In 2019,Journal of Molecular Liquids included an article by Kanth, Priyanka; Singh, Hemant Kumar; Kumar, Vijay; Singh, Sachin Kumar; Rao, D. S. Shankar; Prasad, S. Krishna; Singh, Bachcha. Recommanded Product: 26153-38-8. The article was titled 《Effect of regioisomerism on the self-assembly, photophysical and gelation behavior of aroylhydrazone based polycatenars: Synthesis and characterization》. The information in the text is summarized as follows:
The five series of aroylhydrazone based polycatenars differing from each other in number and position of alkoxy chains on one end of the core; keeping other end the same was reported. A systematic variation in the structures was carried out to understand the effect of position and chain length on the mesophase behavior. In the case of single alkoxy chain at 4-position, there was a transition from Smectic C to Smectic A mesophase during cooling and Smectic A to Smectic C transition in heating cycle in all the homologues except n = 6 & n = 8. In the case of two alkoxy chains at 3-, 5-positions, the compounds were non-mesogenic in nature. On changing the position of alkoxy chains from 3-, 5-positions to 3-, 4-positions, intermol. forces weaken and these compounds become liquid crystalline and show columnar rectangular mesophase resulting from the effect of regioisomerism. Moving on to the series with three alkoxy chains, it was observed that 2-, 3-, 4-trialkoxy substituted compounds exhibited columnar rectangular mesophase except lower chain length (n = 6 & 8) while 3-, 4-, 5-trialkoxy substituted aroylhydrazones showed columnar rectangular mesophase; except n = 10 which showed columnar oblique mesophase. Thus it was established that on increasing d. of alkoxy chains around one terminal, mesophase changes from smectic to columnar mesophase. Temperature dependent Raman studies confirmed the presence of intermol. hydrogen bonding. Further, effect of substitution pattern did not show much influence on the photophys. properties of the mesogenic series in solid and solution state. However, the non-mesogenic series showed a different absorption and emission transition from the mesogenic series in solid and solution state. Solid state fluorescence studies showed almost similar emission maxima in all the series. However, it was also noticed that non-mesogenic series showed maximum red shift emission maxima in solid state as compared to that of solution All the series showed good gelation properties with less than 1% CGC (wt%) suggesting the strong ability of mols. to form gel. These H-bonded liquid-crystalline gels have immense potential for applications in emissive displays. In the part of experimental materials, we found many familiar compounds, such as 3,5-Dihydroxybenzaldehyde(cas: 26153-38-8Recommanded Product: 26153-38-8)
3,5-Dihydroxybenzaldehyde(cas: 26153-38-8) is used as a building block in the synthesis of more complex structures. It is also used in the synthesis of terbutaline, which is an important bronchodilator.Recommanded Product: 26153-38-8
Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts