Interaction of free functional group with platinum(II) center in cyclometalated complexes: A structural and photophysical property investigation |
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| Authors: | Jun-Feng Zhang Wen-Fu Fu Han Xu |
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| Institution: | a College of Chemistry and Chemical Engineering, Yunnan Normal University, 650092 Kunming, PR China
b Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, 100190 Beijing, PR China |
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| Abstract: | A series of flexible multidentate ligands containing N,P-donor, 2-N-(diphenylphosphino)methyl]amino-pyridine (L1), 2-N-bi-(diphenylphosphino) methyl]amino-pyridine (L2), 2-N-(diphenylphosphino)methyl]amino-7-methyl-1,8-naphthyridine (L3) and 4-(N-diphenylphosphino)methyl]amino-pyridine) (L4) have been synthesized. The mono- and dinuclear cyclometalated platinum(II) complexes Pt(C^N^N)L1]ClO4 (HC^N^N = 6-phenyl-2,2′-bipyridine), Pt2(C^N^N)2L1](ClO4)2, Pt2(C^N^N)2L2](ClO4)2, Pt(C^N^N)L3]ClO4 and Pt2(C^N^N)2L4](ClO4)2 were prepared and their structures determined by X-ray crystal analysis. These complexes exhibit long-lived bright orange emissions ranging from 560 to 610 nm in the solid state at room temperature. In solution, dinuclear complexes have emissions with higher quantum yields than mononuclear complexes. This can be attributed to intramolecular interaction of free functional group with Pt(II) at axial position, resulting in the quenching of phosphorescence for platinum(II) complexes in the 3MLCT excited state. |
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| Keywords: | Cyclometalated Pt(II) complexes Flexible multidentate ligands Intramolecular interaction Phosphorescence Structures and photophysical properties |
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