6228-62-2Relevant articles and documents
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.
