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Aqueous solution studies of multidentate ligands with trivalent metal ions
| Content Provider | Semantic Scholar |
|---|---|
| Author | Caravan, Peter |
| Copyright Year | 1996 |
| Abstract | Four water-soluble amine phenols have been prepared: tris(((2hydroxy-5-sulfobenzyl)amino)ethyl)amine (H6TRNS), l,l,l-tris(((2-hydroxy-5sulfobenzyl)amino)methyl)ethane (H^TAMS), l,2,3-tris(((2-hydroxy-5sulfobenzyl)amino)propane (H6TAPS), cis, ds-l,3,5-tris(((2-hydroxy-5sulfobenzyl)amino)cyclohexane (HgTACS). Complex formation constants have been measured at 25 °C (\i = 0.16 M NaCl): log K [M(TRNS)]' ([M(HTRNS)]") Ga 28.55 (36.90), In 29.3 (34.9); log K [M(H3TRNS)] ([M(H3TRNS)2]3") La 5.65, Nd 6.41 (6.34), Gd 6.67 (7.69), Ho 7.67 ( 8.75), Yb 8.53 (9.73); log K [M(TAMS)]" ([M(HTAMS)]') Al 22.5 (29.3), Ga 31.83, In 28!49, La 9.17, Nd 11.19, Gd 11.86 (18.41), Ho 12.71 (19.40), Yb 13.78 (20.11); log K [M(TAPS)]([M(HTAPS)]") Al 22.8 (29.0), Ga 31.54 (35.15), In 27.56 (31.93), La 11.33 (18.47), Nd 13.59 (20.13), Gd 14.50 (20.88), Ho 14.71 (21.15), Yb 15.15 (21.54). The complexes were characterized in situ by multinuclear ( 1 H, 1 3 C , 1 7 0 , 2 7 A1, 7 1 G a , 1 1 In) NMR and UV spectroscopy. A new preparation of N,N'-bis(2-methylpyridyl)ethylenediamineN,N'-diacetic acid (H2bped) is reported and some trivalent metal ion complexes have been prepared. Complex formation constants have been measured at 25 °C (\i = 0.16 M NaCl): log K [M(bped)] ([M(bped)(OH)]) Al 10.85 (6.37), Ga 19.89 (15.62), In 22.6 (15.44), La 10.81 (10.75), Nd 11.99 (10.45), Gd 12.37 (10.25), Ho 12.31 (9.31), Yb 13.42 (8.98). The complexes have been characterized in the solid state as PF6" or C104" salts by IR, +LSIMS, elemental analysis, and by X-ray crystallography (Co[bped]PF6); and in solution by multinuclear NMR and UV spectroscopy. |
| File Format | PDF HTM / HTML |
| DOI | 10.14288/1.0059510 |
| Alternate Webpage(s) | https://open.library.ubc.ca/media/download/pdf/831/1.0059510/1 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
