Abstract
Connecting two columnar phase forming discotic mesogens via a short rigid spacer leads to the formation of a π-conjugated discotic dimer snowing discotic nematic (N D) phase. Attaching branched-alkyl chains directly to the core in hexaalkynylbenzene resulted in the stabilisation of ND phase at ambient temperature. Pentalkynylbenzene derivatives possessing a combination of normal- and branched-alkoxy chains display a very broad ND, phase which is stable well below and above the room temperature.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
S Chandrasekhar, B K Sadashiva and K A Suresh,Pramana — J. Phys. 9, 471 (1977)
A N Cammidge and R J Bushby, inHandbook of liquid crystals edited by D Demus, J Goodby, G W Gray, H-W Spiess and V Vill (Wiley-VCH, 1998) vol. 2B, ch. VII
K Praefcke,International conference on discotic liquid crystals (Trieste, Italy, November 25–29, 2002)
N Boden and B Movaghar, inHandbook of liquid crystals edited by D Demus, J Goodby, G W Gray, H-W Spiess and V Vill (Wiley-VCH, 1998) vol. 2B, ch. IX
S Chandrasekhar and S Kumar,Science Spectra 8, 66 (1997)
V S K Balagurusamy, S K Prasad, S Chandrasekhar, S Kumar, M Manickam and C V Yelamaggad,Pramana — J. Phys. 53, 3 (1999)
D Adam, P Schuhmacher, J Simmerer, L Häussling, K Siemensmeyer, K H Etzbach, H Ringsdorf and D Haarer,Nature 371, 141 (1994)
J Simmerer, B Glusen, W Paulus, A Kettner, P Schuhmacher, D Adam, K H Etzbach, K Siemensmeyer, J H Wendorff, H Ringsdorf and D Haarer,Adv. Mater. 8, 815 (1996)
I I I Stapff, V Stumpften, J H Wendorff, D B Spohn and D Mobius,Liq. Cryst. 23, 613 (1997)
S Marguet, D Markovitsi, P Millie, H Sigal and S Kumar,J. Phys. Chem. B102, 4697 (1998)
L Schmidt-Mende, A Fechtenkotter, K Mullen, E Moons, R H Friend and J D Mackenzie,Science 293, 1119 (2001)
D Markovitsi, S Marguet, J Bondkowski and S Kumar,J. Phys. Chem. B105, 1299 (2001)
I Seguy, P Destruel and H Bock,Synth. Met. 111–112, 15 (2000)
H Mori, Y Itoh, Y Nishuira, T Nakamura, Y Shinagawa,Jpn. J. Appl. Phys. 36, 143 (1997)
K Kawata,The chemical record 2, 59 (2002)
S Chandrasekhar, S Krishna Prasad, G G Nair, D S Shankar Rao, S Kumar and M Manickam,EuroDisplay ’99, The 19th International Display Research Conference Late-News Papers (Berlin, Germany, 1999) p. 9
C P Lillya and Y L N Murthy,Mol. Cryst. Liq. Cryst. 2, 121 (1985)
S Kumar, M Manickam and H Schonherr,Liq. Cryst. 26, 1567 (1999)
N Boden, R J Bushby and A N Cammidge,J. Am. Chem. Soc. 117, 924 (1995)
S Kumar and S K Varshney,Org. Lett. 4, 157 (2002)
K Praefcke, inPhysical properties of liquid crystals: nematics edited by D Dunmur, A Fukuda and G Luckhurst (INSPEC, London, 2001) p. 17
P G Schouten, J F van der Pol, J W Zwikker, W Drenth and S J Picken,Mol. Cryst. Liq. Cryst. 195, 291 (1991)
K Ohta, Y Morizumi, H Erna, T Fujimoto and I Yamamoto,Mol. Cryst. Liq. Cryst. 208, 55 (1991)
D M Collard and C P Lillya,J. Am. Chem. Soc. 113, 8577 (1991)
S Kumar, D S Shankar Rao and S K Prasad,J. Mater. Chem. 9, 2751 (1999)
S Kumar, J J Naidu and D S Shankar Rao,J. Mater. Chem. 12, 1335 (2002)
S Kumar and S K Varshney,Liq. Cryst. 28, 161 (2001)
T J Phillips, J C Jones and D G McDonnell,Liq. Cryst. 15, 203 (1993)
P Hindmarsh, M J Watson, M Hird and J W Goodby,J. Mater. Chem. 5, 2111 (1995)
S Kumar and S K Varshney,Angew. Chem. Int. Ed. 39, 3140 (2000)
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Kumar, S. Molecularengineering of discotic nematic liquid crystals . Pramana - J Phys 61, 199–203 (2003). https://doi.org/10.1007/BF02708302
Issue Date:
DOI: https://doi.org/10.1007/BF02708302