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DOI: 10.1039/A808550A (Paper) Reference Section for: J. Chem. Soc., Dalton Trans., 1999, 729-734

The influence of the linkage mode between bipyridine units in oligobipyridine ligands on the formation of copper-(I) and -(II) helicates

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Mou-Hai Shu, Wei-Yin Sun, Chun-Ying Duan, You-Jun Fu, Wen-Jian Zhang and Wen-Xia Tang

Abstract

A novel asymmetric oligobipyridine ligand, 1-(5′-methyl-2,2′-bipyridin-5-yl)-2-(6′-methyl-2,2′-bipyridin-6-yl)ethane (L56), was synthesized, and double-stranded helical complexes [CuI2L562][ClO4]2·Et2O 1 and [CuII2L562(OH)(H2O)][ClO4]3 2 were obtained by reaction of the ligand with copper-(I) and -(II) ions, respectively. X-Ray data for 1 show that the two ligands intertwine around the two copper(I) ions with distorted tetrahedral geometry. The distance between the two Cu(I) ions is 7.290(2) Å. The copper(II) ions in 2 have a disordered tetragonal pyramidal geometry with a N4O donor set. The intermetallic distance is 6.875(2) Å. In both 1 and 2 the two ligand strands are arranged in a head-to-tail configuration. The complexes were also characterized by ES-MS, 1H NMR and ESR spectroscopies. The results show that the difference in linkage of the spacer group to the bipyridine units produces a great impact on the helix formation with CuII.

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