1 1026 LOW-TEMPERATURE FTIR CHARACTERIZATION OF INTERMEDIATES FORMED IN COURSE OF NITRIC OXIDE DISPROPORTIONATION UPON ITS REACTION WITH LAYERED RU(TPP)(CO) A.S. Azizyan 1 , T.S. Kurtikyan 1,2 , G.G. Martirosyan 2 , P.C. Ford 3 1 Armenian Institute Of Applied Chemistry (ARIAC), Armenia, 2 Molecule Structure Research Center (MSRC) NAS, Armenia, 3 Department Of Chemistry And Biochemistry, University Of California, Santa Barbara, CA, USA One scenario for NO disproportionation upon the solution reaction with the ruthenium(II) porphyrin carbonyl complexes Ru(Por)(CO) (eq. 1) involves initial formation of a mixed nitrosyl carbonyl complex Ru(P)(CO)(NO). This subsequently labilizes CO and forms the dinitrosyl analog Ru(P)(NO)2, the key intermediate responsible for NO disproportionation [1]. It also has been shown that thin porous layers of solid Ru(TPP)(CO) (TPP = meso- tetra-phenylporphyrinato dianion) also promote NO disproportion resulting in formation of Ru(TPP)(ONO)(NO) and evolution of N2O [2]. (eq.1) In this presentation the details of the low-temperature interaction of NO with thin sublimed layers of Ru(TPP)(CO) are studied using FTIR spectral measurements and additional data provided by NO and CO isotopomers. The thermally unstable mixed ligand complex Ru(TPP)(CO)(NO) is thus spectrally characterized as is the dinitrosyl complex Ru(TPP)(NO)2, which is fairly stable in these solid state matrices. References: [1] Lorković I., Ford P. Inorg. Chem. 1999, 38, 1467. [2] Kurtikyan T., Martirosyan G., Lorković I., Ford P. J. Amer. Chem. Soc., 2002, 124, 10124.