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Thermodynamic characterization of hydrogen interaction with iridium polyhydride complexes

Published online by Cambridge University Press:  26 July 2012

Ragaiy A. Zidan  and
Richard E. Rocheleau
Ragaiy A. Zidan
Affiliation:
Hawaii Natural Energy Institute, University of Hawaii at Manoa, Honolulu, Hawaii 96822
Richard E. Rocheleau
Affiliation:
Hawaii Natural Energy Institute, University of Hawaii at Manoa, Honolulu, Hawaii 96822
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Hydrogen interaction with solid iridium complexes IrXH2(PPr i3)2 (X = Cl, I) was investigated. Gaseous hydrogen was found to react reversibly with solid chloro-iridium complex IrClH2(PPri3)2, forming IrClH2(PPri3)2H2 The relative partial molal enthalpy and entropy were obtained from equilibrium isotherms at different hydrogen concentrations. The decrease in entropy with increasing hydrogen concentration and the absence of plateaus in the equilibrium isotherms were consistent with a single phase solid solution with two chemical components. Hydrogen release from solid iodo-iridium complex IrIH2(PPri3)2H2 was not observed at temperatures up to 350 K, indicating stronger hydrogen bonding.

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Articles
Information
Journal of Materials Research , Volume 14 , Issue 1 , January 1999 , pp. 286 - 291
Copyright
Copyright © Materials Research Society 1999

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