Cyclic trinuclear silver (I) complex, AgPz (Pz = 3, 5-bis (trifluoromethyl) pyrazolate), serves as a versatile platform for interaction with NN-donor chelating aromatic ligands. In this study, pyrazolyl-1H-pyridine derivatives were proposed as ligands of this type, including 2- (3-phenyl-1H-pyrazole-5-yl) pyridine (L1) and 2-methyl-6- (3-phenyl-1H-pyrazole-5-yl) pyridine (L2). It was found that a complexes of the composition AgPzL (1: 1: 1), regardless of the stoichiometry of the reactants, form in solution. When the resulting compounds are crystallized from toluene, binuclear complexes with the composition AgPzL per one solvent molecule are formed. The formation of these structures is attributed to the formation of hydrogen bonds between the NH groups of pyrazole-pyridine (L) and the unshared electron pairs of the nitrogen atoms of the pyrazolate ligands. Shortened Ag. . . Ag contacts (3. 143-3. 197 Å) are observed in the complex, leading to additional stabilization of the structure. As a result, the compounds exhibit ligand-centered phosphorescence in the solid state at room temperature.
G.B. Yakovlev (Wed,) studied this question.