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- W2076240699 abstract "New, paramagnetic penta- and hexa-coordinate adducts of bis(diaryldithiophosphinato)nickel-(II), Ni(R2PS2)2 (R = phenyl or p-tolyl) have been synthesized. Quinoline and α-substituted pyridines gave 1:1 adducts, the spectra and magnetism of which indicate the stabilization of the NiS4N chromophore. Their dissolution in chloroform leads to dissociation which could be suppressed in the presence of added base. Pyridine, γ-picoline, 4-phenylpyridine, isoquinoline and quinaldine formed 1:2 octahedral paramagnetic adducts containing the NiS4N2 chromophore, which dissociate in solution to pentacoordinate species. The interaction of o-phenanthroline and 2,2′-bipyridyl with Ni(R2PS2)2 resulted in the isolation of green 1:1 adducts with the NiS4N2 chromophore as well as 1:2 adducts with the NiS2N4 chromophore. In contrast to other adducts they did not dissociate in solution. Thermogravimetric analysis of the 1:2 compounds with monodentate bases indicates that they decompose to Ni(R2PS2)2 passing through a 1:1 intermediate. Assignments of i.r. frequencies in the region 4000−400 cm−1 have been made wherever possible. It is proposed that the steric effect imposed by the group in α-substituted pyridines is responsible for stabilizing the NiS4N chromophore. The steric effect of β-picoline is intermediate between α- and γ-picolines as evident from the isolation of 1:1 as well as 1:2 adducts with this base." @default.
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- W2076240699 date "1974-05-01" @default.
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- W2076240699 title "Penta- and hexa-coordinate adducts of bis(diaryldithiophosphinato)nickel(II) with nitrogen heterocycles" @default.
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- W2076240699 doi "https://doi.org/10.1016/0022-1902(74)80210-1" @default.
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