Acid–Base Properties of Xanthosine 5′-Monophosphate (XMP) and of Some Related Nucleobase Derivatives in Aqueous Solution: Micro Acidity Constant Evaluations of the (N1)H versus the (N3)H Deprotonation Ambiguity

2004 ◽  
Vol 10 (20) ◽  
pp. 5129-5137 ◽  
Author(s):  
Salah S. Massoud ◽  
Nicolas A. Corfù ◽  
Rolf Griesser ◽  
Helmut Sigel
Keyword(s):  
Aqueous Solution ◽  
Acidity Constant ◽  
Acid Base ◽  
Base Properties

Toward novel sulphur-containing derivatives of tetraazacyclododecane: synthesis, acid–base properties, spectroscopic characterization, DFT calculations, and cadmium(ii) complex formation in aqueous solution

2020 ◽  
Vol 44 (20) ◽  
pp. 8337-8350 ◽  
Author(s):  
Marianna Tosato ◽  
Marco Verona ◽  
Riccardo Doro ◽  
Marco Dalla Tiezza ◽  
Laura Orian ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Complex Formation ◽  
Dft Calculations ◽  
Spectroscopic Characterization ◽  
Acid Base ◽  
Derivatives Of ◽  
Base Properties

New sulphur derivatives of cyclen, with potential complementary properties with respect to known compounds, have been synthesized and studied.

Acid-Base Properties of Peptide Peroxyl Radicals in Aqueous Solution

1989 ◽  
Vol 6 (2-3) ◽  
pp. 127-128 ◽  
Author(s):  
Oliver J. Mieden ◽  
Man Nien Schuchmann ◽  
Clemens Von Sonntag
Keyword(s):  
Aqueous Solution ◽  
Peroxyl Radicals ◽  
Acid Base ◽  
Base Properties

Synthesis of the tetranitro derivative of thiacalix[4]arene and its acid–base properties

2004 ◽  
Vol 82 (8) ◽  
pp. 1266-1270 ◽  
Author(s):  
Xiaojun Hu ◽  
Zhongliang Zhu ◽  
Tianxiang Shen ◽  
Xianfa Shi ◽  
Jie Ren ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Factor Analysis ◽  
Water Solution ◽  
Uv Spectroscopy ◽  
Nitro Derivative ◽  
Uv Absorption ◽  
Acid Base ◽  
Ph Distribution ◽  
Base Properties

The tetranitro derivative 3 of thiacalix[4]arene was synthesized and characterized. Its acid–base properties in water solution were studied by UV spectroscopy. The four pKa values of 3 were determined by target testing factor analysis (TTFA). The pure UV absorption curves and pH distribution curves of five forms of 3 presented in aqueous solution were also calculated by TTFA.Key words: thiacalixarene, nitro derivative, acid–base properties.

Acid-Base Properties of Adenosine 5′-O-Thiomonophosphate in Aqueous Solution

1997 ◽  
Vol 3 (1) ◽  
pp. 29-33 ◽  
Author(s):  
Bin Song ◽  
Roland K. O. Sigel ◽  
Helmut Sigel
Keyword(s):  
Aqueous Solution ◽  
Acid Base ◽  
Base Properties

Synthesis, Acid-Base Properties, Kinetics and Mechanism of Cu2+ Incorporation into Water-Soluble Highly Substituted Porphyrins

2017 ◽  
Vol 21 (09) ◽  
pp. 611-621
Author(s):  
Hirofumi Konno ◽  
Jun Takeda
Keyword(s):  
Aqueous Solution ◽  
Ionic Strength ◽  
Kinetics And Mechanism ◽  
Water Soluble ◽  
Acid Base ◽  
Base Equilibrium ◽  
Absorbance Change ◽  
Acid Base Equilibrium ◽  
Kinetics Of ◽  
Base Properties

The synthesis, acid-base properties, and kinetics of Cu[Formula: see text] incorporation into water-soluble highly substituted porphyrins were studied. The basicity increased and the stepwise acid-base equilibrium was clarified by increasing the number of phenyl groups at the [Formula: see text] position, and the basicity of a dodeca-substituted porphyrin increased with the ionic strength. The metalation reaction of the dodeca-substituted porphyrin with Cu[Formula: see text] in aqueous solution revealed a biphasic absorbance change at 453 nm. Plots of [Formula: see text] or[Formula: see text] vs. the Cu[Formula: see text] concentration and of log ([Formula: see text] or[Formula: see text]/[Formula: see text] 0) vs. the ionic strength show that [Formula: see text] is dependent on the Cu[Formula: see text] concentration and ionic strength, while [Formula: see text] is independent of these parameters. These results confirm the stepwise metalation mechanism and the existence of an intermediate in aqueous solution, which is indicated by the biphasic absorbance change at 453 nm.

Spectrophotometric and quantum-chemical study of acid-base and complexing properties of (±)-taxifolin in aqueous solution

2017 ◽  
Vol 23 (5) ◽  
Author(s):  
Maxim A. Lutoshkin ◽  
Boris N. Kuznetsov ◽  
Vladimir A. Levdansky
Keyword(s):  
Aqueous Solution ◽  
Quantum Chemical ◽  
Quantum Chemical Study ◽  
Chemical Study ◽  
Acid Base ◽  
Equilibrium Processes ◽  
Complexing Properties ◽  
Aqueous Complexation ◽  
Base Properties

AbstractThis study reports the acid-base properties of taxifolin (Tf) in HCl media and aqueous complexation with Ni(II). The equilibrium processes was investigated using a spectrophotometric technique and

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