Synthesis and characterization of Tris[(S)-1-dithiocarboxypyrrolidine-2-carboxylato(2 -)-S,S']cobalt(III), a complex derived from the (S)-proline residue

1981 ◽  
Vol 34 (10) ◽  
pp. 2039 ◽  
Author(s):  
T Woon ◽  
MJ O'Conner
Keyword(s):  
Ammonium Salt ◽  
Exchange Resin ◽  
Geometrical Structure ◽  
Complex Anion ◽  
Anion Exchange Resin ◽  
Cobalt Atom ◽  
Protonated Form ◽  
Asymmetric Carbon Atom ◽  
Asymmetric Carbon

The ammonium salt of (S)-1-dithiocarboxypyrrolidine-2-carboxyic acid and its tris-chelated cobalt(III) complex have been prepared and characterized. The ammonium salt of the complex anion is soluble in water whereas the fully protonated form is soluble in some organic solvents. These diamagnetic cobalt(III) compounds and the corresponding neutral methyl ester complex are shown by 13C n.m.r. spectroscopy to have the facial geometrical structure. The complex anion was successfully separated into diastereomeric Δ(SSS) and λ(SSS) forms (S refers to the asymmetric carbon atom in each of the proline moieties) by using Sephadex DEAE anion-exchange resin with aqueous ammonium chloride eluent. The more easily eluted species has the Δ absolute configuration at the dissymmetric cobalt atom as assigned from its circular dichroism spectrum.

Characterization of soil phosphorus by anion exchange resin adsorption and P32-equilibration

1955 ◽  
Vol 6 (4) ◽  
pp. 391-408 ◽  
Author(s):  
F. Amer ◽  
D. R. Bouldin ◽  
C. A. Black ◽  
F. R. Duke
Keyword(s):  
Anion Exchange ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Soil Phosphorus ◽  
Resin Adsorption

Syntheses and Characterization of N-(Indolyl)pyridinium Salts and of Their Ylides

2014 ◽  
Vol 69 (5) ◽  
pp. 605-614 ◽  
Author(s):  
Nazar Pidlypnyi ◽  
Sandra Kaul ◽  
Sebastian Wolf ◽  
Martin H. H. Drafz ◽  
Andreas Schmidt
Keyword(s):  
Anion Exchange ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Pyridinium Salts ◽  
Ring Transformation ◽  
Pyrylium Salts

3-Methylindole reacts with pyridines in the presence of NBS to give indol-2-yl-pyridinium salts which were converted into their ylides by an anion exchange resin in its hydroxide form. Indol-3- amine was subjected to a nucleophilic ring transformation with pyrylium salts which resulted in the formation of indol-3-yl-pyridinium salts, the 2,4,6-trimethylpyridinium derivative of which proved to be unstable. The 2,4,6-triphenylpyridinium derivate was deprotonated to the corresponding ylide. The isomeric indol-2-yl and indol-3-yl derivatives are cycloimmonium ylides which are members of the compound class of heterocyclic mesomeric betaines (MB). By contrast, the ylide of indol- 2-yl-pyrrolidinium is a cycloammonium ylide. It was prepared by reaction of 3-methylindole with pyrrolidine in the presence of NBS, followed by deprotonation.

scholarly journals CHARACTERIZATION AND ADSORPTION CAPACITY OF AMINE-SIO2 MATERIAL FOR NITRATE AND PHOSPHATE REMOVAL

2019 ◽  
Vol 57 (4) ◽  
pp. 492
Author(s):  
Phan Phuoc Toan ◽  
Nguyen Trung Thanh ◽  
Nguyen Nhat Huy ◽  
Le Ngoc Hang ◽  
Le Tri Thich
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Phosphate Removal ◽  
Phosphate Adsorption ◽  
Stable Performance ◽  
Regeneration Times ◽  
Sem Analyses

Amine-SiO2 material was synthesized and applied as a novel adsorbent for nitrate and phosphate removal from aqueous solution. The characterization of Amine-SiO2 were done by using TGA, FTIR, BET, and SEM analyses. Results showed that Amine-SiO2 had higher nitrate and phosphate adsorption capacity of 1.14 and 4.16 times, respectively, than commercial anion exchange resin (Akualite A420). In addition, Amine-SiO2 also had good durability with stable performance after at least 10 regeneration times, indicating that this material is very promising for commercialization in the future as an adsorbent for water treatment.

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