Synthesis, Characterization and Antibacterial Properties of Complex [Ag(SCN)(2-NH2py)]

Abstract

The reaction of AgSCN with 2-aminopyridine in ammonia solution produces the colorless crystal of catena-poly [Ag(SCN))(C6H5N2)]n. The crystals were characterized by FTIR analysis and single crystal X-Ray diffraction. The silver(I) ion bind to one N atom of 2-aminopyridine, one N atom of thiocyanate and two S atoms of two thiocyanates to form a pseudo-tetrahedral complex. The presence of thiocyanates bridge ligand give an one-dimensional polymer. Complex [Ag(SCN)(2-NH2py)] crystallizes in monoclinic lattice and P21 space group with a=9,122(3) Å, b=4,1506(15) Å, c=11,269(4) Å, α= γ= 90°, β= 109,214(8)°, R= 0,0287. Intermolecular hydrogen bonds between amino group and thiocyanate NH-H…N-CS (2.389 Å) are also found in this structure. In vitro antibacterial screening complex was evaluated against two bacteria (Escherichia coli and Staphylococcus aureus). The results show that complex has higher antibacterial activity than 2-aminopyridine and KSCN. This is due to central ion and the ability of the ligand to interact with membrane proteins.