Infrared Absorption Spectra of Electronically Excited Long-lived Metastable States in Na2[Ru(CN)5NO].2H2O

J. A. GÜIDA; O. E. PIRO; P. S. SCHAIQUEVICH; P. J. AYMONINO

SOLID STATE COMMUNICATIONS

Pergamon

Año: 1997 vol. 101 p. 471 - 475

0038-1098

[Ru(CN),NO]2- can be excited selectively by two very long-lived electronic metastable states (MS1 and MSII) by irradiation at low temperature with blue-near UV light. Upon excitation to MS1 and MS11 states, CN and NO modes suffer frequency down-shifts, a fact which implies softening of the named bonds. Shifts of vibrational modes of the RuNO group are far larger than shifts of CN modes, a fact that indicates that the metastable states involve electronic transitions mainly located at that group. The MS1 and MS11 states decay when heating at two different onset temperatures TI < TII. A thermally driven MSI-to-MS11 excitation transfer process taking place in the temperature range TII > T > TI shows that MS11 is energetically below MSI.