Investigation of the solvatochromic electronic transitions of [Ru(NH3)(4)bipyridine](2+)

Citation
Jh. Streiff et al., Investigation of the solvatochromic electronic transitions of [Ru(NH3)(4)bipyridine](2+), CHEM P LETT, 312(5-6), 1999, pp. 369-375
Citations number
21
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
CHEMICAL PHYSICS LETTERS
ISSN journal
00092614 → ACNP
Volume
312
Issue
5-6
Year of publication
1999
Pages
369 - 375
Database
ISI
SICI code
0009-2614(19991029)312:5-6<369:IOTSET>2.0.ZU;2-G
Abstract
The electronic transitions of [Ru(NH3)(4)bipyridine](2+) were examined. The two longest wavelength absorption bands red-shift with increasing Gutmann donor number of the solvent, and the lowest energy band is split by about 1 500 cm(-1) in a mixed alcohol glass at 77 K. INDO/S calculations were emplo yed to interpret the solvent-dependent electronic spectrum. The calculation predicts a number of closely spaced d(pi) --> pi* transitions, polarized i n the plane of the bipyridine, as well as weak perpendicularly polarized no n-bonding d --> pi* transitions. The results point out the limitations of s imple molecular orbital descriptions of nominal metal-to-ligand charge-tran sfer transitions. (C) 1999 Elsevier Science B.V. All rights reserved.