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Abrecht DG, Fultz B. Evaluation of the Thermodynamic Properties of H(2) Binding in Solid State Dihydrogen Complexes [M(η(2)-H(2))(CO)dppe(2)][BArF(24)] (M = Mn, Tc, Re): an Experimental and First Principles Study. J Phys Chem C Nanomater Interfaces. 2012;116(42):22245-22252doi: 10.1021/jp308176f.
Abrecht, D. G., & Fultz, B. (2012). Evaluation of the Thermodynamic Properties of H(2) Binding in Solid State Dihydrogen Complexes [M(η(2)-H(2))(CO)dppe(2)][BArF(24)] (M = Mn, Tc, Re): an Experimental and First Principles Study. The journal of physical chemistry. C, Nanomaterials and interfaces, 116(42), 22245-22252. https://doi.org/10.1021/jp308176f
Abrecht, David G, and Fultz, Brent. "Evaluation of the Thermodynamic Properties of H(2) Binding in Solid State Dihydrogen Complexes [M(η(2)-H(2))(CO)dppe(2)][BArF(24)] (M = Mn, Tc, Re): an Experimental and First Principles Study." The journal of physical chemistry. C, Nanomaterials and interfaces vol. 116,42 (2012): 22245-22252. doi: https://doi.org/10.1021/jp308176f
Abrecht DG, Fultz B. Evaluation of the Thermodynamic Properties of H(2) Binding in Solid State Dihydrogen Complexes [M(η(2)-H(2))(CO)dppe(2)][BArF(24)] (M = Mn, Tc, Re): an Experimental and First Principles Study. J Phys Chem C Nanomater Interfaces. 2012 Oct 25;116(42):22245-22252. doi: 10.1021/jp308176f. PMID: 23243479; PMCID: PMC3521573.
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J Phys Chem C Nanomater Interfaces. 2012 Oct 25;116(42):22245-22252. doi: 10.1021/jp308176f.

Evaluation of the Thermodynamic Properties of H(2) Binding in Solid State Dihydrogen Complexes [M(η(2)-H(2))(CO)dppe(2)][BArF(24)] (M = Mn, Tc, Re): an Experimental and First Principles Study.

The journal of physical chemistry. C, Nanomaterials and interfaces

David G Abrecht, Brent Fultz

Affiliations

  1. W. M. Keck Laboratory, California Institute of Technology, 1200 E California Blvd., MC 138-78, Pasadena, CA, 91125 USA.

PMID: 23243479 PMCID: PMC3521573 DOI: 10.1021/jp308176f

Abstract

The solid state complex [Mn(CO)dppe(2)][BArF(24)] was synthesized and the thermodynamic behavior and properties of the hydrogen absorption reaction to form the dihydrogen complex [Mn(η(2)-H(2))dppe(2)][BArF(24)] were measured over the temperature range 313K-373K and pressure range 0-600 torr using the Sieverts method. The absorption behavior was accurately described by Langmuir isotherms, and enthalpy and entropy values of ΔH(∘)=-52.2 kJ/mol and ΔS(∘)=-99.6 J/mol-K for the absorption reaction were obtained from the Langmuir equilibrium constant. The observed binding strength was similar to metal hydrides and other organometallic complexes, despite rapid kinetics suggesting a site-binding mechanism similar to physisorption materials. Electronic structure calculations using the LANL2DZ-ECP basis set were performed for hydrogen absorption over the organometallic fragments [M(CO)dppe(2)](+) (M= Mn, Tc, Re). Langmuir isotherms derived from calculation for absorption onto the manganese fragment successfully simulated both the pressure-composition behavior and thermodynamic properties obtained from experiment. Results from calculations for the substitution of the metal center reproduced qualitative binding strength trends of 5d > 3d > 4d previously reported for the group 6 metals.

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