Stability and Lability of Dicopper Double‐Stranded Helicates in Solution
作者:
Riccardo F. Carina,
Alan F. Williams,
Claude Piguet,
期刊:
Helvetica Chimica Acta
(WILEY Available online 1998)
卷期:
Volume 81,
issue 3‐4
页码: 548-557
ISSN:0018-019X
年代: 1998
DOI:10.1002/hlca.19980810308
出版商: WILEY‐VCH Verlag GmbH
数据来源: WILEY
摘要:
AbstractStability constants have been measured for a series of ligands based on a 2,2′‐(pyridine‐2,6‐diyl)bis[1H‐benzimidazole] unit which forms dinuclear double‐stranded helical complexes with copper(I). Variation of different structural parameters confirms the importance of the coordinate bond, the stacking interactions, and the weakly bridging pyridine units observed by X‐ray crystallography. The stabilities of the complexes depend strongly on the solvent, and in MeCN, which is a good solvent for copper(I), the complexes are less stable and assemble in a stepwise manner. The interconversion of the enantiomers may be followed by1H‐NMR and takes place on a millisecond time scale around room temperature. The trends in lability are similar to those found for the stability o
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