Showing papers on "Ferrocene published in 2019"
TL;DR: It is reported that chiral 2-aryl ferrocene carboxylic acids, which are easily obtained from diastereoselective ortho lithiation and Suzuki–Miyaura coupling, can serve as external chiral sources for the Cp*CoIII-catalyzed enantioselectives C(sp3)–H amidation of α-aryl thioamides using dioxazolones.
78 citations
TL;DR: In this paper, a ferrocene-containing nucleic acid polymer was designed, and a size-tunable assembly system was developed to resolve the conflict between the enhanced permeability and retention (EPR) effect and spatially uniform penetration.
64 citations
TL;DR: In this article, the synthesis of ultra-thin two-dimensional metal-organic framework (MOF) nanosheets and loading of Pd nanoparticles through an in situ reduction strategy under mild conditions were reported.
Abstract: Metal nanoparticle-incorporated metal–organic framework (MOF) nanosheets have been deemed as a promising heterogeneous catalyst. We report the synthesis of ultra-thin two-dimensional MOF nanosheets and loading of Pd nanoparticles through an in situ reduction strategy under mild conditions. The obtained Pd@MOF showed high catalytic activity in hydrogenation reactions.
61 citations
04 Sep 2019
TL;DR: A series of ferrocene-based derivatives and their corresponding oxidized forms in which the introduction of simple electron donating groups like methyl or tert-butyl units on cyclopentadienyl-rings afford great tunability of Fe+III/Fe+II redox potentials are reported.
Abstract: We report a series of ferrocene-based derivatives and their corresponding oxidized forms in which the introduction of simple electron donating groups like methyl or tert-butyl units on cyclopentadi...
53 citations
TL;DR: In this paper, a ferrocene molecule was inserted into the nanocavity of sulfonated cyclodextrin intercalated layered double hydroxide (LDH-CD) via host-guest chemistry.
49 citations
TL;DR: In this paper, three new ferrocene-based thioureas with different chain lengths were synthesized, characterized, and tested as surface active agent, and the results obtained from these methods clearly revealed the linear dependency of inhibition potential with surface activity, concentration of inhibitor molecules as well as the temperature of the system.
40 citations
TL;DR: In this article, an aluminum(III) iso-propoxide complex supported by salfen was synthesized and characterized, which can be reversibly oxidized and reduced, and both redox species were surveyed as ring-opening polymerization catalysts for cyclic esters and cyclohexene oxide.
Abstract: An aluminum(III) iso‐propoxide complex supported by salfen (1, salfen=1,1′‐di(2,4‐bis‐tert‐butyl‐salicylimino)ferrocene) was synthesized and characterized. Compound 1 can be reversibly oxidized and reduced, and both redox species were surveyed as ring‐opening polymerization catalysts for cyclic esters and cyclohexene oxide. Based on the observed reactivity behavior, 1 could be used as a redox‐switchable catalyst for the formation of AB and ABC type di‐ and triblock copolymers of lactide, cyclohexene oxide, and trimethylene carbonate.
39 citations
TL;DR: In this article, a supercapacitor based on a glassy carbon electrode (GCE) modified with graphene oxide (GO) grafted ferrocene by ring opening polymerization (ROP) was developed.
35 citations
TL;DR: A facile approach was reported to synthesize β-cyclodextrin functionalized graphene that is bridged by 3,4,9,10-perylene tetracarboxylic acid (rGO-PTCA-CD) via a chemical route that involves the functionalization of rGO with PTCA followed by covalently cross-linking NH2-β-CD.
30 citations
TL;DR: C·SbF6 was able to interact with a range of neutral and anionic guests, with p-toluenesulfonate showing the strongest association constant, and redox potential of the cage was unperturbed upon the addition of guests.
29 citations
TL;DR: In this article, a magnetically recoverable Fe3O4@SiO2-BenzIm-Fc[Cl]/NiCl2 nanoparticle was also synthesized using a simple chemical coprecipitation approach.
TL;DR: Verification of synthesis, thickness, uniformity and stability of the fabricated FcAgCs/ITO thin-films were characterized and confirmed by UV, XRD, SEM and the scotch tape adhesion peel test.
TL;DR: Li et al. as discussed by the authors developed a novel nonenzymatic nanocomposite for xanthine (XA) detection, which combined with reduced graphene oxide (RGO) through the layer-by-layer self-assembly technology.
Abstract: Heteropolyacids (PMo6W6) and ferrocene (Fc) were assembled on the glassy carbon electrode for the first time by electrodepositon method, and further combined with reduced graphene oxide (RGO) through the layer-by-layer self-assembly technology, developing a novel non-enzymatic nanocomposite for xanthine (XA) detection. The detection signal of XA was greatly amplified on the Fc-PMo6W6/RGO nanocomposite modified electrode due to coexist of these three active components. As ferrocene and PMo6W6 all have relatively good electrochemical reversibility, fast electron transfer ability and generation of stable redox forms, meanwhile RGO can enlarge the active surface area of the electrode, increase the conductivity and load of ferrocene and PMo6W6. Under the optimized conditions, the developed nanocomposite modified electrode displayed superb sensing property towards xanthine with a widely linear range from 5.00 × 10−8 ∼ 2.03 × 10-3 M, along with a relatively low detection limit of 1.01 × 10-8 M. The modified electrode has good stability as it is prepared by the smart combination electrodeposition and layer-by-layer self-assembly. Additionally, the nanocomposite was applied in detecting xanthine in actual samples with acceptable results, demonstrating the feasibility of Fc-PMo6W6/RGO nanocomposite in routine testing xanthine to some extent.
TL;DR: In this article, the use of the alkaline-earth (Ae) metal-catalyzed dehydrocoupling of silanes and amines for the synthesis of ferrocene-containing polycarbosilazanes was reported.
TL;DR: The present demonstration of surface engineering of functional redox-active organometallic molecule can be efficient in the field of molecular electronics, surface-base redox chemistry, opto-electronic applications.
Abstract: Electroactive self-assembled monolayers (SAMs) bearing a ferrocene (Fc) redox couple were chemically assembled on H-terminated semiconducting degenerate-doped n-type Si(111) substrate. This allows to create a Si(111)|organic-spacer|Fc hybrid interface, where the ferrocene moiety is covalently immobilized on the silicon, via two alkyl molecular spacers of different length. Organic monolayer formation was probed by Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry (LA-ICP-MS) and X-ray photoelectron spectroscopy (XPS) measurements, which were also used to estimate thickness and surface assembled monolayer (SAM) surface coverage. Atomic force microscopy (AFM) measurements allowed to ascertain surface morphology and roughness. The single electron transfer process, between the ferrocene redox probe and the Si electrode surface, was probed by cyclic voltammetry (CV) measurements. CVs recorded at different scan rates, in the 10 to 500 mV s−1 range, allowed to determine peak-to-peak separation, half-wave potential, and charge-transfer rate constant (KET). The experimental findings suggest that the electron transfer is a one electron quasi-reversible process. The present demonstration of surface engineering of functional redox-active organometallic molecule can be efficient in the field of molecular electronics, surface-base redox chemistry, opto-electronic applications.
TL;DR: Interestingly, the inefficient quenching of CD fluorescence by these SCCs was found to be directly related to the angular disposition of the binding sites in the Pt(II) based organometallic clips.
Abstract: The synthesis and characterization of a new pyrazine-based ditopic organoplatinum(II) complex having a bite angle of 180° is reported. The facile and efficient syntheses are described of three discrete neutral Fe(II)/Pt(II) heterobimetallic SCCs with Pt(II) acceptor clips of different binding angles, 0, 120, and 180°. These new SCCs were characterized by multinuclear NMR and mass spectrometry. Electrochemical response of these ferrocene containing self-assembled ensembles was studied using cyclic voltammetry. The diplatinum acceptor organometallic clips significantly quench the fluorescence of highly emitting carbon quantum dots (CD), while the self-assembled macrocycles tend to nullify the quenching effect of the organometallic clips. Interestingly, the inefficient quenching of CD fluorescence by these SCCs was found to be directly related to the angular disposition of the binding sites in the Pt(II) based organometallic clips.
TL;DR: In this article, a ferrocene-based self-assembled monolayer on a regular glassy carbon electrode is used to modulate ion-transfer processes across nanometer-sized voltammetry membranes.
TL;DR: It is presented that the reduced graphene oxide (rGO) doped with nanometer-sized ferrocene moieties is a new, excellent active material for redox sensors and has demonstrated favorable sensitivity and selectivity of the designed biosensor for the detection of glucose.
TL;DR: In this article, the authors describe the covalent functionalization with ferrocene (Fc) of two graphene derivatives: graphene acid (GA), a graphene layer whose basal plane is modified with COOH groups, and graphene oxide (GO).
TL;DR: An 8-aminoquinoline-directed, copper/1,10-phenanthroline-mediated selective mono-organothiolation of the C-H bond in ferroceneamide has been developed using aryl/alkyl disulfide substrates and results in a broad functional group tolerance.
Abstract: An 8-aminoquinoline-directed, copper/1,10-phenanthroline-mediated selective mono-organothiolation of the C-H bond in ferroceneamide has been developed using aryl/alkyl disulfide substrates. The sequential ferrocene C-H organochalcogenation (chalcogen = S, Se, and Te) has also been established for the synthesis of novel hybrid unsymmetrical aryl chalcogenides with the aid of a catalytic amount of Cu(OAc)2 under ambient reaction conditions. The developed protocol results in a broad functional group tolerance to allow alkyl-, aryl-, heteroaryl-, bromo-, chloro-, and nitro-containing diorgano dichalcogenides as coupling partners. Furthermore, the 8-aminoquinoline directing group is easily removed to afford the aldehyde functionality after C-H organochalcogenation. A mechanistic understanding of the copper-mediated selective mono-organothiolation reaction suggests that the rigid bicoordinated 1,10-phenanthroline ligand and freshly generated copper(II) from Cu(I) in the less polar solvent acetonitrile are crucial to the selective mono-C-H functionalization of ferroceneamide.
TL;DR: In this paper, the diamino-aryl-1,4,5,8-naphtalenetetra-carboxylic diimide molecule (NTCDA-(aryl-NH2)2) was successfully prepared by N-acylation reaction of 1, 4, 5, 8-NN-CARB with 4-nitroaniline, followed by a simple reduction of nitro groups in amino functions.
TL;DR: It is found that ferrocene additive can effectively suppress the agglomeration of Sn/SnO2 and retain the nanoscale Sn/Li2O interface and thereby enhance the reversible capacity of SnO2-based anodes for lithium-ion batteries.
Abstract: Improving the reversibility of conversion reaction is a promising way to enhance the lithium-ion storage capability of SnO2-based anodes. Herein, we report ferrocene as a novel additive to improve ...
TL;DR: This work has developed routes to fluorine-containing di-, tri-, tetra- and penta-substituted ferrocene derivatives to extend the available chemical space and exploitation of the halogen 'dance' rearrangement in the ferrocenes series.
Abstract: In spite of the growing interest in fluorine-containing compounds, and the improvements in materials, optical and biological properties that can arise from substitution of a phenyl ring by ferrocene within a molecular scaffold, synthetic strategies that allow the efficient preparation of fluoroferrocene derivatives are scarce. Following conversion of ferrocene to fluoroferrocene, we have developed routes to fluorine-containing di-, tri-, tetra- and penta-substituted ferrocene derivatives to extend the available chemical space. Our approach is based on the identification of suitable reagents and conditions to achieve fluorine-directed deprotometalation, and exploitation of the halogen 'dance' rearrangement in the ferrocene series.
TL;DR: DFT calculations were used to capture the properties of redox-switchable metal complexes relevant to the ring-opening polymerisation of cyclic esters by varying the metals, donors, linkers, and substituents in both accessible ferrocene oxidation states.
09 Apr 2019
TL;DR: The data suggest that the ferrocene conjugates presented, either at position 3 or 16 of the estrogen, could serve as vectors and can be recognized by ERα as a delivery mechanism into the cell.
Abstract: Previously, ferrocene incorporation into the principal structural component of biologically active molecules resulted in enhanced cytotoxic activity against hormone-dependent MCF-7 and T-47D and hormone-independent MDA-MB-231 breast-cancer cell lines. Here we explore 4 new ferrocene estrogen conjugates at position 16 of the estrogen hormone and compared them to the previously reported ferrocene estrogen conjugate 3-ferrocenyl-estra-1,3,5(10)-triene-17β-ol. The ferrocene conjugate 16-ferrocenylidene-3-hydroxyestra-1,3,5(10)-trien-17-one was synthesized using estrone and ferrocene carboxaldehyde as starting materials in 86% yield. This ferrocene complex was used as the starting material for the synthesis of new ferrocene estrogen conjugates by a short linker group at position 16 of the estrogen hormone. The position and stereochemistry of the linker was verified by its crystal structure. The ferrocene redox behavior, in vitro studies on breast-cancer cell lines and docking studies on ERα are presented. The data suggest that the ferrocene conjugates presented, either at position 3 or 16 of the estrogen, could serve as vectors and can be recognized by ERα as a delivery mechanism into the cell. These new ferrocene hormone conjugates showed cytotoxic activity comparable to that of conventional therapeutic drugs such as tamoxifen and cisplatin.
TL;DR: The synthesis of (thiolfan*)Zr(NEt2)2 (Thiolfan* = 1,1'-bis(2,4-di-tert-butyl-6-thiophenoxy)ferrocene) and its catalytic activity for intramolecular hydroamination are reported.
TL;DR: An enantiopure helical ferrocene with five ortho-condensed aromatic rings was synthesized using a PtCl2-catalyzed cycloisomerization of planar-chiral 2-ethynyl-1-(4-phenanthrenyl)ferrocene ( Rp)-6f, prepared in 3 steps from known enantypure sulfinyl ferrocenyl boronic acid as the source of planAR chirality.
TL;DR: A new redox active coordination polymer was synthesized by the diffusion method and characterized by single-crystal X-ray diffraction, exhibiting water-induced crystal-to-amorphous transformation with chromotropism and evaluated as electrode materials for supercapacitors.
Abstract: A new redox active coordination polymer [Co(H2O)2(Fc(PHOO)2)·2H2O]n (Fc = ferrocene) was synthesized by the diffusion method and characterized by single-crystal X-ray diffraction. Phosphinate fragments formed infinite chains connected through ferrocene fragments to 2D PCP associated with cobalt atoms. Additional strong hydrogen bonding via the participation of coordinated and lattice water molecules resulted in the formation of a 3D network. The polymer exhibited water-induced crystal-to-amorphous transformation with chromotropism, as confirmed by spectroscopic techniques, elemental analysis, TGA and XRPD. The explosion of the amorphous phase [Co(Fc(PHOO)2)]n to form water vapor readily led to its conversion into the initial crystalline [Co(H2O)2(Fc(PHOO)2)·2H2O]n with a reverse change of color. The dehydrated form of the polymer selectively sorbed water and could be used as a material with the function of an express dehydrator. Moreover, a modified electrode could qualitatively determine the water content in the solvent at a concentration of 0.05%. Both hydrated and dehydrated forms were evaluated as electrode materials for supercapacitors. The [Co(Fc(PHOO)2)]n (dehydrated form) electrode exhibited high specific capacitance and excellent cycling stability. Its maximum specific capacitance was 2517 F g−1 at a current density of 2 A g−1, and the specific capacitance retention was about 90.1% after 1000 cycles.