Potentiometric and spectrophotometric studies of the equilibria between silver(I) ion and crown ethers containing chromophore substituents in propylene carbonate

Ossowski, Tadeusz; Kira, Jaromir; Rogowska, Dorota; Warmke, Hanna; Młodzianowski, Janusz

doi:10.1039/a908585h

Cited by 24 publications

(10 citation statements)

References 20 publications

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“…The complexes with mono aza 15C5 crown derivative due to the presence of a nitrogen atom in the ligand molecule show much stronger coordination of silver ions 5.52 in methanol. 44 Furthermore the presence of sandwich complexes was also observed.…”

Section: Resultsmentioning

confidence: 90%

Doubly-bridged PNP-lariat ethers and their complexes with silver(i) ions in methanol solution

et al. 2013

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We report the preparation of four new double-bridged PNP-lariat ether derivatives L1-L4 synthesized from precursor 1 by the subsequent substitution of chlorine atoms. The process consists of two steps. In the first one two reactive chlorine atoms of the -PCl 2 exocyclic moiety are substituted with respective nucleophiles: 2,2 0 -thiodiethanethiol 2 and 2,2 0 -oxydiethanethiol 3. In the second step the other chlorine atoms are substituted by aziridynyl 6 and pyrrolidinyl 7 groups, respectively. Their structures were established by MS, 1 H NMR, 31 P NMR, 13 C NMR spectroscopy. Furthermore, this work includes the investigation of complexation of silver(I) ions with the new ligands L1-L4 in methanol solution. The formation of the novel tetra-nuclear silver(I) complexes were observed. Stability constants were determined using a simple potentiometric titration. 1 H NMR, 31 P NMR, 13 C NMR spectra were recorded to investigate how the complexation of silver(I) ions by the investigated macrocyclic ligands occurs.Scheme 1 Polymacrocyclic structures formed in the reaction of chlorocyclophosphazenes with diamines.

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Section: Resultsmentioning

confidence: 90%

Doubly-bridged PNP-lariat ethers and their complexes with silver(i) ions in methanol solution

et al. 2013

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“…Two of them contain two anthraquinone groups attached to diazacrown ethers of different size. The details of synthesis of the first one, 7,13-bis(9,10-dioxo-1-anthryl)-1,4,10-trioxa-7,13-diazacyclopentadecane, (AQ) A 2 15C5, is given in [16].…”

Section: Preparation Of Athraquinone Derivativesmentioning

confidence: 99%

Supramolecular Derivatives of 9,10‐Anthraquinone. Electrochemistry at Regular‐ and Low Ionic Strength and Complexing Properties

et al. 2003

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Three newly synthesized polyanthraquinone derivatives: 7,13-bis(9,10-dioxo-1-anthryl)-1,4,10-trioxa-7,13-diazacyclopentadecane, (AQ)A 2 15C5, 7,16-bis(9,10-dioxo-1-anthryl)-1,4,10,13-tetraoxa-7,16-diazacyclooctadecane, (AQ)A 2 18C6, and tris[(9,10-diokso-1-antryl)-aminoethyl]amine, (AQNet) 3 N, were examined by cyclic and normal pulse voltammetry. All anthraquinone groups in these compounds were electroactive and formed the radicals and dianions similarly to simple anthraquinone. The differences between the voltammograms obtained in the absence and presence of supporting electrolyte are discussed, and the diffusion coefficients of the compounds and the rates of the chemical reactions following the first reduction step were evaluated. (AQNet) 3 N appears to be a good model compound for multi electron transfers in aprotic solvents. It offers two consecutive nearly reversible 3-electron redox systems: 0/À 3 and À 3/À 6. The interactions of the radicals and dianions of the above compounds with alkali metal cations were examined.

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“…All compounds were synthesized from 1,4-di-p-toluenosufonyloksy-9,10anthraquinone, obtained previously from 1,4-dihydroksy-9,10-anthraqinone [5,6]. The compounds (1), (2), (3) were prepared by the reaction of 1,4-di-p-toluenosufonyloksy-9,10-anthraquinone and excess of 2-(methylamino)ethanol, dimethylamine and diethylamine, in toluene in high temperature, obtaining 65%, 48%, and 72% yields for derivatives (1), (2), (3) respectively.…”

Section: Scheme 1 Synthesis Of 14-anthraquinone Derivativesmentioning

confidence: 99%

Influence of substituent on spectroscopic and acid-base properties of anthraquinone derivatives

Bigot

Niedziałkowski

Czupryniak

et al. 2010

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A series of 1,4-disubstituted aminoanthraquinones has been prepared from 1,4 ditosyloksyanthraquinone. The potentiometric and UV-spectrophotometric method have been used to study the acid-base properties of obtained compounds. The absorption spectra revealed the presence of vibroelectronic band in visible region for compounds containing two tertiary nitrogen groups. It indicates the separation of vibronic states in the molecule. Determined pKa values in acetonitrile used as a solvent indicate the influence of substitution of amino group on basicity of the anthraquinone moiety.

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Potentiometric and spectrophotometric studies of the equilibria between silver(I) ion and crown ethers containing chromophore substituents in propylene carbonate

Cited by 24 publications

References 20 publications

Doubly-bridged PNP-lariat ethers and their complexes with silver(i) ions in methanol solution

Doubly-bridged PNP-lariat ethers and their complexes with silver(i) ions in methanol solution

Supramolecular Derivatives of 9,10‐Anthraquinone. Electrochemistry at Regular‐ and Low Ionic Strength and Complexing Properties

Influence of substituent on spectroscopic and acid-base properties of anthraquinone derivatives

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