The new helical zigzag chain {[Ag(Pepy)(NO3)]}∞ and mononuclear [HPepy(FeCl4)] with 3D network based on hydrogen bonds as well as π–π interactions
摘要:
The title complexes, {[Ag(Pepy)(NO3)]}(infinity) (1) and [HPepy(FeCl4)] (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-1 center is five-coordinated by two NO3- anions and one Pepy ligand while the NO3- anion is ail uncommon tetra-dentate coordinating to two Ag-1 by O atoms, respectively. The NO3- anions connecting with Ag-1 as bridge blocks resulted in the formation of crystalline of helical polymeric chain. In the mononuclear complex 2, the Fe-II, center is four-coordinated by four Cl- as [FeCl4](-) 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-(HCl)-Cl-. . . and C-(HCl)-Cl-. . . interactions. The two frameworks can be both considered as a 3D structure driven by diverse hydrogen bonds as well as pi-pi stacking interactions. (c) 2005 Elsevier B.V. All rights reserved.