- Preparation and characterization of chromophor group containing cyclotriphosphazenes: III bis-azo chromophor carrying some cyclotriphosphazenes
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Some new substituted cyclotriphosphazenes were prepared by reaction of hexachlorocyclotriphosphazene and phenylazophenylazophenol compounds such as p-[p-phenylazo-phenylazo]phenol, p-[p-(o-chlorophenylazo)phenylazo]phenol, p-[p-(p-chlorophenylazo)-phenylazo]phenol, p-[p-(p-methylphenylazo)phenylazo]phenol, and tetrazobenzene-β-naphtol. They are characterized by UV-Vis, FT IR, elemental analysis, and TG, DTG, and DTA.
- Odabasoglu, Mustafa,Cakmak, Suekriye,Turgut, Guenseli,Icbudak, Hasan
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- Novel non-symmetric liquid crystal dimer containing bisazobenzene moieties: Synthesis and characterization
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A new series of calamitic liquid crystalline non-symmetric dimer containing bisazobenzene moiety and a rather short alkoxybiphenyl linked by flexible spacers (4-propyloxy-[4-biphenyloxyalkyl]-4′-(4-phenylazo)azobenzene has been designed, synthesized and characterized by spectroscopic methods. The transition temperatures and phase behaviors were studied by differential scanning calorimetry (DSC), polarizing optical microscopy (POM) and X-ray diffraction (XRD) analyses. All the synthesized compounds exhibited enantiotropic phase with dimers containing propyl, butyl and octyl flexible alkyl spacers showing SmA and those with pentyl and hexyl spacers exhibited SmA and SmC phases respectively and the stability of the smectic layer depends on the spacer length for the compounds studied. Copyright Taylor & Francis Group, LLC.
- Salisu,Ab. Rahman,Silong,Bin Ahmad,Lutfor
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scheme or table
p. 134 - 144
(2011/08/07)
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- SYNTHESIS AND PROPERTIES OF SIDE-CHAIN LIQUID CRYSTALLINE POLYMERS CONTAINING AZOBENZENE MESOGENS
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The synthesis and phase behaviour of side-chain liquid crystalline polymers containing the trans-azobenzene mesogenic unit are described.Depending on the structure of the repeating unit, the polymers give rise to nematic mesophases and/or different smectic modifications.The liquid crystalline properties of the polymers are discussed with respect to the influence of the polymer backbone nature, chemical constitution and length of the spacer segment, and type and length of the para substituent on the azobenzene moiety.Indications on the UV absorption and photoisomerization behaviour of trans-azobenzene containing polymers are also provided.
- Angeloni, Annino Sante,Campagnari, Ilaria,Caretti, Daniele,Carlini, Carlo,Altomare, Angelina,et al.
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p. 171 - 178
(2007/10/02)
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