Über Cyanatverbindungen und deren reaktives Verhalten. XXI. Reaktionsverhalten von Niob(V)- und Tantal(V)-thiocyanat gegenüber N-Donatoren |
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Authors: | H. B hland,E. Harke |
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Affiliation: | H. Böhland,E. Harke |
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Abstract: | Cyanate Compounds and their Reactivity. XXI. Reactivity of Niobium(V) and Tantalum(V) Thiocyanates to N-Donators M2(NCS)10 reacts with ammonia or primary and secondary aliphatic amines to complexes of the types [M(NCS)(NH2)2NH]x, [M(NCS)3(NHR)2 H2NR], or [M(NCS)3(NR′2)2 HNR′2], with N-heterocyclic amines in a first step to [M(NCS)5L]-complexes and in a further step through a redox mechanism to [M(NCS)4L2] complexes. [M(NCS)5(CH3CN)] mCH3CN reacts with ammonia, or primary amines in acetonitrile over acetamidine and amidinolytic cleavage of M-NCS bonds to complexes of the type [M(NCS)a(NC(NHR″)CH3)b(CH3C(NH)NHR″)]x. The prepared compounds are characterized by analytical data, derivatographic measurements, and IR or visible absorption spectra (M = Nb, Ta; x = 2; R = n-C4H9; R′ = C2H5; L = pyridine or 4-methyl-pyridine; m = 0, 1, 2; a = 1 or 4; b = 4 or 1; R″ = H, n-C4H9). |
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