Recommanded Product: 56621-48-8. The reaction of aromatic heterocyclic molecules with protons is called protonation. Aromatic heterocycles are more basic than benzene due to the participation of heteroatoms. Compound: 4-(Piperazin-1-yl)phenol, is researched, Molecular C10H14N2O, CAS is 56621-48-8, about Different nematic phases and a switchable SmCP phase formed by homologues of a new class of asymmetric bent-core mesogens. Author is Schroeder, Martin W.; Diele, Siegmar; Pelzl, Gerhard; Dunemann, Ulrike; Kresse, Horst; Weissflog, Wolfgang.
Ten homologues of a class of asym. bent-shaped liquid crystal compounds were synthesized by reaction of 4-(4-alkyloxy-benzoyloxy)benzoyl chlorides with N-(4-hydroxyphenyl)piperazine. The mesophase structure and transitions of the compounds were studied by polarizing microscopy, x-ray diffraction, dielec. and electro-optical measurements. The long-chain members of the series C8-C16 exhibit the switchable polar antiferroelec. smectic phase ( SmCP). The short-chain members, C4-C8, form a nematic phase. The homologues C5 and C6 show a transition from nematic to a low-temperature phase which is indicated by a sharp peak in the DSC trace. Whereas the texture of the phase points to a nematic-smectic transition, the x-ray studies definitely prove a structure without any long range (or quasi long range) positional order in the low-temperature phase. A mol. model is described which exhibits structural features similar to those of a nematic phase, which can be regarded as the precursor of the following columnar phase (B1 phase).
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Reference:
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