TY - JOUR
T1 - Synthesis, crystal structure, magnetic properties and EPR spectra of copper(II) acetate derivatives
T2 - Tetra-(μ-acetato)bis(2-methylaminopyridine) copper(II) and catena-poly(aquadiacetato-μ-3-aminomethylpyridine)copper(II). Sheets formed by chains connected through hydrogen-bonds
AU - Barquín, Montserrat
AU - González Garmendia, María J.
AU - Pacheco, Sergio
AU - Pinilla, Elena
AU - Quintela, Silvia
AU - Seco, José M.
AU - Torres, María R.
PY - 2004/8/5
Y1 - 2004/8/5
N2 - The derivatives of Cu(OAc)2·H2O with 2-methylaminopyridine and 3-aminomethylpyridine, [Cu2(μ-OAc) 4(MeNHpy)2] (1) and [Cu(OAc)2(μ-NH 2CH2py)(H2O)]n (2), respectively, have been synthesized and characterized. Compound 1 shows the dimer structure of [Cu2(μ-OAc)4(H2O)2], with four syn-syn bridging acetate groups and the MeNHpy ligand coordinated in the axial positions. It is antiferromagnetic (2J=-285 cm-1). Signals of the triplet state are observed in its EPR spectrum and the zero-field splitting parameter has been calculated (D=0.36 cm-1; g∥=2.35; g⊥=2.07). Otherwise, the ligand 3-aminomethylpyridine acts as bridging bidentate ligand in compound 2, forming infinite zig-zag chains. Each copper atom lies in a square-planar pyramidal coordination, determined by two nitrogen atoms of two bridge ligands, two oxygen atoms of two monodentate terminal acetate groups and a water molecule. The parallel chains form a sheet because of the hydrogen bonds between them. The shortest Cu-Cu distances are: 5.1270, 6.0952 and 6.2163 Å (inter-chains) and 7.875 Å (intra-chain). Compound 2 shows a slight antiferromagnetic effect below 30 K. The EPR spectra show an orthorhombic signal (g1=2.26; g 2=2.08; g3=2.06).
AB - The derivatives of Cu(OAc)2·H2O with 2-methylaminopyridine and 3-aminomethylpyridine, [Cu2(μ-OAc) 4(MeNHpy)2] (1) and [Cu(OAc)2(μ-NH 2CH2py)(H2O)]n (2), respectively, have been synthesized and characterized. Compound 1 shows the dimer structure of [Cu2(μ-OAc)4(H2O)2], with four syn-syn bridging acetate groups and the MeNHpy ligand coordinated in the axial positions. It is antiferromagnetic (2J=-285 cm-1). Signals of the triplet state are observed in its EPR spectrum and the zero-field splitting parameter has been calculated (D=0.36 cm-1; g∥=2.35; g⊥=2.07). Otherwise, the ligand 3-aminomethylpyridine acts as bridging bidentate ligand in compound 2, forming infinite zig-zag chains. Each copper atom lies in a square-planar pyramidal coordination, determined by two nitrogen atoms of two bridge ligands, two oxygen atoms of two monodentate terminal acetate groups and a water molecule. The parallel chains form a sheet because of the hydrogen bonds between them. The shortest Cu-Cu distances are: 5.1270, 6.0952 and 6.2163 Å (inter-chains) and 7.875 Å (intra-chain). Compound 2 shows a slight antiferromagnetic effect below 30 K. The EPR spectra show an orthorhombic signal (g1=2.26; g 2=2.08; g3=2.06).
KW - Chains
KW - Copper
KW - Dimers
KW - Hydrogen bonds
KW - Sheets
UR - https://www.scopus.com/pages/publications/3242773776
U2 - 10.1016/j.ica.2004.04.002
DO - 10.1016/j.ica.2004.04.002
M3 - Article
AN - SCOPUS:3242773776
SN - 0020-1693
VL - 357
SP - 3230
EP - 3236
JO - Inorganica Chimica Acta
JF - Inorganica Chimica Acta
IS - 11
ER -