Copper(II) and
lanthanoid(III) complexes of a new beta-diketonate ligand with an
appended non-coordinating phenol group
Tanase S , Viciano-Chumillas M , Smits JMM , de Gelder R , Reedijk J
Source: POLYHEDRON Volume: 28
Issue: 3 Pages: 457-460
Abstract:
New mononuclear compounds of the ligand
1-(2-hydroxyphenyl)-3-phenylpropane-1,3-dione (H2L) with Cu(II) and
several lanthanoid(III) ions, where Ln(III) = Pr, Nd, Eu, Gd, have been
synthesized and characterized by spectroscopic methods and X-ray
crystal structure determinations. In all compounds the, ligand
coordinates in a bidentate chelating manner, using the diketone
function. In the [Cu(HL)(2)], the coordination geometry of Cu(II) ion
is slightly distorted square-planar: two strong intramolecular (OH
center dot center dot center dot O) hydrogen-bonding interactions are
established between the phenolate group and the neighboring ketone
function. The lanthanoid(III) compounds have the general formula
[Ln(HL)(3)(CH3OH)(2)]center dot CH3OH center dot 2H(2)O; the
lanthanoid(III) ion (Ln) is eight-coordinated and the coordination
geometry is based on a distorted square-antiprism. In addition to the
intramolecular hydrogen bonding (OH center dot center dot center dot O)
intermolecular hydrogen-bonding interactions are also present between
the coordinated methanol molecule and the non-coordinated methanol
molecule giving rise to a three-dimensional network.