Objective
Photoexcitation of biomimetic molecules, e.g. undergoing an electron transfer (ET) reaction or an isomerization, leads to optically well characterized intermediates. However, the phototransformation thermodynamic parameters, e.g. the enthalpy and entropy changes are not readily obtained. Laser-induced optoacoustic spectroscopy (LIOAS) is a suitable technique to study time-resolved thermodynamic profiles of photoreactions and has been successfully applied to molecular systems and biological photoreceptors. We plan to apply LIOAS to (1) carotene-porphyrin-acceptor 'supermolecules' (important in artificial photosynthesis), which on excitation produce relatively long-lived (hundreds of nanoseconds) charge separated states with large dipole moment changes and ( 2) closed-ring photoswitches which on excitation lead to long-lived (up to milliseconds) open states with smaller dipole moment changes. The measurements will be carried out with the molecules dissolved in a polar solvent incorporated into detergent micelles acting as nano-reactors, in turn suspended in aqueous medium. Varying the temperature permits separating the contributions from the heat and the structural volume change to the signal. The rates of the ET reactions are determined by the reorganization energy (a vibrational plus a solvent term). LIOAS measures the structural volume changes upon excitation, as a consequence of changes in bond lengths and angles plus interactions with the medium. The possible relationship between these volume changes and the Marcus reorganization energy will be analysed. The study of the photoswitches will allow the comparison between systems undergoing large and smaller dipole moment changes. These studies will also permit to solve methodological problems, e.g. the determination of the reaction quantum yields in the micelles by optical methods and the calibration of the size of the molecules that can be incorporated in the micelles without perturbing their physical properties.
Fields of science (EuroSciVoc)
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CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
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Keywords
Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Programme(s)
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Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Topic(s)
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Call for proposal
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Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
FP6-2004-MOBILITY-7
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Funding Scheme
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Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
IIF - Marie Curie actions-Incoming International Fellowships
Coordinator
Germany
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