Silver Nitrate Complexes of Nitrogen-Containing Heterocycles

Abstract

Pyrazole, 1,2,4-triazole, and 8-amino-quinoline form complexes as neutral ligands with silver nitrate in slightly acidic aqueous medium. With pyrazole a 2:1 complex (1) is obtained. The crystal structure determination revealed an ionic structure with independent NO 3 - anions and centrosymmetrical (pyr) 2 Ag + cations with a linear coordination geometry at the silver atoms. The reactions with 1,2,4-triazole and 8-amino-quinoline yield dimeric 1:1 complexes (2,3), in which the silver atoms are bridged by the ligands and have short contacts with nitrate oxygen atoms. The coordination geometry of the metals can thus be described as distorted tetrahedral. A 1:1 complex with 2,3-diphenyl-1,2,4-triazole (2a) and a 2:1 complex with 8-hydroxy-quinoline (4) have also been prepared, but not characterized in detail.