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824-78-2Relevant articles and documents
Two picolinamide-based Zn(II) coordination polymers: Syntheses, structures, and catalytic activities
Li, Linke,Yao, Hongchang,Zhao, Jingjing,Yang, Zhihui,Hou, Hongwei
, p. 46 - 52 (2012)
Two picolinamide-based zinc(II) coordination polymers {[Zn(SO 4)(3-bpit) (CH3OH)2]·2CH 3OH}n (1)(3-bpit = N,N'-bis(3-pyridylformyl)imidazolidine- 2-thione) and [Zn(SCN)2(4-bpit)]n(2) (4-bpit = N,N'-bis(4-pyridylformyl)imidazolidine -2-thione) have been synthesized and structurally characterized. In complexes 1 and 2, the picolinamide-based ligands, 3-bpit and 4-bpit, function as bridging bidentate mode, leading to polymeric structures. Complex 1 is a two-dimensional coordination polymer while 2 exhibits a one-dimensional chain structure. The hydrolysis of 4-nitrophenyl acetate catalyzed by complexes 1 and 2 under mild conditions was also investigated.
In situ generation of a high-performance Pd-polypyrrole composite with multi-functional catalytic properties
Choudhary, Meenakshi,Islam, Rafique Ul,Witcomb, Michael J.,Mallick, Kaushik
, p. 6396 - 6405 (2014)
We report on a bottom up approach for the synthesis of a Pd-polypyrrole nanocomposite material. The composite material was characterized by means of different techniques, such as UV-vis, IR, and Raman spectroscopy, which offered information about the chemical structure of the polymer, whereas electron microscopy images provided information regarding the morphology of the composite material and the distribution of the metal particles in the polymer matrix. During the synthesis of the nanocomposite, the Pd nanoparticles act as a catalyst for a model proton-coupled electron transfer reaction. The Pd-polypyrrole nanocomposite material was also used as a catalyst for the electro-catalytic detection of tryptophan, a precursor for some neurotransmitters. This journal is the Partner Organisations 2014.
The α-Deuterium Secondary Kinetic Isotope Effect upon the Hydrolysis of 2-(p-Nitrophenoxy)tetrahydropyran and its Relationship to Values for the Solvolysis of Secondary Alkyl Arenesulfonates and the Enzyme-catalysed Hydrolysis of Acetals
Lee, Won Heui,Maskill, H.,Manneer, Iain D.
, p. 503 - 504 (1993)
The α-deuterium secondary kinetic isotope effect for the uncatalysed hydrolysis of 2-(p-nitrophenoxy)tetrahydropyran is 1.17 in water (46 deg C), a result which is very similar to values for the solvolysi of simple secondary alkyl arenesulfonates which proceed with rate-limiting ionization and appreciably higher than results for enzyme-catalysed hydrolysis of other acetals.
Reactivity differences of O-aryl O-(4-nitrophenyl) thionocarbonates versus their homolog carbonates: Micellar catalysis in hydrolysis reactions
Santos, José G.,Aliaga, Margarita E.,Márquez, Mariana F.,Oyarzún, Mauricio
, (2018)
The alkaline hydrolysis reaction of O-(4-cyanophenyl), O-(4-methylphenyl), and phenyl O-(4-nitrophenyl) thionocarbonates (1, 2, and 3, respectively) and O-(4-cyanophenyl) and phenyl O-(4-nitrophenyl) carbonates (4 and 5, respectively) has been spectrophotometrically studied in aqueous borate buffer media, in the presence of the cationic surfactant CTAB. The pseudophase model successfully explained the results obtained, in the presence of this cationic micelle, and various kinetic parameters were determined. Results show that the catalytic efficiency increases in carbonates and thionocarbonates. In fact, a catalytic efficiency ( kobsmax/k'w) of 485-fold was found in the hydrolysis reaction of thionocarbonate 1, while in the carbonate homolog 4, the effect was of 146-fold. In addition, we found that at the same experimental conditions (Borate buffer pH = 9.0 and 25°C), an increase in the concentration of the buffer led to a decrease of the hydrolysis rate.
Polyphenol-grafted collagen fiber as reductant and stabilizer for one-step synthesis of size-controlled gold nanoparticles and their catalytic application to 4-nitrophenol reduction
Wu, Hao,Huang, Xin,Gao, Mingming,Liao, Xuepin,Shi, Bi
, p. 651 - 658 (2011)
A facile method for one-step synthesis of size-controlled gold nanoparticles (AuNPs) supported on collagen fiber (CF) at room temperature was proposed. Epigallocatechin-3-gallate (EGCG), a typical plant polyphenol, was grafted onto CF surface to serve as reducing/stabilizing agent, so that the AuNPs were generated on CF surface without introduction of extra chemical reagents or physical treatments. The prepared AuNPs were fully characterized, and the results showed that the dispersed AuNPs were successfully produced and the mean particle size of AuNPs could be effectively controlled in range of 18 to 5 nm simply by varying the grafting degree of EGCG on CF surface. These stabilized AuNPs were found to be active heterogeneous catalysts for the reduction of 4-nitrophenol to 4-aminophenol in aqueous phase. The catalytic behaviors of AuNPs depended on the particle size and the grafting degree of EGCG. A distinct advantage of these catalysts is that they can be easily recovered and reused at least twenty times, because of the high stability of the AuNPs supported by EGCG-grafted CF. The Royal Society of Chemistry.
Temperature-Dependent Reactivity of a Non-heme FeIII(OH)(SR) Complex: Relevance to Isopenicillin N Synthase
Yadav, Vishal,Siegler, Maxime A.,Goldberg, David P.
supporting information, p. 46 - 52 (2021/01/13)
Non-heme iron complexes with cis-FeIII(OH)(SAr/OAr) coordination were isolated and examined for their reactivity with a tertiary carbon radical. The sulfur-ligated complex shows a temperature dependence on ?OH versus ArS? transfer, whereas the oxygen-ligated complex does not. These results provide the first working model for C-S bond formation in isopenicillin N synthase and indicate that kinetic control may be a key factor in the selectivity of non-heme iron "rebound"processes.
Thiosemicarbazone(s)-anchored water soluble mono- A nd bimetallic Cu(ii) complexes: Enzyme-like activities, biomolecular interactions, anticancer property and real-time live cytotoxicity
Awale, Suresh,Balakrishnan, Nithya,Bhuvanesh, Nattamai,Dhanabalan, Ananda Krishnan,Dibwe, Dya Fita,Haribabu, Jebiti,Karvembu, Ramasamy,Sun, Sijia,Swaminathan, Srividya
supporting information, p. 9411 - 9424 (2020/09/09)
The reactions of CuCl2·2H2O with chromone thiosemicarbazone ligands containing a-H or-CH3 substituent on terminal N yielded monometallic Cu(ii) complexes [Cu(HL1)Cl2] (1) and [Cu(HL2)Cl2] (2), whereas bimetallic Cu(ii) complexes [Cu(μ-Cl)(HL3)]2Cl2 (3), [Cu(μ-Cl)(HL4)]2Cl2 (4) and [Cu(μ-Cl)(L5)]2 (5) were obtained when a-C2H5,-C6H11 or-C6H5 substituent was present, respectively, in the ligands. The complexes were characterized using elemental analyses, UV-Vis, FT-IR, EPR, mass and TGA studies. The structures of neutral monometallic and dicationic bimetallic complexes were confirmed by single crystal X-ray diffraction, and they exhibited a distorted square pyramidal geometry around Cu(ii) ions. The catecholase-mimicking activity of complexes 1-5 was examined spectrophotometrically, and the results revealed that all the complexes except 5 had the ability to oxidize 3,5-di-tert-butylcatechol (3,5-DTBC) to 3,5-di-tert-butylquinone (3,5-DTBQ) under aerobic conditions with moderate turnover numbers. In order to find the possible complex-substrate intermediates, a mass spectrometry study was carried out for complexes 1-4 in the presence of 3,5-DTBC. The phosphatase-like activity of 1-5 was also investigated using 4-nitrophenylphosphate (4-NPP) as a model substrate. All the complexes exhibited excellent phosphatase activity in DMF-H2O medium. The complexes displayed significant biomolecular interactions and antioxidant potential. Complex 3 showed good interaction with apoptotic CASP3 protein, VEGFR2 and PIM-1 kinase receptors as revealed by a molecular docking study. Complexes (3-5) exhibited promising cytotoxicity against HeLa-cervical cancer cells with IC50 values of 2.24 (3), 2.25 (4) and 3.77 (5) μM, respectively, and showed a two-fold higher activity than cisplatin. The active complex 3 showed complete inhibition of colony formation at 10 μM concentration. In addition, the acridine orange (AO)/ethidium bromide (EB) staining and real-time live cell imaging results confirmed that complex 3 induced cell death in HeLa cells.
Modulating charge carrier density and mobility in doped graphene by covalent functionalization
Arellano, Luis M.,Yue, Sun,Atienzar, Pedro,Gómez-Escalonilla, María J.,Ortega-Higueruelo, Francisco J.,Fierro, José Luis G.,García, Hermenegildo,Langa, Fernando
supporting information, p. 9999 - 10002 (2019/08/22)
Covalent B-functionalization of B-doped graphene has been performed for the first time. The electronic properties and Hall effect of functionalized N- and B-doped graphene can be tuned by tailoring the electron-donating/-withdrawing properties of the organic addend.