Organo f-element thermochemistry. Thorium-Ligand bond disruption enthalpies in tris(cyclopentadienyl)thorium hydrocarbyls

David C. Sonnenberger, Tobin J Marks, Tobin J. Marks

Research output: Contribution to journalArticle

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Abstract

Thorium-ligand bond disruption enthalpies (D(Th-R)) have been determined in the series of complexes Cp3ThR, where Cp = η5-C5H5 and R = an alkyl group. Thermochemical data were obtained by anaerobic batch-titration solution calorimetry from enthalpies of solution of the Cp3ThR complexes in toluene followed by enthalpies of alcoholysis with CF3CH2OH. D(Th-R)gas values obtained (2σ) were as follows: CH2Si(CH3)3, 86.1 (3.6) kcal/mol; CH3, 82.7 (1.1) kcal/mol; CH2C(CH3)3, 77.9 (3.0) kcal/mol; CH2C6H5, 77.9 (2.2) kcal/mol; CH(CH3)2, 77.3 (2.7) kcal/mol. These disruption enthalpies parallel but are significantly larger than those for the identical R functionalities in the Cp′ThR2 series, Cp′ = η5-(CH3)5C5.

Original languageEnglish
Pages (from-to)352-355
Number of pages4
JournalOrganometallics
Volume4
Issue number2
Publication statusPublished - 1985

Fingerprint

Thorium
Thermochemistry
thermochemistry
thorium
Enthalpy
enthalpy
Ligands
ligands
Toluene
Calorimetry
Titration
titration
toluene
heat measurement
Gases
methylidyne
gases

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Organic Chemistry

Cite this

Organo f-element thermochemistry. Thorium-Ligand bond disruption enthalpies in tris(cyclopentadienyl)thorium hydrocarbyls. / Sonnenberger, David C.; Marks, Tobin J; Marks, Tobin J.

In: Organometallics, Vol. 4, No. 2, 1985, p. 352-355.

Research output: Contribution to journalArticle

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N2 - Thorium-ligand bond disruption enthalpies (D(Th-R)) have been determined in the series of complexes Cp3ThR, where Cp = η5-C5H5 and R = an alkyl group. Thermochemical data were obtained by anaerobic batch-titration solution calorimetry from enthalpies of solution of the Cp3ThR complexes in toluene followed by enthalpies of alcoholysis with CF3CH2OH. D(Th-R)gas values obtained (2σ) were as follows: CH2Si(CH3)3, 86.1 (3.6) kcal/mol; CH3, 82.7 (1.1) kcal/mol; CH2C(CH3)3, 77.9 (3.0) kcal/mol; CH2C6H5, 77.9 (2.2) kcal/mol; CH(CH3)2, 77.3 (2.7) kcal/mol. These disruption enthalpies parallel but are significantly larger than those for the identical R functionalities in the Cp′ThR2 series, Cp′ = η5-(CH3)5C5.

AB - Thorium-ligand bond disruption enthalpies (D(Th-R)) have been determined in the series of complexes Cp3ThR, where Cp = η5-C5H5 and R = an alkyl group. Thermochemical data were obtained by anaerobic batch-titration solution calorimetry from enthalpies of solution of the Cp3ThR complexes in toluene followed by enthalpies of alcoholysis with CF3CH2OH. D(Th-R)gas values obtained (2σ) were as follows: CH2Si(CH3)3, 86.1 (3.6) kcal/mol; CH3, 82.7 (1.1) kcal/mol; CH2C(CH3)3, 77.9 (3.0) kcal/mol; CH2C6H5, 77.9 (2.2) kcal/mol; CH(CH3)2, 77.3 (2.7) kcal/mol. These disruption enthalpies parallel but are significantly larger than those for the identical R functionalities in the Cp′ThR2 series, Cp′ = η5-(CH3)5C5.

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