Synthesis, structures and photophysical properties of Cu(I) phosphine complexes with various diimine ligands

Lin-Li HU, Chang SHEN, Wing-Kin CHU, Jing XIANG, Fei YU, Ge XIANG, Yan NIE, Chun Leung KWOK, Chi Fai LEUNG, Chi-Chiu KO

Research output: Contribution to journalArticles

9 Citations (Scopus)

Abstract

A series of triphenylphosphine Cu(I) complexes with various diimine ligands, [Cu(N-N)(PPh₃)₂](ClO₄) [N-N = dmp (2); Ph₂Phen (3); Ph2dmp (4); dpq (5); dppz (6); phenCN (7); phenOH (8)] are synthesized by the ligand substitution reactions of [Cu(MeCN)₄](ClO₄) with 2 mole equiv. of PPh₃ ligand and 1.2 mole equiv. of diimine ligand. {Cu(dpq)[P(XPh)₃]₂}(ClO₄) [X = Me (5a); OMe (5b); Cl (5c)] and {Cu(phenOH)[P(XPh)₃]₂}(ClO₄) [X = Me (8a); OMe (8b)] are also obtained by using various substituted phosphine ligands. These mixed-ligand complexes have been characterized using ¹H and ³¹P NMR spectroscopy, IR spectroscopy, mass spectrometry and elemental analysis. Three of these complexes have been structurally characterized by X-ray crystallography. The photophysical and electrochemical properties of these complexes have been studied. These complexes exhibit MLCT phosphorescence with emission energy, lifetimes and quantum yields showing strong dependence on the nature of diimine and phosphine ligands. In particular, both the electronic and steric effects of the substituting groups in phosphine ligands are also found to affect the emission properties of the complexes. Our study provides structural-properties information for the future design of luminescent Cu(I) complexes. Copyright © 2017 Elsevier Ltd.
Original languageEnglish
Pages (from-to)203-211
JournalPolyhedron
Volume127
Early online dateFeb 2017
DOIs
Publication statusPublished - May 2017

Citation

Hu, L.-L., Shen, C., Chu, W.-K., Xiang, J., Yu, F., Xiang, G., et al. (2017). Synthesis, structures and photophysical properties of Cu(I) phosphine complexes with various diimine ligands. Polyhedron, 127, 203-211.

Keywords

  • Luminescent properties
  • Cu(I) complexes
  • Crystal structures
  • Electrochemistry
  • Steric effect
  • Electronic effect

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