《Synthesis and photophysical studies of an indigo derivative: N-octyl-7,7′-diazaindigo》 was written by de Miguel, Gustavo; Garzon-Ruiz, Andres; Navarro, Amparo; Garcia-Frutos, Eva M.. Recommanded Product: Oxetan-3-ol And the article was included in RSC Advances in 2020. The article conveys some information:
In this paper, we explore the synthesis, characterization, and photophys. properties of a novel indigo derivative, N-octyl-7,7′-diazaindigo, being the first time that diazaindigos have been studied as photophys.-active chem. entities. Reduction of the neutral “”keto-form”” to the so-called “”leuco-form”” changes the global spectroscopic and photophys. behaviors. Both species have been investigated by different photophys. studies, such as anal. of absorption and emission spectra, fluorescence quantum yields (ϕF) and lifetimes. Finally, to appraise in depth the deactivation of the excited state of the keto form, femtosecond transient absorption (TA) experiments and D. Functional Theory (DFT) and Time Dependent (TD)-DFT calculations were performed. In an organic aprotic solvent (N,N-dimethylformamide), TA experiments showed a fast deactivation channel (τ1 = 2.9 ps), which was ascribed to solvent reorganization, and a longer decay component (τ2 = 86 ps) associated with an internal conversion (IC) process to the ground-state, in opposition to the excited state proton transfer (ESPT) mechanism that takes place in the indigo mols. but in protic solvents. A comparative study was also carried out on the parent mol., 7,7′-diazaindigo, corroborating the previous conclusions obtained for the alkyl derivative In agreement with exptl. observations, DFT and TD-DFT calculations revealed that the deactivation of the S1 state of the keto form takes place through an internal conversion process. The experimental process involved the reaction of Oxetan-3-ol(cas: 7748-36-9Recommanded Product: Oxetan-3-ol)
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