CRYSTAL STRUCTURE OF A [(DIHYDROGEN PYROPHOSPHATO-K2O,O') BIS(1,10-PHENANTHROLINE-N,N')NICKEL(II)]2.5-HYDRATE [Ni(H2P2O7)(C12H8N2)2]x2.5H2O
S. Cherni, F. Zid, A. Driss
University Campus 2092, Tunis-Tunisia
Keywords: nickel pyrophosphate, hydrothermal synthesis, X-ray diffraction, ПЂв‹ЇПЂ stacking interactions, hydrogen bonds
Abstract
Coordination nickel pyrophosphate [Ni(H2P2O7)(C12H8N2)2]×2.5H2O (I) is hydrothermally synthesized and characterized by single crystal X-ray diffraction. The title compound crystallizes in the triclinic system, space group P-1, with cell parameters M = 640.07, a = 10.285(2) Å, b = 10.510(3) Å, c = 12.775(3) Å, a = 88.06(2)°, b = 77.87(2)°, g = 89.26(2)°, V = 1349.2(5) Å3, Z = 2, R 1[ I > 2s( I )] = 0.0438, wR 2[ I > 2s( I )] = 0.1244. This compound displays a new structure of ladder-like 2D layers parallel to (010) consisting of [Ni(H2P2O7)(phen)2] entities with the distorted octahedral NiN4O2 coordination geometry arising from two chelating 1,10-phenanthroline ligands and diphosphate [H2P2O7] ligand bridged through p⋯p stacking interactions between the neighboring 1,10-phen ligands with interplanar distances of 4.425 Å and 4.525 Å. In the compound, the phen ligands bind in a bidentate fashion to the metal atoms and the ladder-like structure of the compound extends into a three-dimensional supramolecular array via hydrogen bonds (O4-H17…O5) between diphosphate groups, which delimits b axis tunnels where water molecules are located.
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