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Your search keyword '"Maria I. Altbach"' showing total 3 results
Start Over Author "Maria I. Altbach" Publisher american chemical society (acs)
3 results on '"Maria I. Altbach"'

1. Carbon-13 NMR chemical shielding tensor of the bridging methylene unit in cis-(.mu.-CH2)(.mu.-CO)[FeCp(CO)]2

Author

Leslie G. Butler, Ae Ja Kim, and Maria I. Altbach

Subjects
chemistry.chemical_classification, Bridging (networking), Chemistry, General Chemistry, Nuclear magnetic resonance spectroscopy, Electronic structure, Carbon-13 NMR, Biochemistry, Catalysis, Crystallography, chemistry.chemical_compound, Colloid and Surface Chemistry, Nuclear magnetic resonance, Methylene, Inorganic compound, Chemical shielding, Magnetic dipole–dipole interaction
Published
1991

3. Determination of the charge on carbon in a bridging methylene iron dimer with solid-state deuterium NMR spectroscopy

Author

Maria I. Altbach, Dennis J. Gerson, Leslie G. Butler, and Yukio Hiyama

Subjects
chemistry.chemical_classification, Deuterium NMR, Stereochemistry, Chemical shift, General Chemistry, Nuclear magnetic resonance spectroscopy, Carbon-13 NMR, Biochemistry, Catalysis, chemistry.chemical_compound, Crystallography, Colloid and Surface Chemistry, chemistry, Deuterium, Cyclopentadienyl complex, Methylene, Inorganic compound
Abstract

The chemistry of bridging methylene metal dimers and the value of the /sup 13/C NMR chemical shifts have been interpreted as due to a partial negative charge on the carbon atom. PES yields a C/sub 1s/ binding energy indicative of -0.5 e charge. However, for (..mu..-CH/sub 2/)(MnCp(CO)/sub 2/)/sub 2/, a high-resolution x-ray diffraction electron density map shows no excess charge buildup. The authors are attempting to resolve the dilemma by using solid-state deuterium NMR techniques. In the results for cis-(..mu..-C/sup 2/H/sub 2/)(..sigma..-CO)(FeCp/sup d/(CO))/sub 2/ (Cp/sup d/ and 5% deuteriated cyclopentadienyl) presented here, the authors find no evidence for an excess negative charge on the bridging methylene carbon atom.

Published
1987

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