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A planar conformation of 1,3-thiazolidine-2-thione (TZDTH), C3H5NS2, was crystallized for the first time. The new triclinic polymorph (P\overline 1) obtained was compared in terms of its intra- and intermolecular geometry with three previous reports of a monoclinic polymorph (P2(1)/n). The packing is based on centrosymmetric dimers of TZDTH, linked by N-H...S hydrogen bonds.

Os compostos hidrotris(2-mercaptotiazolil)borato de potássio, KMt, (1), e hidrotris(2-metimazolil)borato de potássio, KTm, (2), foram preparados ao se reagir a amina tiol correspondente com KBH 4 . Foram caracterizados por métodos espectroscópicos e análise elementar. As estruturas no estado sólido de KMt.4H 2 O e do composto 2 foram determinadas por análises de difração de raios-X. A maior maciez do ânion em KMt.4H 2 O, em comparação com 2, é indicada pela ausência de interação entre ele e o cátion, que possui moléculas de água em sua esfera de coordenação. Em KMt.4H 2 O a geometria em torno do íon potássio é octaédrica distorcida e em 2, pirâmide de base quadrada distorcida. Em 2 o íon potássio está coordenado a dois átomos de enxofre dos anéis de um mesmo ânion e a três outros átomos de enxofre pertencentes a unidades KTm vizinhas. Ambos os compostos possuem uma estrutura polimérica.Potassium hydrotris(2-mercaptothiazolyl)borate, KMt, (1) and potassium hydrotris(2-methimazole), KTm, (2), were prepared by reacting the appropriate amine thiol with KBH 4 . They were characterized by spectroscopic methods and elemental analysis. Solid state structures of KMt.4H 2 O and compound 2 were determined by X-ray diffraction analyses. The softer nature of the anion in the former as compared to 2 is indicated by the lack of interaction of the anion with the cation, that has water molecules in its coordination sphere. In KMt.4H 2 O the geometry around the potassium cation is distorted octahedral and in 2, distorted square pyramidal. In 2 the potassium ion is coordinated to two sulfur atoms of one hydrotris(methimazole)borate unit and to other three sulfur atoms belonging to neighboring KTm units. Both compounds have a polymeric structure.