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1 BAND OF CoNO PRODUCED BY THE ULTRAVIOLET PHOTOLYSIS OF Co(CO)3NO.
TAKEO SOEJIMA, MOTOKI NAKASHIMA, SEIKI IKEDA 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 CoNO produced by the ultraviolet photolysis of Co(CO)3NO were observed in the 1775-1800 cm-1 region by time resolved infrared diode laser spectroscopy. In total, 35 absorption lines were assigned to the
1 fundamental band, and their J quantum numbers were determined by a simultaneous analysis with millimeter-wave spectroscopy. Hotband lines originated from the
2 (bending), 2
2, and
3 (Co-N stretch) vibrationally excited states were also observed. Molecular constants, including the band origin
0 1796.22371(49) cm-1, the rotational constant B_0 4669.7578(29) MHz, and the vibration rotation constant
1 31.325(28) MHz, were derived from the observed spectrum. The equilibrium rotational constant Be (4676.949(51) MHz) was determined with the
1 value derived in the present study and the
2 and
3 values reported by the millimeter-wave spectroscopya. The equilibrium bond-length r_Co-N was calculated to be 1.583 Å assuming r_NO = 1.182 Å by ab initio calculation. The absorption lines for the
1 +
2
2 and
1 + 2
2
2
2 bands were split into two components due to the
l=2 interaction. The electronic ground state of CoNO was confirmed to be 1
+ by this infrared study as reported by our previous millimeter-wave spectroscopya.