Five Ag(Ι) metal–organic coordination complexes with dinuclear units: Synthesis and crystal structures

Abstract

Five new Ag(Ι) metal–organic coordination complexes with dinuclear structure units, Ag 2( L 1 ) 2(NO 3) 2 ( 1), Ag 2( L 2 ) 3(ClO 4) 2 ( 2), Ag 2( L 2 ) 3(NO 3) 2 ( 3), [Ag 2( L 3 ) 3(BF 4) 2](H 2O) 0.25 ( 4) and [Ag 2( L 4 ) 2(CH 3OH) 2](ClO 4) 2 ( 5) were synthesized, using ligands L 1 ( N-1,3,4-thiadiazol-2-yl-propionamide), L 2 [ N-(5-methyl-1,3,4-thiadiazol-2-yl)-propionamide], L 3 ( N-1,3,4-thiadiazol-2-yl-benzamide) and L 4 [ N-(5-methyl-1,3,4-thiadiazol-2-yl)-benzamide] as building blocks. All complexes were structurally characterized by elemental analyses, IR spectroscopy and X-ray diffraction. Complexes 1– 5 have dinuclear structure units. Compounds 1 and 5 are centrosymmetric different from 2 to 4, in 2– 4 two distinct Ag(Ι) were observed in the independent crystallographic dinuclear unit. In 1, 4 and 5, ligands bridge two Ag(Ι) atoms to form an approximately planar binuclear structure containing six-membered ring (Ag–N–N–) 2. In complexes 1– 5, the Ag⋯Ag weak interactions were observed between the two non-bonding Ag(Ι) centers in the dinuclear unit and the Ag⋯Ag distance are in 3.150–3.481 Å.