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• W2032668524 abstract "Complexes of the type [Pt(L)Cl 3 ] − (L = pyridine derivative) were synthesized and studied by 13 C and 195 Pt NMR spectroscopies. The 195 Pt signals were observed between −1720 and −1897 ppm. No correlation between the δ(Pt) and the pK a of the protonated pyridine derivatives was found. The chemical shifts vary with the substituents on the pyridine ligand. Compounds with substituents in ortho positions were observed at lower fields, except for complexes containing hydroxy or amine groups. The latter compounds were observed at higher fields, close to the signals of the Pt-unsubstituted pyridine compound. These results were explained in terms of the solvent effect. The chemical shifts δ(C) and the coupling constants J( 13 C– 195 Pt) were measured and the results interpreted with a view of obtaining information on the nature of the Pt—N bond. The possibility of π-bonding between platinum and the pyridine ligand is examined. The conformation of the pyridine ring in relation to the platinum plane and the energies of the rotation barriers around the Pt—N bond in these types of platinum(II) complexes are briefly discussed. The crystal structure of trans-Pt(2,6-(HOCH 2 ) 2 py) 2 Cl 2 •2H 2 O was determined by X-ray diffraction. The compound is monoclinic, C2/m, a = 7.022(6), b = 15.646(13), c = 8.344(10) Å, β = 93.35(8)°, Z = 2, R = 0.037. The platinum atom is located at the junction of the twofold axis and the mirror plane, the N atoms and the para-C atom of the pyridine ring are situated on the twofold axis, and the chloride ligands are on the mirror plane. The compound crystallizes with molecules of water, which are H-bonded to the hydroxy groups. The Pt—Cl bond distance is 2.306(2) Å, and that of the Pt—N bond is 2.041 (6) Å. The dihedral angle between the platinum and the pyridine planes is 79.8°. Key words: platinum, pyridine derivatives, NMR, crystal structure." @default.
• W2032668524 created "2016-06-24" @default.
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• W2032668524 date "1996-11-01" @default.
• W2032668524 modified "2023-09-27" @default.
• W2032668524 title "Multinuclear NMR spectra of [Pt(L)Cl₃]⁻ (L = pyridine derivatives) complexes and crystal structure of <i>trans</i>-Pt(2,6-di(hydroxymethyl)pyridine)₂Cl_2•2H₂O" @default.
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• W2032668524 doi "https://doi.org/10.1139/v96-241" @default.
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