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1 BAND OF THE FeNO RADICAL PRODUCED BY THE ULTRAVIOLET LASER PHOTOLYSIS OF Fe(CO)2(NO)2.
SEIKI IKEDA, MOTOKI NAKASHIMA AND KEIICHI TANAKA, Department of Chemistry, Faculty of Science, Kyushu University, Hakozaki, Higashiku, Fukuoka, 812-8581 JAPAN.
Rovibrational transitions of the
1 band (N-O stretch) of the FeNO radical were observed in the 1750-1780 cm-1 region. The FeNO radical was produced by 193 nm excimer laser photolysis of Fe(CO)2(NO)2 and the transient absorption signal was detected by time-resolved infrared diode laser spectroscopy.
More than 40 lines were assigned to the
1 fundamental band of the
= 5/2 spin component, together with ten Q-branch lines (J = 2.5 - 11.5) in the 1760 cm-1 region, to confirm the electronic ground state to be X2
i. Effective molecular constants for the
= 5/2 spin component, including the band origin
0 (1767.26093(38) cm-1), the rotational constant B (4610.17754(93) MHz) and the centrifugal distortion constant D (1.17003(47) kHz), were derived from a least squares fitting of the observed transitions. The average bond length r Co-N between Co and N was calculated to be 1.621 Å~from the rotational constant B0 assuming r N-O = 1.186 Å~as given by ab~initio calculation. The
1 hot band lines originated from the
2 (Fe-N-O bending; 308 cm-1~a) vibrationally excited state were also observed. Pure rotational lines of FeNO were also observed by the millimeter wave spectroscopy with the UV photolysis of Fe(CO)2(NO)2.