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Zinc Rhodium Oxide and Its Possibility as a Constituent Photocatalyst for Carbon Dioxide Reduction using Water as an Electron Source
摘要： We evaluated the potential of zinc rhodium oxide (ZnRh2O4) as a carbon dioxide (CO2) reduction photocatalyst with the aid of triethanolamine (TEOA) as an electron donor and demonstrated that ZnRh2O4 was able to reduce CO2 to carbon monoxide (CO) under infrared light. Gold (Au) loading onto ZnRh2O4 greatly enhanced the CO2 reduction activity. Also, CO2 reduction was examined over a composite of ZnRh2O4 and bismuth vanadium oxide (Bi4V2O11) with inserted Au (ZnRh2O4/Au/Bi4V2O11) using H2O as the electron source, which led to the successful evolution of CO.
关键词： Carbon monoxide,Methane,Triethanolamine,Gold,Carbon dioxide reduction,Zinc rhodium oxide
更新于2025-11-19 16:51:07
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Regiodivergent Hydroaminoalkylation of Alkynes and Allenes via a Combined Rhodium and Photoredox Catalytic System
摘要： A rhodium/photoredox dual catalyzed regiodivergent α-allylation of amines is described. As an atom-economic and efficient method, alkynes and allenes are used as allylic electrophile surrogates in this novel protocol. With different reaction conditions, synthetic useful branched or linear homoallylic amines could be synthesized in good to excellent yields and regioselectivity. This straightforward strategy complements the traditional transition-metal catalyzed allylation reactions.
关键词： amine,alkyne,rhodium,allylation,photoredox
更新于2025-09-23 15:22:29
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Rhodium-Catalyzed C–H Functionalization of Silicon-Substituted Alkanes
摘要： Harnessing the β-Silicon Effect for Regioselective and Stereoselective Rhodium(II)-Catalyzed C–H Functionalization by Donor/Acceptor Carbenes Derived from 1-Sulfonyl-1,2,3-triazoles
关键词： alkylsilanes,rhodium catalysis,sulfonyltriazoles,C–H functionalization
更新于2025-09-19 17:15:36
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A Facile and Versatile Synthesis of Enda??Functionalized Poly(phenylacetylene)s: A Multicomponent Catalytic System for Wella??Controlled Living Polymerization of Phenylacetylenes
摘要： A rhodium-based multicomponent catalytic system for well-controlled living polymerization of phenylacetylenes has been developed. The catalytic system is composed of easily available and bench-stable [Rh(nbd)Cl]2, aryl boronic acid derivatives, diphenylacetylene, 50% aq KOH, and PPh3. This system offers a method for facile and versatile synthesis of various end-functionalized cis-stereoregular poly(phenylacetylene)s because components from aryl boronic acids and diphenylacetylene were introduced to the initiating end of the polymers. The polymerization reaction shows a typical living nature with a high initiation efficiency, and the molecular weight of the resulting poly(phenylacetylene)s can be easily controlled with very narrow molecular weight distributions (Mw/Mn = 1.02–1.09). The experimental facts suggest that the present catalytic system has the higher polymerization activity than the polymerization activities of other rhodium-based catalytic systems previously reported.
关键词： Living polymerization,Rhodium,Boronic acids,Phenylacetylenes,Polymers
更新于2025-09-19 17:13:59
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A Facile and Versatile Synthesis of End-Functionalized Poly(phenylacetylene)s: A Multicomponent Catalytic System for Well-Controlled Living Polymerization of Phenylacetylenes
摘要： A rhodium-based multicomponent catalytic system for well-controlled living polymerization of phenylacetylenes has been developed. The catalytic system is composed of easily available and bench-stable [Rh(nbd)Cl]2, aryl boronic acid derivatives, diphenylacetylene, 50% aq KOH, and PPh3. This system offers a method for facile and versatile synthesis of various end-functionalized cis-stereoregular poly(phenylacetylene)s because components from aryl boronic acids and diphenylacetylene were introduced to the initiating end of the polymers. The polymerization reaction shows a typical living nature with a high initiation efficiency, and the molecular weight of the resulting poly(phenylacetylene)s can be easily controlled with very narrow molecular weight distributions (Mw/Mn = 1.02–1.09). The experimental facts suggest that the present catalytic system has the higher polymerization activity than the polymerization activities of other rhodium-based catalytic systems previously reported.
关键词： Living polymerization,Phenylacetylenes,Rhodium,Polymers,Boronic acids
更新于2025-09-19 17:13:59
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Computation-led design of pollutant gas sensors with bare and carbon nanotube supported rhodium alloys
摘要： Quantum chemical study has been performed on finite-sized bi-metallic Rh3M alloys, M = Ag, Ir, Pd, Pt, Au, derived from magic cluster, Rh4. Bond length of C–O and N–O are noticed to be elongated in the presence of rhodium alloy clusters. CO2 and NO2 gases are found to be highly adsorbed on Rh3M clusters, which is confirmed by stretching frequency of C–O and N–O. DFT evaluated dipole moment and electronic charge redistribution suggests the sensing capability of CO2 and NO2 gases by Rh3M clusters which is further confirmed by the calculated HOMO–LUMO gap. Mixed rhodium alloy clusters supported on single-wall carbon nanotube (SWCNT) exhibits much higher ability to sense CO2 and NO2. On the other hand, SWCNT@Rh3M shows higher catalytic activity for the activation of CO2 and NO2 in comparison to bare Rh3M because of the higher electronic charge redistribution in the case of SWCNT@Rh3M. In case of SWCNT-supported gas adsorbed clusters, p electrons play a major role in bonding.
关键词： SWCNT,Rhodium,DFT,Alloy,CO2,NO2
更新于2025-09-16 10:30:52
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The UV Plasmonic Behavior of Rhodium Tetrahedrons—A Numerical Analysis
摘要： Rhodium (Rh) nanoparticles have attracted a lot of attention due to their strong and ambient-stable UV plasmonic response. Very recently, the synthesis of Rh tetrahedra with and without concave defect-rich surfaces serving in plasmon assisted photocatalytic energy conversion has been reported. In this work, we perform a systematic numerical study on plasmonic behavior and surface charge distribution in order to optimize the use of Rh tetrahedra in surface-enhanced spectroscopies and photocatalysis. We analyze the effect of the edges and corners reshaping, a deformation already reported to appear in Rh nanocubes which have been repeatedly re-used in photocatalytic processes. It is demonstrated that rounding the edges and corners weakens both the near-field enhancement and surface charge densities in these locations, which in turn are the more reactive regions due to the presence of uncoordinated sites. In addition, we study how the near-field and charge density is redistributed on the surface of the tetrahedra when concavities of different sizes and depths are introduced. Through this study, we show that, in order to simultaneously maximize the near-field enhancement and surface charge densities in the concavity and at external edges and corners, medium size deep concavities are needed.
关键词： rhodium,photocatalysis,nanoparticles,UV plasmonics,tetrahedron
更新于2025-09-12 10:27:22
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[IEEE 2019 28th Wireless and Optical Communications Conference (WOCC) - Beijing, China (2019.5.9-2019.5.10)] 2019 28th Wireless and Optical Communications Conference (WOCC) - Crosstalk Prediction of Cables Based on Cosserat Elastic Rod Theory
摘要： A rhodium(III)-catalyzed domino annulation of simple olefins with diazo oxindoles to give spirooxindole pyrrolone products is described. This reaction can be formally viewed as the result of an anomalous tandem C(cid:2)H activation, carbene insertion, Lossen rearrangement, and a nucleophilic addition process. The potential utility of this reaction was further demonstrated by the late-stage diversification of drug molecules.
关键词： Lossen rearrangement,olefins,rhodium catalysis,oxindoles,C(cid:2)H activation
更新于2025-09-11 14:15:04
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23.5: Improvement of Ambient Contrast of Micro‐LED Devices with High Reliability
摘要： Rhodium (Rh)-catalysed [4 + 2] annulation of aromatic oximes with common terminal alkenes for the synthesis of 3,4-dihydroisoquinolines is presented. Through the cooperation of a Rh (III) catalyst and a catalytic amount of K2HPO4 base, the reaction enables the formation of two new bonds, a C(sp2)(cid:0) C(sp3) bond and a C(sp3)(cid:0) N bond, in a single reaction via functionalization of both the C(cid:0) H and N(cid:0) O bonds and provides a practical method to produce 3,4-dihydroisoquinolines with exquisite selectivity and excellent compatibility of functional groups.
关键词： oximes,dihydroisoquinolines,cyclization,rhodium,annulation,alkenes
更新于2025-09-11 14:15:04
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Selective Photocatalytic C-F Borylation of Polyfluoroarenes by Rh/Ni Dual Catalysis Providing Valuable Fluorinated Arylboronate Esters
摘要： A highly selective and general photocatalytic C-F borylation protocol that employs a rhodium biphenyl complex as a triplet sensitizer and the nickel catalyst [Ni(IMes)2] (IMes = 1,3-dimesitylimidazolin-2-ylidene) for the C-F bond activation and defluoroborylation process is reported. This tandem catalyst system operates with visible (blue, 400 nm) light and achieves borylation of a wide range of fluoroarenes with B2pin2 at room temperature in excellent yields and with high selectivity. Direct irradiation of the intermediary C-F bond oxidative addition product trans-[NiF(ArF)(IMes)2] leads to very fast decomposition when B2pin2 is present. This destructive pathway can be bypassed by indirect excitation of the triplet states of the nickel(II) complex via the photoexcited rhodium biphenyl complex. Mechanistic studies suggest that the exceptionally long-lived triplet excited state of the Rh biphenyl complex used as the photosensitizer allows for efficient triplet energy transfer to trans-[NiF(ArF)(IMes)2], which leads to dissociation of one of the NHC ligands. This contrasts with the majority of current photocatalytic transformations, which employ transition metals as excited state single electron transfer agents. We have previously reported that C(arene)-F bond activation with [Ni(IMes)2] is facile at room temperature, but that the transmetalation step with B2pin2 is associated with a high energy barrier. Thus, this triplet energy transfer ultimately leads to a greatly enhanced rate constant for the transmetalation step and thus for the whole borylation process. While addition of a fluoride source such as CsF enhances the yield, it is not absolutely required. We attribute this yield-enhancing effect to (i) formation of an anionic adduct of B2pin2, i.e. FB2pin2-, as an efficient, much more nucleophilic {Bpin-} transfer reagent for the borylation/transmetalation process, and/or (ii) trapping of the Lewis acidic side product FBpin by formation of [F2Bpin]- to avoid the formation of a significant amount of NHC-FBpin and consequently of decomposition of {Ni(NHC)2} species in the reaction mixture.
关键词： C-F Bond Activation,Nickel Complex,N-Heterocyclic Carbene,Borylation,Aryl Boronate,Photocatalysis,Rhodium Complex,Fluoroarene
更新于2025-09-09 09:28:46