Carbon-13 and mercury-199 nuclear spin relaxation study on solution dynamics of the bis(phenylethynyl)mercury molecule and shielding anisotropy of its acetylenic carbon and mercury nuclei

Carbon-13 longitudinal relaxation times and nuclear Overhauser effect enhan cement factors at two magnetic fields and three temperatures were measured for a DMSO solution of bis(phenylethynyl)mercury and interpreted in terms o f molecular mobility of the solute molecule. The problem of the effective C --H bond length, crucial for the quantitative treatment of the relaxation d ata, was especially addressed. Then, using relaxation data for acetylenic c arbons and additionally measured longitudinal relaxation times of mercury-1 99, the shielding anisotropy parameters for these nuclei were calculated. C opyright (C) 2000 John Wiley & Sons, Ltd.