Differential Line Broadening in the Presence of Quadrupolar–CSA Interference

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Abstract:

The formalism for calculating the lineshape of a spin 1/2J-coupled to a high-spin nucleus undergoing quadrupolar and chemical shift anisotropy (CSA) relaxations is derived in the case where the tensors of both interactions are noncoincident and nonaxial. The expressions show that the CSA–quadrupolar interference term which is responsible for the asymmetry of lines involves a term depending on tensorial parameters. The effect of this term on the lineshapes is discussed with respect to three cases, namely coincident–axially symmetric, noncoincident–axially symmetric, and general noncoincident quadrupolar and CSA tensors. These cases are considered in the analysis of the lineshape of the1H-decoupled spectra of the31P nucleusJ-coupled to the59Co nucleus encountered in the tetrahedral cluster HFeCo3(CO)11PPh2H.

Document Type: Research Article

Affiliations: 1: Institut de Chimie, UMR 50 CNRS–Bruker–Université Louis Pasteur, BP 296, Strasbourg Cédex, 67008, France 2: Institut de Chimie, UMR 50 CNRS–Bruker–Université Louis Pasteur, BP 296, Strasbourg Cédex, 67008, France, Laboratoire de Chimie de Coordination, Université Louis Pasteur, 4 rue Blaise Pascal, Strasbourg Cédex, 67070, France

Publication date: February 1, 1998

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