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Phenothiazine derivatives based on the 10‐phenyl‐10H‐phenothiazine (NAS) chromophore, namely 7‐phenyl‐7H‐benzo[c]phenothiazine (NAS‐1) and 12‐phenyl‐12H‐benzo[a]phenothiazine (NAS‐2), were designed and synthesized. NAS‐1 and NAS‐2 are constitutional isomers with different steric strains imposed on the phenothiazine core moiety. In solution, the more‐strained NAS‐2 possesses a bent structure and undergoes...
The D‐π‐A type phosphonium salts in which electron acceptor (A=‐+PR3) and donor (D=‐NPh2) groups are linked by polarizable π‐conjugated spacers show intense fluorescence that is classically ascribed to excited‐state intramolecular charge transfer (ICT). Unexpectedly, salts with π=‐(C6H4)n‐ and ‐(C10H6C6H4)‐ exhibit an unusual dual emission (F1 and F2 bands) in weakly polar or nonpolar solvents. Time‐resolved...
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