Premium
Spectroscopy and Photophysics in Cyclometalated Ru II –Bis(bipyridyl) Complexes
Author(s) -
MuroSmall Maria L.,
Yarnell James E.,
McCusker Catherine E.,
Castellano Felix N.
Publication year - 2012
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201200460
Subject(s) - chemistry , quinoline , bipyridine , resonance raman spectroscopy , ultrafast laser spectroscopy , pyridine , excited state , spectroscopy , photochemistry , ligand (biochemistry) , ruthenium , cyclic voltammetry , molecule , absorption spectroscopy , resonance (particle physics) , raman spectroscopy , crystallography , electrochemistry , medicinal chemistry , organic chemistry , crystal structure , biochemistry , physics , receptor , electrode , quantum mechanics , nuclear physics , optics , catalysis , particle physics
A series of cyclometalated Ru II coordination compounds of the general structural formula [Ru(bpy) 2 (C∧N)]PF 6 {C∧N = 2‐phenylpyridine ( 1 ), 2‐(2,4‐difluorophenyl)pyridine ( 2 ), 2‐(4‐methoxyphenyl)‐5‐methylpyridine ( 3 ), benzo[ h ]quinoline ( 4 ); bpy = 2,2′‐bipyridine} have been synthesized, structurally and electrochemically characterized, and examined by using a battery of spectroscopic techniques. The combination of static and dynamic photoluminescence at room temperature and 77 K, resonance Raman spectroscopy, cyclic voltammetry, spectroelectrochemistry, and ultrafast transient absorption spectroscopy reveal that – although the nature of the cyclometalating ligand substantially affects the oxidation potential at the metal center – the lowest‐energy metal‐to‐ligand charge‐transfer excited state always retains pure Ru→bpy character across this series of molecules, and the cyclometalating subunit plays the role of ancillary ligand.