Extended structures constructed from alkoxo-bridged binuclear complexes as nodes and bis(4-pyridyl) ethylene as a spacer

Marin G, Tudor V, Kravtsov VC, et al. Extended structures constructed from alkoxo-bridged binuclear complexes as nodes and bis(4-pyridyl) ethylene as a spacer. CRYSTAL GROWTH & DESIGN. 2005;5(1):279-282.Two new polynuclear complexes have been obtained by connecting alkoxo-bridged binuclear copper(II) complexes with bis(4-pyridyl)ethylene (bpe): [Cu-2(Hdea)(2)(bpe)]-(bpe)-(ClO4)(2) (1) and [Cu-2(mea)(2)(bpe)(2)](ClO4)(2) (2) (Hdea = mono-deprotonated diethanolamine and mea = deprotonated monoethanolamine). The structure of 1 consists of infinite chains that have resulted by connecting the bis(alkoxo)-bridged centrosymmetrical [Cu-2(dea)(2)](2+) nodes with bis(4-pyridyl)ethylene rods. The (CuCu)-Cu-... separations within the chain are 2.984 and 13.308 Angstrom. The noncoordinated bpe molecules bind the parallel coordination polymer chains through hydrogen bond interactions, resulting in infinite gridlike sheets. Compound 2 exhibits an interlocked 3-D structure, resulting from the inclined interpenetration of 2-D gridlike sheets. Each sheet is constructed from [Cu-2(mea)(2)] nodes, interconnected by bpe spacers. Every mesh of every sheet contains parts of two others passing through it. The distance between the alkoxo-bridged copper(II) ions within the nodes is 3.020 Angstrom, while the distances between the copper ions bridged by bpe ligands are 13.381 and 14.051 Angstrom