Day: July 21, 2021

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This study describes the molecular-level design of a new type of filtration membrane made of crosslinked cyclodextrins?inexpensive macrocycles of glucose, shaped like hollow truncated cones. The channel-like cavities of cyclodextrins spawn numerous paths of defined aperture in the separation layer that can effectively discriminate between molecules. The transport of molecules through these membranes is highly shape-sensitive. In addition, the presence of hydrophobic (cavity) and hydrophilic (ester-crosslinked outer part) domains in these films results in high permeances for both polar and nonpolar solvents.

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Reference：
Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion

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An efficient synthetic approach to the synthesis of ferrocenyl heterocyclic derivatives in dilute solutions has been developed. The new compounds were characterised by means of IR, UV, and 1H NMR, spectroscopy and elemental analysis. The structure of complex I was studied by X-ray single-crystal diffraction. The synthesized compounds have a potential of new enzyme models and molecular recognition hosts.

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Reference：
Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion

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Hydrogen peroxide (H2O2) is an important target material for detecting biomolecules including acetylcholine (ACh), glutamate (Glu), and glucose. In this study, we report on H2O2 detection under biological environments based on the redox reaction. The redox potential change caused by the reaction between the electron mediators of ferrocenes and H2O2 catalyzed by horseradish peroxidase (HRP) was measured using a gold electrode connected to a source follower circuit. The mediators were either dissolved in sample solutions using ferrocenyl methanol (FcMeOH) or immobilized on the sensor surface in the form of 11-ferrocenyl-1- undecanethiol (11-FUT). H2O2 detection under biological environments was demonstrated in both samples. The overall outputs in the 11-FUT-immmobilzed electrodes were lower than those in the samples with dissolved FcMeOH. The detection range of H2O2 was from 10-5 to 10-3 M for the samples with dissolved FcMeOH, while it was from 10-4 to 10-2 M for the 11-FUT-immobilized electrodes. It was suggested that the oxidation of the mediators by H2O2 insufficiently took place in the 11-FUT-immobilized electrodes, leading to the lower outputs.

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Reference：
Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion

SDS of cas: 1273-94-5, Chemistry graduates have much scope to use their knowledge in a range of research sectors, including roles within chemical engineering, chemical and related industries, healthcare and more. 1273-94-5, Name is 1,1′-Diacetylferrocene, molecular weight is 262.0412. In an Article，once mentioned of 1273-94-5

Grafting Ti(=NtBu)(Me2Pyr)2(py)2 (Me2Pyr= 2,5-dimethylpyrrolyl, py=pyridine) onto the surface of silica partially dehydroxylated at 700 C gives the well-defined silica-supported Ti imido complex (?SiO)Ti(=NtBu)(Me2Pyr)(py)2, which is fully characterized by IR and solid-state NMR spectroscopy as well as elemental and mass balance analyses. While stoichiometric imido-transfer reactivity is typical for Ti imides, the obtained surface complex is unique in that it enables catalytic transformations involving Ti imido and oxo intermediates. In particular, it efficiently catalyzes imidation of carbonyl compounds with N-sulfinylamines by oxo/imido heterometathesis.

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Reference：
Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion

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The surface of a platinum electrode has been modified with platinum nanoparticles (PtNPs) and the enzyme sulfite oxidase (SOx), was entrapped on its surface in an ultrathin polypyrrole (PPy) film. The PtNPs, with a diameter of 30?40 nm, were deposited on the Pt electrode by cycling the electrode potential 20 times from -200 to 200 mV at a sweep rate of 50 mV.s-1. Morphological evidence of the successful incorporation of SOx and the presence of PtNPs were obtained by scanning electron microscopy. Also, the electrochemical behavior of the PtNPs/PPy-SOx film was examined by cyclic voltammetry, chronopotentiometry, electrochemical impedance spectroscopy and potentiometry. Under optimized conditions, the biosensor achieved a sensitivity of 57.5 mV.decade-1, a linear response that extends from 0.75 to 65 muM of sulfite, a detection limit of 12.4 nM, and a response time of 3?5 s. The biosensor was successfully applied to the determination of sulfite in wine and beer samples. [Figure not available: see fulltext.]

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Reference：
Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion

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Scanning electrochemical microscopy (SECM) and copper staining are combined to achieve visualisation of proteins on surfaces. Proteins are adsorbed on a polyvinylidene fluoride (PVDF) membrane or on a polyethylene terephthalate (PET) surface and stained using a standard protocol involving copper salts. Salts are then reduced to copper and detected by SECM with ferrocene methanol as a redox mediator in aqueous solution. During the SECM scan, the potential is held at a value at which the oxidation of the redox mediator occurs and a positive feedback current is detected when scanning over copper clusters. A negative feedback is observed elsewhere. This method enables unspecific protein adsorption mapping on polymeric membranes and into microchannels without any requirement of enzymatic activity or affinity to a labelled secondary reporter.

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Reference：
Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion

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Electrical properties, such as charge propagation, dielectrics, surface potentials, conductivity, and piezoelectricity, play crucial roles in biomolecules, biomembranes, cells, tissues, and other biological samples. However, characterizing these electrical properties in delicate biosamples is challenging. Atomic Force Microscopy (AFM), the so called ?Lab on a Tip? is a powerful and multifunctional approach to quantitatively study the electrical properties of biological samples at the nanometer level. Herein, the principles, theories, and achievements of various modes of AFM in this area have been reviewed and summarized. Statement of Significance: Electrical properties such as dielectric and piezoelectric forces, charge propagation behaviors play important structural and functional roles in biosystems from the single molecule level, to cells and tissues. Atomic force microscopy (AFM) has emerged as an ideal toolkit to study electrical property of biology. Herein, the basic principles of AFM are described. We then discuss the multiple modes of AFM to study the electrical properties of biological samples, including Electrostatic Force Microscopy (EFM), Kelvin Probe Force Microscopy (KPFM), Conductive Atomic Force Microscopy (CAFM), Piezoresponse Force Microscopy (PFM) and Scanning ElectroChemical Microscopy (SECM). Finally, the outlook, prospects, and challenges of the various AFM modes when studying the electrical behaviour of the samples are discussed.

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Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion

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ATR-X (alpha-thalassemia/mental retardation X-linked) syndrome is caused by mutations in chromatin remodeler ATRX. ATRX can bind the variable number of tandem repeats (VNTR) sequence in the promoter region of the alpha-globin gene cluster. The VNTR sequence, which contains the potential G-quadruplex-forming sequence CGC(GGGGCGGGG)n, is involved in the downregulation of alpha-globin expression. We investigated G-quadruplex and i-motif formation in single-stranded DNA and long double-stranded DNA. The promoter region without the VNTR sequence showed approximately twofold higher luciferase activity than the promoter region harboring the VNTR sequence. G-quadruplex stabilizers hemin and TMPyP4 reduced the luciferase activity, whereas expression of ATRX led to a recovery in reporter activity. Our results demonstrate that stable G-quadruplex formation by the VNTR sequence downregulates the expression of alpha-globin genes and that ATRX might bind to and resolve the G-quadruplex.

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Reference：
Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion

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Closely spaced 0.2-1 num, Au microelectrodes (50 num long, 1-2 num wide, and 0.1 num thick) on Si3N4 can be functionalized with poly (viniylferrocene), PVFc +/0, or with an N,N’-dibenzyl-4,4′-bipyridinium-based polymer, (BPQ2+/+)n’ derived from hydrolysis of N,N’-bis<(p-trimethoxysilyl)benzyl>-4,4′-bipyridinium (I).Two- or eight-microelectrode arrays have been functionalized with PVFc+/0 or (BPQ2+/+)n.Adjacent microelectrodes can be connected with either polymer in the sense that net current can pass from one microelectrode to another, through the polymer,when one electrode is held at a potential where the polymer is oxidized and the other electrode is held at a potential where the polymer is reduced.From such steady-state current an estimate of the diffusion coefficient for charge transport, DCT, in the polymer can be made; values in the range 10-9 – 10-10 cm2/s are found and accord well with earlier measurements of DCT for the polymers studied.A two-terminal diode can be fabricated by coating one electrode with (BPQ2+/+)n and an adjacent electrode with PVFc+/0 such that there is a connection between the microelectrodes via the (BPQ2+/+)n/PVFc+/0 contact.Current passes when the applied potential is such that the negative lead is attached to the (BPQ2+/+)n-coated electrode and the positive lead is attached to the PVFc+/0-coated electrode.When the applied potential approaches the difference in the Eo’s of the two polymers, current flows with the crucial feature being a downhill (by ca. 0.9 V) cross redox at the (BPQ2+/+)n/PVFc+/0) interface, BPQ+ + Fc+ –> BPQ2+ +Fc0.Current does not flow between the microelectrodes when the applied is in the opposite sense, because the reaction BPQ2+ + Fco –> BPQ+ + Fc+ is uphill by ca. 0.9 V.The switching time of a microelectrochemical diode is controlled by the time required to oxidize and reduce the polymers.

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Reference：
Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion

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Herein, we report the electrocatalytic voltammetry of holo and heme-free human sulfite oxidase (HSO) mediated by the synthetic iron complexes 1,2-bis(1,4,7-triaza-1-cyclononyl)ethane iron(III) bromide, ([Fe(dtne)]Br3.3H2O), potassium ferricyanide (K3[Fe(CN)6]), and ferrocene methanol (FM) at a 5-(4?-pyridinyl)-1,3,4-oxadiazole-2-thiol (Hpyt) modified gold working electrode. Holo HSO contains two electroactive redox cofactors, comprising a mostly negatively charged cyt b5 (heme) domain and a Mo cofactor (Moco) domain (the site of sulfite oxidation), where the surface near the active site is positively charged. We anticipated different catalytic voltammetry based on either repulsive or attractive electrostatic interactions between the holo or heme-free enzymes and the positively or negatively charged redox mediators. Both holo and heme-free HSO experimental catalytic voltammetry has been modeled by using electrochemical simulation across a range of sweep rates and concentrations of substrate and both positive and negatively charged electron acceptors ([Fe(dtne)]3+, [Fe(CN)6]3? and FM+), which provides new insights into the kinetics of the HSO catalytic mechanism. These mediator complexes have almost the same redox potential (all lying in the range +415 to +430 mV vs. NHE) and, thus, deliver the same driving force for electron transfer with the Mo cofactor. However, differences in the electrostatic affinities between HSO and the mediator have a significant influence on the electrocatalytic response.

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Reference：
Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion