Spectroscopic characterization of aggregates of squaric acid and squaric acid bipyridine incorporated within basic zeolites

被引：4

作者：

Casades, I

Fornés, V

Gigante, B

García, H

机构：

[1] Univ Politecn Valencia, UPV, CSIC, Inst Tecnol Quim, E-46071 Valencia, Spain

[2] INETI, IBQTA, Dept Tecnol Ind Quim, P-1699 Lisbon, Portugal

来源：

CHEMICAL PHYSICS LETTERS | 1999年 / 305卷 / 5-6期

关键词：

D O I：

10.1016/S0009-2614(99)00406-6

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：

Adsorption of squaric acid (SQH(2)) (pKas 1.4 and 3.5) in basic NaY, CsY and NaMor zeolites results in the coloration of the solids and the appearance of a broad band (lambda(max) 470 nm) that is not observed in acid or basic aqueous solutions of SQH(2). This band in the visible does not appear when SQH(2) is incorporated in acid HMor and HY zeolites. FT-LR shows that the species responsible for the color is ionized squarate. Analogously, the charge-transfer complex of SQH(2) and bipyridine (BPY) has been characterized within zeolites. This complex has only been previously observed in SQH(2)/BPY single crystals. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：365 / 369

页数：5

共 22 条

[1] Charge transfer complexes between methylviologen and aromatic donors within faujasite Y: Influence of the alkaline metal counter cations [J].