Abstract
Light-induced metastable states were found in trans- and cis-[RuCl(en) 2NO]Cl 2, trans- and cis-[RuBr(en) 2NO]Br 2, trans-[Ru(H 2O)(en) 2NO]Cl 3, and a mixture of fac- and mer-[RuCl 3(en)NO]. These states are formed when the polycrystalline samples are irradiated with blue or green laser lines from an Ar ion laser at 77 K. They decay upon irradiation with red light or a rise in temperature. The NO stretching frequency that is observed in the range from 1865 to 1904 cm −1 in the ground (normal) state of each compound shifts to the lower frequency side by approx. 100–140 cm −1 in the metastable states. These characteristics are similar to those of the metastable states of Na 2[Fe(CN) 5NO]·2H 2O, K 2[RuHCl 5NO] and K 2[Ru(NO 2) 4(OH(NO)]. Decay temperatures of the ethylenediaminenitrosyl-ruthenium(II) complexes are notably higher (approx. 230–270 K) than those of the substances examined in earlier studies (approx. 180–190 K).
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