The reaction of ammonium tetra(isothiocyanato)diamminechromate(III) with ɛ-caprolactam in aqueous solution. Revised refinement of the structure of (HCpl)[Cr(NCS)].

Autor: Isakova, I., Peresypkina, E., Virovets, A., Cherkasova, E., Cherkasova, T.
Zdroj: Russian Journal of Inorganic Chemistry; May2012, Vol. 57 Issue 5, p684-691, 8p
Abstrakt: A reaction of ammonium tetra(isothiocyanato)diamminechromate(III) (ammonium reineckate) with ɛ-caprolactam in aqueous solution at different pH values gave the novel complexes (NH)[Cr(NH)(NCS)] · 7Cpl ( I), (NH)[Cr(NH)(NCS)] · 2.5Cpl · 0.5(HO) ( II), and (HCpl)[Cr(NH)(NCS)] ( III), where Cpl is ɛ-caprolactam (ɛ-CHNO). The crystals of complexes I-III are triclinic, space group $P\bar 1$; I: a = 12.7058(4) Å, b = 13.2544(4) Å, c = 19.4487(7) Å, α = 105.2360(10)°, β = 106.6410(10)°, γ = 91.5290(10)°, V = 3009.37(17) Å, ρ = 1.245 g/cm, Z = 2; II: a = 12.3144(5) Å, b = 12.6518(5) Å, c = 23.3300(8) Å, α = 75.4580(10)°, β = 80.0760(10)°, γ = 61.0830(10)°, V = 3074.1(2) Å, ρ = 1.358 g/cm, Z = 4; III: a = 6.4701(4) Å, b = 12.5973(9) Å, c = 16.5556(12) Å, α = 108.769(2)°, β = 98.543(2)°, γ = 90.345(2)°, V = 1261.36(15) Å, ρ = 1.437 g/cm, Z = 2. The structure refinement for (HCpl)[Cr(NCS)] ( IV) was revised. Like complex III, complex IV contains the cation (HCpl) stabilized by a strong hydrogen bond between the O atoms of the ɛ-caprolactam molecules; the cation was structurally characterized for the first time. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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