The new helical zigzag chain {[Ag(Pepy)(NO 3)]} ∞ and mononuclear [HPepy(FeCl 4)] with 3D network based on hydrogen bonds as well as π–π interactions

Abstract

The title complexes, {[Ag(Pepy)(NO 3)]} ∞ ( 1) and [HPepy(FeCl 4)] ( 2) (Pepy = trans-2-(2-phenylethyleneyl)pyridine), had been synthesized and characterized structurally by single-crystal X-ray diffraction analysis, FTIR as well as thermal analysis. The geometrical structure of complex 1 is a one-dimensional helical zigzag chain. Each Ag I center is five-coordinated by two NO 3 - anions and one Pepy ligand while the NO 3 - anion is an uncommon tetra-dentate coordinating to two Ag I by O atoms, respectively. The NO 3 - anions connecting with Ag I as bridge blocks resulted in the formation of crystalline of helical polymeric chain. In the mononuclear complex 2, the Fe III center is four-coordinated by four Cl − as [FeCl 4] − anion, which connected with hydrogen atoms from the protonated N atom and the C atoms from HPepy + to form multivalent hydrogen bonded network through N–H⋯Cl and C–H⋯Cl interactions. The two frameworks can be both considered as a 3D structure driven by diverse hydrogen bonds as well as π–π stacking interactions.