A series of [Cu(N-N)(P-P)]BF 4 complexes: Luminescence quenching caused by electron-configuration transformation in excited state

Document Type

Article

Publication Date

4-1-2012

Abstract

In this paper, we report a series of [Cu(N-N)(P-P)]BF 4 complexes based on two phosphorous ligands and three 1,10-phenanthrolin derived diimine ligands, including their syntheses, characterizations, crystal structures. Their photophysical properties were experimentally measured and theoretically analyzed by time-dependent density functional theory (TD-DFT). It is found that the introduction of too many fused phenyl rings into diimine ligand leads to luminescence absence of corresponding [Cu(N-N)(P-P)] + complexes at room temperature. A detailed analysis suggests that the thermal activated electron-configuration transformation between the [Cu(N-N)(P-P)] + triplet metal-to-ligand-charge-transfer ( 3MLCT) state and the lowest lying excited state of its diimine ligand ( 3LC) is responsible for the luminescence quenching. © 2011 Elsevier B.V. All rights reserved.

Publication Source (Journal or Book title)

Inorganica Chimica Acta

First Page

225

Last Page

232

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