Au(III) and Pt(II) Complexes of a Novel and Versatile 1,4-Disubstituted 1,2,3-Triazole-Based Ligand Possessing Diverse Secondary and Tertiary Coordinating Groups

A novel 1,4-disubstituted 1,2,3-triazole-based ligand, 2-(4-(pyridin-2-yl)-1H-1,2,3-triazol-1-yl)­propane-1,3-diamine (ptpd), which possesses pyridyl and diamino secondary and tertiary coordinating groups was synthesized in excellent yield. The reactivity of 2-(1-phenyl-1H-1,2,3-triazol-4-yl)­pyridine (ptp), di-tert-butyl (2-azido­propane-1,3-diyl)­dicarbamate (Boc2-ptpd), and ptpd·3HCl was investigated with Au­(III) and Pt­(II) precursors. Analysis including X-ray crystal structures of [Au­(III)­Cl3­(ptp)] (1), [Au­(III)­Cl2­(ptpd)]­[Au­(I)­Cl2]­[OH]­{[NaAu­Cl4·2H2O]}n (3), and [Pt­(II)­Cl2­(ptpdH2)]­[PtCl4] (4) revealed that ptpd (i) serves as a monodentate ligand for Au­(III) coordinating to the metal center via the pyridine nitrogen only, (ii) preferentially coordinates Au­(III) via the bidentate diamino group over the monodentate pyridine group, (iii) can coordinate Pt­(II) in a bidentate fashion via the pyridyl nitrogen and the triazole N-3, and (iv) can bridge two Pt­(II) centers through bidentate chelation at the diamino group and bidentate chelation via the pyridyl nitrogen and the triazole N-3. ptpd represents a versatile ligand template for the development of mixed metal complexes