LOW-TEMPERATURE STUDY OF RADICAL CATIONS OF QUADRICYCLANE AND NORBORNADIENE IN NA-ZSM-5 ZEOLITES

被引：22

作者：

CROMACK, KR

WERST, DW

BARNABAS, MV

TRIFUNAC, AD

机构：

来源：

CHEMICAL PHYSICS LETTERS | 1994年 / 218卷 / 5-6期

关键词：

D O I：

10.1016/0009-2614(94)00026-3

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We have observed quadricyclane and norbornadiene radical cations in different pentasil type zeolites by EPR spectroscopy after 4 K in situ electron beam irradiation of samples in the EPR spectrometer. We report the first evidence for matrix isolation of the quadricyclane radical cation. It is stable in polar Na-ZSM-5 zeolites below 20-30 K. Formation of the bicyclo[3.2.0]-hepta-2,6-diene radical cation is observed in both quadricyclane- and norbornadiene-loaded zeolites. The onset temperature for the formation of the bicyclo[3.2.0]hepta-2,6-diene radical cation depends on the substrate concentration and zeolite polarity and was as low as 30 K in polar zeolites when the substrate concentration was high.

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页码：485 / 491

页数：7

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