FT-IR spectroscopic investigation of adsorption of 3-aminopyridine on sepiolite and montmorillonite from Anatolia

The adsorption of 3-aminopyridine by natural sepiolite and montmorillonite from Eskisehir (Anatolia) was investigated in the temperature range from 20 to 125°C by infrared spectrometry using a variable temperature unit. The spectroscopic results indicate that the 3-aminopyridine molecules adsorbed o...

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Bibliographic Details
Published inJournal of molecular structure Vol. 565-566; pp. 487 - 491
Main Authors Akyüz, S., Akyüz, T., Yakar, A.E.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 30.05.2001
Subjects
Adsorption
Aminopyridine
FT-IR
Intercalation
Montmorillonite
Sepiolite
FT-IR
Adsorption
Montmorillonite
Intercalation
Aminopyridine
Sepiolite
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Summary:The adsorption of 3-aminopyridine by natural sepiolite and montmorillonite from Eskisehir (Anatolia) was investigated in the temperature range from 20 to 125°C by infrared spectrometry using a variable temperature unit. The spectroscopic results indicate that the 3-aminopyridine molecules adsorbed on sepiolite are coordinated to Lewis acidic sites and/or surface hydroxyls by H-bonding interaction through pyridine ring nitrogen lone pairs. Surface Bronsted acid strength of sepiolite is weak and 3-aminopyridinium is not detected under the conditions applied in this study. It must be noted that the adsorption of aminopyridine affected the hydroxyl group vibrations of sepiolite. The intercalation of 3-aminopyridine within montmorillonite has been shown by X-ray diffraction to increase the interlayer spacing. IR spectroscopy indicates that sorbed 3-aminopyridine molecules by montmorillonite are mostly coordinated to exchangeable cations directly or indirectly through water bridges. The formation of 3-aminopyridinium cation is also detected at elevated temperatures.
ISSN:0022-2860
1872-8014
DOI:10.1016/S0022-2860(00)00845-0