Department of Chemistry
The synthesis and photophysical studies of cyclometalated Pt(II) complexes with C,N,N-ligands containing imidazolyl donors
Two new C,N,N-type ligands (HL 2 and HL 3), containing a C phenyl, a N pyridyl, and a N imidazolyl donor, and their cycloplatinated complexes, [Pt(L 2)Cl] (1), [Pt(L 3)Cl] (2), [Pt(L 2)(PPh 3)] + (3) and [Pt(L 3)(PPh 3)] + (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). © 2012 The Royal Society of Chemistry.
Source Publication Title
Royal Society of Chemistry
Link to Publisher's Edition
Ho, Yu-Man, Chi-Kin Koo, Ka-Leung Wong, Hoi-Kuan Kong, Chris Tsz-Leung Chan, Wai-Ming Kwok, Cheuk-Fai Chow, Michael Hon-Wah Lam, and Wai-Yeung Wong. "The synthesis and photophysical studies of cyclometalated Pt(II) complexes with C,N,N-ligands containing imidazolyl donors." Dalton Transactions 41.6 (2011): 1792-1800.