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• W2134604568 abstract "Abstract Various indolenine squarylium dyes with additional electron‐donating amine redox centres have been synthesised and their redox chemistry has been studied. A combination of cyclic voltammetry, spectro‐electrochemistry and DFT calculations has been used to characterise the electronic structure of the mono‐, di‐ and, in one case, trications. All monocations still retain the cyanine‐like, delocalised character due to the relatively low redox potential of the squaraine bridge and are therefore compounds of Robin–Day class III. Thus we extended previous studies on organic mixed‐valence systems by using the indolenine squaraine moiety as very electron‐rich bridge between two electron‐donating amine redox centres to provoke a strong coupling between the additional redox centres. We synthesised TA3 , which has an N–N distance of 26 bonds between the triarylamine redox centres and is to our knowledge the longest bis(triarylamine) radical cation that is completely delocalised. We furthermore show that altering the symmetry of a squaraine dye by substitution of a squaric ring oxygen atom by a dicyanomethylene group has a direct impact on the optical properties of the monocations. In case of the dications, it turned out that the energetically most stable state of dianisylamine‐substituted squaraines is an anti‐ferromagnetically coupled open‐shell singlet state." @default.
• W2134604568 created "2016-06-24" @default.
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• W2134604568 creator A5089111876 @default.
• W2134604568 date "2011-11-14" @default.
• W2134604568 modified "2023-10-18" @default.
• W2134604568 title "Squaraine Dyes as Efficient Coupling Bridges between Triarylamine Redox Centres" @default.
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• W2134604568 doi "https://doi.org/10.1002/chem.201102227" @default.
• W2134604568 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22083939" @default.
• W2134604568 hasPublicationYear "2011" @default.
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