Han, Jie published the artcileThermotropic liquid crystals based on extended 2,5-disubstituted-1,3,4-oxadiazoles: structure-property relationships, variable-temperature powder X-ray diffraction, and small-angle X-ray scattering studies, Safety of 4-Iodobenzohydrazide, the publication is Chemistry – An Asian Journal (2006), 1(6), 814-825, database is CAplus and MEDLINE.
A class of extended 2,5-disubstituted-1,3,4-oxadiazoles R1-C6H4-{OC2N2}-C6H4-R2 (R1 = R2 = C10H21O 1a, p-C10H21O-C6H4-CC 3a, p-CH3O-C6H4-CC 3b; R1 = C10H21O, R2 = CH3O 1b, (CH3)2N 1c; F 1d; R1 = C10H21O-C6H4-CC, R2 = C10H21O 2a, CH3O 2b, (CH3)2N 2c, F 2d) were prepared, and their liquid-crystalline properties were examined In CH2Cl2 solution, these compounds displayed a room-temperature emission with λmax at 340-471 nm and quantum yields of 0.73-0.97. Compounds 1d, 2a-2d, and 3a exhibited various thermotropic mesophases (monotropic, enantiotropic nematic/smectic), which were examined by polarized-light optical microscopy and differential scanning calorimetry. Structure determination by a direct-space approach using simulated annealing or parallel tempering of the powder x-ray diffraction data revealed distinctive crystal-packing arrangements for mesogenic mols. 2b and 3a, leading to different nematic mesophase behavior, with 2b being monotropic and 3a enantiotropic in the narrow temperature range of 200-210°. The structural transitions associated with these crystalline solids and their mesophases were studied by variable-temperature x-ray diffractometry. Nondestructive phase transitions (crystal-to-crystal, crystal-to-mesophase, mesophase-to-liquid) were observed in the diffractograms of 1b, 1d, 2b, 2d, and 3a measured at 25-200°. Powder x-ray diffraction and small-angle x-ray scattering data revealed that the structure of the annealed solid residue 2b reverted to its original crystal/mol. packing when the isotropic liquid was cooled to room temperature Structure-property relationships within these mesomorphic solids are discussed in the context of their mol. structures and intermol. interactions. SOCl2.
Chemistry – An Asian Journal published new progress about 39115-95-2. 39115-95-2 belongs to iodides-buliding-blocks, auxiliary class Iodide,Hydrazine,Amine,Benzene,Hydrazide,Amide, name is 4-Iodobenzohydrazide, and the molecular formula is C7H7IN2O, Safety of 4-Iodobenzohydrazide.
Referemce:
https://en.wikipedia.org/wiki/Iodide,
Iodide – an overview | ScienceDirect Topics – ScienceDirect.com