Thermal expansion of an organic salt, prepared by solvent-drop grinding of terephthalic acid and imidazole in a 1:2 ratio, has been studied over a wide range of temperature 100–430 K. Restricted motion of the components in the hydrogen-bonded network resembles a fence-like structure led to a uniaxial negative thermal expansion (NTE). Interestingly, N–H···O hydrogen bonding distances remain almost unchanged over the temperature of study. Large transverse vibration of atoms involved in the hydrogen bonding plays an unprecedented role to keep the distances constant.

Variable temperature single crystal X-ray diffraction (VT-SCXRD) study reveals the unusual thermal expansion behaviour of two new co-crystals prepared by solvent drop grinding using flexible ligand [1,4-bis[(2-methylimidazol-1-yl)methyl]benzene] (BIMB) and aromatic...

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Separation of xylene isomers from its mixture is a challenging task. Present study describes highly selective inclusion of p-xylene (now onwards p-XY) from a mixture of xylene isomers by three...

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