Effect of Interface on the Orientation of the Liquid Crystalline Nickel Phthalocyanine Films

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• 作者：Tamara V. Basova ; Mahmut Durmu ; Aye Gl Grek ; Vefa Ahsen ; Aseel Hassan
• 刊名：Journal of Physical Chemistry C
• 出版年：2009
• 出版时间：November 5, 2009
• 年：2009
• 卷：113
• 期：44
• 页码：19251-19257
• 全文大小：305K
• 年卷期：v.113,no.44(November 5, 2009)
• ISSN：1932-7455

文摘

In this paper, the effect of interface on the orientation of the film of two derivatives of tetra-substituted nickel phthalocyanines NiPcR₄-1 (R = −OCH(CH₂OC₁₂H₂₅)₂) and NiPcR₄-2 (R = −SCH(CH₂(OCH₂CH₂)₂OC₂H₅)₂) deposited on one substrate and between two identical substrates is studied by the method of polarized Raman spectroscopy. The methods of ultraviolet−visible (UV−vis) absorption spectroscopy and infrared (IR) spectroscopy were also used for the characterization of films deposited on quartz and KBr substrates, respectively. The orientation of columns in films confined between two substrates is characterized by polarized optical microscopy. It has been shown that the films of both compounds confined between two substrates are characterized by homeotropic alignment while no homeotropic alignments could be obtained with an air interface. The orientation is also independent of the type of substituents on the phthalocyanine ring.