The University of Dublin | Trinity College -- Ollscoil Átha Cliath | Coláiste na Tríonóide
Trinity's Access to Research Archive
Home :: Log In :: Submit :: Alerts ::

School of Chemistry >
Chemistry >
Chemistry (Scholarly Publications) >

Please use this identifier to cite or link to this item:

Title: The role of metal ions and counterions in the switching behavior of a carboxylic acid functionalized spiropyran
Name Grant Number
PIYRA 07/YI2/I1052

Author's Homepage:
Keywords: Physical chemistry
1D coordination polymer
Absorption maxima
Binding constant
Issue Date: 2010
Publisher: Royal Society of Chemistry
Citation: Natali, M., Aakeröy, C., Desper, J., Giordani, S., The role of metal ions and counterions in the switching behavior of a carboxylic acid functionalized spiropyran, Dalton Transactions, 39, 35, 2010, 8269-8277
Series/Report no.: Dalton Transactions;
Abstract: The ability of a carboxylic acid functionalized spiropyran, SP, to act as a reversible and selective receptor for metal ions has been systematically examined. A series of spectroscopic measurements, combined with single-crystal X-ray diffraction have been employed in order to determine metal-ion sensitivity and selectivity, binding constants, solution compositions, binding kinetics as well as solid-state structure of a metal-complex of this ligand. This molecule acts as a chelating ligand and binds to metal ions using a triad of functionalities and will release the metal ion by application of visible light. Altering the complex from ZnCl2 and Zn(ClO4)2, leads to only a small change in the complex absorption maxima from 494 to 492 nm, but produced a drastic increase in the sensitivity for the zinc(ii) ion. Fluorescence spectroscopy was employed to establish that the detection limit for Zn(ii) is approximately 3 × 10-7 M for Zn(ClO 4)2. The counterion also influences binding constants and the equilibrium constants for Cu(ClO4)2 and CuCl 2 are K = 3.37 × 104 M-1 to K = 2.04 × 103 M-1, respectively. Additionally, in the presence of perchlorate, the spiropyran-Cu complex formation is fast enough to allow for real-time naked eye detection of this metal ion in less than three minutes; the formation of other metal complexes takes between 50 minutes to 2 hours. Finally, the single-crystal structure determination of the SP-zinc chloride complex shows that the Zn(ii) ion displays a distorted square-pyramidal arrangement, and neighbouring metal ions are bound together into a 1-D coordination polymer with a hydrophilic core, surrounded by hydrophobic 'cladding'
Description: PUBLISHED
Related links:
Appears in Collections:Chemistry (Scholarly Publications)

Files in This Item:

File Description SizeFormat
The role of metal ions.pdfPublished (publisher's copy) - Peer Reviewed579.76 kBAdobe PDFView/Open

This item is protected by original copyright

Please note: There is a known bug in some browsers that causes an error when a user tries to view large pdf file within the browser window. If you receive the message "The file is damaged and could not be repaired", please try one of the solutions linked below based on the browser you are using.

Items in TARA are protected by copyright, with all rights reserved, unless otherwise indicated.


Valid XHTML 1.0! DSpace Software Copyright © 2002-2010  Duraspace - Feedback