Journal article
Surface and intercalate chemistry of the layered silicates. Part VI. Tetrahydrofuran intercalates of a series of cation-exchanged montmorillonites
Dalton Transactions, (2), pp 112-115
1976
Abstract
Intercalates of tetrahydrofuran (THF) with nine distinct cation-exchanged montmorillonites have been prepared and may be divided into two classes depending upon the magnitude of the basal spacing,
d
001
. In one class (with NH
4
+
, Na
+
, Co
2+
, Ni
2+
, and Cu
2+
)
d
001
lies close to 14.6 Å; in the other (with Ca
2+
, Sr
2+
and Ba
2+
) the spacing is close to 19.0 Å, while Li
+
-exchanged montmorillonites are capable of forming both types of intercalate. The orientation and position of the organic molecules for six of the intercalates (NH
4
+
, Na
+
, Co
2+
, Ni
2+
, Cu
2+
, and Sr
2+
) have been determined form one-dimensional electron density maps constructed from the results of
X
-ray diffraction measurements. The lower-spacing intercalates have one layer of organic molecules in the interlamellar region with the THF perpendicular to the sheets. The number of THF molecules per formula unit [idealised, Al
4
Si
8
O
20
(OH)
4
] ranges from 1.3 (NH
4
+
) to 2.3 (Ni
2+
), the corresponding figures per exchanged cation being 2.6 (NH
4
+
) to 9.4 (Ni
2+
). The higher spacing intercalates have a double layer of THF molecules inclined at
ca
. 55° to the sheets. There are, for example, 4.8 molecules per formula unit of the Sr
2+
-exchanged clay. Electron spectroscopy demonstrates that the copper-exchanged clay and intercalate change from Cu
2+
to Cu
+
under the influence of the incident, low energy,
X
-rays.
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2 citations in Scopus
Details
- Title
- Surface and intercalate chemistry of the layered silicates. Part VI. Tetrahydrofuran intercalates of a series of cation-exchanged montmorillonites
- Creators
- John M AdamsJohn M ThomasMichael J Walters
- Publication Details
- Dalton Transactions, (2), pp 112-115
- Publisher
- Royal Society of Chemistry
- Number of pages
- 4
- Resource Type
- Journal article
- Academic Unit
- Chemical and Biological Engineering
- Scopus ID
- 2-s2.0-37049094875
- Other Identifier
- 991020950597804721