640737-72-0Relevant articles and documents
Phenothiazine Based Donor–Acceptor Compounds with Solid-State Emission in the Yellow to NIR Region and Their Highly Selective and Sensitive Detection of Cyanide Ion in ppb Level
Ramachandran, Elumalai,Vandarkuzhali, Somasundaram A. A.,Sivaraman, Gandhi,Dhamodharan, Raghavachari
, p. 11042 - 11050 (2018)
Four new novel donor–acceptor (A-π-D-A, A-D-π-D-A) compounds (1 a, 1 b, 2 a and 2 b) based on ethylenedioxythiophene (EDOT) and phenothiazine (PTz) have been rationally designed and synthesized towards solid state emission ranging from yellow to near infrared (NIR). The compounds 1 b and 2 b, in thin film form, showed an emission maximum at 713 nm and 696 nm, respectively, with the corresponding absolute solid-state quantum yield of 3.3 % and 9.0 %. The fluorophores showed high emission in the doped state as well when dispersed in polystyrene (PS) matrix with emission maximum ranging from 536 nm to 648 nm with quantum yield in the range 12.4 %–64.4 %. The presence of dicyanovinyl (DCV) group in both the fluorophores was exploited towards cyanide sensing in DMSO leading to turn-on fluorescence emission with high selectivity and sensitivity for cyanide ion with a detection limit of as low as 0.32 μm (8 ppb) for 1 b and 0.57 μm (14 ppb) for 2 b. DFT and TTDFT calculations suggested that the addition of cyanide ion prevented the intramolecular charge transfer (ICT) from the donor (PTz or EDOT) to acceptor (DCV), thereby turning the fluorescence “On”. Using fluorescent spectral and color switching, we have explored logic gates with single and two input signal amplification by applying chemical and light inputs in the form of CN? ion and UV.
Highly soluble electroactive ethylenedioxythiopene (EDOT)-based copolymer obtained via ‘click’ copolymerization
Kim, Hern,More, Pawan P.,Puguan, John Marc C.,Rathod, Pramod V.
, (2021/05/17)
Poly (3,4-ethylenedioxythiophene) (PEDOT), in spite of its remarkable attributes, remains insoluble in many common solvents. By adopting the copolymerization approach, a new electroactive polythiopene derivative is synthesized with enhanced solubility by polymerizing an alkyne-functionalized (3-4-ethylenedioxythiophene) (EDOT) and an azide-functionalized tetraethylene glycol via copper catalyzed alkyne-azide cycloaddition (CuAAC). The copolymer, EDOT-co-1,2,3-triazolium, exhibits an interesting chemical structure that makes it an ideal electroactive material. With its polar nature, it readily dissolves in solvents such as DMSO, DMF and PC. Furthermore, the introduction of the oxyethylene monomer as well as the formation of the 1,2,3-triazole during the polymerization step lowers its glass transition temperature inducing a faster switching between its reduced and oxidized state compared to pristine PEDOT.
Clean and Efficient Iodination of Thiophene Derivatives
Grolleau, Jérémie,Frère, Pierre,Gohier, Frédéric
, p. 3901 - 3906 (2015/12/18)
Iodination of thiophene derivatives is realized using a simple, fast, and efficient methodology. Iodination of thiophene and 2- or 3-substituted or 3,4-disubstituted thiophenes with N-iodosuccinimide (NIS) activated with 4-toluenesulfonic acid in ethanol gives pure iodinated products that require no further purification.
