Absorption flattening as one cause of distortion of circular dichroism spectra of Δ-RuPhen3 · H2TPPS complex
✍ Scribed by Ettore Castiglioni; Sergio Abbate; Giovanna Longhi; Roberto Gangemi; Rosaria Lauceri; Roberto Purrello
- Publisher
- John Wiley and Sons
- Year
- 2007
- Tongue
- English
- Weight
- 242 KB
- Volume
- 19
- Category
- Article
- ISSN
- 0899-0042
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✦ Synopsis
Abstract
To extend the model that explains why and how much absorption flattening (AF) influences circular dichroism (CD) signals, we have investigated the interesting case of exciton CD in the Soret region of a noncovalent complex formed by (Δ‐RuPhen~3~)^2+^ and the tetraanionic porphyrin H~2~TPPS. Different concentrations have been studied by using an AF emulator and spectra simulation. The CD spectra of this compound occasionally show distortions in the solution sampling mode with the increase of concentration; the inhomogeneous distribution in the cell volume is due to aggregation and is the source of the AF effect. On the basis of these results, we conclude that AF is an important cause of distortions in CD spectra for Δ‐RuPhen~3~ · H~2~TPPS complexes and might affect the CD bands of other aggregated systems as well. Chirality 19:642–646, 2007 © 2007 Wiley‐Liss, Inc.