| 摘要 |
Light-collecting system, characterized in that it contains a coumarin derivative of the formula <IMAGE> (I) in which T designates O or NR4, wherein R4 represents hydrogen, optionally substituted alkyl or optionally substituted aryl; R1 designates a carbocyclic or heterocyclic, oxygen-free 5-membered or 6-membered ring which is linked via a C atom or a 5-membered or 6-membered heterocyclic ring which is linked via an N atom and which rotates unsymmetrically about an axis passing through the coumarin-N-heterocyclic ring linkage, it being possible for the 5-membered or 6-membered rings mentioned to carry non-ionic substituents and for an optionally substituted benzene ring or an optionally substituted naphthalene ring to be fused onto them; R2 designates hydrogen, alkyl, cycloalkyl, aralkyl or aryl, it being possible for the hydrocarbon radicals mentioned to be substituted, and R3 designates hydrogen, alkyl, cycloalkyl, aralkyl, aryl or a -OR5, -SO2R5, -SO2NHR5, -NHCOR5, halogen or COOR5 radical, wherein R5 represents alkyl, cycloalkyl, aralkyl or aryl, and the use of coumarin derivatives as energy converters in light-collecting systems.
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