bluuebunny/crossref_metadata_2025_split huggingface dataset:
Nitrogen‐Functionalized Active Carbon‐Supported Non‐Noble Nickel Nanoparticles with High Dispersity and Enhanced Catalytic Performance in Nitro Naphthalene Hydrogenation
Authors: Xiong Wei , Wang Liping , Cai Guoxiao , Yang Yongzhe , Hao Fang , Liu Pingle , Luo Hean 
Published: December 2017

AbstractNitrogen‐functionalized active carbons were prepared by post‐treatment method and used as supports for loading nickel to prepare liquid‐phase hydrogenation catalysts. The post‐treatment conditions were investigated, and these nitrogen‐functionalized active carbons supported nickel catalysts were characterized and used in the nitro naphthalene compounds hydrogenation. The characterization results show that the nitrogen‐functionalized active carbon prepared at 800 oC (N‐AC‐800) shows higher nitrogen content and pyridinic nitrogen species. And its supported nickel catalyst (Ni/N‐AC‐800) shows the most finely and extremely dispersion of nickel nanoparticles, the highest content of Ni0, and the largest metallic surface areas and the best H2 uptake quantity. Moreover, Ni/N‐AC‐800 also shows the best catalytic performance in nitro compounds hydrogenation reaction. The yield of 1,5‐diaminonaphthalene reaches to 94.75%, and the catalyst could be recycled for four times and maintained stable catalytic performance. Ni/N‐AC‐800 also shows good catalytic performance in 1‐nitronaphthalene and 1,8‐dinitronaphthalene hydrogenation.
Catalytic Fate of Two Copper Complexes towards Phenoxazinone Synthase and Catechol Dioxygenase Activity
Authors: Garai Mamoni , Dey Dhananjay , Yadav Hare Ram , Choudhury Angshuman Roy , Maji Milan , Biswas Bhaskar 
Published: December 2017

AbstractIn this present work, we report the synthesis and structural characterization of two copper(II) complexes, [Cu(bpy)Cl2] (1) & [Cu(μ‐Cl)(phen)Cl]2 (2) [bpy=2,2′‐bipyridine; phen=1,10‐phenanthroline]. We have also studied their catalytic fate towards phenoxazinone synthase and catechol dioxygenase activity. X‐ray structural analyses revealed that 1 & 2 crystallize in triclinic & monoclinic system with P 1 and Cc space group respectively. The copper complexes catalyse the oxidative coupling of 2‐amino phenol (2‐AP) to aminophenoxazin‐3‐one with significant turn over number, kcat(h−1)=2.08×103 & 2.16×103 for 1 & 2 resectively. During investigation of catechol dioxygenase activity, stoichiometric addition of 1 & 2 to 3,5‐di‐tert‐butylcatechol (DTBC) in acetonitrile produce in situ catecholate‐to‐Cu(II) absorption bands at 812 and 821 nm respectively. The in situ Cu(II)‐catecholate species for both 1 & 2 react with molecular oxygen at the rate, kobs: 7.95×10−4 and 1.30×10−3 min−1 respectively and produce intradiol cleavage products in exclusive amount. Minor amount of benzoquinone is also found in solution. Intradiol products are found as major product in solution and accounts in favour of substrate activation mechanism.
Catalytic Conversion of Bamboo Meal to High‐Yield Furfural With Solid Acid Catalyst FePO4⋅2H2O
Authors: Ye Jun , Zhou Minghao , Wang Kui , Chen Shuigen , Xu Junming , Jiang Jianchun 
Published: December 2017

AbstractFurfural has been identified as an attractive platform chemical for production of valuable bio‐based chemicals and bio‐fuels. Therefore, to exploit a new catalyst which directly synthesized furfural from biomass was meaningful. In this work, FePO4⋅2H2O was novelty applied in H2O/THF solvent system to produce furfural from bamboo meal. The influence of catalyst type, solvent type, catalyst dosage, reaction temperature and times on furfural production was comparatively evaluated. The results indicated that the FePO4 catalyst displayed an excellent catalytic activity over mineral acids, metal chlorate and solid acids, achieving the highest furfural yield of 90.5% (from d‐xylose) and 83.1 mol % (from bamboo meal) at 170 °C (60 min) and 180 °C (60 min), respectively. Moreover, characterization indicated that FePO4 can recrystallize after the reaction, which provided a convenience for the catalyst recovery. Considering the excellent catalytic activity and recovering characteristic of FePO4 catalyst, systematical research of this new technique was required before the process could be considered as an industrial scale.
Vanadium Cluster‐Based Inorganic‐Organic Covalent Hybrids: Synthesis, Structure and In Vitro Antioxidant Properties
Authors: Reddy Pulikanti Guruprasad , Angajala Gangadhara , Matharoo Navneet , Pradeep Chullikkattil P. 
Published: December 2017

AbstractA new family of [V6O19]8− cluster based covalent hybrids containing Tris functionalized (Tris=tris(hydroxymethyl)aminomethane) organic motifs such as naphthalene, quinoline and carbazole have been synthesized and characterized. These new vanadium cluster hybrids exhibited remarkable in vitro antioxidant properties under standard experimental conditions. The covalent grafting of the organic units enhanced the antioxidant properties of the hybrids in comparison to the starting compound, [H3V10O28]3−. The antioxidant properties exhibited by these hybrids correlated well with their reducing powers.
Induction of Supramolecular Helical Handedness in a Chemical Reaction Directed Self‐Healable Soft Material
Authors: Reja Antara , Biswas Ankan , Yadav Jonu , Dev Dharm , Das Apurba K. 
Published: December 2017

AbstractThixotropic and self‐healable supramolecular gel with nanohelical morphological features of discotic C3 symmetric benzene‐1,3,5‐tricarboxylic acid coupled with (L)‐ and (D)‐phenylalanine were achieved by hydroxyl anion catalysed methyl ester hydrolysis in presence of lithium ions. The hydrolysis of methyl ester and subsequent formation of gel are highly dependent on metal ions. The arrangement of the molecular building blocks and increasing the structural complexity during the origin of the supramolecular structures from the monomeric units by a chemical reaction act as the executive parameters to determine the handedness of macroscopic chirality.
Green Synthesis of Triaryl Phosphates with POCl3 in Water
Authors: Huang Xiaodong , Zhao Xinye , Zhang Mengyu , Xu Yang , Zhi Huizhen , Yang Jinfei 
Published: December 2017

AbstractThe facile synthesis of triaryl phosphates by using POCl3 and phenols under mild conditions is a great challenge for both chemical industry and organic chemistry. Especially for the reaction of functionalized phosphorus oxychloride in water, which has long been considered impossible due to its quickly hydrolysis, the fact that makes phosphorus oxychloride serve as a type of popular starting material commonly appeared in organic solvents. Herein, a feed‐controlled substitution reaction with POCl3 in water was investigated and 97% isolated yield of triphenyl phosphate (TPP) was obtained on the kilogram scale. A broad scope of triaryl phosphates can be prepared in good yields under mild conditions without using any catalysts. The presence of appropriate amount of water could significantly promote the reaction efficiency.
Nitrogen‐Doped Porous Carbon as High‐Performance Cathode Material for Lithium‐Sulfur Battery
Authors: Liu Chang , Yin Zong‐Jie , Deng Heming , Liu Cui , Zhao Jinxing , Lan Qian , Tang Shun , Liang Jiyuan , Cheng Qi , Liu Jiyan , Cao Yuan‐Cheng , Liu Zhihong 
Published: December 2017

AbstractLithium sulfur is considered as one of the most potential candidate cathode material using in high‐energy lithium ion batteries. In this work, the N‐doped porous carbon spheres with an appropriate N doping (4.33 wt%) were synthesized by Pyrrole through the sulfuric acid triggered polymerization and carbonized directly. The diameter of obtained N‐doped porous carbon spheres was in the range of 100–500 nm, with the pore size of 2–20 nm. Nitrogen‐doped carbon/Sulfur cathode with 61.8 wt% sulfur content exhibits excellent performance in high‐energy lithium sulfur battery. The specific capacity reached 1660 mAh g −1 at 0.05 C and about 500 mAh g−1 at 2 C.
Enantioselective Synthesis of Optically Active O‐Benzoyl‐Protected α‐Hydroxyl‐β,γ‐Unsaturated Acids with Chiral Induction of (S)‐Glyceraldehyde Acetonide
Authors: Liu Ruiquan , Wang Lei , Li Qibo , Liao Min , Yang Zhikun , Huang Yun , Zheng Bing , Bian Qinghua , Wang Min , Liu Shangzhong 
Published: December 2017

Abstractα‐Hydroxyl‐β,γ‐unsaturated acids are usually present in biologically active natural products and medicines, and serve as valuable building blocks in synthetic organic chemistry. A new method for the synthesis of O‐benzoyl‐protected α‐hydroxyl‐β,γ‐unsaturated acids is presented. Chiral induction was achieved using (S)‐glyceraldehyde acetonide as chiral source together with ClTi(Oi‐Pr)3 as coordinating agent. The overall synthetic route included 6 simple steps, and six optically active O‐benzoyl‐protected α‐hydroxyl‐β,γ‐unsaturated acids 1 a‐1 f (99% ee) were prepared in up to 53% yield.
Green Route Biosynthesis of Shape‐Tunable ZnO Nanostructures and Their Photocatalytic Applications
Authors: Phukan Shreemoyee , Bomjen Peto , Shripathi Thoudinja , Rashid Md. Harunar 
Published: December 2017

AbstractHerein, we report the synthesis of ZnO nanostructures of different morphologies via a facile and efficient wet chemical approach using flower extract as capping agent under ambient conditions. The purified samples were characterized via UV‐vis spectroscopy, photoluminescence spectroscopy, X‐ray diffractometry, electron microscopy, and thermogravimetric analysis. The diffractograms revealed that the products are pure and are well crystallized in a hexagonal wurtzite structure. The electron microscopic results confirmed that varying the concentration of flower extract, size and shape of ZnO nanostructures could be tuned. Microscopic results also clearly revealed that the flower like three dimensional morphologies of ZnO transforms gradually to spherical shape with increase in flower extract concentration. The ZnO nanostructures exhibit excellent photocatalytic activities towards the degradation of cationic dyes such as methylene blue and rhodamine B under UV light irradiation indicating that the flower extract derived ZnO architecture is a promising material for removal of pollutants from waste water. The effect of reaction parameters such as shape, size and amount of catalyst on the photocatalytic degradation of dyes were also studied. The results revealed that the maximum decolorization of dyes occur with ZnO photocatalyst at basic pH under UV light irradiation. The ZnO nanostructures are highly stable and are reusable for successive batches without losing any photocatalytic activity.
Stimuli‐Responsive Polymeric Hydrogel‐Copper Nanocomposite Material for Biomedical Application and Its Alternative Application to Catalytic Field
Authors: Sharma Swati , Deepak  , Kumar Ashok , Afgan Shere , Kumar Rajesh 
Published: December 2017

AbstractNaturally occurring non‐toxic, biocompatible chitosan based hydrogel nanocomposite with copper nanoparticle was synthesized via in‐situ free radical polymerization using chitosan (CS) as substrate, acrylamide (Am) as monomer, copper nanoparticles (CuNPs), ammonium persulphate as an initiator and glutaraldehyde as a cross‐linking agent. The synthesized CS‐PAm‐CuNPs hydrogel nanocomposite was characterized by rheology studies, HRSEM & FT‐IR spectroscopy. It shows excellent swelling up to 300% in wide range of pH of 3–9 with good mechanical strength (exhibit 1380% stain value). Further, synthesized hydrogel nanocomposite was found to be a multi‐responsive due biomedical application and alternative application to catalytic field. The synthesized hydrogel‐nanocomposite showed 96% release of highly water soluble levofloxacin antibiotic drug in blood serum in controlled manner up to 30 h and its catalytic activity (90%). Successful reduction of 4‐nitrophenol into 4‐aminophenol in presence of hydrogel nanocomposite confirms its Catalytic property. This hydrogel nanocomposite catalyst was found to be ecofriendly and it can be reused after washing it with distilled water.
Slow Intermolecular Complexation–Decomplexation Exchanges of Cyclodextrins in Fullerene and Its Derivative Complexes
Authors: Ikeda Atsushi , Mae Tomoya , Sugikawa Kouta , Komaguchi Kenji , Konishi Toshifumi , Hirao Takehiro , Haino Takeharu 
Published: December 2017

AbstractFullerenes (C60 and C70) and several functionalized C60 derivatives can be encapsulated in two γ‐cyclodextrins (γ‐CDxs). Although intermolecular complexation–decomplexation exchange of γ‐CDx is known to be very slow, the exchange rates have yet to be quantitatively measured. Herein, we determined that the pseudo‐first‐order association and dissociation rate constants for the γ‐CDx2•C70 complex were 4.3 and 0.6 s−1 at 23 °C, respectively. In contrast, the intermolecular exchange rates for the γ‐CDx2•C60 and C60 derivative complexes were slower than the time scale of exchange spectroscopy NMR experiments and the exchange rate constants were in the order of 10−4 s−1. Furthermore, a γ‐CDx2•C60 derivative complex was shown to have different intermolecular exchange rates for the two γ‐CDxs depending on steric hindrance from the substituent on the C60 derivative.
Fabrication of TiO2/β‐Cyclodextrin Double‐Ring Composite and Its Photodegradation Performance
Authors: Jia Di , Wang Yu Lei , Yang Hua Gui 
Published: December 2017

AbstractOrganic‐inorganic TiO2/β‐cyclodextrin composite was synthesized through orienting hydrolysis of tetrabutyl titanate on the hydrophilic faces of β‐cyclodextrin vesicles with the assistance of trace water. The composite has a double‐ring structure, in which β‐cyclodextrin comprises the inner ring and TiO2 makes up the outer ring. The TiO2/β‐cyclodextrin composite with an “empty” inner ring was observed for the first time and it showed photodegradation performance of BPA under visible light irradiation.
Low Melting Tetracyanidoborate Salts with Alkyl‐, Arylammonium, and Pyridinium Cations: Syntheses, Structures, Properties.
Authors: Siegesmund Antje , Topp Anke , Nitschke Christian , Köckerling Martin 
Published: December 2017

AbstractThe syntheses and single crystal structures of five new tetracyanidoborate salts with N‐based cations are described. Three of these compounds contain cations with acidic H atoms. The H‐bond strength, expressed by D‐A distances is correlated with a shift of the CN stretching mode frequency in the IR spectra. Melting points are found between 59 °C and 214 °C, i. e. at the borderline between ionic liquids and molten salts. Isothermal annealing indicates slow decomposition. Solubility tests in polar solvents show a strong dependence on the cation.
Bronsted Basic Ionic Liquid as Catalytic and Reusable Media for Conjugate Cyanation of CF3‐Substituted Alkylidenemalonates Using Acetone Cyanohydrin
Authors: Jakhar Ajay , Ansari Amamudin , Nandi Sekhar , Gupta Naveen , Khan Noor‐ul H. , Kureshy Rukhsana I. 
Published: December 2017

AbstractA new class of CF3 substituted alkylidenemalonates were synthesized and used as a substrate for conjugate cyanation reaction. Ionic liquid has been used as an organocatalyst under solvent‐free and mild reaction conditions. The present protocol exhibited remarkable catalytic activity using a favourable cyanide source i. e. acetone cyanohydrin. Excellent yields were obtained for a wide range of substrates and the high reactivity is presumptively attributed to the basicity of an ionic liquid used. Mechanistic insights were studied using NMR spectroscopy and a probable catalytic cycle was proposed.
An Eco‐Sustainable Synthetic Approach for 4,5‐Dihydro‐1H‐pyrazoles via DBU Catalysis in Micellar Medium
Authors: Mishra Anu , Rai Pratibha , Pandey Yogesh K. , Singh Jaya , Singh Jagdamba 
Published: December 2017

AbstractAn efficient and straightforward synthetic strategy for pharmaceutically pertinent scaffold 4,5‐dihydro‐1H‐pyrazole has been reported initiating from highly substituted chalcones (1) and thiosemicarbazide (2) as reactants in an aqueous micellar medium by the use of DBU (1,8‐Diazabicyclo[5.4.0]undec‐7‐ene) as an organobase. The use of CTAB (Cetyl Trimethyl Ammonium Bromide) as a surfactant, which forms a colloidal dispersion with organic substrates with the enhancement of the reactivity of substrates is the key feature of this technique. Organic synthesis in aqueous micellar medium, use of organocatalyst DBU, mild reaction conditions, sustainable synthesis, experimental feasibility, broad substrate scope, short reaction time and high yields are some other attributes of this protocol.
Preparation and Evaluation of Edge Selective Sulfonated Graphene by Chlorosulfuric Acid as an Active Metal‐ Free Electrocatalyst for Oxygen Reduction Reaction in Alkaline Media
Authors: Abdolmaleki Amir , Mallakpour Shadpour , Mahmoudian Manzar 
Published: December 2017

AbstractIn this work, development of efficient metal‐free electrocatalyst for the application in the cathode of fuel cell was investigated by a modified graphene (edge‐selective sulfonated graphene), which was synthesized via a facile chemical procedure. Below, the delamination of three‐dimensional architectures graphite into two‐dimensional graphene nanoplates and the presence of sulfonic acid groups in sulfonated graphene (SG) are revealed by Fourier transform infrared spectroscopy (FT‐IR) and X‐ray photoelectron spectroscopy (XPS) techniques. Finally, the resulting edge SG is evaluated as the catalyst for the oxygen reduction reaction (ORR) in the alkaline media. It shows not only remarkable selectivity for ORR via a four‐electron pathway, but also a stable behavior as well as tolerance to the methanol crossover compared to platinum.
Design of Air and Moisture Stable Ruthenophane and Ruthenium(II)‐π Complexes and Study of Their Applications in Catalysis
Authors: Viji Mambattakkara , Tyagi Nidhi , Ramaiah Danaboyina 
Published: December 2017

AbstractHerein, we report the synthesis and characterization of two ruthenophane (1) and ruthenium(II)‐π (2) complexes, and the results of their catalytic applications under different conditions. These complexes exhibited excellent air and moisture stability due to the existence of effective cation‐π interactions between the metal ion and the aromatic surface of the ligand. These complexes were tested and compared in the transfer hydrogenation of acetophenone in 2‐propanol. The ruthenophane complex 1 exhibited highest efficiency in the catalytic transfer hydrogenation reaction when compared to the complex 2.The better efficiency of the complex 1 can be ascribed to the steric and cation‐π interactions of the cyclophane ligands with the metal centre under reaction conditions. Using catalyst loading of ca. 2 mol%, the transfer hydrogenation of the aromatic ketones having different substituents was achieved. Notably, these complexes exhibited high selectivity for the aromatic ketones having electronegative substituents and showed highest efficiency of ca. 100% under moderate reaction conditions when compared to the literature known ruthenium catalysts.
Synthesis, Aggregation, Antioxidant and DNA‐Binding Properties of Metallophthalocyanines Bearing 5‐Tert‐butyl‐2‐hydroxyphenoxy Groups
Authors: Ağırtaş Mehmet Salih , Cabir Beyza , Özdemir Sadin , Okumus Veysi , Arslantas Ali 
Published: December 2017

AbstractIn this study, the synthesis and characterization of new substituted metallophthalocyanines are described. A new phthalonitrile, 4‐(5‐tert‐butyl‐2‐hydroxyphenoxy)‐5‐chlorophthalonitrile (3) was prepared. New compounds were characterized by UV–Vis, IR, 1H NMR, and elemental analysis. The aggregation behavior of the cobalt (II), magnesium (II) and copper (II) phthalocyanines were studied in tetrahydrofuran and in known concentration ranges. The antioxidant activities of compounds were evaluated. Their radical‐scavenging capacity, metal chelating activity and reducing power was fully studied. The compound 3 showed 100% chelating activity as EDTA at concentration 50 mg/L. The DNA interaction of copper (II) phthalocyanine compound (6) was studied using UV/Vis titration, gel electrophoresis, cyclic voltammetry. The results indicated that compound 6 interacts with CT‐DNA via intercalation binding mode.
Bis‐Imine Boronic Esters Obtained by One‐Step Multicomponent Reactions. Synthesis and X‐Ray Diffraction Structural Analysis
Authors: Sánchez‐Portillo Paola , Barba Victor 
Published: December 2017

AbstractOne‐step multicomponent reactions were used for the synthesis of bis‐imine boronic esters (1 a–1 c and 2 a–2 c). Condensation reaction between benzene‐1,4‐diboronic acid, 2‐amino‐1,3‐diols (2‐amino‐1,3‐propanediol or 2‐amino‐2‐methyl‐1,3‐propanediol) and carboxyl‐ pyridines (2‐, 3‐ or 4‐pyridinecarboxaldehyde) offers stable boronic esters in good yields. X‐ray crystal analysis was done for all six compounds showing at supramolecular level the presence of numerous secondary interactions such as, C−H⋅⋅⋅O, C−H⋅⋅⋅N, C−H⋅⋅⋅ π hydrogen bonds and π⋅⋅⋅π stacking. The existence of these interactions gives place to 1D and 2D polymeric frameworks in solid state. It is noteworthy to remark the absence of the N→B coordination bond in either solution or solid state. All 2‐amino‐1,3‐propanediol derivatives (1 a–1 c) showed to be in a linear conformation while the 2‐amino‐2‐methyl‐1,3‐propanediol derivatives (2 a–2 c) were twisted to form a zig‐zag conformation. Additionally, 1 b was co‐crystallized with benzene‐1,4‐diboronic acid (1 b–Ac) and 2 a also was crystallized as solvate with toluene included at the unit cell (2 a–Tol). The X‐ray analysis reveals that the additional molecule (diboronic acid or toluene) not alter the whole conformation.
Preparation of Hierarchical MnCo2S4 Nanotubes for High‐Performance Supercapacitors and Non‐Enzymatic Glucose Sensors
Authors: Wie Chengzhen , Sun Yuting , Zhan Niannian , Liu Mengyao , Zhao Liyang , Cheng Cheng , Zhang Daojun 
Published: December 2017

AbstractHierarchical MnCo2S4 nanotubes have been successfully prepared via a facile self‐template approach. The as‐prepared hierarchical MnCo2S4 nanotubes are evaluated as electrode materials for supercapacitors, which exhibits a specific capacitance of 705.2 F g−1 at 0.5 A g−1 and a remarkable cycling performance. Moreover, the hierarchical MnCo2S4 nanotubes are also applied in non‐enzymatic glucose sensors, which possesses good electrocatalytic performances with a low determination limit (0.1 μM) and good selectivity. In addition, yolk‐shelled MnCo2O4 prisms were also prepared via the self‐template method. The electrochemical performance of the yolk‐shelled MnCo2O4 prisms were also studied. It is found that the as‐prepared hierarchical MnCo2S4 nanotubes show better electrochemical performances than yolk‐shelled MnCo2O4 in this work.
Porous Gold Nanotubes for Enhanced Methanol Oxidation Catalysis
Authors: Yin Xiuxiu , Teradal Nagappa L. , Jelinek Raz 
Published: December 2017

AbstractPorous gold nanostructures have attracted significant interest as conduits for catalysis in fuel cell applications. We synthesized new porous gold nanotubes through a simple process combining galvanic displacement of silver by gold thiocyanate [Au(SCN)4−], which in parallel underwent spontaneous crystallization/reduction. The porous Au nanotube electrodes featured high electrochemically‐active surface area and displayed excellent catalytic properties for methanol oxidation. The porous Au nanotube architecture was stable, recyclable, and could be readily employed as a catalytic platform in methanol fuel cells.
Multicomponent Methanolysis Reaction for the Synthesis Pyrrole and Pyrolizine Derivatives via Intermolecular (3 + 2) Cycloaddition
Authors: Shirsat Prashishkumar K. , Khomane Navnath B. , Mali Prakash R. , Maddi Raghavender Reddy , Nanubolu Jagadeesh Babu , Meshram Harshadas M. 
Published: December 2017

AbstractA transition‐metal‐free and a mild multicomponent methanolysis protocol has been developed to access pyrrole and pyrolizine derivatives from readily available substrates ninhydrin, alkyne and amine. The reaction works well with both primary and secondary amines with a simple variation in temperature. The reaction is proposed to go through a (3+2) cycloaddition reaction via azomethine ylide intermediate.