82855-20-7Relevant academic research and scientific papers
Picosecond Switchable Azo Dyes
Garcia-Amorós, Jaume,Maerz, Benjamin,Reig, Marta,Cuadrado, Alba,Blancafort, Lluís,Samoylova, Elena,Velasco, Dolores
supporting information, p. 7726 - 7732 (2019/05/21)
Azo dyes that combine electron-withdrawing thiazole/benzothiazole heterocycles and electron-donating amino groups within the very same covalent skeleton exhibit relaxation times for their thermal isomerization kinetics within milli- and microsecond timescales at room temperature. Notably, the thermal back reaction of the corresponding benzothiazolium and thiazolium salts occurred much faster, within the picosecond temporal domain. In fact, these new light-sensitive platforms are the first molecular azo derivatives capable of reversible switching between their trans and cis isomers in a subnanosecond timescale under ambient conditions. In addition, theoretical calculations revealed very low activation energies for the isomerization process, in accordance with the fast subnanosecond kinetics that were observed experimentally.
CATIONIC DYES
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Page/Page column 25, (2008/12/07)
Disclosed are dyes of Formula (I) wherein D is the radical of anthraquinone, acridine, azo, azomethine, hydrazomethine, benzodifuranone, coumarine, diketopyrrolopyrrol, dioxaxine, diphenylmethane, formazane, indigoid, indophenol, naphtalimide, naphthaquinone, nitroaryl, merocyanine, methine, oxazine,perinone, perylene, pyrenequinone, phtalocyanine, phenazine, quinoneimine, quinacridone, quinophtalone, stilbene, styryl, triphenylmethane, xanthene, thiazine dye and thioxanthene dye; Q is C 1-C 30alkylene, -C 2-C 12alkenylene, C 5-C10arylene-, C 5-C 10cycloalkylene-or -C 1- C 10alkylene(C5-C10arylene)-which may be interrupted and/or terminated at one or both ends by one or more than one -O-, -S-, -N=, -N(R 1)-, SO2, -(CH 2CH 2-O) 1-5-, -(CH 2CH 2CH 2-O) 1-5-, -C(O)-, -C(O)-C1-C12alkenylene, -C(O)O-, -OCO-, AN+ R 1 R 2, -CON(R 1)-, -C(NR1R2) 2-, -(R1)NC(O)-, -CSR1-or an optionally substituted, saturated or unsaturated, fused or non-fused aromatic or nonaromatic (hetero)cyclic) bivalent radical optionally comprising at least one heteroatom; -O-; -S-; -N(R1)-; SO2; -(CH2CH2-O) 1-5-; -C(O)-; -C(O)-C1-C12alkenylene; -C(O)O-, -OCO-;B N+ R 1 R 2; -CON(R1)-; -C(NR1R 2) 2-; -(R1)NC(O)-; CSR1; saturated or unsaturated, fused or non-fused aromatic or nonaro- matic bivalent radical optionally comprising at least one heteroatom; which is optionally substituted by C1-C30alkyl, C1-C30alkoxy, -C2-C12alkenyl, C5-C10aryl, C5-C10cycloalkyl, C1- C10alkyl(C5-C10arylene), hydroxy or D+; R1and R2 independently from each other are hydrogen; or unsubstituted or substituted, straight-chain or branched, monocyclic or polycyclic, interrupted or uninterrupted C1- C14alkyl; C1-C14hydroxyalkyl; C1-C14 aminoalkyl; C2-C14alkenyl; C6-C10aryl; C6-C10aryl-C1- C10alkyl; or C 5-C 10alkyl(C5-C10aryl).
