SPECIFIC CO-ABSORPTION OF PURINES AND PYRIMIDINES BY MONTMORILLONITE (CLAY-ORGANIC STUDIES 15)

被引:43
作者
LAILACH, GE
BRINDLEY, GW
机构
[1] Department of Geochemistry and Mineralogy, Materials Research Laboratory. The Pennsylvania State University, University Park, PA
关键词
D O I
10.1346/CCMN.1969.0170207
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
The co-absorptions of various purines and pyrimidines from aqueous solutions by Na- and Ca-montmorillonite are studied in the range of pH 1-6. The pyrimidines. thymine and uracil, which are not absorbed from solutions of these compounds alone, are appreciably absorbed from solutions containing also adenine or 2.6-diaminopurine, are weakly absorbed from solutions containing hypoxanthine, and are not absorbed from solutions containing purine, cytosine, and caffeine. The specific co-absorption is tentatively attributed to hydrogen-bond formation between the molecules in solution rather than to an overlapping of the molecular configurations (vertical stacking). The montmorillonite-organic associations have a basal spacing of about 12·5 Å which permits only a single molecular layer between successive silicate layers. © 1969.
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页码:95 / &
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