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Issue 6, 2012
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The synthesis and photophysical studies of cyclometalated Pt(ii) complexes with C,N,N-ligands containing imidazolyl donors

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Abstract

Two new C,N,N-type ligands (HL2 and HL3), containing a Cphenyl, a Npyridyl, and a Nimidazolyl donor, and their cycloplatinated complexes, [Pt(L2)Cl] (1), [Pt(L3)Cl] (2), [Pt(L2)(PPh3)]+ (3) and [Pt(L3)(PPh3)]+ (4), have been successfully synthesized and characterized. Spectroscopic and 3MLCT luminescent properties of these Pt(II) cyclometalated complexes were found to be pH dependent. This was attributed to the protonation/deprotonation of the acidic 1-imidazolyl-NH moieties on the ligands. All the cycloplatinated complexes (both protonated and deprotonated forms) possessed two-photon excitability with two-photon absorption cross-sections ranging from 6.0 to 30.0 GM (protonated forms) and from 16.2 to 24.9 GM (deprotonated forms).

Graphical abstract: The synthesis and photophysical studies of cyclometalated Pt(ii) complexes with C,N,N-ligands containing imidazolyl donors

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Article information


Submitted
03 Jun 2011
Accepted
04 Nov 2011
First published
13 Dec 2011

Dalton Trans., 2012,41, 1792-1800
Article type
Paper

The synthesis and photophysical studies of cyclometalated Pt(II) complexes with C,N,N-ligands containing imidazolyl donors

Y. Ho, C. Koo, K. Wong, H. Kong, C. T. Chan, W. Kwok, C. Chow, M. H. Lam and W. Wong, Dalton Trans., 2012, 41, 1792
DOI: 10.1039/C1DT11037C

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