A disk-like molecule, in which six α-linked terthiophenes are connected to a central benzene core via a thioether linkage, shows a sequence of calamitic liquid crystalline mesomorphism involving smectic C, smectic A and nematic phases.
References
1.
(a) AdamD., SchuhmacherP., SimmererJ., HäusslingL., SiemensmeyerK., EtzbachK. H., RingsdorfH., and HaarerD., Nature, 1994, 371, 141; (b) J. Simmerer, B. Glüsen, W. Paulus, A. Kettner, P. Schuhmacher, D. Adam, K.-H. Etzbach, K. Siemensmeyer, J. H. Wendorff, H. Ringsdorf and D. Haarer, Adv. Mater., 1996, 8, 815; (c) A. M. van de Craats, J. M. Warman, M. P. de Haas, D. Adam, J. Simmerer, D. Haarer and P. Schuhmacher, Adv. Mater., 1996, 8, 823; (d) C. F. van Nostrum, Adv. Mater., 1996, 8, 1027; (e) A. M. van de Craats, J. M. Warman, K. Müllen, Y. Geerts and J. D. Brand, Adv. Mater., 1998, 10, 36.
2.
(a) GamierF., YassarA., HajlaouiR., HorowitzG., DeloffreF., ServetB., RiesS., and AlnotP., J. Am. Chem. Soc., 1993, 115, 8716; (b) C. Taliani and L. M. Blinov, Adv. Mater., 1996, 8, 353.
3.
Recently the synthesis of similar, but non-mesogenic p-phenylene sulfide-based molecular asterisks was reported; GingrasM., PinchartA., and DallaireC., Angew. Chem., Int. Ed., 1998, 37, 3149.
4.
(a) BarbourR. H., FreerA. A., and MacNicolD. D., J. Chem. Soc., Chem. Commun., 1983, 362; (b) D. D. MacNicol, P. R. Mallinson, A. Murphy and G. J. Sym, Tetrahedron Lett., 1982, 23, 4131.
5.
MaB., and AllingerN. L., J. Mol. Struct., 1997, 413–414, 395, and references cited therein.
