Adsorption characteristics and polymerization of pyrrole on Y-zeolites

被引：19

作者：

Matsumoto, A ^{[1
]}

Kitajima, T ^{[1
]}

Tsutsumi, K ^{[1
]}

机构：

[1] Toyohashi Univ Technol, Dept Mat Sci, Toyohashi, Aichi 4418580, Japan

来源：

LANGMUIR | 1999年 / 15卷 / 22期

关键词：

D O I：

10.1021/la990286p

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Adsorption characteristics and polymerization of pyrrole on Y-zeolites of different cation types (NaY, HY, and CuY) have been investigated in connection with adsorption behavior, in situ IR spectroscopy, and EPR spectroscopy. Adsorption of pyrrole on NaY is physisorption giving no significant-changes in IR and EPR spectra. In the adsorption on HY and CuY, the formation of pyrrole oligomers or polymers is observed. Pyrrole oligomer formed on HY is a nonconjugated one, which gives no EPR signal. In the case of CuY, EPR signal assigned to polaron of polypyrrole was observed at g = 2.008 by the pyrrole adsorption. The relationship between the amount of the spin of g = 2.008 and the adsorbed amount of pyrrole was linear even at the number of pyrrole exceeding that of Cu2+, which suggests that the polymerization giving conjugated polypyrrole would take place on Cu2+ sites and the polypyrrole of aromatic form would be oxidized to quinoid form to give polaron on CuY surface.

引用

页码：7626 / 7631

页数：6

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