Molecular crystal structure of acetylacetone at 210 and 110 K: is the crystal disorder static or dynamic?

Article Abstract:

The molecular and crystal structures of acetylacetone (AA) have been studied to gain an insight into the nature of hydrogen bonds and crystal disorders. A single crystal has been grown by in situ crystallization and x-ray diffraction studies were done at 21O K along with high-resolution studies at 110 K. Results reveal the intramolecular hydrogen bond in the simplest cis-enol molecule has two distinct potential minima with the central hydrogen atom equally distributed over two positions near the oxygens.

Molecular structure, Crystals, Crystal structure, Hydrogen bonding, Hydrogen bonds, Acetone, Order-disorder models

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Preparation of single-crystalline NdVO4 nanorods, and their emissions in the ultraviolet and blue under ultraviolet excitation

Article Abstract:

A facile sacrificial (NH4 )(sub 0.5)V2O5 nanowires that approach to single-crystalline NdVO4 nanorods are described. The Transmission electron microscopy (TEM) and selected area electron diffraction (SAED) show that the nanorods grew respectively along the [312] and [101] direction on the (NH4 )(sub 0.5)V2O5 nanowires.

Electric properties, Electron microscopy, Electrons, Electron diffraction

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Lamellar racemic twinning as an obstacle for the resolution of enantiomers by crystallization: the case of Me (AII) N+ (CH2Ph) Ph X- (X = Br, I) salts

Article Abstract:

Lamellar racemic twinning of chiral ammonium salts X=Br and X=I are found and investigated. The enantiomeric composition of the majority of the crystals obtained by crystallization from solutions of racemates, despite the chiral space group, is discovered to be racemic.

Crystallization, Chemical properties

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