Phase transition of 4'-n-hexacosloxy-3'-nitrobiphenyl-4-carboxylic acid (ANBC-26): two types of thermotropic cubic phases

Article Abstract:

Differential scanning calorimetric (DSC), polarizing optical microscopic, and X-ray diffraction (XRD) measurements are used to investigate the phase transitions of 4'-n-hexacosyloxy-3'-nitrobiphenyl-4-carboxylic acid (ANBC-26, where "26'indicates the number of carbon atoms in the alkoxy group). Two types of three-dimensionally ordered cubic mesophases on heating, the low -temperature cubic (CubI) phase having a space group of Im3m, and the high -temperature one (CubII phase) is of Ia3d type, is exhibited.

Analysis, Thermal properties, Carboxylic acids, Transition temperature, Phenyl group, Phase transition temperatures

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A two-step spin transition with a disordered intermediate state in a new two-dimensional coordination polymer

Article Abstract:

Several magnetic, heat capacity and X-ray diffraction measurements are used and carried out to study the synthesis of a two-dimensional polymeric spin crossover (SCO) coordination polymer, which exhibits a two-step spin transition. The analysis shows that a decrease in the temperature results in an increase of the thermal factor, which in combination with the absence of a superstructure peaks in the diffraction pattern leads to the observed two steps disorder.

Polymers, Coordination compounds

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Influence of added electrolytes on the lyotropic phase behavior of triethylammoniodecyloxycyanobiphenyl bromide (OCB-C(sub 10)NEt(sub 3)Br)

Article Abstract:

The influence of added electrolytes (NaBr, NaCl, Na2SO4, Na3PO4, Na2HPO4, NaSCN) on the lyotropic mesophase behavior of triethylammoniodecyloxycyanobipenyl bromide (OCB-C10NEt3) is studied by using the optical microscopy, X-ray diffraction, and NMR. The effects of the electrolytes are seen to follow the Hofmeister series and are attributed to adsorption or desorption of anions at the aggregate surface rather than to changes in 'water structure'.

Influence, Electrolytes, Bromides

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