Debabrata Chatterjee  Namita Jaiswal  Jagadeesh C. Bose K  Ram Balak Mahato  Diptendu Bhattacharyya 《Journal of Coordination Chemistry》2015,68(17-18):3229-3235

Reaction of [Ru^III(EDTA)(CyS)]^2? (edta^4? = ethylenediaminetetraacetate; CySH = cysteine) with molecular oxygen (O₂) has been studied as a function of pH (4.0–8.0) and cysteine concentration (0.2–2.0 mM) at room temperature (25 °C). Biological activities of the [Ru(EDTA)]/CySH/O₂ system pertaining to cleavage of supercoiled plasmid DNA to its nicked open circular form has been explored in this work. Results are discussed in regard to the reaction of the ruthenium(III)-complex with molecular oxygen) and a working mechanism is proposed for the biological activities of the ruthenium(III)-complex in the presence of O₂.  相似文献   

    

Awantika Singh  Vikas Bajpai  Sunil Kumar  Kamal Ram Arya  Kulwant Rai Sharma  Brijesh Kumar 《Journal of separation science》2015,38(12):2007-2013

Berberis species are well known and used extensively as medicinal plants in traditional medicine. They have many medicinal values attributable to the presence of alkaloids having different pharmacological activities. In this study, a method was developed and validated as per international conference on harmonization guidelines using ultra high performance liquid chromatography with hybrid triple quadrupole‐linear ion trap mass spectrometry operated in the multiple reaction monitoring mode for nine bioactive compounds, including protoberberine alkaloids, aporphine alkaloids and chlorogenic acid. This method was applied in different plant parts of eight Berberis species to determine variations in content of nine bioactive compounds. The separation was achieved on an ACQUITY UPLC CSH? C₁₈ column using a gradient mobile phase at flow rate 0.3 mL/min. Calibration curves for all the nine analytes provided optimum linear detector response (with R² ≥0.9989) over the concentration range of 0.5–1000 ng/mL. The precision and accuracy were within RSDs ≤2.4 and ≤2.3%, respectively. The results indicated significant variation in the total contents of the nine compounds in Berberis species.  相似文献   

    

Gad Sabbatier  Aitor Larraaga  Andre‐Anne Guay‐Bgin  Jorge Fernandez  Florence Dival  Bernard Durand  Jose‐Ramon Sarasua  Gatan Laroche 《Macromolecular bioscience》2015,15(10):1392-1410

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Dong Won Kang  Kwang Soo Lim  Kyung Jin Lee  Jong Hyeon Lee  Dr. Woo Ram Lee  Jeong Hwa Song  Kyu Hyun Yeom  Dr. Jin Young Kim  Prof. Chang Seop Hong 《Angewandte Chemie (International ed. in English)》2016,55(52):16123-16126

We demonstrate the facile microwave‐assisted synthesis of a porous organic framework 1 and the sulfonated solid ( 1S ) through postsubstitution. Remarkably, the conductivity of 1S showed an approximately 300‐fold enhancement at 30 °C as compared to that of 1 , and reached 7.72×10^?2 S cm^?1 at 80 °C and 90 % relative humidity. The superprotonic conductivity exceeds that observed for any conductive porous organic polymer reported to date. This material, which is cost‐effective and scalable for mass production, also revealed long‐term performance over more than 3 months without conductivity decay.  相似文献   

    

Vladimir Paunović  Guido Zichittella  Dr. Réne Verel  Dr. Amol P. Amrute  Prof. Javier Pérez‐Ramírez 《Angewandte Chemie (International ed. in English)》2016,55(50):15681-15681

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Irene Sánchez-Molina;Andrea Moneo-Corcuera;David Nieto-Castro;Jordi Benet-Buchholz;José Ramón Galán-Mascarós; 《欧洲无机化学杂志》2021,2021(2):112-116

We report a triazole-based trinuclear iron(II) compound with bridging 4-(p-methylphenyl)-1,2,4-triazole ligands with solvatochromic spin crossover (SC) behavior. The magnetic properties of this trimer depend on crystallization solvent molecules. Pink crystals (color suggesting low spin state), showing a triclinic structure can be obtained by slow diffusion of diethyl ether in acetonitrile solution. As in other SC materials, immersion of these crystals in different solvents promote color change. In this case, we have been able to define the microscopic effect of the solvent substitution following the single crystal to single crystal transformation by UV/Vis absorption spectroscopy and X-ray diffraction. Furthermore, the solvent-induced switching can be explained by weak intermolecular interactions provoking a variation in the relative orientations of the two aromatic rings in the ligands, which, in turn, determines the ligand field on the central Fe(II), and its SCO behavior. This study brings important details to the origin of solvatochromism in SCO materials, offering alternatives for better control of this switching and, potentially, for their application as colorimetric sensors.  相似文献   

    

Pradip D. Nahide;Velayudham Ramadoss;Kevin A. Juárez-Ornelas;Yuvraj Satkar;Rafel Ortiz-Alvarado;Juan M. J. Cervera-Villanueva;Ángel J. Alonso-Castro;Juan R. Zapata-Morales;Marco A. Ramírez-Morales;Alan J. Ruiz-Padilla;Martha A. Deveze-Álvarez;César R. Solorio-Alvarado; 《European journal of organic chemistry》2018,2018(4):485-493

A new and in situ formed reagent generated by mixing PIFA {bis[(trifluoroacetoxy)iodobenzene]} and AlCl3 was introduced in the organic synthesis for the direct and highly regioselective ortho-chlorination of phenols and phenol ethers. An efficient electrophilic chlorination for these electron-rich arenes as well as the scope of the reaction are described herein. An easy, practical, and open-flask reaction allowed us to introduce a chlorine atom, which is a highly important functional group in organic synthesis. The reproducibility of our method has been demonstrated on gram-scale by carrying out the reaction in 6-bromo-2-naphthol. This halogenation reaction also proceeds in excellent conditions by first preparing the iodine(III)-based chlorinating reagent. Our new chlorinating reagent can be stored at least for two weeks at 4 °C without losing its reactivity.  相似文献   

    

Enrique Saldívar‐Guerra  Almendra Ordaz‐Quintero  Ramiro Infante‐Martínez  Jorge Herrera‐Ordóñez  Luis Villarreal‐Cárdenas  Diana Ramírez‐Wong  Evelia Rivera‐Rodríguez  Rodolfo Flores‐Flores  Luis Miramontes‐Vidal 《大分子反应工程》2016,10(2):91-91

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Claire L. Hobday  Ross J. Marshall  Colin F. Murphie  Jorge Sotelo  Tom Richards  Dr. David R. Allan  Prof. Tina Düren  Dr. François‐Xavier Coudert  Dr. Ross S. Forgan  Dr. Carole A. Morrison  Dr. Stephen A. Moggach  Dr. Thomas D. Bennett 《Angewandte Chemie (International ed. in English)》2016,55(7):2401-2405

Whilst many metal–organic frameworks possess the chemical stability needed to be used as functional materials, they often lack the physical strength required for industrial applications. Herein, we have investigated the mechanical properties of two UiO‐topology Zr‐MOFs, the planar UiO‐67 ([Zr₆O₄(OH)₄(bpdc)₆], bpdc: 4,4′‐biphenyl dicarboxylate) and UiO‐abdc ([Zr₆O₄(OH)₄(abdc)₆], abdc: 4,4′‐azobenzene dicarboxylate) by single‐crystal nanoindentation, high‐pressure X‐ray diffraction, density functional theory calculations, and first‐principles molecular dynamics. On increasing pressure, both UiO‐67 and UiO‐abdc were found to be incompressible when filled with methanol molecules within a diamond anvil cell. Stabilization in both cases is attributed to dynamical linker disorder. The diazo‐linker of UiO‐abdc possesses local site disorder, which, in conjunction with its longer nature, also decreases the capacity of the framework to compress and stabilizes it against direct compression, compared to UiO‐67, characterized by a large elastic modulus. The use of non‐linear linkers in the synthesis of UiO‐MOFs therefore creates MOFs that have more rigid mechanical properties over a larger pressure range.  相似文献   

    

M. S. R. Murty  Rayudu Venkateswara Rao  Kesur R. Ram  N. Rami Reddy  J. S. Yadav  B. Sridhar 《合成通讯》2013,43(19):2914-2921

Zinc-mediated facile and efficient chemoselective S-alkylation of 5-aryl 1,3,4-oxadiazole-2-thiols in the presence of a catalytic amount of tetra butyl ammonium iodide was described. The reaction was performed under neutral conditions. The chemoselectivity of the alkylation was confirmed by NMR spectroscopy and x-ray crystallography.  相似文献