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

1998 ◽  
Vol 31 (26) ◽  
pp. 9201-9205 ◽  
Author(s):  
Yoshi Okamoto ◽  
T. K. Kwei ◽  
Drahomír Vyprachtický
Keyword(s):  
Aqueous Solution ◽  
Metal Ion ◽  
Ion Binding ◽  
Metal Ion Binding

scholarly journals Metal Ion-Binding Properties of the Diphosphate Ester Analogue, Methylphosphonylphosphate, in Aqueous Solution

1999 ◽  
Vol 6 (6) ◽  
pp. 321-328 ◽  
Author(s):  
Bin Song ◽  
Jing Zhao ◽  
Fridrich Gregáň ◽  
Nadja Prónayová ◽  
S. Ali A. Sajadi ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Metal Ion ◽  
Minor Role ◽  
Ion Binding ◽  
Metal Ion Binding ◽  
Ph Titration ◽  
Role Based ◽  
The Stability ◽  
A Minor ◽  
Complex Stabilities

The stability constants of the 1:1 complexes formed between methylphosphonylphosphate (MePP3-), CH3P(O)2--O-PO32- , and Mg2+, Ca2+, Sr2+, Ba2+, Mn2+, Co2+, Ni2+, Cu2+, Zn2+,​ or Cd2+ (M2+) were determined by potentiometric pH titration in aqueous solution (25 C° ; l = 0.1 M, NaNO3 ). Monoprotonated M(H;MePP) complexes play only a minor role. Based on previously established correlations for M2+ -diphosphate monoester complex-stabilities and diphosphate monoester β-group. basicities, it is shown that the M(Mepp)- complexes for Mg2+ and the ions of the second half of the 3d series, including Zn2+ and Cd2+, are on average by about 0.15 log unit more stable than is expected based on the basicity of the terminal phosphate group in MePP3-. In contrast, Ba(Mepp)- and Sr(Mepp)- are slightly less stable, whereas the stability for Ca(Mepp)- is as expected, based on the mentioned correlation. The indicated increased stabilities are explained by an increased basicity of the phosphonyl group compared to that of a phosphoryl one. For the complexes of the alkaline earth ions, especially for Ba2+, it is suggested that outersphere complexation occurs to some extent. However, overall the M(Mepp)- complexes behave rather as expected for a diphosphate monoester ligand.

Self-assembly with fluorescence readout in a free base dipyrrin–polymer triggered by metal ion binding in aqueous solution

2019 ◽  
Vol 43 (24) ◽  
pp. 9711-9724 ◽  
Author(s):  
Rui Liu ◽  
Pothiappan Vairaprakash ◽  
Jonathan S. Lindsey
Keyword(s):  
Aqueous Solution ◽  
Self Assembly ◽  
Metal Ion ◽  
Zinc Ion ◽  
Ion Binding ◽  
Free Base ◽  
Metal Ion Binding

Profound morphological and fluorogenic changes ensue upon binding of a zinc ion by two polymers, each of which bears a single dipyrrin at one terminus, forming the bis(dipyrrinato)Zn(ii) complex.

Metal ion catalysis of the decomposition of transient 2-carboxy-2,5-cyclohexadienones in aqueous solution

1988 ◽  
Vol 66 (5) ◽  
pp. 1194-1198 ◽  
Author(s):  
Oswald S. Tee ◽  
N. Rani Iyengar
Keyword(s):  
Aqueous Solution ◽  
Carboxylic Acid ◽  
Metal Ion ◽  
Hydrogen Ion ◽  
Ion Binding ◽  
Metal Ion Binding ◽  
Ferric Ions ◽  
Bromide Ion ◽  
Metal Ion Catalysis ◽  
The Stability

Bromide ion induced debromination of the anion of 4-bromo-4-methyl-2,5-cyclohexadienone-2-carboxylic acid (1) is catalyzed by cupric ions and ferric ions. Similarly, the enolization of the anion of the benzocyclohexadienone 3, which is formed during the bromination of 1-naphthol-2-carboxylic acid, is catalyzed by some metal ions. The origin of the catalysis in these reactions is strong metal ion binding to the incipient dianion products that are of the salicylate type. Evidence for this is that the efficiency of the metal (and hydrogen) ion catalysis parallels the stability of the analogous complexes with the salicylate dianion.

Ambivalent metal ion binding properties of cytidine in aqueous solution

1992 ◽  
Vol 31 (26) ◽  
pp. 5588-5596 ◽  
Author(s):  
Yoshiaki Kinjo ◽  
Liangnian Ji ◽  
Nicolas A. Corfu ◽  
Helmut Sigel
Keyword(s):  
Aqueous Solution ◽  
Metal Ion ◽  
Ion Binding ◽  
Metal Ion Binding ◽  
Binding Properties

Metal Ion-Binding Properties in Aqueous Solution of the Nucleoside Analogue, 5,6-Dichloro-1-(β-ᴅ-ribofuranosyl)benzimidazole (DRB)

1998 ◽  
Vol 53 (8) ◽  
pp. 903-908 ◽  
Author(s):  
Larisa E. Kapinos ◽  
Bin Song ◽  
Helmut Sigel
Keyword(s):  
Aqueous Solution ◽  
Metal Ion ◽  
Ion Binding ◽  
Acidity Constant ◽  
Metal Ion Binding ◽  
Binding Properties ◽  
Straight Line ◽  
Data Points ◽  
The Stability ◽  
Straight Lines

Abstract The stability constants of the 1:1 complexes formed between Mg2+, Ca2+, Sr2+, Ba2+, Mn2+, Co2+, Ni2+, Cu2+, Zn2+ or Cd2+ (= M2+) and 5,6-dichloro-l-(β-ᴅ-ribofuranosyl)benzim idazole (DRB) were determined by potentiom etric pH titrations in aqueous solution (25 °C; I = 0.5м, NaNO3). The acidity constant of H(DRB)+, the proton being at N3, was measured by the same method and the result was confirmed via spectrophotometry. Based on previously established [L. E. Kapinos, B. Song, H. Sigel, Inorg. Chim . Acta 280, in press (1998)] logммʟ versus Kʜʜʟ straight-line plots for complexes of imidazole-type ligands it is shown for the Mn(DRB)2+ and Zn (DRB)2+ complexes, as examples, that the benzene ring of the benzim idazole residue exerts a steric inhibition for metal ion binding at N3; i.e., the data points for the M(DRB)2+ complexes fall clearly below the straight lines defined by the imidazole- type ligands.

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