REACTION OF TRANSITION-METAL THIOLATO UNITS V - FORMATION OF A BINUCLEAR MERCURY(II) COMPLEX WITH THE DITHIOLATO LIGAND I-MNT (1,1-DICYANOETHYLENE-2,2-DITHIORATE)

The binuclear complex (Et4N)(4)[Hg-2(i-mnt)(4)]. 2EtOH was obtained fr om the reaction of Hg(OAc)(2) with K-2(i-mnt) in EtOH-MeCN in the pres ence of Et4NBr. The centrosymmetric molecule can be viewed as a dimer of [Hg(i-mnt)(2)](2-). The tetrahedrally coordinated Hg atoms are sepa rated by 3.33 Angstrom with two types of coordination modes for the i- mnt ligand: terminal chelation (mode I) and end-to-end bridging (mode II). One of the S-C bonds in the terminal ligand. is found to possess a certain degree of double bond character (1.68(1) A), indicating high degree of delocalization. C-13 NMR showed little effect of Hg(II) coo rdination to the chemical shifts. (C) 1998 Elsevier Science Ltd. All r ights reserved.