Synthesis, spectroscopic and X-ray structural study of [trans-di(4-aminobenzoato)bis(ethylenediamine) cobalt(III)] 4-aminobenzoate tetrahydrate

Research paper by Raj Pal Sharma, Rajni Sharma, Ritu Bala, Paloth Venugopalan

Indexed on: 01 Jan '05Published on: 01 Jan '05Published in: Journal of chemical crystallography


The title compound was synthesized by mixing the separately dissolved trans-dichlorobis(ethylenediamine)cobalt(III) chloride and sodium 4-aminobenzoate in aqueous medium in 1:3 molar ratio and recrystallizing the product obtained, from hot water. Elemental analyses and spectroscopic techniques (IR, UV/visible, 1H and 13C NMR) were used for characterizing the complex salt. X-ray structure determination revealed an ionic structure consisting of [Co(en)2(C7H6NO2)2]+ cation, (C7H6NO2)− anion and four lattice water molecules. The complex salt crystallizes in the triclinic space group P\( {\rm \bar 1} \) with cell dimensions a = 9.985(1) Å, b = 11.522(1) Å, c = 14.233(1) Å, α = 80.20(1)∘, β = 72.80(1)∘, γ = 86.43(1)∘, Z = 2, V = 1541.3(2) Å3, R1 = 0.0291, and wR2 = 0.0751.