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New trivalent gold (d8 electronic configuration) halide complexes with guanidino–pyrimidines have been synthesized and delineated. The complexes have been identified and characterized by elemental analysis, u.v.–vis. electronic absorption spectra, i.r. oscillation spectra and by 1H-n.m.r. and 13C-n.m.r. spectra. All substituted guanidine ligands in these chelates form part of a six-membered pseudo-heterocyclic...