Abstract
The highly polar N-methyl iminodiacetic acid (MIDA) unit induces liquid crystalline self-assembly when the MIDA boronate is attached to conventional mono-, bis- or trisalkoxyphenyl mesogens. In order to understand the influence of the rigid mesogenic unit and the N-substituent on the mesomorphic properties six series of IDA boronates carrying N-ethyl in combination with classic mesogenic aryl units (Ph(n)kEIDA, n = 10 – 16, k = 1 – 3), or N-methyl in combination with bend meta-alkoxyphenyl (Ph(n)metaMIDA), linear alkoxy-pyridyl (Pyr(n)1MIDA) and -pyrimidinyl (Pym(n)1MIDA) respectively, were prepared. Analysis by differential scanning calorimetry (DSC), polarizing optical microscopy (POM) and X-ray diffraction (WAXS, SAXS) revealed that N-ethyl and bend-shaped aryl units mostly lowered the clearing transition temperatures, decreasing the tendency for thermal decomposition and affected the preference of SmA phases, while heterocyclic units were beneficial for stable SmA phases.
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