Highly-phosphorescent tungsten(0) carbonyl pyridyl-imidazole complexes as photosensitisers.

Autor: Lee JJ; Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543 Singapore. chmfanwy@nus.edu.sg., Yap CP, Chwee TS, Fan WY
Jazyk: angličtina
Zdroj: Dalton transactions (Cambridge, England : 2003) [Dalton Trans] 2017 Aug 22; Vol. 46 (33), pp. 11008-11012.
DOI: 10.1039/c7dt02397a
Abstrakt: Photoluminescence data are reported for two W(CO) 4 L complexes (L = 2-(1H-imidazol-2-yl)pyridine and 2-(2'-pyridyl)benzimidazole) in room-temperature solutions. The bidentate ligands consist of a pyridine and an imidazole moiety connected by a C-C bond. The complexes have been found to exhibit enhanced phosphorescence from the metal-to-ligand charge transfer (MLCT) excited state with quantum yields in the order of 10 -3 , almost two orders of magnitude higher than those reported for W(CO) 4 (diimine) complexes. One of the complexes W(CO) 4 (2-(2'-pyridyl)benzimidazole) can serve as an efficient visible-light photosensitiser for the isomerisation of aromatic alkenes with efficiency comparable to and even exceeding that of the well-studied ruthenium tris-bipyridine complex, Ru(bpy)Cl 2 .
Databáze: MEDLINE