Abstract
Hydrothermal reaction of copper(II) nitrate trihydrate with 2-pyrazinecarboxylic acid in the presence of phosphorous acid gave a novel mixed-valence coordination polymer, [Cu(I)Cu(II)(C5H3N2O2)2(NO3)(H2O)] n (1), which has been structurally characterized. Crystal data: triclinic, P , a = 6.2266(6), b = 8.0148(7), c = 14.443(1) Å, α = 74.698(1), β = 84.865(1), γ = 84.532(1)°, V = 690.51(11) Å3, Z = 2, R 1 = 0.0262. The complex features linear –Cu(1)(2-pyrazinecarboxylate)–Cu(2)–(NO3)(H2O)(2-pyrazinecarboxylate)–Cu(3) (2-pyrazinecarboxylate)–Cu(2)(NO3)(H2O)(2-pyrazinecarboxylate)– strands cross-linked by water molecules to form a two-dimensional sheet, further connected by intralayer Cu(2) ··· interactions to form a novel cavity. Other characteristic data are given.
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