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7. Study of half-sandwich platinum group metal complexes bearing dpt-NH2 ligand

Author

Gupta, Gajendra, Prasad, Kota Thirumala, Das, Babulal, and Rao, Kollipara Mohan

Subjects
*TRANSITION metal complexes, *LIGANDS (Chemistry), *HYDROCARBONS, *AROMATIC compounds, *ORGANOTRANSITION metal compounds, *PLATINUM group
Abstract

Abstract: A quite general approach for the preparation of η5-and η6-cyclichydrocarbon platinum group metal complexes is reported. The dinuclear arene ruthenium complexes [(η6-arene)Ru(μ-Cl)Cl]2 (arene=C6H6, C10H14 and C6Me6) and η5-pentamethylcyclopentadienyl rhodium and iridium complexes [(η6-C5Me5)M(μ-Cl)Cl]2 (M=Rh, Ir) react with 2equiv. of 4-amino-3,5-di-pyridyltriazole (dpt-NH2) in presence of NH4PF6 to afford the corresponding mononuclear complexes of the type [(η6-arene)Ru(dpt-NH2)Cl]PF6 {arene=C10H14 (1), C6H6 (2) and C6Me6 (3)} and [(η6-C5Me5)M(dpt-NH2)Cl]PF6 {M=Rh (4), Ir (5)}. However, the mononuclear η5-cyclopentadienyl analogues such as [(η5-C5H5)Ru(PPh3)2Cl], [(η5-C5H5)Os(PPh3)2Br], [(η5-C5Me5)Ru(PPh3)2Cl] and [(η5-C9H7)Ru(PPh3)2Cl] complexes react in presence of 1equiv. of dpt-NH2 and 1equiv. of NH4PF6 in methanol yielded mononuclear complexes [(η5-C5H5)Ru(PPh3)(dpt-NH2)]PF6 (6), [(η5-C5H5)Os(PPh3)(dpt-NH2)]PF6 (7), [(η5-C5Me5)Ru(PPh3)(dpt-NH2)]PF6 (8) and [(η5-C9H7)Ru(PPh3)(dpt-NH2)]PF6 (9), respectively. These compounds have been totally characterized by IR, NMR and mass spectrometry. The molecular structures of 4 and 6 have been established by single crystal X-ray diffraction and some of the representative complexes have also been studied by UV–Vis spectroscopy. [Copyright &y& Elsevier]

Published
2010
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8. New series of platinum group metal complexes bearing η5- and η6-cyclichydrocarbons and Schiff base derived from 2-acetylthiazole: Syntheses and structural studies

Author

Prasad, Kota Thirumala, Gupta, Gajendra, Rao, Anna Venkateswara, Das, Babulal, and Rao, Kollipara Mohan

Subjects
*ORGANOMETALLIC compounds, *PLATINUM group, *COMPLEX compounds synthesis, *CYCLIC compounds, *SCHIFF bases, *STRUCTURAL analysis (Science), *CRYSTALLIZATION, *INFRARED spectroscopy, *NUCLEAR magnetic resonance spectroscopy
Abstract

Abstract: The mononuclear complexes [(η6-arene)Ru(ata)Cl]PF6 {ata =2-acetylthiazole azine; arene=C6H6 [(1)PF6]; p-iPrC6H4Me [(2)PF6]; C6Me6 [(3)PF6]}, [(η5-C5Me5)M(ata)]PF6 {M=Rh [(4)PF6]; Ir [(5)PF6]} and [(η 5-Cp)Ru(PPh3)2Cl] {η 5-Cp=η 5-C5H5 [(6)PF6]; η 5-C5Me5 (Cp∗) [(7)PF6]; η 5-C9H7 (indenyl); [(8)PF6]} have been synthesised from the reaction of 2-acetylthiazole azine (ata) and the corresponding dimers [(η6-arene)Ru(μ-Cl)Cl]2, [(η5-C5Me5)M(μ-Cl)Cl]2, and [(η5-Cp)Ru(PPh3)2Cl], respectively. In addition to these complexes a hydrolysed product (9)PF6, was isolated from complex (4)PF6 in the process of crystallization. All these complexes are isolated as hexafluorophosphate salts and characterized by IR, NMR, mass spectrometry and UV–Vis spectroscopy. The molecular structures of [2]PF6 and [9]PF6 have been established by single-crystal X-ray structure analyses. [Copyright &y& Elsevier]

Published
2009
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