Issue 13, 2016

Platinum complexes bearing normal and mesoionic N-heterocyclic carbene based pincer ligands: syntheses, structures, and photo-functional attributes

Abstract

Platinum complexes featuring pyridine bis-N-heterocyclic-imidazol-2-ylidene/-mesoionic-triazol-5-ylidene donors as pincer ligands and chloro (–Cl), acetonitrile (–NCCH3) or cyano (–CN) groups as auxiliary ligands are prepared as highly strained organometallic phosphors. X-ray structures of four of these complexes confirm a distorted square planar geometry, where the pincer ligand and its mesityl wingtips occur in a twisted conformation to each other. Electrochemical and photophysical characterization have been carried out and the experimental results are interpreted with the aid of density functional theory calculations. Emission responses of complexes under exposure to different vapors and mechanical shear are reported. Notably, the platinum complex featuring pyridine bis-imidazol-2-ylidene and a weakly donating acetonitrile auxiliary ligand exhibited strong aquachromic and mechanochromic emission responses, showing color changes from sky blue to green or yellow-green.

Graphical abstract: Platinum complexes bearing normal and mesoionic N-heterocyclic carbene based pincer ligands: syntheses, structures, and photo-functional attributes

Supplementary files

Article information

Article type
Paper
Submitted
07 Dec 2015
Accepted
22 Feb 2016
First published
23 Feb 2016

Dalton Trans., 2016,45, 5848-5859

Author version available

Platinum complexes bearing normal and mesoionic N-heterocyclic carbene based pincer ligands: syntheses, structures, and photo-functional attributes

A. R. Naziruddin, C. Lee, W. Lin, B. Sun, K. Chao, A. H. H. Chang and W. Hwang, Dalton Trans., 2016, 45, 5848 DOI: 10.1039/C5DT04770F

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