CaltechAUTHORS
  A Caltech Library Service

Quenching of Tris(2,2'-bipyridine)ruthenium(II) Luminescence by Cobalt(III) Polypyridyl Complexes in Different Sites in and on Clays

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. https://resolver.caltech.edu/CaltechAUTHORS:20180525-130634948

Full text is not posted in this repository. Consult Related URLs below.

Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:20180525-130634948

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.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://dx.doi.org/10.1021/j100024a034DOIArticle
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.
Funders:
Funding AgencyGrant Number
NSFCBT-88/4974
Issue or Number:24
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:03 Oct 2019 19:46

Repository Staff Only: item control page