Oxidation of allyl alcohol by alkaline periodate in the presence of micro amounts of palladium(II)

Hiremath, G. A.; Timmanagoudar, P. L.; Nandibewoor, Sharanappa T.

doi:10.1002/(sici)1099-1395(199801)11:1<31::aid-poc968>3.0.co;2-7

Cited by 20 publications

(4 citation statements)

References 9 publications

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“…To further investigate such a conclusion, an in situ experiment was designed to explore further the chemical structure of PDA film. As already reported in the literature, the saturated KIO 4 can be used to oxidize alcohols into the corresponding carbonyls. In our case, we hypothesized that the PDA film obtained in Tris buffer consisting some OH groups, which is primarily expected for 5,6‐dihydroxyindoline and its derivative.…”

Section: Resultsmentioning

confidence: 81%

In Situ Infrared Spectroscopic Monitoring and Characterization of the Growth of Polydopamine (PDA) Films

Sun

Koch

et al. 2019

Physica Status Solidi (b)

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Modern infrared (IR) spectroscopic methods as in situ IR spectroscopic ellipsometry (in situ IRSE) and the photothermal atomic force microscopy (AFM)-IR technique are introduced as novel analysis methods for characterization of polydopamine (PDA) films. The visible (VIS) and IR ellipsometric studies serve for determination of thicknesses, IR optical constants and discussion of specific vibrational bands. The in situ IR ellipsometric studies (IRSE) of the thin film growth of polydopamine (PDA), a versatile material for bioactive surfaces, in tris(hydroxymethyl)aminomethane (Tris) buffer solution are used to monitor the time-dependent growth process of a PDA film. Complementary methods as X-ray photoelectron spectroscopy (XPS) and the nanoscale photothermal AFM-IR technique give access to study chemical homogeneity of the probed spots. All of the results are in qualitative agreement and show up new analysis possibilities, even further work is required to resolve the open questions of the chemical structure of PDA films. As proof of principle reaction for biosensor applications the binding of thiol-terminated molecules to the PDA film via Michael-addition was investigated by in situ IRSE.

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Section: Resultsmentioning

confidence: 81%

In Situ Infrared Spectroscopic Monitoring and Characterization of the Growth of Polydopamine (PDA) Films

Sun

Koch

et al. 2019

Physica Status Solidi (b)

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“…The data described above suggested to us that the as-prepared poly(dopamine) samples were composed primarily of noncovalent bonding interactions, including hydrogen bonding and charge transfer, as has been observed in other robust, synthetic or biological, supramolecular polymers and materials. − To further support such a noncovalent model, poly(dopamine) powder was reacted with aqueous sodium hypochlorite (NaOCl, 5–6%) or potassium periodate (KIO 4 , saturated solution), both of which are commonly used for oxidizing alcohols to their corresponding carbonyls. − We hypothesized that if poly(dopamine) was comprised of monomers bound by charge transfer, hydrogen bonding, or other supramolecular interactions (Figure ), oxidation of the mixture to the corresponding diones would be expected to degrade the polymer, allowing for analysis of small molecule products. Upon reaction with either of the aforementioned oxidants, the otherwise insoluble powder dissolved into the aqueous medium and transitioned from dark brown to clear and nearly colorless.…”

Section: Resultsmentioning

confidence: 97%

Elucidating the Structure of Poly(dopamine)

et al. 2012

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Herein we propose a new structure for poly(dopamine), a synthetic eumelanin that has found broad utility as an antifouling agent. Commercially available 3-hydroxytyramine hydrochloride (dopamine HCl) was polymerized under aerobic, aqueous conditions using tris(hydroxymethyl)aminomethane (TRIS) as a basic polymerization initiator, affording a darkly colored powder product upon isolation. The polymer was analyzed using a variety of solid state spectroscopic and crystallographic techniques. Collectively, the data showed that in contrast to previously proposed models, poly(dopamine) is not a covalent polymer but instead a supramolecular aggregate of monomers (consisting primarily of 5,6-dihydroxyindoline and its dione derivative) that are held together through a combination of charge transfer, π-stacking, and hydrogen bonding interactions.

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“…Its reactivity and biological effects are strongly influenced by the extent of it complexation with ligands . Pd (II) acts as a efficient catalyst in many redox reactions. − It is also reported that Palladium-based catalysts are found to have high catalytic activity in clean deionized water. The literature survey shows that there is no report on the kinetics and mechanism of oxidation of tetracycline hydrate using Cu(Bip) 2 2+ as oxidant and Pd(II) chloride as homogeneous catalyst.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of the Oxidation of Tetracycline Hydrate by Copper(II) Complexed with Bipyridyl in Alkaline Medium Using Chloro-Complex of Palladium(II) As Homogeneous Catalyst

Singh

Rahmani

et al. 2012

Ind. Eng. Chem. Res.

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The present paper deals with the kinetics and mechanism of Pd(II)-catalyzed oxidation of tetracycline hydrate by Cu(Bip)2 2+ in alkaline medium. First-order kinetics with respect to [tetracycline hydrate] and fractional positive order kinetics in [Cu(II)] and [Pd(II)] was observed. Nil effect of [OH–] and [bipyridyl] on the rate of oxidation was observed. Almost no effect of ionic strength as well as dielectric constant of the medium on the rate of oxidation was observed. The reaction was studied at four different temperatures and observed values of rate constants were utilized to calculate various activation parameters specially the entropy of activation (ΔS #). With the help of the observed kinetic orders with respect to the reactants involved in the reaction, spectrophotometric evidence collected for the formation of reactive complexes and the positive entropy of activation, a most probable reaction mechanism for Pd(II)-catalyzed oxidation of tetracycline hydrate by Cu(Bip)2 2+ in alkaline medium has been proposed.

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Oxidation of allyl alcohol by alkaline periodate in the presence of micro amounts of palladium(II)

Cited by 20 publications

References 9 publications

In Situ Infrared Spectroscopic Monitoring and Characterization of the Growth of Polydopamine (PDA) Films

In Situ Infrared Spectroscopic Monitoring and Characterization of the Growth of Polydopamine (PDA) Films

Elucidating the Structure of Poly(dopamine)

Kinetics of the Oxidation of Tetracycline Hydrate by Copper(II) Complexed with Bipyridyl in Alkaline Medium Using Chloro-Complex of Palladium(II) As Homogeneous Catalyst

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