Summary
Metal ion complexes of the thiosemicarbazone,4 N-cyclohexyl-2-[1-(2-pyridinyl)ethylidene]hydrazinecarbothioamide (HL4CH), have been prepared and spectrally characterised. Both the size of the cyclohexyl-group attached at4N as well as the4N hydrogen affect the stoichiometry and stereochemistry of the isolated complexes. The large cyclohexyl-group evidently causes the isolation of [Fe(HL4CH) (L4CH)H2O](ClO4) instead of the expected [Fe(L4CH)2]ClO4[Co(L4CH)Br] instead of [Co(HL4CH)Br2], and [Ni(L4CH)Br] instead of [Ni(HL4CH)2Br2]. The presence of the hydrogen at4N presumably hinders the deprotonation of HL4CH on complex formation since [Cu(HL4CH)Cl2] was isolated rather than [CuLCl], which occurs when the thiosemicarbazone has4N with two alkyl groups or incorporated in a ring. Further, although we prepared [Ni(L4CH)Br], complexes of this stoichiometry are planar and diamagnetle when4N does not have a hydrogen(s) attached to it rather than tetrahedral and paramagnetic as has been found for the present complex.
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West, D.X., Profilet, R.D. & Hines, J.L. Transition metal ion complexes of thiosemicarbazones derived from 2-acetylpyridine. Part 5. The4 N-cyclohexyl derivative. Transition Met Chem 13, 467–471 (1988). https://doi.org/10.1007/BF01043714
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DOI: https://doi.org/10.1007/BF01043714