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Resonance Raman and time-resolved resonance Raman studies of complexes of divalent ruthenium with bipyridine and 4,4′-bipyrimidine ligands

✍ Scribed by David J. Ma'nuel; Dennis P. Strommen; Anwar Bhuiyan; Milan Sykora; James R. Kincaid

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
319 KB
Volume
28
Category
Article
ISSN
0377-0486

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✦ Synopsis

Resonance Raman (RR) and time-resolved resonance Raman (TR3) spectra are reported for the complexes of divalent ruthenium with the ligands 4,4º-bipyrimidine (bpm) and 2,2º-bipyridine (bpy), i.e. and Ru(bpm) 3 2' Ground-state RR studies of the latter employing excitation with radiation of 413.1, 457.9 and Ru(bpy) 2 (bpm)2'. 514.5 nm permit the assignment of an electronic absorption band maximizing at 428.5 nm to a Ru(II)-to-bpy charge-transfer transition, while the band maximum at 516.0 nm is assigned to the Ru(II)-to-bpm charge-transfer band. The TR3 studies employing the 354.7 nm harmonic of a 10 ns pulsed Nd : YAG laser provide deÐnitive evidence for selective population of the bpm-localized excited state for the heteroleptic complex Ru(bpy) 2 (bpm)2'. 1997

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