Complexes of carbohydrates with metal cations. III. Conformations of alditols in aqueous solution

1974 ◽  
Vol 27 (7) ◽  
pp. 1447 ◽  
Author(s):  
SJ Angyal ◽  
D Greeves ◽  
JA Mills
Keyword(s):  
Aqueous Solution ◽  
Complex Formation ◽  
Metal Ions ◽  
Chloroform Solution ◽  
Metal Cations ◽  
Carbon Carbon Bonds ◽  
Carbon Bonds ◽  
Oxygen Atoms

Complex formation of alditols with metal ions in aqueous solution has been investigated by electrophoresis and by the study of the N.M.R. spectra in the presence of europium ions. Complexing occurs at three consecutive oxygen atoms which are in a gauche-gauche arrangement; the energy required to form this arrangement (by rotation around carbon-carbon bonds) determines the extent of complex formation. It appears that the alditols in aqueous solution are essentially in the same conformations as are their acetates in chloroform solution.

Trimeric uranyl(vi)–citrate forms Na+, Ca2+, and La3+ sandwich complexes in aqueous solution

2020 ◽  
Vol 56 (86) ◽  
pp. 13133-13136
Author(s):  
Jerome Kretzschmar ◽  
Satoru Tsushima ◽  
Björn Drobot ◽  
Robin Steudtner ◽  
Katja Schmeide ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Metal Ions ◽  
Sandwich Complexes ◽  
Oxygen Atoms

Under the uranyl citrate umbrella: metal ions are extremely shielded from water upon coordination by six uranyl(vi) oxygen atoms.

A novel thermodynamic approach for the complexation study of toxic metal cations by a landfill leachate

2018 ◽  
Vol 42 (10) ◽  
pp. 7640-7648 ◽  
Author(s):  
Salvatore Cataldo ◽  
Gabriele Lando ◽  
Demetrio Milea ◽  
Santino Orecchio ◽  
Alberto Pettignano ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Environmental Impact ◽  
Metal Ions ◽  
Landfill Leachate ◽  
Toxic Metal ◽  
Metal Cations ◽  
Thermodynamic Approach ◽  
Toxic Metal Ions ◽  
Solution Behaviour ◽  
Humic Fraction

The leachate humic fraction is a good sequestering agent towards toxic metal ions, influencing their aqueous solution behaviour and their environmental impact.

Selective colorimetric sensing of fluoride in an aqueous solution by amino-naphthoquinone and its Co(ii), Ni(ii), Cu(ii) and Zn(ii) complexes – effect of complex formation on sensing behaviour

RSC Advances ◽  
2016 ◽  
Vol 6 (94) ◽  
pp. 91265-91274 ◽  
Author(s):  
C. Parthiban ◽  
Samuele Ciattini ◽  
Laura Chelazzi ◽  
Kuppanagounder P. Elango
Keyword(s):  
Aqueous Solution ◽  
Complex Formation ◽  
Metal Ions ◽  
Colorimetric Sensing

The complexation of metal ions with amino-naphthoquinone was found to not only enhance the HBD property of the N–H group but also accomodates ≥50% of water in the sensing medium.

Trivalent metal ions promote the malic enzyme-catalyzed building of carbon–carbon bonds from CO2 and pyruvate

2020 ◽  
Vol 44 (40) ◽  
pp. 17208-17214
Author(s):  
Takayuki Katagiri ◽  
Yutaka Amao
Keyword(s):  
Metal Ions ◽  
Malic Enzyme ◽  
Metal Ion ◽  
Trivalent Metal ◽  
Carbon Carbon Bonds ◽  
Carbon Bonds ◽  
Trivalent Metal Ions

ME is an attractive biocatalyst for building carbon–carbon bonds through carboxylation of pyruvate with CO2. The carboxylation of pyruvate with CO2 was promoted by adding a trivalent metal ion. In particular, Al3+ accelerates ME-catalyzed carboxylation of pyruvate with CO2.

Remote Functionalization of Carbon-Hydrogen and Carbon-Carbon Bonds by Bare Transition Metal Ions in the Gas Phase

1989 ◽  
pp. 203-234 ◽  
Author(s):  
Gregor Czekay ◽  
Thomas Drewello ◽  
Karsten Eller ◽  
Carlito B. Lebrilla ◽  
Tilmann Prüsse ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Gas Phase ◽  
Transition Metal Ions ◽  
Carbon Carbon Bonds ◽  
Carbon Bonds
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