Interaction of poly(2-vinyl pyridine 1-oxide) with mercuric ions

Nasrallah, E. T.

doi:10.1016/0032-3861(79)90021-1

Cited by 3 publications

(6 citation statements)

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“…On the other hand, the concentration profile of the reduced viscosity for P2VPNO was similar to that of a nonionic polymer (Figure ). This tendency was also observed by Holt and Lindsay 24 and Nasrallah . The N−O group in P2VPNO is close to the polymer backbone, which sterically impedes the formation of the hydrate.…”

Section: Resultssupporting

confidence: 74%

“…Pyridine N -oxide is a good ligand for many metal ions . P2VPNO formed a stable complex with HgCl 2 in aqueous solution, whereas the Ca 2+ cation complexed weakly with P2VPNO . Lanthanide metal ions such as Tb 3+ and Eu 3+ exist as stable trivalent ions and exhibit their characteristic fluorescence in aqueous solution, which is known to be strongly influenced by their immediate coordinated environment .…”

Section: Resultsmentioning

confidence: 99%

“…14 P2VPNO formed a stable complex with HgCl 2 in aqueous solution, whereas the Ca 2+ cation complexed weakly with P2VPNO. 15 Lanthanide metal ions such as Tb 3+ and Eu 3+ exist as stable trivalent ions and exhibit their characteristic fluorescence in aqueous solution, which is known to be strongly influenced by their immediate coordinated environment. 16 The fluorescence intensity of the ions is normally quite weak in aqueous solution since the coordinated water molecules serve as efficient quenchers of the emission.…”

Section: Resultsmentioning

confidence: 99%

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Fluorescence, Metal Ion Binding, and Viscosity Properties of Poly[2- and 4-vinylpyridine N-oxide]s in Aqueous Solution

1998

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Poly(2-vinylpyridine N-oxide) (P2VPNO) and poly(4-vinylpyridine N-oxide) (P4VPNO) were synthesized by the oxidation of the corresponding poly(vinylpyridine)s. They are soluble in water and have a characteristic fluorescence in aqueous solutions. The fluorescence intensities of P2VPNO were over 3 times that of P4VPNO in 10-2 M aqueous solutions at ambient temperature, which was accounted for by the difference in the microenvironment of the pyridine N-oxide fluorophore. The N-oxide polymers formed strong complexes with Tb3+ in aqueous solution, and the fluorescence intensities of Tb3+ were greatly enhanced upon complex formation. The increase in fluorescence intensity is due both to the replacement of inner-coordinated water molecules of Tb3+ by N-oxide polymers and to a ligand-to-metal energy transfer. P4VPNO is a better complexing agent for Tb3+ than P2VPNO. The reduced viscosity of P4VPNO increased sharply at polymer concentrations smaller than 1.0 g/dL, as in polyelectrolytes. However, in the case of P2VPNO, the concentration dependence of the reduced viscosity was similar to that of nonionic polymers. These differences are due to the position of the N−O group. P2VPNO and P4VPNO have a charge separation across the N+−O- bond with a large dipole moment. P4VPNO forms a partial complex with water which transforms the N−O group into a weak acid. The complex then behaves like a polyelectrolyte, and upon dilution, the reduced viscosity increases due to chain expansion. In the case of P2VPNO, the N−O group is close to the polymer backbone, which sterically decreases the formation of the water complex, and its reduced viscosity then behaves like that of nonionic polymers. Although P2VPNO does not behave like a polyelectrolyte, addition of Tb3+ reduces the solution viscosity due to a complexation of Tb3+ with the ligands.

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Section: Resultssupporting

confidence: 74%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Fluorescence, Metal Ion Binding, and Viscosity Properties of Poly[2- and 4-vinylpyridine N-oxide]s in Aqueous Solution

1998

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“…Nasrallah estudió la interacción de poli(2-vinilpiridina 1-óxido) con el Hg(II) (32) Se empleo una solución de Cr(Cl) 3 , a la cual se le agregó el polímero zwitteriónico ZW VIII ( lote único) que fue sintetizado y purificado pasándolo sólo una vez por resina.…”

Section: Porcentaje De Turbidez Removida Por Polímeros Iónicosunclassified

“…Además demostró que aumenta la conductividad del polímero y la dependencia de la viscosidad del polímero en función de la concentración de un polielectrolito externo y de la temperatura. 32 Luneau et al usaron una familia de quelatos estables, de tipo bipiridina y fenantrolina Nóxido N-oxil biradicales, para unirlos al cobre(II) y níquel (II), formando complejos estables, los cuales presentan fuerte antiferromagnetismo a bajas temperaturas. 33 Mizutani et.…”

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