Synthesis and Crystal Structure of Diaquabis(4-iodinebenzoato-κO)bis-(nicotinamide-κN)cobalt(II)

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The title compound [Co(C₇H₄O₂I)₂(C₁₀H₁₄N₂O)₂(H₂O)₂] is a two-dimensional hydrogen-bonded supramolecular complex. The complex crystallizes in the triclinic space group P1 with unit-cell parameters a = 7.2964(13), b = 8.6047(17), c = 16.745(3)Å, α = 93.034(15), β = 101.574(15), γ = 111.975(14)° and Z = 1. The Co(II) ion resides on a centre of symmetry, and is in an octahedral coordination environment comprising two pyridyl N atoms, two carboxylate O atoms and two O atoms from water molecules. Intermolecular C-H…O and O-H…O hydrogen bonds produce R₂²(16), R₂²(18) and R₂²(20) rings, which lead to one-dimensional polymeric chains. An extensive two-dimensional network of C-H…O and O-H…O hydrogen bonds, π-π and C-H…π interactions are responsible for crystal stabilization.