Synthesis, characterization, electrochemistry, and photophysical studies of triarylamine-containing zinc(ii) diimine bis-thiolate complexes

• Published in: Dalton transactions : an international journal of inorganic chemistry Vol. 44; no. 43; pp. 18983 - 18992
• Main Authors: Yu, Tao, Au, Vonika Ka-Man, Tsang, Daniel Ping-Kuen, Chan, Mei-Yee, Yam, Vivian Wing-Wah
• Format: Journal Article
• Language: English
• Published: England 01.01.2015
• Subjects: Bands; Charge transfer; Dichloromethane; Emission analysis; Emission spectroscopy; Maxima; NMR spectroscopy; Thin films
• ISSN: 1477-9226; 1477-9234
• DOI: 10.1039/c5dt02920a

A series of triarylamine-containing Zn( ii ) diimine bis-thiolate complexes, [Zn(N^N)(SC 6 H 4 Me-4) 2 ] (N^N = 5,5′-bis( N , N -diaryl-4-[ethen-1-yl]-aniline)-2,2′-bipyridine or 1,10-bis( N , N -diaryl-4-[ethen-1-yl]-aniline)-phenanthroline), were synthesized and characterized by 1 H NMR spectroscopy, FAB mass spectrometry and satisfactory elemental analysis. Some of the complexes exhibited intense emissions in dichloromethane solution with maxima at 611-685 nm, which originated from both ligand-to-ligand charge transfer [p π (SR − ) → π*(diimine)] and intraligand charge transfer [π(triarylamine) → π*(diimine)] excited states. The emission maxima were tuned by variation of the donor or acceptor moieties. Thin film emission studies were also carried out on the complexes. All these complexes showed similar Gaussian-shaped emission bands with emission energies similar to those observed in dichloromethane solution at 298 K. In addition, the emission bands displayed concentration-dependent properties in thin-film emission studies. A series of triarylamine-containing Zn( ii ) diimine bis-thiolate complexes were synthesized and characterized by 1 H NMR spectroscopy, FAB mass spectrometry and satisfactory elemental analysis.