Crystal Structure, Thermal Behavior, and Photochemical Reactivity of a Series of Co-Crystals of trans-1,2-Bis(4-pyridyl) Ethylene with Dicarboxylic Acids
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Crystal Structure, Thermal Behavior, and Photochemical Reactivity of a Series of Co-Crystals of trans-1,2-Bis(4-pyridyl) Ethylene with Dicarboxylic Acids
(EN)
Tsaggeos, K.
(EN)
Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας
(EL)
Tsaggeos, K.
(EN)
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 Å 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.
(EN)
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