Hydrogen-bonded coordination network in crystal structures of [Cu(3-PM)4Cl2] and [Cu(4-PM)4Cl]Cl, (PM = pyridylmethanol)

Abstract

The crystal and molecular structures of [Cu(3-PM)4Cl2] (1) and [Cu(4-PM)4Cl]Cl (2) have been determinated by X-ray crystallography. Complex 1 crystallizes in the triclinic system, space group P−1, with lattice parameters a = 7.972(2) A, b = 8.293(2) A, c = 10.707(2) A, α = 105.73(3)°, β = 90.04(3)°, γ = 110.38(3)°, and Z = 1 at 100 K. The coordination geometry of each Cu atom is approximately octahedral formed by four nitrogen atoms of pyridine rings of 3-pyridylmethanol molecules in the equatorial plane and two chlorine atoms occupying the axial positions. The O—H⋯sO, C—H⋯sCl, and O—H⋯sCl intermolecular hydrogen bonds and π ⋯s π stacking link the molecules in 3-D hydrogen-bonded coordination network. Complex 2 crystallizes in the tetragonal system, space group P4/n, with lattice parameters a = 10.464(1) A, c = 11.339(2) A, and Z = 2 at 217 K and a = 10.352(1) A, c = 11.201(2) A, and Z = 2 at 293 K. The coordination geometry of Cu atom in the [Cu(4-PM)4Cl]+ ion is approximately square pyramidal formed by four nitrogen atoms of pyridine rings of 4-pyridylmethanol molecules in equatorial plane and one chlorine atom in axial position. The O—H⋯sCl and C—H⋯sCl intermolecular hydrogen bonds link the molecules in 2-D hydrogen-bonded coordination network.