Preparation, structural studies, and magnetic properties of coordination complexes of bimetallic arylplatinum compounds and pyridyl nitronyl nitroxide radicals
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Treatment of 1,3-C6H4I2 with Pt(PEt3)4 in toluene leads to the isolation of [1,3-(Pt(PEt3)2I)2C6H 4] (2). This complex has been characterized by 1H, 13C and 31P NMR and elemental analysis. The structure of 2 as well as that of [1,4-(Pt(PEt3)2I)2C6H 4] (1) have been determined by single crystal X-ray analysis. As expected, the platinum centers of these derivatives adopt a square planar coordination geometry with the phosphine ligands in a trans arrangement. Treatment of compounds 1 and 2 with AgPF6 and subsequent addition of two equivalents of NITpPy (NITpPy= [2-(4-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide]) results in the formation of [1,4-(Pt(PEt3)2(NITpPy))2C6H 4]2+[PF6]-2) (3) and [1,3-(Pt(PEt3)2(NITpPy))2C6H 4]2+[PF6]-2 (4), respectively. Compounds 3 and 4 have been characterized by +ESI/TOF, IR, UV and elemental analysis. Their structures have been determined by X-ray crystallography which confirmed the coordination of a NITpPy ligand at each platinum center. As in 1 and 2, the platinum centers adopt a square planar coordination geometry with the phosphine ligands in a trans arrangement. As shown by EPR spectroscopy and SQUID magnetometry, intramolecular magnetic coupling of the coordinated NITpPy moieties does not occur.
Journal of the Chemical Society, Dalton Transactions
author list (cited authors)
Gardinier, J. R., Clrac, R., & Gabba, F. P.
complete list of authors
Gardinier, James R||Clérac, Rodolphe||Gabbaï, François P