A new packing variant of catena-poly[[aquachlorocopper(II)]-mu-pyrazine-2-carboxylato-O,N:N'].
Single crystals of the title coordination polymer, [CuCl(C5H3N2O2)(H2O)], have been prepared by hydrothermal synthesis. The compound is composed of infinite one-dimensional chains of pseudo-square-pyramidal Cu(II) ions connected via pyrazine-2-carboxylate ligands. A network of O-H...O hydrogen bonding between adjacent chains is responsible for a bilayer structure different from the previously reported polymorph.
Synthesis and structural characterization of 2-pyrazinecarboxylate zinc compound {[Zn2(Pyz)2(H2O)4] · SO4}n (Pyz = 2-pyrazinic acid)
A solvothermal reaction of 2-pyrazinic acid with Zn(SO4)2 · 7H2O yielded the title complex of the formula {[Zn2(Pyz)2(H2O)4] · SO4}n (I). X-ray diffraction study shows that the complex I crystallizes in mono-clinic system, space group P21/c, with lattice parameters a = 11.2687(6), b = 7.3511(4), c = 11.8506(7) Å, β = 95.070(2)°, V = 977.83(9) Å3, Z = 4, and ρcalcd = 2.184 mg m−3.
COPPER(II) AND COBALT(II) COMPLEXES OF PYRIDINE-2-CARBOXAMIDE AND PYRIDINE-2-CARBOXYLIC ACID
Abstract The formation constants of the following have been measured with a polarographic method: binary copper(II) complexes of pyridine-2-carboxamide (picolinamide) and pyridine-2-carboxylic acid (picolinic acid), a ternary copper(II) complex of picolinic acid and imidazole, and a binary copper(I)-imidazole complex. The larger formation constant for picolinic acid over picolinamide is ascribed to the greater chelating ability of a carboxylate group over an amide carbonyl oxygen. The crystal and molecular structure of diaquobis(picolinato)cobalt(II) dihydrate, [Co(H2O)2(pc)2].2H2O, has been determined from three-dimensional MoKα X-ray collected by the multiple-film Weissenberg method. The unit cell dimensions are: a=9.89 ± 0.02 A, b=5.17 ± 0.01 A, c=17.50 ± 0.06 A, β=123.8 ± 0.4°. The space group is P21/c, and the calculated density is 1.67 g cm−3 with two formula weights per cell. The measured density is 1.67 g cm−3. The structure was solved by the Patterson method and refined by a least-squares method....