STUDIES ON MAIN GROUP METAL TRANSITION-METAL BONDED COMPOUNDS .7. HG-199 NMR-STUDY OF SOME GROUP-VI TRANSITION-METAL MERCURY-COMPOUNDS

A 199Hg Fourier Tranformation NMR study has been carried out on Hg[M(CO)3C5H5]2 (M = Cr, Mo, W), [C5H5(CO)3M]HgCl, and [C5H5(CO)3W]HgX (X = Cl, Br, I, SCN). The 199Hg chemical shifts are -80, +115 and -348 ppm respectively for the symmetrical compounds, -542, -617, and -997 ppm for the chloride and -1200, -1529 and -924 ppm for the Br, I, SCN-tungsten derivatives respectively. The 199Hg chemical shifts for several other mercury derivatives are reported for comparison. All chemical shifts are relative to 90% HgMe2/10% internal lock C6F6 with positive values indicating decreasing shielding. The J199 values are 151, 706, 690, 630 and 684 Hz for the symmetrical compound and the Cl, Br, I and SCN derivatives respectively. The factors which may influence these parameters are discussed briefley. © 1972.