PHOTOPHYSICAL PROBES FOR MONITORING THE ELECTRIC-FIELD MICROPOLARITY WITHIN THE FAUJASITE SUPERCAGE

被引:44
作者
RAMAMURTHY, V
SANDERSON, DR
EATON, DF
机构
[1] Central Research and Development, Du Pont Company, Wilmington, Delaware, 19880-0328, Experimental Station
关键词
D O I
10.1111/j.1751-1097.1992.tb02163.x
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The micropolarity of the supercages of zeolites is a reflection of the electric field provided by the cations present within them. The notion of polarity within the cages of X and Y zeolite does not have precisely the same meaning as in solution. In this study, pyrene, pyrenealdehyde, and para-dimethylaminobenzonitrile have been used as photophysical probes to monitor the polarity of the zeolite interior. With pyrenealdehyde and para-dimethylaminobenzonitrile the supercage wherein the probe is expected to reside is more polar or possesses a higher electric field when the cation is Li or Na. The polarity/electric field of the supercage decreases with cation size (Li > Na > K > Rb > Cs) and the supercage is more polar in the case of X zeolites than in Y zeolites. The results with pyrene are generally consistent with those with the other two probes. However, pyrene is unable to sense the difference between Li, Na and other cations.
引用
收藏
页码:297 / 303
页数:7
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