Optical Properties and Electronic Structures of a Liquid Crystal TBO10A

Abstract:

A liquid crystal (LC) N,N-(terephthalylidene) bis (4-octyloxyaniline) (TBO10A) was synthesized at room temperature. The LC TBO10A were investigated by differential scanning calorimetry (DSC), polarizing optical microscopy (POM), ultraviolet-visible spectrophotometry, photoluminecence (PL) spectroscopy and electronic structure calculations. In tetrahydrofuran solutions, two optical absorption bands were recorded for TBO10A at about 298 and 379 nm, respectively. Under the 325 nm excitation, dilute tetrahydrofuran solutions of the TBO10A can give off weak blue PL. With Hückel tight-binding method, the electronic structures of the TBO10A were calculated. Our results demonstrated that two absorptions can be attributed to the π→π* and n → π* transitions in the rigid core of the TBO10A while the PL observed at about 481 nm (2.58 eV) can be assigned to the π* →n transition.

• Periodical: Solid State Phenomena (Volumes 181-182)
• Pages: 110-114
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.181-182.110
• Online since: November 2011
• Authors: Yuan Ming Huang, Qing Lan Ma, Bao Gai Zhai
• Keywords: Electronic Structure, Liquid Crystal, Optical Absorption, Photoluminescence (PL), Synthesis

References

[1] C. W. Tang and S. A. Vanslyke: Appl. Phys. Lett. Vol. 51 (1987), p.913.

[2] H. P. Hinov: Cryst. Res. Technol. Vol. 44 (2009), p.327.

[3] Q. –L. Ma and Y. M. Huang: Mater. Sci. Forum Vols. 663-429 (2011), p.771.

[4] Y. M. Huang and B. -G. Zhai: Mol. Cryst. Liq. Cryst. Vol. 510 (2009), p.214.

[5] Y. M. Huang, Q. -L. Ma and B. G. Zhai: Key Eng. Mater. Vols. 428-429 (2010), p.322.

[6] Y. M. Huang and B. -G. Zhai: Mol. Cryst. Liq. Cryst. Vol. 510 (2009), p.34.

[7] Q. –L. Ma, R. Xiong and Y. M. Huang: J. Lumin. Vol. 131 (2011), p. (2053).

[8] Y. M. Huang, Q. –L. Ma and B. -G. Zhai: Mater. Sci. Forum Vol. 663-665 (2011), p.812.

[9] Q. -L. Ma and Y. M. Huang: Key Eng. Mater. Vol. 428-429 (2010), p.345.

[10] M. Brandle and G. Calzaferri: Helv. Chim. Acta Vol. 76(1993), 924.

[11] R. H. Summerville and R. Hoffmann: J. Am. Chem. Soc. Vol. 98 (1976), p.7240.

[12] Y. M. Huang and B. -G. Zhai: Key Eng. Mater. Vol. 428-429 (2010), p.212.

[13] D. Demus: Flussige Kristalle in Tabellen, VEB Deutscher Verlag fur Grundstoffindustrie, Leipzig Vol. 117 (1974), p.63.

DOI: 10.1002/zfch.19740140732

[14] E. P. Sokolova and A. N. Marinichev: Russian Gener. Chem. Vol. 79 (2009), p.16.

[15] B. -G. Zhai and Y. M. Huang: Key Eng. Mater. Vol. 428-429 (2010), p.475.

[16] Q. –L. Ma and Y. M. Huang: Key Eng. Mater. Vols. 428-429 (2010), p.228.