153-78-6Relevant academic research and scientific papers
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.
A new fluorene-based Schiff-base as fluorescent chemosensor for selective detection of Cr3?+ and Al3?+
Tajbakhsh, Mahmood,Chalmardi, Gholam Babaei,Bekhradnia, Ahmadreza,Hosseinzadeh, Rahman,Hasani, Nahid,Amiri, Mohammadreza Azizi
, p. 22 - 31 (2018)
2-((9H-fluoren-2-ylimino) methyl)phenol (F3) was synthesized by condensation reaction of 9H-fluoren-2-amine and 2-hydroxybenzaldehyde in EtOH and characterized by its melting point, 1H-,13C NMR and molecular mass. F3 exhibits a high selectivity for detection of Cr3?+ and Al3?+ ions as a fluorescent chemosensor and showed a single emission band at 536?nm upon excitation at 333?nm according to fluorescence emission studies. The addition of Cr3?+ and Al3?+ make a significant increase in fluorescent intensity at 536?nm in CH3CN, while other metal ions have almost no influence on the fluorescence. The fluorescence enhancement was attributed to the inhibited C[dbnd]N isomerization and the obstructed excited state intra-molecular proton transfer (ESIPT) of compound F3. Job's plot and DFT calculations data showed that the binding stoichiometries of F3 with Cr3?+ and Al3?+ are 2:1. The association constants (Ka) for Cr3?+ and Al3?+ were calculated and found to be 8.33?×?104?M??1 and 5.44?×?104?M??1, respectively. The detection limits were also calculated for Cr3?+ and Al3?+ and found to be 2.5?×?10??7?mol/L and 3.1?×?10??7?mol/L, respectively.
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.
Transfer hydrogenation of nitroarenes into anilines by palladium nanoparticles via dehydrogenation of dimethylamine borane complex
Patil, Nilesh M.,Bhosale, Manohar A.,Bhanage, Bhalchandra M.
, p. 86529 - 86535 (2015)
This work reports a simple and highly efficient protocol for reduction of nitroarenes to corresponding amines via dehydrogenation of dimethylamine borane using palladium nanoparticle (Pd NPs) as a versatile heterogeneous catalyst. The facile approach for the synthesis of Pd NPs within 15 min in aqueous medium has been reported. The Pd NPs were well characterized using various analytical techniques such as XRD, FEG-SEM, TEM, EDAX and XPS. The developed catalytic system uses environmentally benign dimethylamine borane as a reducing agent which is highly stable, water soluble and nontoxic. The various amines were synthesized from nitroarenes in excellent yields within 10-60 min at room temperature. The catalyst was reused up to four successive cycles without significant loss in its catalytic activity.
Comparative analysis to explore the suitability of a short chain dyad in its pristine and nanocomposite forms for designing artificial light energy conversion device
Paul, Somnath,Mitra, Ishani,Dutta, Rituparna,Bardhan, Munmun,Bose, Mridul,Das, Subrata,Saha, Mithu,Ganguly, Tapan
, p. 7873 - 7881 (2018)
From the UV-vis, steady state and time resolved spectroscopic investigations on the pristine dyad, dyad-spherical gold nanoparticles (GNP) and dyad-star shaped gold nanoparticles (GNS), it was observed that though in the ground state the dyad in its pristine form possesses trans-type (elongated and planar) isomer but on photoexcitation trans-form converts into cis-structure (folded). Interestingly, the dyad exhibits different behavior when it combines with GNP or GNS. In nanocomposite form, even on photoexcitation some ground state trans-structure still retains its identity in the excited state. The 60% of the trans-species remains unchanged in the excited state due to excitation of dyad-GNS system and possibly this configuration facilitates the hindrance of energy destructive charge recombination processes as in this conformer the donor and acceptor moieties tend to move far away from each other causing lack of overlapping of charge clouds within the two redox components. The dyad-GNS nanocomposite appears to be the best possible light energy conversion or storage device within the three system studied in the present investigation. Investigations are underway to examine how the degree of surface coverage of the dyad on the surface of gold nanoparticles affect its geometry or conformational changes on photoexcitation.
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.
Rabbit liver enzymes responsible for reduction of nitropolycyclic aromatic hydrocarbons
Kitamura,Narai,Hayashi,Tatsumi
, p. 776 - 779 (1983)
The present paper is the first description of mammalian nitroreductases acting upon nitropolycyclic aromatic hydrocarbons. Rabbit liver microsomal and cytosolic fractions have ability to reduce 1-nitropyrene or 2-nitrofluorene to the corresponding amine under anaerobic conditions. The nitroreductase activity in the former fraction is mainly due to a cytochrome P-450 system and that in the latter fraction is due to aldehyde oxidase.
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.
Ionothermal Synthesis of an Antimonomolybdate Cluster, [Sb8MoVI13MoV5O66]5-, and Its Catalytic Behavior to the Reduction of Nitrobenzene
Shi, Shu-Kui,Li, Xin,Guo, Hui-Li,Fan, Yan-Hua,Li, Hai-Yan,Dang, Dong-Bin,Bai, Yan
, p. 11213 - 11217 (2020)
The largest antimonomolybdate monomer, [Sb8MoVI13MoV5O66]5- (1-Sb8Mo18), has been isolated and displays a new breakthrough of polyoxometalates (POMs) with an ionothermal synthesis strategy. 1-Sb8Mo18 features the first hexanuclear sandwich-Type polymolybdate (POMo) with an unexpected metal ring {Sb6O12} to make its debut in Sb clusters. Furthermore, 1-Sb8Mo18 exhibits a prominent catalytic activity for reducing nitrobenzene to aniline with excellent sustainability.
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.
