45497-73-2Relevant articles and documents
A fluorescence quenching sensor for Fe3+ detection using (C6H5NH3)2Pb3I8·2H2O hybrid perovskite
Zhu, Meng-Ya,Zhang, Le-Xi,Yin, Jing,Chen, Jing-Jing,Bie, Li-Jian
, (2019)
A new organic-inorganic hybrid perovskite (C6H5NH3)2Pb3I8·2H2O single crystal has been synthesized through a facile solution method. In this perovskite, there exists a 1D infinite lead iodide chains constituted by Pb3I8 groups, which is surrounded by anilines. As an active fluorescence quenching sensor material, this perovskite shows excellent performance for Fe3+ detection in N, N-dimethylformamide (DMF) solution with a detection limit of 1.0 × 10?7 mol/L, including short response time, high sensitivity and high selectivity. The sensitivity and selectivity towards Fe3+ is much higher than that towards other metal cations, which provides a facile way for detecting Fe3+ cations in solution. Electron paramagnetic resonance (EPR) confirms that the mechanism of fluorescence quenching can be attributed to Fe3+ inhibition to the radiative electron-hole recombination via capturing electrons.
Convenient synthesis of cyclic carbonates from CO2 and epoxides by simple secondary and primary ammonium iodides as metal-free catalysts under mild conditions and its application to synthesis of polymer bearing cyclic carbonate moiety
Aoyagi, Naoto,Furusho, Yoshio,Endo, Takeshi
, p. 1230 - 1242 (2013/03/29)
Hydroiodides of secondary and primary amines effectively catalyzed the reaction of carbon dioxide and epoxides under mild conditions such as ordinary pressure and ambient temperature, to obtain the corresponding five-membered cyclic carbonates in moderate to high yields. Detailed investigation showed that the catalytic activity was highly affected by the counter anions of the ammonium salts; the iodides catalyzed efficiently the carbonate-forming reactions, whereas the bromide and chloride counterparts exhibited almost no catalysis. We also revealed that two important factors on the amine moieties that affected the catalytic reactions. First, the catalytic activity increased with increasing bulkiness of the substituents on the ammonium nitrogen atoms. Second, the catalysis became more efficient as the parent amines become more basic. Dicyclohexylammonium iodide was the best catalyst among the ammonium salts investigated in this study. As an application of this reaction system, we synthesized homo- and copolymers bearing epoxide pendant groups as substrates, which were converted with high efficiency into the corresponding homo- and copolymers bearing cyclic carbonate pendant groups under 1 atm at 45 °C. All polymers were easily purified simply by precipitation in water, and were isolated in high yields (>95%). 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2013. Copyright
EFFECT OF THE NATURE OF THE LEAVING GROUP IN REACTIONS OF 2-X-N-ETHYLPYRIDINIUM SALTS WITH AMINES IN ACETONITRILE
Titskii, G. D.,Mitchenko, E. S.
, p. 1949 - 1954 (2007/10/02)
The rate-determining stage in the nucleophilic substitution reactions of 2-X-N-ethylpyridinium salts with piperidine in acetonitrile changes, depending on the nature of the leaving group X.In the case where X = Hlg the controlling stage is the formation of the C-N bond.When X = 4-NO2C6H4O3, 3,4-(NO2)2C6H3O, and 2,6-(NO2)2C6H3O, nucleophilic substitution at the carbon atom is controlled by cleavage of the C-X bond.Nucleophilic substitution at a carbon atom of the benzene ring predominates in the reaction of 2-(2,4-dinitrophenoxy)-N-ethylpyridinium salt with piperidine.
NICKEL-CATALYZED AMIDATION OF BROMO- AND IODOBENZENE
Giannoccaro, Potenzo,Pannacciulli, Emiliano
, p. 119 - 128 (2007/10/02)
The carbonylation of aryl halides in the presence of p-RC6H4NH2 (R = H, CH3, Cl) or C6H5NHR (R = CH3, C2H5) and a catalytic amount of a nickel(II) or nickel(0) tertiary phosphine complex at 150 degC or above under carbon monoxide pressures is reported.Amides were obtained in high yields in reactions with p-RC6H4NH2, but with C6H5NHR compounds the expected N-alkyl benzanilides were not formed, benzanilide in low yield being formed instead.A possible catalytic cycle based on an active Ni(0)-carbonyl complex is suggested, and the observed deactivation of the catalytic system when the carbon monoxide pressure falls to 6 atm or below, is accounted for in terms of a side reaction which produces an inactive Ni(II) compound.
