From: "Saved by Internet Explorer 11" Subject: Synthesis and characterization of mononuclear copper(II) aspirinate adducts with imidazole and its methyl derivatives - ScienceDirect Date: Fri, 10 Feb 2017 13:14:00 +0200 MIME-Version: 1.0 Content-Type: multipart/related; type="text/html"; boundary="----=_NextPart_000_0000_01D2839F.8AE26FE0" X-MimeOLE: Produced By Microsoft MimeOLE V6.1.7601.23573 This is a multi-part message in MIME format. ------=_NextPart_000_0000_01D2839F.8AE26FE0 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable Content-Location: http://www.sciencedirect.com/science/article/pii/S0277538700805355?via%3Dihub =EF=BB=BF
A synthetic investigation of copper(II) aspirinate addition compounds = with=20 imidazoles has led to the isolation of monomers of the form = [Cu(asp)2=20 =C2=B7 Ln], where asp is the aspirinate anion and n = =3D 4 when L is=20 imidazole or N-methylimidazole and n =3D 2 when L is=20 1,2-dimethylimidazole. These compounds have been characterized by means = of=20 elemental analysis, magnetic moments, electronic, IR and ESR = spectroscopic=20 properties. The tetrakis-adducts of imidazole and N-methylimidazole = showed=20 physical properties which indicated a tetragonal six-coordinated = configuration=20 containing the (CuN4+O2) chromophore. For the = bis-adduct=20 of 1,2-dimethylimidazole, the proposed geometry is a tetragonal = distorted=20 octahedron, having essentially the CuN2O2 = chromophore in a=20 trans distorted square-planar environment. The adoption of = monomeric=20 rather than the more common dimeric structure is discussed in terms of = the=20 electronic and steric effects of these imidazole = ligands.