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Int. J. Mol. Sci. 2002, 3(7), 764-776; doi:10.3390/i3070764
Article

Quantum Chemical and FTIR Spectroscopic Studies on the Linkage Isomerism of Carbon Monoxide in Alkali-Metal-Exchanged Zeolites: A Review of Current Research

1,* , 1, 2 and 3
Received: 21 May 2002; Accepted: 13 June 2002 / Published: 30 July 2002
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Abstract: When adsorbed (at a low temperature) on alkali-metal-exchanged zeolites, CO forms both M(CO)+ and M(OC)+ carbonyl species with the extra-framework alkali-metal cation of the zeolite. Both quantum chemical and experimental results show that C-bondend adducts are characterized by a C−O stretching IR band at a frequency higher than that of 2143 cm-1 for free CO, while for O-bonded adducts this IR band appears below 2143 cm-1. The cation-CO interaction energy is higher for M(CO)+ than for M(OC)+ carbonyls, although the corresponding difference decreases substantially when going from Li+ to Cs+. By means of variable-temperature FTIR spectroscopy, this energy difference was determined for several alkali-metal cations, and the existence of a thermal equilibrium between M(CO)+ and M(OC)+ species was established. The current state of research in this field is reviewed here, with a view to gain more insight into the thermal isomerization process.
Keywords: Alkali metal carbonyls; CO adsorption; FTIR spectroscopy; Linkage isomerism; Zeolites Alkali metal carbonyls; CO adsorption; FTIR spectroscopy; Linkage isomerism; Zeolites
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Areán, C.O.; Palomino, G.T.; Tsyganenko, A.A.; Garrone, E. Quantum Chemical and FTIR Spectroscopic Studies on the Linkage Isomerism of Carbon Monoxide in Alkali-Metal-Exchanged Zeolites: A Review of Current Research. Int. J. Mol. Sci. 2002, 3, 764-776.

AMA Style

Areán CO, Palomino GT, Tsyganenko AA, Garrone E. Quantum Chemical and FTIR Spectroscopic Studies on the Linkage Isomerism of Carbon Monoxide in Alkali-Metal-Exchanged Zeolites: A Review of Current Research. International Journal of Molecular Sciences. 2002; 3(7):764-776.

Chicago/Turabian Style

Areán, C. O.; Palomino, G. T.; Tsyganenko, A. A.; Garrone, E. 2002. "Quantum Chemical and FTIR Spectroscopic Studies on the Linkage Isomerism of Carbon Monoxide in Alkali-Metal-Exchanged Zeolites: A Review of Current Research." Int. J. Mol. Sci. 3, no. 7: 764-776.


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