Wydział Chemii

Anna Piecha

Ryszard Jakubas

Vasyl V. Kinzhybalo

Wojciech Medycki

2012

Journal of Molecular Structure

1013

55-60

10.1016/j.molstruc.2012.01.014

Naukowa

Angielski

Artykuł

Two thiazolium analogs, (C₃H₄NS)₆Sb₄Br₁₈·2H₂O (TBA) and (C₃H₄NS)₆Bi₄Br₁₈·2H₂O (TBB), have been synthesized and structurally characterized. The compounds appeared to be isomorphous and crystallize in the triclinic symmetry, space group P (at 100 K). These ionic complexes are built up of thiazolium cations, centrosymmetric [M₄Br₁₈]⁶⁻ anions (M = Sb, Bi) and water molecules. One of three independent thiazolium cations was found to be disordered (two-site model). The cations are hydrogen bonded to [M₄Br₁₈]⁶⁻ moieties and water molecules. The water molecule (O_w) acts as a donor of the O–H⋯Br and an acceptor of the N–H⋯O types of hydrogen bonds. The dielectric dispersion studies disclosed a low frequency relaxation process characterized by a significant slowing down of two independent dielectric relaxators. The dielectric behavior was explained by the motion of thiazolium cations and water molecules The molecular motions of the thiazolium and water molecules were studied by means of the ¹H NMR spin–lattice relaxation time (T₁) measurements.

Thiazolium cation

https://doi.org/10.1016/j.molstruc.2012.01.014

http://www.elsevier.com