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Luminescence Spectroscopy of Rhodamine Homodimer Dications in Vacuo Reveals Strong Dye-Dye Interactions
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Number of Authors: 122019 (English)In: ChemPhysChem, ISSN 1439-4235, E-ISSN 1439-7641, Vol. 20, no 4, p. 533-537Article in journal (Refereed) Published
Abstract [en]

Being alone or together makes a difference for the photophysics of dyes but for ionic dyes it is difficult to quantify the interactions due to solvent screening and nearby counter ions. Gas-phase luminescence experiments are desirable and now possible based on recent developments in mass spectrometry. Here we present results on tailor-made rhodamine homodimers where two dye cations are separated by methylene linkers, (CH2)(n). In solution the fluorescence is almost identical to that from the monomer whereas the emission from bare cation dimers redshifts with decreasing n. In the absence of screening, the electric field from the charge on one dye is strong enough to polarize the other dye, both in the ground state and in the excited state. An electrostatic model based on symmetric dye responses (equal induced-dipole moments in ground state) captures the underlying physics and demonstrates interaction even at large distances. Our results have possible implications for gas-phase Forster Resonance Energy Transfer.

Place, publisher, year, edition, pages
2019. Vol. 20, no 4, p. 533-537
Keywords [en]
Gas-phase luminescence, Rhodamine, Dimers, Stark shift, Mass spectroscopy
National Category
Chemical Sciences Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-166702DOI: 10.1002/cphc.201800933ISI: 000458952600006PubMedID: 30576051OAI: oai:DiVA.org:su-166702DiVA, id: diva2:1297319
Available from: 2019-03-19 Created: 2019-03-19 Last updated: 2019-03-19Bibliographically approved

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Stockett, Mark H.Laursen, Bo W.
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