Modulation of fluorescence and color by cations

ORGN 382

Thorfinnur Gunnlaugsson, gunnlaut@tcd.ie1, Joseph Leonard1, Raman Parkesh1, Niamh Murray1, and Clive Lee2. (1) School of Chemistry, University of Dublin, Trinity College Dublin, Dublin 2, Ireland, College Green, Dublin, 2, Ireland, (2) Department of Anatomy, Royal College of Surgeons In Ireland, St. Stephen’s Green, Dublin 2, Ireland
There is considerable interest within the field of supra-molecular chemistry in the design of chemosensors for cation and anion recognition. In this regard several excellent examples of fluorescent and colorimetric sensors for cations have been developed. We have developed many examples of such systems where both the excited state and ground state properties of such sensors are modulated upon recognition of ions and molecules. In this lecture we demonstrate that by conjugating the same receptors (iminodiacetate) into various chromophores the nature of the recognition (eg luminescent vs. colorimetric) can be modulated as well as the selectivity and the sensitivity of the ion recognition. Hence, we demonstrate that while such naphthalimide based PET sensors give rise to highly selective fluorescent Zn(II) sensing, the use of anthracene gives rise to selective Cd(II) sensing, while incorporating the same receptor into an azobenzene chromophore, results in selective Cu(II) sensing.

 

Molecular Recognition and Self-Assembly
8:00 AM-12:00 PM, Tuesday, 12 September 2006 Moscone Center -- Room 132, Oral

Division of Organic Chemistry

The 232nd ACS National Meeting, San Francisco, CA, September 10-14, 2006