Synthesis and study of Pt(II)-aromatic amines complexes of the types cis- and trans-Pt(amine)2(NO3)2 and cis-Pt(amine)2(R(COO)2) |
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| Authors: | Fernande D Rochon Gassan Massarweh Catherine Bonnier |
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| Institution: | Département de chimie, Université du Québec à Montréal, C.P. 8888, Succ. Centre-ville, Montréal, Canada H3C 3P8 |
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| Abstract: | Complexes of the types cis- and trans-Pt(amine)2(NO3)2 with amines containing a phenyl group were synthesized and studied mainly by IR and multinuclear magnetic resonance spectroscopies. The cis complexes could be synthesized pure only with the amines of the type Ph-R-NH2 (R = alkyl), while pure trans compounds were synthesized with all the studied amines. In 195Pt NMR spectroscopy, the dinitrato complexes of the amines Ph-R-NH2 were observed around −1700 ppm for the cis isomers and at about −1580 for the trans complexes. For the other amines, where a phenyl ring is directly attached to the amino group, the signals were observed at lower fields, −1528 ppm for cis-Pt(PhNH2)(NO3)2 and around −1450 ppm for all the trans isomers. There is a linear relationship between the δ(Pt) of the Pt(amine)2(NO3)2 complexes and the pKa of the protonated amines. The coupling constants 2J(195Pt-1HN) are larger in the cis compounds (ave. 76 Hz) than in the trans isomers (ave. 63 Hz). The complexes cis-Pt(amine)2(R(COO)2) with bidentate dicarboxylato ligands were also synthesized and characterized mainly by IR spectroscopy. The compounds apparently decompose in DMF and are too insoluble in other solvents for solution studies. |
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| Keywords: | Platinum Aromatic amine Nitrato Carboxylato NMR IR |
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