pH-controlled inclusion and release of oxyanions by dendrimers bearing methyl orange moieties

Organic Letters

Volumn 2, Issue 15, 2000, Pages 2343-2346

  Stephan, Holger ^a   Spies, Hartmut ^a   Johannsen, Bernd ^a   Kauffmann, Christopher ^b   Vögtle, Fritz ^b  

^a INSTITUTE OF ION BEAM PHYSICS AND MATERIALS RESEARCH   (Germany)

^b UNIVERSITY OF BONN   (Germany)

Author keywords

[No Author keywords available]

Indexed keywords

AZO COMPOUND; CHLOROFORM; METHYL ORANGE; NUCLEOTIDE; PERTECHNETIC ACID TC 99M; POLYAMINE; SOLVENT;

ARTICLE; CHEMISTRY; METABOLISM; PH;

AZO COMPOUNDS; CHLOROFORM; HYDROGEN-ION CONCENTRATION; NUCLEOTIDES; POLYAMINES; SODIUM PERTECHNETATE TC 99M; SOLVENTS;

EID: 0034720916     PISSN: 15237060     EISSN: None     Source Type: Journal    
DOI: 10.1021/ol006100r     Document Type: Article

References (23)

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8. 3 NaOAc/HCl (pH 2.0-5.2), 2-[N-morpholino]-ethanesultbnic acid (MES)/NaOH (5.4-6.5), and N-[2-hydroxyethyl]-piperazine-N′-[2-ethanesulfonic acid] (HEPES)/NaOH buffer (7.0-8.0).
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10. 21
11. 10
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15. The extraction protocol shows no difference for non- and preequilibration.
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17. TcO4 is defined as the quotient of the concentration of pertechnetate in the organic and aqueous phases.
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20. Under the experimental conditions, the chosen low-generation dendrimer 1 (1st generation) is not capable of extracting anions of the type investigated here.
21. In the pH range of 5.4-7.4 the extraction efficacy is mainly dependent on the generation number of POPAM dendrimers. Further investigations with functionalized dendrimers show that functional groups (azobenzene, tert-butylbenzene, dimethoxybenzene, naphthalene, dansyl) grafted at the dendrimer periphery play a less important role.
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