Issue 1, 2016

Synthesis and cation-binding studies of gold(i) complexes bearing oligoether isocyanide ligands with ester and amide as linkers

Abstract

A series of dinuclear gold(I) isocyanide complexes of bis(alkynyl)calix[4]arene was designed and synthesized, and their photophysical and cation recognition properties were studied. Complex 1, [{calix[4]arene-(OCH2CONH-C6H4C[triple bond, length as m-dash]C)2}{Au(CN-C6H4O(CH2CH2O)2CH3)}2], was found to show a high selectivity towards Al3+ in CH2Cl2–MeCN (1 : 1 v/v). Upon addition of Al3+, drastic changes in the electronic absorption, emission and 1H NMR spectra were observed. These changes have been attributed to the formation of Au(I)⋯Au(I) interactions induced by the high binding affinity of the amide site for the Al3+ ion, instead of the high binding affinity expected of the oligoether site for alkali and alkaline earth metal ions. Further studies with the control complex, [{calix[4]arene-(OOC-C6H4C[triple bond, length as m-dash]C)2}{Au(CN-C6H4O(CH2CH2O)2CH3)}2] (4), indicated that the amide carbonyl oxygen in the flexible pendants is crucial for the binding of Al3+.

Graphical abstract: Synthesis and cation-binding studies of gold(i) complexes bearing oligoether isocyanide ligands with ester and amide as linkers

Article information

Article type
Paper
Submitted
27 Aug. 2015
Accepted
10 Nov. 2015
First published
25 Nov. 2015

Dalton Trans., 2016,45, 300-306

Synthesis and cation-binding studies of gold(I) complexes bearing oligoether isocyanide ligands with ester and amide as linkers

F. K. Hau and V. W. Yam, Dalton Trans., 2016, 45, 300 DOI: 10.1039/C5DT03321G

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