Recently I am researching about AGGREGATION-INDUCED EMISSION; MECHANOCHROMIC LUMINESCENCE; FLUORESCENCE; INTERCALATION; ADSORPTION; COMPLEXES; TETRAMETHYLAMMONIUM; DESIGN; MICA; DYE, Saw an article supported by the JSPS KAKENHIMinistry of Education, Culture, Sports, Science and Technology, Japan (MEXT)Japan Society for the Promotion of ScienceGrants-in-Aid for Scientific Research (KAKENHI) [26810121, 20K05661, 26410009, JP15H01081, JP17H05253, JP19H02686]; Mukai Science and Technology FoundationMukai Science and Technology Foundation. Published in SPRINGERNATURE in LONDON ,Authors: Okada, T; Miyamoto, Y; Kurihara, H; Mochiduki, Y; Katsumi, S; Ito, F. The CAS is 614-18-6. Through research, I have a further understanding and discovery of Ethyl nicotinate. Formula: C8H9NO2
Electrostatic interactions between a quaternary pyridyl-beta-diketonate and anionic charged nanosheets were observed to produce a highly emissive dispersion in a rich water solution. A greater fluorescence quantum yield of approximately 50% was obtained when a luminogenic beta-diketonate, 1-(4-methoxyphenyl)-3-(3-hydroxyethyl-pyridinium bromide)-1,3-propandione (prepared by the Claisen condensation reaction and subsequent quaternization), was molecularly dispersed and enclosed by a couple of atomically flat ultrathin (approximately 1.0 nm) silicate sheets of anionic layered clay. By accommodating beta-diketonate into a narrow interlamellar space (approximately 0.4 nm distance), the molecular motion was suppressed, as confirmed by a smaller non-radiative relaxation rate constant, which was obtained by time-resolved luminescence and quantum yield measurements. Because the dense packing of beta-diketonate quenched the excited state, the isolation of luminogens by the co-adsorption of photochemical inert cations (tetramethylammonium and benzylammonium) was prevented by concentration quenching. A lower quantum yield was obtained by expanding the interlayer distance above 1.0 nm by co-adsorbing a photo-inactive water-soluble polymer, poly(vinylpyrrolidone). Therefore, the fixation and spatial separation of beta-diketonate in the narrow interlayer space was determined to be essential for obtaining strong emission.
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Reference:
Pyridine – Wikipedia,
,Pyridine | C5H5N – PubChem