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- Title
Anion receptors containing coordinatively unsaturated metal ions: copper(II) complexes with cyclam derivatives.
- Authors
Boiocchi, Massimo; Broglia, Arturo; Fabbrizzi, Luigi; Fusco, Nadia; Mangano, Carlo
- Abstract
The two coordinatively unsaturated complexes [Cu(cyclam)]2+ (cyclam: 1,4,8,11-tetraazacyclotetradecane, 1) and [Cu(Bn4cyclam)]2+ (Bn4cyclam: 1,4,8,11-tetrabenzyl-1,4,8,11-tetraazacyclotetradecane, 2) in an MeCN solution uptake an anion X− (halide, pseudohalide) to give square pyramidal ternary complexes, whose stability has been determined through spectrophotometric titration experiments. The formation of a five-cordinate complex is favored by the trans-I configuration of the [Cu(Bn4cyclam)]2+ receptor, but it is contrasted by the severe steric repulsions exerted by the benzyl substituents on the macrocyclic framework. No significant repulsive effects have been observed in anion binding to the [Cu(cyclam)]2+ receptor, exhibiting a trans-III configuration. The existence of a linear relationship between the magnitude of the red shift experienced by the d−d absorption band on anion binding and log K values is discussed.
- Subjects
COORDINATION compounds; METAL ions; METAL complexes; ANIONS; UNSATURATED compounds
- Publication
Canadian Journal of Chemistry, 2014, Vol 92, Issue 8, p794
- ISSN
0008-4042
- Publication type
Article
- DOI
10.1139/cjc-2014-0078