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          Institute: MPI für medizinische Forschung     Collection: Arbeitsgruppe Zimmermann     Display Documents

ID: 569035.0, MPI für medizinische Forschung / Arbeitsgruppe Zimmermann
Radical pair formation from excited states in doped aromatic crystals. I. Epr studies of the guest−host system acridine−fluorene
Translation of Title:Radical pair formation from excited states in doped aromatic crystals. I. Epr studies of the guest−host system acridine−fluorene
Authors:Furrer, R.; Heinrich, M.; Stehlik, Dietmar; Zimmermann, Herbert
Date of Publication (YYYY-MM-DD):1979-01-01
Title of Journal:Chemical Physics
Journal Abbrev.:Chemical Physics
Issue / Number:1
Start Page:27
End Page:40
Review Status:Peer-review
Audience:Experts Only
Intended Educational Use:No
Abstract / Description:Following light absorption in acridine doped fluorene single crystals formation of a triplet state complex (heteroexcimer) has been established earlier. More detailed EPR investigations presented here permit the clarification of the nature of this complex. Hyperfine structure has been resolved for three nuclear spins which could be assigned by selective deuteration experiments: the nitrogen and meso−proton spin located in the guest−constituent of the complex and one proton spin originating from the CH2−group of a fluorene host molecule. The complete hyperfine tensors could be evaluated. The anisotropy is found to be that of a planar aromatic CH−fragment for both observed proton spins. As a consequence of the CH−fragment assignment the central CH2−group of the fluorene constituent of the complex has to change from a sp3 to a planar sp2 configuration indicating a photoinduced radical pair formation involving hydrogen abstraction from a fluorene and hydrogen addition to an acridine molecule. The model is able to explain: (a) the high spin density located at the observed CH−fragments; (b) the geometry of the molecular partners involved in the complex, and (c) the fine structure tensor on the basis of a simple point charge dipole−dipole coupling of the two unpaired electron spins
Last Change of the Resource (YYYY-MM-DD):--
External Publication Status:published
Document Type:Article
Communicated by:Wulf Kaiser
Affiliations:MPI für medizinische Forschung/Abteilung Biophysik
MPI für medizinische Forschung/Arbeitsgruppe Zimmermann
MPI für medizinische Forschung/Abteilung Molekulare Physik
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