6228-62-2Relevant academic research and scientific papers
Crystal structure, thermal behavior, and photochemical reactivity of a series of co-crystals of trans-1,2-bis(4-pyridyl) ethylene with dicarboxylic acids
Tsaggeos, Kostas,Masiera, Natalia,Niwicka, Aleksandra,Dokorou, Vassiliki,Siskos, Michael G.,Skoulika, Stavroula,Michaelides, Adonis
, p. 2187 - 2194 (2012)
A series of co-crystals of trans-1,2-bis(4-pyridyl) ethylene (bpe) with aliphatic saturated or unsaturated dicarboxylic acids, of the type [(bpe)(L)] (L = dicarboxylic acid), were prepared and characterized by single crystal X-ray crystallography. In all cases chains of the type acid???bpe? ??acid were formed via strong O-H???N hydrogen bonds. The chains were further linked between them by weak C-H???O hydrogen bonds, π-π and herringbone interactions to form three-dimensional structures. Thermal analysis showed considerable elevation of the melting/decomposition point of the co-crystals with respect either to both components or to bpe, ascribed to the formation of multiple complementary C-H???O bonds as well as to π-π interactions between the two conformer molecules. When L = fumaric acid, the two components stack separately with their C=C bonds strictly parallel between them at 3.83 A from one another. However, photodimerization reaction takes place only between the olefin bonds of bpe. Photodimerization reaction between one C=C bond of the acid and that of bpe was also induced when L = trans,trans-muconic acid.
Novel organotin complexes derived from 2,2′-selenodiacetic acid: Synthesis and biological evaluation
Li, Qianli,Liu, Xinglong,Cheng, Shuang,Zhang, Rufen,Shi, Yang,Ma, Chunlin
, p. 32484 - 32492 (2016/05/09)
The reactions of 2,2′-selenodiacetic acid and the corresponding organotin(iv) chloride with sodium ethoxide in ethanol, or via a solvothermal synthetic route, have afforded four organotin polymers, namely, [(Me3Sn)2Se(CH2COO)2]n (1), [(Me2Sn)2Se(CH2COO)2(μ3-O)]n (2), [(Bu3Sn)2Se(CH2COO)2]n (3), and [(Bu2Sn)Se(CH2COO)2]n (4). All the complexes were fully characterized by elemental analysis, FT-IR, NMR (1H, 13C, and 119Sn) spectroscopy and single crystal X-ray diffraction analysis. The structural analysis reveals that complex 1 is a 2D-polymer containing interconnected 24-membered (Sn4O8C10Se2) macrocyclic rings. Unlike complex 1, the 2D polymer structure of complex 2 is made up of the typical ladder tetraorganodistannoxane unit containing 32-membered (Sn4O8C16Se4) macrocyclic rings. Complex 3 is a 3D corrugated polymeric structure in which the deprotonated dicarboxylic acid acts as a tetradentate ligand by four oxygen atoms. Complex 4 is a 1D zigzag coordination polymer and the tin coordination geometry is described as skewed-trapezoidal bipyramidal. In particular, preliminary cytotoxic assessments of the involvement of complex 4 in the apoptotic death of MDA cells were conducted, and the results revealed that the antiproliferative and proapoptotic effect of complex 4 in MDA cells prominently contributed to the overload of intracellular ROS levels and the dysfunctional depolarization of mitochondrial membranes.
