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Preparation and reactions of Cr/sup -/. The Cr-H bond strength

Journal Article · · J. Am. Chem. Soc.; (United States)
DOI:https://doi.org/10.1021/ja00358a049· OSTI ID:5580474
A Fourier transform mass spectrometer utilizing collision-induced dissociation (CID) of anionic chromium (Cr) carbonyl complexes was used to study the gas-phase reactivity of the metal anion. Measurements are consistent with a relatively weak Cr-C bond in CrCO/sup -/ which reflects the inherent stability of the 3d/sup 5/4s/sup 2/ Cr/sup -/ fragment. Also, the chromium atom is relatively weakly bound in Cr/sub 2/(CO)/sub 5//sup -/ as shown by the loss of the metal ion from the complex when subjected to low-energy CID excitation. A Cr-H bond energy of 41.8 +- kcal mol/sup -1/ was calculated from the literature reported electron affinity of Cr(1.5 +- 0.2 kcal mol/sup -1/), ionization potential of hydrogen (313.6 kcal mol/sup -1/), and the authors' assigned proton affinity of Cr (340 +- 3 kcal mol/sup -1/). 2 figures, 1 table.
Research Organization:
Purdue Univ., West Lafayette, IN
OSTI ID:
5580474
Journal Information:
J. Am. Chem. Soc.; (United States), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 105:20; ISSN JACSA
Country of Publication:
United States
Language:
English