Awaluddin, Amir and DeGuzman, Roberto N. and Kumar, Challa V. and Suib, Steven L. and Burkett, Sandra L. and Davis, Mark E. (1995) Quenching of Tris(2,2'-bipyridine)ruthenium(II) Luminescence by Cobalt(III) Polypyridyl Complexes in Different Sites in and on Clays. Journal of Physical Chemistry, 99 (24). pp. 9886-9892. ISSN 0022-3654. doi:10.1021/j100024a034. https://resolver.caltech.edu/CaltechAUTHORS:20180525-130634948
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Abstract
The effect of quenching of tris(2,2'-bipyridine)ruthenium(II) [Ru(bpy)_3^(2+)] luminescence by Co(phen)_3^(3+) in various locations in and on bentolite-H clay has been investigated. Ru(bpy)_3^(2+) incorporated into the interlayer region of bentolite-H by ion exchange exhibited spectral properties that were distinct from the Ru(bpy)_3^(2+) incorporated by incipient wetness methods. For example, the samples showed different diffraction, luminescence emission, and lifetime decays. The method of preparation, the nature of counterion (chloride or cyanide), and the presence of a quencher [Co(phen)_3^(3+) influence the emission properties. For example, incipient wetness methods allow deposition on outer surfaces (OUT) of the clay whereas ion-exchange leads to deposition primarily in the interlayer spacing (IN) based on spectroscopic and diffraction data. The luminescence intensities and lifetimes decrease in the order Ru(0UT) > Ru(IN) > Ru(OUT)/Co(IN) > Ru(IN)/Co(0UT) > Ru(OUT)/Co(OUT) ≃ Ru(IN)/Co(IN). Different methods of preparation and treatment result in location of Ru(bpy)_3^(2+) at different internal or external sites in the clay which give different luminescence and lifetime properties. By controlling the locations of Ru(II) and Co(III) (inside or outside), the quenching rates could be modulated. The location of the Ru(II) complex seems to control both the photophysical properties and the efficiency and rate of quenching by Co(III). The Ru(IN) and Co(IN) sample is very similar to the Ru(OUT) and Co(OUT) sample. These two samples are considerably different from the Ru(IN)/Co(OUT) sample and the Ru(OUT)/Co(IN) sample.
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Additional Information: | © 1995 American Chemical Society. Received: September 30, 1994; In Final Form: March 22, 1995. The support of the National Science Foundation under Grant CBT 88/4974 is gratefully acknowledged. We thank Professor Harry B. Gray for helpful discussions. | ||||||
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Issue or Number: | 24 | ||||||
DOI: | 10.1021/j100024a034 | ||||||
Record Number: | CaltechAUTHORS:20180525-130634948 | ||||||
Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20180525-130634948 | ||||||
Official Citation: | Quenching of Tris(2,2'-bipyridine)ruthenium(II) Luminescence by Cobalt(III) Polypyridyl Complexes in Different Sites in and on Clays Amir Awaluddin, Roberto N. DeGuzman, Challa V. Kumar, Steven L. Suib, Sandra L. Burkett, and Mark E. Davis The Journal of Physical Chemistry 1995 99 (24), 9886-9892 DOI: 10.1021/j100024a034 | ||||||
Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||
ID Code: | 86630 | ||||||
Collection: | CaltechAUTHORS | ||||||
Deposited By: | George Porter | ||||||
Deposited On: | 25 May 2018 20:33 | ||||||
Last Modified: | 15 Nov 2021 20:40 |
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