A critical review of the current understanding of elastically flexible molecular crystals is presented. A set of criteria are proposed to define an elastically flexible crystal, so that these materials may find applications among future technologies.
It has been previously proposed that pyridines can activate PhICl2 by displacing a chloride and forming the [PhI(Pyr)(Cl)]+ cation as a reactive intermediate. Here we show that pyridine does not...
The
understanding and control of proton transfer reactions between
acid–base pairs in the solid state are two of the main challenges
for the crystal engineering community. The ability to control proton
transfer reactions in the solid state enables a more selective preparation
of cocrystals and salts, which facilitates the design of solid materials
with specific physicochemical properties. In this study, an approach
to control proton transfer reactions of an E-butenedioic
acid/phthalazine cocrystal–salt (hybrid) system is presented,
which allows the selective formation of its cocrystal and salt. In
this approach the dominant intermolecular interactions between acid–base
pairs are identified. Such interactions appear to be crucial for the
inhibition or promotion of proton transfers in the solid state. For
this, the relationship between these interactions and the so-called
ΔpK
a rule has been investigated.
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