7---N1---C1---C2      −151.4 (6)    C7---N1---C13---C14       174.3 (6)
  C13---N1---C1---C2     86.1 (7)      C1---N1---C13---C14       −60.8 (7)
  Cu1---N1---C1---C2     −38.8 (6)     Cu1---N1---C13---C14      58.8 (7)
  C6---N2---C2---C3      1.8 (10)      N1---C13---C14---C14^i^   175.1 (6)
  ---------------------- ------------- ------------------------- ------------

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

###### Selected bond lengths (Å)

  ----------- -------------
  Cu1---N2    2.015 (6)
  Cu1---N3    2.019 (6)
  Cu1---N1    2.053 (5)
  Cu1---Br2   2.4099 (11)
  Cu1---Br1   2.7045 (11)
  ----------- -------------

[^1]: Current address: Harvard Medical School, Children's Hospital Boston, Department of Radiology, 300 Longwood Ave, Enders 4, Boston, MA 02115, USA.
