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Articles by M. G. Tamba
Total Records ( 1 ) for M. G. Tamba
  G. Pelzl , S. Diele , M. W. Schroder , W. Weissflog , M. G. Tamba and U. Baumeister
  Twelve new five-ring bent-core compounds have been synthesised which are derived from 2-nitroresorcinol and which contain only ester linkage groups. Their mesophase behaviour was investigated by polarising microscopy, X-ray diffraction and electro-optical measurements. It was found that most of the compounds studied form a B7 phase. For several compounds, a phase transition between a B7 high-temperature phase (B7H) and a B7 low-temperature phase (B7L) was clearly detected by calorimetry, by a small change of the texture and by X-ray diffraction measurements. For one compound, (A12), well-aligned samples were obtained which allowed a more detailed structural characterisation of the B7 phases. Interestingly, by fast cooling of the isotropic liquid, the same compound forms a metastable columnar phase. Furthermore, the binary system composed of the compound A12 and a member of the B7 parent series was investigated. X-ray diffraction measurements give evidence that the B7 phases of both mixing components are completely miscible, i.e. they belong to the same phase type.
 
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