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Ftir Studies on Phase Transitions ofN-Octadecanoyl-L-Alanine and Zinc Octadecanoyl-L-Alaninate Lb Films

 

作者: Xuezhong Du,   Bo Shi,   Yingqiu Liang,  

 

期刊: Spectroscopy Letters  (Taylor Available online 1999)
卷期: Volume 32, issue 1  

页码: 1-16

 

ISSN:0038-7010

 

年代: 1999

 

DOI:10.1080/00387019909349962

 

出版商: Taylor & Francis Group

 

关键词: Variable temperature FTIR;N-Octadecanoyl-L-alanine;Zinc;Hydrogen bond;Phase transition

 

数据来源: Taylor

 

摘要:

The phase transitions ofN-octadecanoyl-L-alanine and zinc octadecanoyl-L-alaninate LB films have been investigated through variable temperature FTIR spectroscopy. Hydrogen-bonding interactions between the enantiomeric head-groups strengthens the interactions between the alkyl chains so that the transition temperature of theN-octadecanoyl-L-alanine LB film (Tc= 122 °C) is nearly twice as high as that of the same-chain-length stearic acid LB film (Tc= 65 °C). The intermolecular hydrogen-bonding interactions in the zinc octadecanoyl-L-alaninate LB film are greatly intensified in comparison to that in theN-octadecanoyl-L-alanine LB film; the relatively weak hydrogen-bonding interaction in the latter is easily disrupted around its transition temperature (Tc= 122 °C) together with an abrupt increase of va(CH2) stretching frequency, while the intensified intermolecular hydrogen-bonding interaction in the former weakens step by step with temperature along with a monotonic increase of va(CH2) stretching frequency, the zinc octadecanoyl-L-alaninate LB film thus exhibits a different phase behavior from the pure enantiomer LB film. Therefore, the strength of the intermolecular hydrogen bond is closely related to the interchain interaction and the film phase behavior.

 

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