cg200681s_si_002.cif (10.53 kB)
Crystal Structure, Thermal Behavior, and Photochemical Reactivity of a Series of Co-Crystals of trans-1,2-Bis(4-pyridyl) Ethylene with Dicarboxylic Acids
dataset
posted on 2012-05-02, 00:00 authored by Kostas Tsaggeos, Natalia Masiera, Aleksandra Niwicka, Vassiliki Dokorou, Michael G. Siskos, Stavroula Skoulika, Adonis MichaelidesA 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 CC 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 CC bond of the acid and that of bpe was also induced
when L = trans,trans-muconic acid.