Planarization of the central paramagnetic unit facilitates the formation of an antiferroelectric B2 phase, exhibiting tri-stable electro-optical switching and photoconductivity.
A series of bent-core mesogens 2[m,n] and 3[4,6][6,n] derived from the 1,4-dihydrobenzo[e][1,2,4]triazin-4-yl radical and containing two partially fluorinated alkyl tails and the non-fluorinated derivative 1[12] were prepared and investigated by optical, thermal, XRD and magnetic methods.
A series of isomeric supermolecular bi-and tri-radicals, in which “half disc” mesogens are connected 1,4- and 1,3,5-through benzene, respectively, are investigated for liquid crystalline (optical, thermal and powder XRD methods)...
A new, 19 π-delocalized electrons planar Blatter radical building block was developed and used to obtain paramagnetic bent-core liquid crystals. The mesogens were investigated by optical, thermal, powder XRD and DFT methods in the pure form and as binary mixtures. Comparison of their properties with those of the classical Blatter radical analogues revealed that planarization of the central angular element results in a significantly higher stability of the mesophases and increased molecular organization suitable for the formation of ordered banana and columnar mesophases with tighter π-π interactions. These results indicate access to a new, potentially rich class of functional paramagnetic soft materials.
[closo-B10H8-1,10-(COOH)2]2- was obtained in five steps and 40% overall yield from [closo-B10H10]2-. It can converted to [closo-B10H8-1,10-(CO)2] and subsequently to carbonium ylides [closo-B10H8-1-COOH-10-(C(NRCH2)2)]. The diacid, its derivatives and also di-ylide...
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