Electrochemistry of inclusion complexes of organometallics

Strelets, V. V.; Mamedjarova, I.A.; Nefedova, M. N.; Pysnograeva, N.I.; Соколов, В. И.; Pospı́šil, Lubomı́r; Hanzlík, Josef

doi:10.1016/0022-0728(91)85261-m

Cited by 45 publications

(25 citation statements)

References 15 publications

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“…This electrochemical approach is used frequently to study the formation of an inclusion complex [14][15][16][17][18]. For example, Strelets et al [19] have studied the formation of an inclusion complex between ferrocene and ␤-CD using cyclic voltammetry by monitoring the oxidation of ferrocene in the absence and presence of the neutral ␤-CD. They explained the positive shift in the oxidation potential and the reduction in the peak oxidation current for ferrocene, which was observed in the presence of the ␤-CD, to the formation of an inclusion complex.…”

Section: Introductionmentioning

confidence: 99%

An electrochemical study in aqueous solutions on the binding of dopamine to a sulfonated cyclodextrin host

Hendy

Breslin

2012

Electrochimica Acta

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a b s t r a c tClear evidence for the formation of a weak inclusion complex between dopamine (DA) and a sulfonated ␤-CD host in aqueous solution was obtained using a combination of electrochemical approaches. Using cyclic voltammetry, a distinct increase in the oxidation potential of DA and a reduction in the peak oxidation current were observed on adding an excess concentration of the sulfonated ␤-CD to the electrolyte solution. Equally, a clear increase in the half-wave oxidation potential of DA was observed in the presence of the sulfonated ␤-CD using rotating disc voltammetry. The association constant, K, was computed as 331.3 ± 5.8, indicating the formation of a weak inclusion complex, while a 1:1 stoichiometry for the inclusion complex was deduced from a Job's plot analysis. The rate constant for the oxidation of DA was found to decrease on formation of the inclusion complex. This was attributed to higher reorganization energy for the oxidation of the included DA. These changes in the electrochemistry of DA were not observed when an excess of the smaller sulfonated ␣-CD was added to the electrolyte, indicating that these variations are not connected with simple electrostatic interactions between the protonated DA and the anionic sulfonated groups. It is proposed that the aromatic ring of the DA molecule includes within the cyclodextrin cavity, while the protonated amine group remains outside the cavity, bound electrostatically with the anionic sulfonated groups.

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Section: Introductionmentioning

confidence: 99%

An electrochemical study in aqueous solutions on the binding of dopamine to a sulfonated cyclodextrin host

Hendy

Breslin

2012

Electrochimica Acta

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“…However, the problem arises when one wants to carry out the FceCD measurements in the mixed and polar solvents [7]. As stated before not all cyclodextrins are sufficiently soluble in water and dimethyl sulfoxide but ferrocene is poorly soluble in the solutions with high content of water (polar solvent/mixture, in general).…”

Section: Resultsmentioning

confidence: 99%

“…1), Heptakis(2,6-di-Omethyl)-b-cyclodextrin (2-b-CD) and Heptakis(2,3,6-tri-O-methyl)-b-cyclodextrin in the solutions of different ratio of dimethyl sulfoxide (DMSO) and deionized water. Because some studies were not successful in the determination of the complex formation constant of Fc in CDs utilizing solid form complex preparation [7] we decided to use direct solubilization of both Fc and CDs in the DMSO:water mixture. This mixture plays an important role in industry, pharmacology and molecular electronics [20].…”

Section: Introductionmentioning

confidence: 99%

“…The driving forces for the inclusion complexation of CD with guest molecules are mainly hydrophobic interactions, electronic effects, van der Waals forces, steric factors [6]. The interest in the properties of the inclusion complexes comes out from the fact that the specificity of important reactions is based on the ability of CDs to recognize groups which could participate exclusively in a given reaction [7].…”

Section: Introductionmentioning

confidence: 99%

“…Electrochemical techniques, such as cyclic voltammetry have been also utilized for the studies of the FceCD interactions [7,14,15].…”

Section: Introductionmentioning

confidence: 99%

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Correlation of the formation constant of ferrocene–cyclodextrin complexes with dielectric properties of the aqueous DMSO solution

Kolivoška

Gál

Hromadová

et al. 2011

Journal of Organometallic Chemistry

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Molecular Recognition and Host–Guest Interactions

Haiduc

Edelmann

1999

Supramolecular Organometallic Chemistry

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Macrocyclic organomercury compounds have been known for some time, but their ability to bind anionic guests in their cavity was demonstrated relatively recently. This molecular recognition process is somewhat similar to the formation of the crown ether complexes, except that the binding sites of the macrocycle are occupied by metal atoms, able to function as Lewis acids, and therefore to bind halogen and other Lewis base anions. This approach is only in its beginnings and the recent discovery of mercuracarbaboranes as anion binding cyclic receptors gave a new impetus to research in the field.One of the earliest known organomercury macrocycles was the trimer of ovthophenylene mercury, (o-CgH4Hg)3, known from X-ray diffraction studies to have a planar cyclic structure, 1 [I, 21. It has recently been found, with the aid of 199Hg NMR spectroscopy, that this compound forms complexes with halide anions (Cl-, Br-and I-) in dichloromethane solution, but the complexes could not be isolated in solid state [3]. The fluorinated analog (o-CgF4Hg)3, 2, is a much better electron acceptor and forms stable complexes with the same halide anions; these could be 1 2 2.

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Electrochemistry of inclusion complexes of organometallics

Cited by 45 publications

References 15 publications

An electrochemical study in aqueous solutions on the binding of dopamine to a sulfonated cyclodextrin host

An electrochemical study in aqueous solutions on the binding of dopamine to a sulfonated cyclodextrin host

Correlation of the formation constant of ferrocene–cyclodextrin complexes with dielectric properties of the aqueous DMSO solution

Molecular Recognition and Host–Guest Interactions

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