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1.
J Inorg Biochem ; 98(1): 15-23, 2004 Jan.
Article in English | MEDLINE | ID: mdl-14659628

ABSTRACT

The synthesis of 2-(2-pyridyl)iminotetrahydro-1,3-thiazine (PyTz) has been carried out, as well as the determination of its X-ray crystal structure, together with the coordination behaviour and equilibra study of PyTzHCl.2H2O with copper(II) in aqueous solution at 298 K and 0.1 M ionic strength in NaClO4. The formation constants are determined and discussed in terms of the characteristics of the ligand. The compound Di-mu-chloro-bis[chloro[2-(2-pyrydil-kappaN)amino-5,6-dihydro-4H-1,3-thiazine-kappaN]copper] has been isolated and its crystal and molecular structure determined by X-ray analysis. The structure consists of dimeric molecules [Cu2Cl4L2], in which copper ions are bridged by two chloro ligands. The geometry about each copper approximates to a distorted square pyramid with the bridging ligands occupying apical and equatorial sites of each copper ion, while the PyTz ligand and the remaining chloride ion are located in an equatorial plane. The compound was also characterized through elemental analysis, magnetic susceptibility, electron paramagnetic resonance, and electronic and infrared spectroscopies.

2.
Bioinorg Chem Appl ; : 307-16, 2004.
Article in English | MEDLINE | ID: mdl-18365082

ABSTRACT

The compound aquanitrate-small ka, CyrillicObis[2-(2-pyridy)-imin-small ka, CyrillicN-N-(2-thiazin-small ka, CyrillicN-2-y)thiazidine]cbat() nitrate has been isolated and characterized by single crystal X-ray diffraction, IR spectroscopy, UV-Vis-NIR diffuse reflectance and magnetic susceptibility measurements. The environment around the cobalt atom may be described as a distorted octahedral geometry with the ligand-metal-ligand bite angles varying between 84.07(8)( degrees ) and 98.66(8)( degrees ).The metallic atom is coordinated to two thiazoline nitrogens [av. Co-N =2.067 A], two imino nitrogens [av. Co-N =2.122 A], one oxygen atom of the nitrate group monodentate [Co-O(1)= 2.249(2) A] and the oxygen atom of the water molecule [Co-O(IW)= 2.105(2) A]. Electronic UV-Vis-NIR spectral data and the calculated magnetic moment are indicative of octahedral Co(ll) complexes. In the same way as other PyTT complexes, the organic moiety preserves the imino-thiazolidine form detected in the structure of PyTT.

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