Syntheses, characterization and X-ray structure of potassium hydrotris(2-mercaptothiazolyl)borate, KMt, and potassium hydrotris(methimazole)borate, KTm

Abstract

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.

Soft Scorpionate Ligands Based on Imidazole‐2‐thione Donors

“…The potassium ion is five‐coordinate, with each Tm ligand having one terminal and two bridging sulfur donors. This results in an infinite 1‐D chain structure 12b. The formation of group 2 complexes of Tm Me has recently been reported by Ziegler 46c.…”

Hexaaquamanganese(II) bis[hydrotris(3-methyl-2-thioxo-1-imidazolyl) borate] Tetrahydrate: A Non-coordinating Borate Ligand with Manganese(II) Metal Ion

“…The molecular structure consists of metal atom in the hexaaqua-coordinated cations lie on center of inversion in octahedral coordination geometry with Mn-O bond lengths in the range of 2.139 (2)-2.212 (2) Å, but the anion has no coordinative interaction with the manganese cation. This rare transition metal compound is placed in the context of previously reported similar Group 2 metal compounds that emphasizes its peculiarity [8]. The molecular structure has not a planar conformation.…”

“…The metal coordination properties of the ligand reveals that it reacts with Group 2 metals in which the borate acts as non-coordinating species [8] whereas with transition metals such as mercury it forms a 1:1 metal complex [9] or metal cluster complex [10]. Reglinski et al [11] have reported a wide variety of complexes with both transition and main group metal with soft donor ligands.…”

Benzannulated tris(2-mercapto-1-imidazolyl)hydroborato ligands: tetradentate κ4-S3H binding and access to monomeric monovalent thallium in an [S3] coordination environment

“…Although there are relatively few structurally characterized [Tm R ]M alkali metal derivatives, 1b,8,13,14 it is evident that there exists a variety of structural types, which are influenced by the composition of the crystal. For example, (i) the aqua complex [Tm Me ]Na•4.5H 2 O is composed of discrete [Tm Me ] − anions ( i.e.…”

“…14 It is, therefore, significant that we have also determined the molecular structure of the potassium complex, [Tm MeBenz ]K(OCMe 2 ) 3 , (Figure 4) which may be synthesized via the reaction of KBH 4 with three equivalents of 1-methyl-1,3-dihydro-2 H -benzimidazole-2-thione in THF, followed by crystallization from acetone (Scheme 1). …”