A mixed-valence chair-like tetranuclear copper(I,II) cluster with three linking modes of the
Quan Guo Zhai1, Shu Ni Li, Yu Cheng Jiang
1Key Laboratory of Macromolecular Science of Shaanxi Province, School of Chemistry and Materials Science, Shaanxi Normal University, Xi'an, Shaanxi 710062, People's Republic of China.
Abstract:
In the tetranuclear copper complex tetrakis[mu-3,5-bis(2-pyridyl)-1,2,4-triazolido]bis[3,5-bis(2-pyridyl)-1,2,4-triazolido]dicopper(I)dicopper(II) dihydrate, [Cu(I)(2)Cu(II)(2)(C(12)H(8)N(5))(6)].2H(2)O, the asymmetric unit is composed of one Cu(I) center, one Cu(II) center, three anionic 3,5-bis(2-pyridyl)-1,2,4-triazole (2-BPT) ligands and one solvent water molecule. The Cu(I) and Cu(II) centers exhibit [Cu(I)N(4)] tetrahedral and [Cu(II)N(6)] octahedral coordination environments, respectively. The three independent 2-BPT ligands adopt different chelating modes, which link the copper centers to generate a chair-like tetranuclear metallomacrocycle with metal-metal distances of about 4.4 x 6.2 A disposed about a crystallographic inversion center. Furthermore, strong pi-pi stacking interactions and O-H...N hydrogen-bonding systems link the tetracopper clusters into a two-dimensional supramolecular network.
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