Title of article
Spectroscopic characterization of aggregates of squaric acid and squaric acid/bipyridine incorporated within basic zeolites
Author/Authors
Casades، نويسنده , , Isabel and Fornés، نويسنده , , Vicente and Gigante، نويسنده , , Barbara and Garc??a، نويسنده , , Hermenegildo، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 1999
Pages
5
From page
365
To page
369
Abstract
Adsorption of squaric acid (SQH2) (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 (λmax 470 nm) that is not observed in acid or basic aqueous solutions of SQH2. This band in the visible does not appear when SQH2 is incorporated in acid HMor and HY zeolites. FT-IR shows that the species responsible for the color is ionized squarate. Analogously, the charge-transfer complex of SQH2 and bipyridine (BPY) has been characterized within zeolites. This complex has only been previously observed in SQH2/BPY single crystals.
Journal title
Chemical Physics Letters
Serial Year
1999
Journal title
Chemical Physics Letters
Record number
1778090
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