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Published in Soil Sci Soc Am J 31:459-463 (1967)
© 1967 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Infrared Studies of Hydroxy-Aluminum Interlayer Material1

R. A. Weismiller, J. L. Ahlrichs and J. L. White2

ABSTRACT

Differential infrared spectra of films of Al-montmorillonite matched with films of Al-montmorillonite with artificially introduced hydroxy-aluminum interlayers showed the interlayer to give absorption bands at 3,695 cm-1 and 3,570 cm-1 of nearly equal intensity. The pleochroism of the 3,695 cm-1 band indicated an orientation of many of the hydroxyls normal to the oxygen surface of the montmorillonite. The nonpleochroic nature of the 3,570 cm-1 band indicated an orientation at a moderate angle to the oxygen surface for the balance of the interlayer hydroxyls. A decrease in frequency from 3,695 cm-1 to 3,670 cm-1 and an increase from 3,570 cm-1 to 3,600 cm-1 upon drying can be explained by dehydration and by a closer association of the high frequency hydroxyls (3,695cm-1) with the oxygen surface of the clay. A single ring, six aluminum, polymer lying planar in the interlayer position would be expected to have the structural requirements to satisfy the observations in the 1.5:1 OH/Al interlayer system.

Key Words: montmorillonite • aluminum

NOTES

1 Contribution from the Dep. of Agronomy, Purdue Univ. Argi. Exp. Sta. (Journal Paper No. 2946), Lafayette, Ind. This study was supported by National Science Foundation Grant GP-1219.

2 Graduate Assistant, Associate Professor of Agronomy, and Professor of Agronomy, respectively.

Received for publication November 14, 1966. Accepted for publication January 27, 1967.






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