Investigations on organozinc compounds XII. Coordination chemistry of organozinc compounds RZnX: Organozinc compounds of the type EtZnNPhCSZ

Abstract

The coordination chemistry of the organozinc-nitrogen compounds EtZnNPhCSZ (Z = H, Me, OMe, SMe and NPh2) has been studied. Whereas the benzeneinsoluble EtZnNPhCSH appears to be a coordination polymer, all the other compounds occur as dimers in benzene solution. A structure with four-coordinate zinc and three-coordinate sulphur and nitrogen atoms seems plausible for these compounds in solution. The occurrence of thiocarbonyl coordination is supported by the PMR data. The compound with Z = SMe decomposes into EtZnSMe and PhNCS above 15°. With pyridine, monomeric complexes are formed (Z = Me, OMe, SMe). The Py complex of EtZnNPhCSH is more likely dimeric. EtZnNPhCSNPh2 forms a complex with Py. All the compounds readily form monomeric complexes with N,N,N,N-tetramethylethylenediamine (TMED) some of which may contain five-coordinate zinc.