A same coordination polymer [Zn(aip)(DMSO)] (aip: 5-aminoisophthalate and DMSO: dimethylsulfoxide) was synthesized using the same reactants (ZnSO4, aip and H2O/DMSO) but in different conditions, in which the stoichiometry (1:1-4:1 metal:ligand ratio), temperature (70 and 100 °C) and synthetic method (liquid-liquid diffusion, solvothermal and conventional with stirring) varied. A liquid assisted mechanochemical approach using ZnO as ZnII source instead ZnSO4, but keeping DMSO as milling liquid, also resulted in the same compound. This new coordination polymer was investigated using single-crystal X-ray diffraction technique, revealing a two-dimensional honeycomb-type network formation. The crystal structure was compared with either similar or isostructural compounds reported in the literature. Our studies show that the synthetic method and other synthetic variables do not affect the formation of [Zn(aip)(DMSO)] coordination polymers and probe the high stability (thermodynamic and kinetic) and structural invariance of this structure.

A 2-hidroxi-4,6-dimetoxiacetofenona foi isolada de folhas de Peperomia glabella (família Piperaceae). A substância cristaliza no grupo espacial P1 com duas moléculas na unidade assimétrica. A análise estrutural revela uma rede bidimensional infinita no plano (011), estabilizada por ligações de hidrogênio inter-moleculares ao longo da direção [100] e interações de van der Waals ao longo da direção [011]. As moléculas apresentam fortes ligações de hidrogênio intra-moleculares [O1-HO1...O4 = 1,53(2) Å e O5-HO5...O8 = 1,38(2) Å]. A conformação molecular foi analisada usando o MOGUL, uma base de dados de geometria molecular derivada do CSD (Cambridge Structural Database).

The 2-hydroxy-4,6-dimethoxyacetophenone was isolated from the leaves of the Peperomia glabella (Piperaceae family). The molecule crystallizes in the space group P1 with two independent molecules in the asymmetric unit. The structural analysis reveals an infinite two-dimensional network in the (011) plane, stabilized by intermolecular hydrogen bonds along [100] and van der Waals interactions along [011]. The molecules present strong intra-molecular hydrogen bonds [O1-HO1...O4 = 1.53(2) Å and O5-HO5...O8 = 1.38(2) Å]. The molecular conformation was analyzed using the MOGUL, a knowledge base of molecular geometry derived from the CSD (Cambridge Structural Database).

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 KBH4. Foram caracterizados por métodos espectroscópicos e análise elementar. As estruturas no estado sólido de KMt.4H2O e do composto 2 foram determinadas por análises de difração de raios-X. A maior maciez do ânion em KMt.4H2O, 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.4H2O 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 KBH4. They were characterized by spectroscopic methods and elemental analysis. Solid state structures of KMt.4H2O 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.4H2O 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.

Li(P3C2Bu t2) reage com BrCH(SiMe3)2, via adição oxidativa, formando um novo composto organofosforado de fórmula molecular P6C4Bu t4 CHSiMe3 (1). O composto 1 foi caracterizado espectroscopicamente e sua estrutura molecular determinada através de difração de raios X de monocristais. Juntamente com 1, foi caracterizado outro composto (2) com a mesma fórmula molecular, mas apresentando uma estrutura completamente saturada.

Reaction of Li(P3C2Bu t2 ) with BrCH(SiMe3)2 results in a novel organophosphorus compound with the formula, P6C4Bu t4 CHSiMe3 (1). Compound 1 was fully characterised spectroscopically and its unique molecular structure determined by single crystal X-ray diffraction. Another isomer (2) with a saturated structure was also fully characterised.