A DENSITY-FUNCTIONAL STUDY OF FECO, FECO-, AND FECO+

被引:58
作者
CASTRO, M
SALAHUB, DR
FOURNIER, R
机构
[1] UNIV MONTREAL,CTR EXCELLENCE DYNAM MOLEC & INTERFACIALE,MONTREAL H3C 3J7,PQ,CANADA
[2] NATL RES COUNCIL CANADA,STEACIE INST MOLEC SCI,OTTAWA K1A 0R6,ON,CANADA
[3] NATL AUTONOMOUS UNIV MEXICO,FAC QUIM,SECC QUIM TEOR,MEXICO CITY 04510,DF,MEXICO
关键词
D O I
10.1063/1.466766
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The binding energies, structural parameters, and vibrational frequencies of FeCO, FeCO-, and FeCO+ were studied with a Linear combination of Gaussian-type orbitals-density functional (LCGTO-DF) method. The ground state of FeCO is found to be (3) Sigma(-) and the calculated dissociation energy, with respect to ground state Fe(D-5,3d(6)4s(2)) and CO ((1) Sigma(+)), is 30 kcal/mol; after correcting for the atomic states separation of the iron atom this value becomes 17 kcal/mol, which is relatively close to the most recent experimental values 8.1+/-3.5-10.5+/-3.7 kcal/mol. Quartet ground states were found for both FeCO+ and FeCO- and the calculated dissociation energies (with respect to ground state Fe+ Fe-, and CO) are 50 and 31 kcal/mol, respectively. There is agreement between theory and experiment in that D(FeCO+)>D(FeCO-)>D(FeCO). The omega(e)'s we calculate for FeCO are, in cm(-1) 658 (Fe-C stretch), 1982 (C-O stretch), and 368 (bend). These values are reasonably close to their experimental counterparts, 530+/-10, 1950+/-10, and 330+/-50. For FeCO- we have found 566 and 272 cm(-1) for the Fe-C stretch and bend modes while the experimental values are 465+/-10 and 230+/-40 cm(-1). A frequency of 1831 cm(-1) is predicted for the C-O stretch of FeCO-. The sigma-donation (CO-->Fe) and pi-back-donation (Fe-->CO) charge transfer mechanism is operative in these species.
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页码:8233 / 8239
页数:7
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