Studies of tungsten-183 magnetic shielding by heteronuclear magnetic double and triple resonance

McFarlane, H. C. E., McFarlane, W. and Rycroft, D. S. (1976) Studies of tungsten-183 magnetic shielding by heteronuclear magnetic double and triple resonance. Journal of the Chemical Society: Dalton Transactions, 1976(16), pp. 1616-1622. (doi:10.1039/DT9760001616)

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Abstract

1H-{183W}, 1H-{31P}, and 1H-{183W, 31P} nuclear magnetic double- and triple-resonance experiments have been used to determine tungsten-183 chemical shifts and other parameters in 35 tungsten(0) complexes with tertiary phosphine, η-cyclopentadienyl, and other ligands. The observed chemical shifts are several thousand p.p.m. to high field of those for derivatives of WF6, and this is attributed to the occupancy of the dxy, dyz and dxz valence orbitals in addition to the dx2y2, and dz2, which reduces the d-electron imbalance and gives a smaller paramagnetic term. π-Back bonding with ligands produces a high-field shift and the marked sensitivity of the shielding to temperature and isotopic substitution is attributed to changes in electronic excitation energies.

Item Type:Articles
Keywords:Tungsten chemistry, NMR spectroscopy, multiple resonance.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Rycroft, Dr David
Authors: McFarlane, H. C. E., McFarlane, W., and Rycroft, D. S.
Subjects:Q Science > QD Chemistry
College/School:College of Science and Engineering > School of Chemistry
Journal Name:Journal of the Chemical Society: Dalton Transactions
Publisher:The Chemical Society
ISSN:0300-9246

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