Facial and meridional [N-C-N]- intramolecular coordination systems: structure of fac-PtBrMe2{2,6-(pzCH2)2C6H3}.1/2C6H6{[2,6-(pzCH2)2C6H3]- =2,6-(bis{(pyrazol-1-yl)methyl}phenyl)} and mer-PtBr{2,6-(3,5-Me2pzCH2)2C6H3}, and an alternative synthetic route to the platinum(II) [N-C-N} kernel

Intramolecular coordination by the six-membered monoanionic N,C,N chelating system 2,6-(pyrazol-1-ylmethyl)phenyl and substituted derivatives can give rise to facial and meridional coordination, exhibited by structural studies of facial coordination in the platinum(IV) complex PtBrMe22,6-(pzCH2)2C6H3·1/2C6H6 and meridional coordination in the platinum(II) complex PtBr2,6-(3,5-Me2pzCH2)2C6H3 showing close to `ideal' geometry for the [N-C-N]- donor sets. A platinum(IV) complex is formed by oxidative addition of 2,6-(3,5-Me2pzCH2)2C6H3Br to [PtMe2(SEt2)]2, but reaction with [Pt(p-Tol)2(SEt2)]2 gives the platinum(II) complex PtBr2,6-(3,5-Me2pzCH2)2C6H3 and 4,4′-bitolyl. © 2000 Elsevier Science S.A. All rights reserved.