Three-Dimensional Structure Constructed via Hydrogen Bonds and π-π Stacking Interaction. Crystal Structure of [Cu(AFO)2(H2O)2](ClO4)2.2(AFO).2H2O (AFO = 4,5-Diazafluoren-9-one)

Abstract

The structure of the title complexes [Cu(AFO)2(H2O)2](ClO4)2.2(AFO).2H2O (AFO = 4,5-Diazafluoren-9-one)has been established by single-crystal X-ray diffraction. The complex crystallizes in the triclinic space group P-1 with cell constants a = 7.659(3) Å, b = 11.066(3) Å, c = 14.203(5) Å, alpha = 75.16(3)°, β = 79.87(3)°, gamma = 85.71(3)°, Z = 1. The structure was solved by direct methods and refined to R1 = 0.0595 (wR2 = 0.1164). The X-ray analysis reveals that a pair of AFO ligands chelate to a Cu(II) atom in an asymmetric fashion with one Cu-N bond being much longer than the other, the Cu(II) atom is further coordinated by a pair of aqua ligands to form an elongated octahedral geometry. In the crystal of the complex, the mononuclear complex cations [Cu(AFO)2(H2O)2]2+, uncoordinated AFO molecules, lattice water molecules and perchlorate anions are assembled into 3-D structure via hydrogen bonds and π-π stacking interaction.