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Clays and Clay Minerals

, Volume 39, Issue 6, pp 580–585 | Cite as

X-Ray Diffraction Patterns of Montmorillonite Oriented Films Exchanged with Enantiomeric and Racemic Tris(2,2′-Bipyridyl)Ruthenium(II)

  • Gilles Villemure
Article

Abstract

X-ray diffraction patterns of oriented films of montmorillonite containing enantiomeric tris(2,2′-bipyridyl) ruthenium(II) chloride (Ru(bpy)22+) show a peak corresponding to basal spacings of approximately 27 Å. This peak is absent from the X-ray patterns of montmorillonite films containing racemic cations. A basal spacing of 27 Å is consistent with the adsorption of 2 layers of the enantiomeric cations in each interlayer space. Under the same condition only one layer of the raeemic cation was intercalated (basal spacings of 17.9 Å). These results are in accord with previous reports that montmorillonite can adsorb more of the optical isomers than of the racemic mixture of Ru(bpy)32+. Addition of NaCl to the mixtures resulted in an increase in the level of adsorption of the racemic cations and in the appearance of a peak at 27 Å in the X-ray pattern.

Key Words

Double layer Enantiomorphs Intercalation Monolayer Montmorillonite Surface area Tris(2,2′-bipyridyl)ruthenium(II) X-rays 

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References

  1. Cairns-Smith, A. G. (1982) Genetic Takeover and the Mineral Origins of Life: Cambridge University Press, Cambridge, 34–45.Google Scholar
  2. Dwyer, F. P. and Gyarfas, G. C. (1949) The chemistry of ruthenium. Part VII. The oxidation of D and L tris 2,2-dipyridyl ruthenium(II) iodide: J. Royal Soc. N.S. Wales 83, 173–175.Google Scholar
  3. Ghosh, P. K. and Bard, A. J. (1984) Photochemistry of tris(2,2′-bipyridyl)ruthenium(II) in colloidal clay suspensions: J. Phys. Chem. 88, 5519–5526.CrossRefGoogle Scholar
  4. Jackson, M. L., Wittig, L. D., and Pennington, R. P. (1949) Segregation procedure for the mineralogical analysis of soils: Soil Sci. Soc. Amer. Proc. 14, 77–81.CrossRefGoogle Scholar
  5. Jaynes, W. F. and Bigham, J. M. (1986) Multiple cationexchange capacity measurements on standard clays using a commercial mechanical extractor: Clays & Clay Minerals 34, 93–95.CrossRefGoogle Scholar
  6. Joshi, V. and Ghosh, P. K. (1989) Spectral evidence of spontaneous racemic and “pseudoracemic” interactions between optically active poly(pyridyl)metal chelates adsorbed on smectite clays: J. Amer. Chem. Soc. 111, 5604–5612.CrossRefGoogle Scholar
  7. Kalyanasundaram, K. (1982) Photophysics, photochemistry and solar energy conversion with tris (bipyridyl) ruthenium(II) and its analogues: Coord. Chem. Rev. 46, 159–244.CrossRefGoogle Scholar
  8. Thomas, J. K. (1988) Photophysical and photochemical processes on clay surfaces: Ace. Chem. Res. 21, 275–280.CrossRefGoogle Scholar
  9. Traynor, M. F., Mortland, M. M., and Pinnavaia, T. J. (1978) Ion exchange and intercalation reactions of hectorite with tris-bipyridyl metal complexes: Clays & Clay Minerals 26, 318–326.CrossRefGoogle Scholar
  10. Villemure, G. (1990) Effect of negative surface-charge densities of smectite clays on the adsorption isotherms of racemic and enantiomeric tris(2,2′-bipyridyl)ruthenium(II) chloride: Clays & Clay Minerals 38, 623–630.CrossRefGoogle Scholar
  11. Villemure, G. and Bard, A. J. (1990) Clay modified electrodes: 10. Studies of clay-adsorbed Ru(bpy)32+ enantiomers by UV-visible spectroscopy and cyclic voltametry: J. Electroanal. Chem. 283, 403–420.CrossRefGoogle Scholar
  12. Villemure, G., Kodama, H., and Detellier, C. (1985) Photoreduction of water by visible light in the presence of montmorillonite: Can. J. Chem. 63, 1139–1142.CrossRefGoogle Scholar
  13. Yamagishi, A. (1987) Optical resolution and asymmetric syntheses by use of adsorption on clay minerals: J. Coord. Chem. 16, 131–211.CrossRefGoogle Scholar
  14. Yamagishi, A. (1985) Racemic adsorption, antiracemization, and induction of optical activity of metal chelates in the presence of colloidal clay: Inorg. Chem. 24, 1689–1695.CrossRefGoogle Scholar
  15. Zhang, X. and Bard, A. J. (1989) In-trough cyclic voltametric studies of Langmuir-Blodgett monolayer of surfactant derivatives of Ru(bpy)32+ at an indium tin oxide electrode: J. Amer. Chem. Soc. 111, 8098–8105.CrossRefGoogle Scholar

Copyright information

© The Clay Minerals Society 1991

Authors and Affiliations

  • Gilles Villemure
    • 1
  1. 1.Department of ChemistryUniversity of New BrunswickFrederictonCanada

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