Metal complexes of [1,2,4]triazolo-[1,5-a]pyrimidine derivatives

This article covers all the research work published until September 1998 ab out the coordination chemistry of 1,2,4-triazolo-[1,5-a]pyrimidine derivati ves. The revision is mainly focused in the structural features of the compo unds, obtained from single crystal X-ray diffraction. The references are cl assified according to the present metal atoms. These kind of ligands displa y a broad versatility when binding metal ions, monodentate binding through the endocyclic nitrogen atom at position 3 being however their main coordin ating behaviour. Dimeric and polymeric structures are observed when a biden tate binding through N3-N4 or N3-N1, respectively, takes place. N1-O7 chela ting binding mode has also been observed in a few cases. In some cases, dim ers or polymers are also generated when the present auxiliary ligands are t he ones that bridge the metal centres. (C) 1999 Elsevier Science S.A. All r ights reserved.