153-78-6Relevant articles and documents
A new and efficient pyridine-2,6-dicarboxamide-based fluorescent and colorimetric chemosensor for sensitive and selective recognition of Pb2+ and Cu2+
Hosseinzadeh, Rahman,Rahimi, Hannaneh,Tajbakhsh, Mahmood
, (2021)
A new fluorene-bearing pyridine-2,6-dicarboxamide (3) as an effectint fluorescent and colorimetric cation sensor was successfully synthesized and well-characterized using FT-IR, NMR, ESI+-MS and elemental analysis. The metal ion binding ability of the chemosensor 3 in the presence of different metal ions was investigated using UV–vis, fluorescence experiments and results exhibited a desirable selectivity and significant sensitivity of the chemosensor 3 for the detection of Cu2+ and Pb2+ ions. The association constant (Ka) of 3-Cu2+ and 3-Pb2+ complexes were determined to be 8.89 × 103 M?1 and 5.65 × 108 M-2, respectively. The obtained limit of detection (LOD) values (1.49 × 10?6 M for Cu2+ and 2.31 × 10?6 M for Pb2+) clearly revealed the considerable sensitivity of the chemosensor 3.
Ultrasound-promoted highly efficient reduction of aromatic nitro compounds to the aromatic amines by samarium/ammonium chloride
Basu, Manas K.,Becker, Frederick F.,Banik, Bimal K.
, p. 5603 - 5606 (2000)
Ultrasound-promoted, highly efficient reduction of several aromatic nitro compounds to the aromatic amines was achieved by samarium/ammonium chloride mediated reaction. (C) 2000 Elsevier Science Ltd.
Route to the tritiation of carbon atom 9 of carcinogenic fluorenylhydroxamic acids
Gutmann,Bell
, p. 255 - 270 (1974)
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Non-specific tritiation of some carcinogenic aromatic amines
Breeman,Kaspersen,Westra
, p. 741 - 750,748,749 (1978)
2-Aminofluorene, 4-amino-3-methylbiphenyl, 4-amino-biphenyl and 4-amino-4'-fluorobiphenyl were tritiated by acid catalyzed exchange of the corresponding nitro compounds followed by catalytic reduction. The exchange reactions were carried out by heating the nitro compounds in [3H]-trifluoroacetic acid with a catalytic amount of trifluoromethanesulphonic acid (TFMS). No loss of tritium could be detected during the conversion of the tritiated nitro compounds into the corresponding amines by catalytic hydrogenation. Incorporation into the ortho position is very low (4%). During the metabolic activation and binding of the tritiated N-acetyl-2-aminofluorene to rat liver DNA in vivo, no tritium exchange occurred.
Amidofluorene-appended lower rim 1,3-diconjugate of calix[4]arene: Synthesis, characterization and highly selective sensor for Cu2+
Hosseinzadeh, Rahman,Nemati, Mohammad,Zadmard, Reza,Mohadjerani, Maryam
, p. 1749 - 1757 (2016)
Functionalization of calix[4]arene with amidofluorene moieties at the lower rim led to formation of the 1,3-diconjugate of calix[4]arene L as a novel fluorescent chemosensor for Cu2+. The receptor molecule L exhibited a pronounced selectivity towards Cu2+ over other mono and divalent ions. The formation of the complex between L and Cu2+ was evaluated by absorption, fluorescence and 1H NMR spectroscopy. The sensor L showed a remarkable color change from colorless to purple and a fluorescence quenching only upon interaction with Cu2+. The 1:1 stoichiometry of the obtained complex has been determined by Job's plot. The association constant determined by fluorescence titration was found to be 1.8 × 106 M-1. The sensor showed a linear response toward Cu2+ in the concentration range from 1 to 10 μM with a detection limit of 9.6 × 10-8 M.
Half-Sandwich Ruthenium Complexes of Amide-Phosphine Based Ligands: H-Bonding Cavity Assisted Binding and Reduction of Nitro-substrates
Pachisia, Sanya,Kishan, Ram,Yadav, Samanta,Gupta, Rajeev
, p. 2009 - 2022 (2021/02/06)
We present synthesis and characterization of two half-sandwich Ru(II) complexes supported with amide-phosphine based ligands. These complexes presented a pyridine-2,6-dicarboxamide based pincer cavity, decorated with hydrogen bonds, that participated in the binding of nitro-substrates closer to the Ru(II) centers, which is further supported with binding and docking studies. These ruthenium complexes functioned as the noteworthy catalysts for the borohydride mediated reduction of assorted nitro-substrates. Mechanistic studies not only confirmed the intermediacy of [Ru-H] in the reduction but also asserted the involvement of several organic intermediates during the course of the catalysis. A similar Ru(II) complex that lacked pyridine-2,6-dicarboxamide based pincer cavity substantiated its unique role both in the substrate binding and the subsequent catalysis.
Hydrogenation of nitroarenes catalyzed by a dipalladium complex
Hung, Ming-Uei,Yang, Shu-Ting,Ramanathan, Mani,Liu, Shiuh-Tzung
, (2017/09/06)
A dipalladium complex [Pd2(L)Cl2](PF6)2 (2), via the substitution of (PhCN)2PdCl2 with 5-phenyl-2,8-bis(6′-bipyridinyl)-1,9,10-anthyridine (L) followed by the anion exchange, was found to be a good pre-catalyst for the reduction of nitroarenes to yield the corresponding anilines under atmospheric pressure of hydrogen in methanol. This method provides a straightforward access to a diverse array of functionalized anilines, exhibiting a possible application in synthetic chemistry. The catalytic activity of this complex is enhanced by the di-metallic system via the synergistic effect.
