Poly-4-vinylpyridine derivatives, their physico-chemical properties and the catalytic activity of the pyridine chain units in ester hydrolyses

Starodubtsev, S. G.; Kirsh, Yu. E.; Kabanov, V.Ya.

doi:10.1016/0032-3950(74)90455-9

Cited by 10 publications

(15 citation statements)

References 7 publications

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“…PMVP (alkyl = methyl) was prepared by addition of a 10 wt.-% solution of the PVP sample, P w = 100, in methanol to a 1.5-fold excess of dimethyl sulfate and incubation at room temperature for 10 h. The reaction products were precipitated in dry ether; the quaternization degree (b) of all PAVP samples calculated from IR spectra 15) were more than 90%.…”

Section: Synthesis Of Poly(n-alkyl-4-vinylpyridinium) Cations (Pavp) mentioning

confidence: 99%

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Stability of DNA-containing interpolyelectrolyte complexes in water-salt solutions

Izumrudov¹,

Zhiryakova

1999

Macromol. Chem. Phys.

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SUMMARY: Destruction of interpolyelectrolyte complexes (PEC) formed by DNA and different poly cations was achieved by addition of low molecular weight electrolytes. Monitoring of PEC dissociation was carried out by fluorescence quenching using the ability of the cationic dye ethidium bromide to intercalate into free sites of the DNA double helix accompanied by fluorescence. Degree of polymerization and charge density of the polycations as well as their N-alkyl substituentes (alkyl = methyl, ethyl, and propyl) were shown to be factors influencing the stability of PEC. The ability of added cations and anions to dissociate PEC decreases in the order Cawhich coincides with a decrease of affinity of the same counterions to DNA and to the polycation. The data obtained indicate that the change of the stability of DNA-containing PEC shows the same regularities as revealed for the stability of interpolyelectrolyte complexes formed by oppositely charged flexible synthetic polyelectrolytes in water-salt solutions.

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Section: Synthesis Of Poly(n-alkyl-4-vinylpyridinium) Cations (Pavp) mentioning

confidence: 99%

“…The aliquots were withdrawn every 2 h from the reaction mixture and precipitated in dry ether. In this manner, PEVP-b samples with a constantly increasing b (calculated from IR spectra 15) ) were obtained. Samples of PEVP-b with b = 23 and 46% were used.…”

Section: Synthesis Of Poly(n-alkyl-4-vinylpyridinium) Cations (Pavp) mentioning

confidence: 99%

Stability of DNA-containing interpolyelectrolyte complexes in water-salt solutions

Izumrudov¹,

Zhiryakova

1999

Macromol. Chem. Phys.

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“…[7] Poly(N-alkyl-4-vinylpyridinium) cations (Scheme 1) of PEVP (alkyl = ethyl), PPVP (alkyl = propyl), PBVP (alkyl = Scheme 1. butyl), PHEVP (alkyl = 2-hydroxyethyl), and PHPVP (alkyl = 3-hydroxypropyl) bromides were prepared by addition of a 10 wt.-% solution of the PVP sample, P w = 100, in methanol to a fivefold excess of the corresponding alkyl bromide (ethyl bromide, propyl bromide, butyl bromide, ethylenebromohydrine, and propylenebromohydrine) and heating at 60 8C for 20 h in a hermetically sealed ampoule. The reaction products were precipitated from dry ether; the quaternization degree (b) of all obtained samples determined from IR spectra [8] was more than 92%.…”

Section: Reagentsmentioning

confidence: 99%

“…The degree of alkylation of the obtained PAVP samples can be reliably determined from their IR spectra. [8] In this work, exhaustively alkylated PAVP, i. e. polycations containing more than 92% of alkylated pyridinium groups in the molecules, were studied. Inasmuch as the overwhelming majority of monomer units of the prepared samples carries a positive charge, the charge density of these PAVP samples is close to that of vinylic polyanions.…”

Section: Introductionmentioning

confidence: 99%

Conformation of Polyelectrolyte Chains in Dilute Aqueous Solutions Investigated by Conductometry, 2. Influence of Temperature, Chain Length and N-Alkyl Substituents on the Conformation of Exhaustively Alkylated Poly(N-alkyl-4-vinylpyridinium) Cations

Давыдова

Zelikin

Kargov

et al. 2001

Macromol. Chem. Phys.

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“…Poly(N-ethyl-4-vinylpyridinium) bromide (PEVP bromide) was prepared by incubation of a 10 wt.-% solution of the PVP sample in methanol with a fivefold excess of ethyl bromide at 60 8C during 20 h in a hermetically sealed ampoule. The reaction product was precipitated in dry ether; the degree of quaternization of the sample calculated from IR spectra 13) was more than 0.9 (y a 0.1). All experiments were carried out in 0.01 M Tris buffer solutions, pH 9.5.…”

Section: Methodsmentioning

confidence: 99%

Interpolyelectrolyte reactions in solutions of functionalized dextrans with negatively charged groups along the chains

Izumrudov

Chaubet²,

Clairbois

et al. 1999

Macromol. Chem. Phys.

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SUMMARY: Poly(methacrylate) and functionalized dextrans (obtained by random substitution of soluble dextran with carboxylate, benzylamide, sulfate, and sulfonate groups) were labeled with fluorescent pyrenyl groups. The formation of polyelectrolyte complexes (PEC) of both labeled polyanions with poly(N-ethyl-4-vinylpyridinium) as a quencher, and the competitive reactions in solutions of the PEC were studied by means of the fluorescence quenching technique. A complete excitation of fluorescence was observed when highly sulfated or sulfonated polyanion competitors like heparin and poly(styrenesulfonate) were added to the PEC solutions. We presume that a transfer of the polycation chains from PEC to the polyanion competitors occurs. Modified dextrans are good polyanion competitors due to their content of sulfate and sulfonate groups, even in small amounts. Moreover, the affinity of carboxylate groups containing polyanion competitors to the polycation increases according to the increasing charge density of the chains. Shielding of negative charges of the polyanions by addition of low-molecular weight counterions decreases the efficiency. The data obtained show that both chemical nature of the negatively charged groups and charge density of the polyanion chains are factors that effectively control the equilibrium of competitive interpolyelectrolyte reactions.

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Poly-4-vinylpyridine derivatives, their physico-chemical properties and the catalytic activity of the pyridine chain units in ester hydrolyses

Cited by 10 publications

References 7 publications

Stability of DNA-containing interpolyelectrolyte complexes in water-salt solutions

Stability of DNA-containing interpolyelectrolyte complexes in water-salt solutions

Conformation of Polyelectrolyte Chains in Dilute Aqueous Solutions Investigated by Conductometry, 2. Influence of Temperature, Chain Length and N-Alkyl Substituents on the Conformation of Exhaustively Alkylated Poly(N-alkyl-4-vinylpyridinium) Cations

Interpolyelectrolyte reactions in solutions of functionalized dextrans with negatively charged groups along the chains

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