13C-NMR relaxation studies of alkali metal cryptate complexes
β Scribed by H. Dupont Durst; Luis Echegoyen; George W. Gokel; Angel Kaifer
- Publisher
- Elsevier Science
- Year
- 1982
- Tongue
- French
- Weight
- 215 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0040-4039
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β¦ Synopsis
relaxation times (1 Is) of cryptands [2.1.1], [2.2.1] and [2.2.2] as well as those of the corresponding crypeate complexes with Li+, Na+, and K+ in CDCl and CH OH:D 0 (9O:lO) were measured and the results are interpreted in terms of molesular co oreszion % and desolvation effects.
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## Abstract The aromatic ^1^Hβ and ^13^CβNMR. spectra of some metal complexes of o, oβ²βdihydroxyazobenzenes are shown to be useful in distinguishing the two possible isomers (acolar and discolar) stemming from the non equivalence of the two ligating azo nitrogen atoms. The ortho aromatic carbon ato
The 13C NMR characteristics of the polyaminocarboxylate ligands EDTA ~(H0,CCH2)2NCHzCHzN(CH,C0,H),I, DTPA [(H02CCH,)zNCH2CH,N(CHzCOzH)CH,CH2N(CHzN(CHzCOzH)z and NTA [N(CH,C0,H)3] and their Tl(II1) complexes are reported. The pH dependence of the 13C shifts of the ligands is helpful in understanding