Issue 11, 2016

Intense blue emission and a reversible hypsochromic shift of luminescence caused by grinding based on silver(i) complexes

Abstract

Silver(I) complexes bearing N-heterocyclic carbene and diphenylphosphinobenzene ligands, [Ag(IPr)(dppbz)]BPh4 (1, IPr = bis(2,6-diisopropylphenyl)imidazole-2-ylidene, dppbz = 1,2-bis(diphenylphosphino)benzene), [Ag(IPr)(dfpbz)]BPh4 (2, dfpbz = 1,2-bis[di(4-fluorophenyl)phosphino]benzene), and [Ag(IPr)(dtbpbz)]BPh4 (3, dtbpbz = 1,2-bis[bis[3,5-di(tert-butyl)phenyl]phosphino]benzene), were newly synthesized and characterized. These complexes, especially 3, exhibit intense blue emission in the solid state. The maximum wavelength and lifetime of the photoluminescence of 3 are 440 nm and 14 μs, respectively. The quantum yield of the photoluminescence of 3 in the solid state is 0.5, which is one of the highest values among blue-emissive silver(I) complexes ever reported. Introduction of bulky tert-butyl groups at 3- and 5-positions of the phenyl groups in the diphosphine ligand plays a key role in both the blue-shift and the enhancement of the photoluminescence. Additionally, the reversible hypsochromic shift of the long-lived emission caused by the grinding process is observed for one of the complexes.

Graphical abstract: Intense blue emission and a reversible hypsochromic shift of luminescence caused by grinding based on silver(i) complexes

Supplementary files

Article information

Article type
Research Article
Submitted
16 Jul 2016
Accepted
23 Aug 2016
First published
26 Aug 2016

Inorg. Chem. Front., 2016,3, 1381-1387

Intense blue emission and a reversible hypsochromic shift of luminescence caused by grinding based on silver(I) complexes

D. Kakizoe, M. Nishikawa, T. Degawa and T. Tsubomura, Inorg. Chem. Front., 2016, 3, 1381 DOI: 10.1039/C6QI00254D

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