892127-20-7Relevant articles and documents
Complexes of copper(II) formate with 2-(phenylamino)pyridine and 2-(methylamino)pyridine: New copper formato paddle-wheel compounds
Barquín, Montserrat,González Garmendia, María J.,Larrínaga, Liher,Pinilla, Elena,Torres, María R.
, p. 2424 - 2430 (2006)
The derivatives of Cu(HCOO)2 · 4H2O with 2-(phenylamino)pyridine and 2-(methylamino)pyridine, [Cu2(μ-HCOO)4(PhNHpy)2] (1), [Cu2(μ-HCOO)4(MeNHpy)2] (2) and Cu(HCOO)2(MeNHpy)2 (3), have been synthesized and characterized. Compounds 1 and 2 show the paddle-wheel structure of [Cu2(μ-HCOO)4L2], with four syn-syn bridging formato groups and two molecules of PhNHpy or MeNHpy coordinated to the axial positions, respectively. Intramolecular hydrogen bonds are formed in both cases: two in each dimer of 1 and four in the dimer of compound 2. The dimer units are oriented in two different directions. Dimers with the same orientation form rows along the c and the a axis in compounds 1 and 2, respectively, with a π-π stacking of the pyridine rings. In compound 1, an intercalation of the phenyl rings of contiguous rows of dimers gives rise to a succession of phenyl rings at a distance of 4.38 A? and an angle of 30.44° between alternate rings. They are antiferromagnetic. Signals of the triplet state are observed in their EPR spectra and the zero-field splitting parameter has been determined. Compound 3 obeys the Curie-Weiss law and the magnetic results indicate the absence of magnetic interaction between Cu(II) atoms.
