Determination of Absolute Orientations of Hemicyanine Dyes Incorporated into the Channels of Silicalite-1 Films

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• 作者：Haesik Min ; Yoonnam Jeon ; Jaeho Sung ; Sangjun Seok ; Doseok Kim ; Hyunsung Kim ; Kyung Byung Yoon
• 刊名：Journal of Physical Chemistry C
• 出版年：2007
• 出版时间：December 13, 2007
• 年：2007
• 卷：111
• 期：49
• 页码：18159 - 18163
• 全文大小：123K
• 年卷期：v.111,no.49(December 13, 2007)
• ISSN：1932-7455

文摘

Hemicyanine dyes can be incorporated into silicalite-1 channels in uniform orientations.¹ To find out theunderlying mechanism, two different hemicyanine dyes having a long hydrophobic C₁₈-alkyl chain on oppositeends of the dipolar nonlinear optical chromophore were adsorbed into the vertically oriented channels ofsilicalite-1 films supported on a glass plate. Second-harmonic phase measurement revealed that the abovetwo molecules in the silicalite-1 channels were indeed oppositely oriented. A Langmuir monolayer of ahemicyanine was used as a reference sample to determine the absolute orientation of the dyes in the abovesamples, which allowed us to confirm that the hemicyanine dyes prefer to enter the zeolite channels with thehydrophobic tail part first.