A series of bent-core derivatives of 6-oxoverdazyl 1[12] was synthesized and mesogenic properties were investigated in the pure form and in binary mixtures. Results demonstrate that the effectiveness of the C(3) substituent in nematic phase stabilization follows the order: COOMe > m-FC 6 H 4 > Ph > thienyl > o-FC 6 H 4 , which is consistent with steric parameters established with DFT computational methods and opposite to the order of the appearance of a re-entrant isotropic phase. The effect of alkyl chain elongation on mesogenic properties and the effect of C(3) substituent on electronic absorption spectra are also investigated. Fig. 1 The structure of bent-core 6-oxoverdazyls 1[12]. † Electronic supplementary information (ESI) available: Complete synthetic details for intermediates 4-12, mixture analysis, partial output data for TD-DFT calculations, and archive of optimized equilibrium geometries for 12. See
A series of bent-core mesogens 2[m,n] derived from the 6-oxoverdazyl radical and containing partially fluorinated alkyl tails was prepared and investigated by thermal, optical, XRD and EPR methods.
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