Iridium(III) complexes with polypyridine ligands coordinated as N-heterocyclic carbenes. Synthesis, structure and photophysical properties

Salvador Conejero; Celia Maya; Margarita Paneque; Ana Petronilho; Manuel L. Poveda; Florencia Vattier; Eleuterio Álvarez; Ernesto Carmona; Antonio Laguna; Olga Crespo

doi:10.1039/C2DT31754K

Iridium(iii) complexes with polypyridine ligands coordinated as N-heterocyclic carbenes. Synthesis, structure and photophysical properties†‡

Salvador Conejero,^a Celia Maya,^a Margarita Paneque,^a Ana Petronilho,^a Manuel L. Poveda,*^a Florencia Vattier,^a Eleuterio Álvarez,^a Ernesto Carmona,*^a Antonio Laguna*^b and Olga Crespo^b

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^a Instituto de Investigaciones Químicas (IIQ), Departamento de Química Inorgánica, CSIC and Universidad de Sevilla, Avda. Américo Vespucio 49, Isla de la Cartuja, Sevilla, Spain
E-mail: guzman@us.es
Fax: +34 954460565
Tel: +34 954489558

^b Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH). Universidad de Zaragoza-CSIC, Pedro Cerbuna 12, Zaragoza, Spain
E-mail: alaguna@unizar.es

Abstract

Unsaturated [Tp^Me2Ir(III)] fragments, readily generated from compounds [Tp^Me2Ir(C₆H₅)₂(N₂)], (1a) and [Tp^Me2Ir(η⁴-CH₂ [double bond, length as m-dash] C(Me)C(Me)CH₂] (1b) (Tp^Me2 = hydrotris(3,5-dimethylpyrazolyl)borate), induce the isomerisation of the polypyridines, 2,2′-bipyridine, 1,10-phenanthroline and 2,2′:6′2′′-terpyridine, to form complexes that contain the carbene tautomer of these ligands. For terpy, a binuclear compound has also been isolated, in which this molecule bridges two Ir(III) centres, thanks to its coordination as a bidentate N-heterocyclic carbene. The new compounds have been structurally authenticated by X-ray crystallography and their photophysical properties have been investigated.

This article is part of the themed collection: In Celebration of David Cole-Hamilton's Career in Chemistry

Dalton Transactions

Iridium(iii) complexes with polypyridine ligands coordinated as N-heterocyclic carbenes. Synthesis, structure and photophysical properties†‡

Abstract

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Iridium(III) complexes with polypyridine ligands coordinated as N-heterocyclic carbenes. Synthesis, structure and photophysical properties

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