Structure and Dynamics in a Bis(perfluoroalkyl)triazapentadiene Methylmercury Compound

The compound [Ph 2 N 3 C 2 (C 3 F 7 ) 2 ]HgCH 3 was synthesized from Na[Ph 2 N 3 C 2 (C 3 F 7 ) 2 ] and CH 3 -HgCl. In solution, it exists as a mixture of two isomers that interconvert slowly on the NMR time scale. Both isomers feature a η 1 -Ph 2 N 3 C 2 (C 3 F 7 ) 2 ligand. In the asymmetrical one, the CH 3 Hg group is bonded to one of the two terminal nitrogen atoms. In the more stable symmetrical isomer, [PhN=C(C 3 F 7 )] 2 NHgCH 3 , mercury is attached to the central nitrogen atom. It is this isomer that crystallizes and that was characterized by X-ray diffraction. Thermodynamic parameters for the CH 3 Hg shift reaction were obtained by DNMR spectroscopy. 1 9 F NMR spectra were analyzed. A metallotropic rearrangement was not observed in [Ph 2 N 3 C 2 (C 3 F 7 ) 2 ]AuPPh 3 .