Wang, Xiaoxuan Li, Zhaoxia Zhao, Haiying Chen, Shufeng Detailed procedures of synthesis and characterization of compounds 2a - 2c, Fig. S1 - S6 (DSC curves no shown in text), Fig. S7 - S34 (NMR), Fig. S35 - S45 (HRMS). from New azobenzene liquid crystal with dihydropyrazole heterocycle and photoisomerization studies New azobenzene derivatives with dihydropyrazole heterocycle have been prepared and characterized. According to thermal polarizing microscopy and differential scanning calorimetry studies, the compounds consisting four linearly linked rings and a long alkoxy chain on the azobenzene side (<b>3a-8</b> and <b>3a-14</b>) displayed no liquid crystal properties. When the length of mesogenic unit increased to five rings, except for compound <b>5a-8</b>, all compounds from <b>5a-10</b> to <b>5a-16</b> containing a long chain of ten 10–16 carbon atoms on the side of ester group displayed liquid crystalline properties, and the mesogenic domain gradually narrowed with increase of the chain length. However, in the case of the molecular with long alkoxy chains on both sides, only <b>5c-16</b> with a long chain of sixteen carbon atoms exhibited liquid crystal behaviour. In addition, these azo compounds underwent isomerization from E to Z under ultraviolet irradiation and then thermal back relaxation slowly in the dark, which can be recycled many times. azobenzene;heterocycle;liquid crystal 2020-06-24
    https://rs.figshare.com/articles/journal_contribution/Detailed_procedures_of_synthesis_and_characterization_of_compounds_2a_-_2c_Fig_S1_-_S6_DSC_curves_no_shown_in_text_Fig_S7_-_S34_NMR_Fig_S35_-_S45_HRMS_from_New_azobenzene_liquid_crystal_with_dihydropyrazole_heterocycle_and_photoisomerizatio/12553616
10.6084/m9.figshare.12553616.v1