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Aqueous solution studies of multidentate ligands with trivalent metal ions

University of British Columbia

Four water-soluble amine phenols have been prepared: tris(((2- hydroxy-5-sulfobenzyl)amino)ethyl)amine (H₆TRNS), 1,1,1-tris(((2-hydroxy-5- sulfobenzyl)amino)methyl)ethane (H₆TAMS), 1,2,3-tris(((2-hydroxy-5- sulfobenzyl)amino)propane (H₆TAPS), cis, cis-1,3,5-tris(((2-hydroxy-5- sulfobenzyl)amino)cyclohexane (H₆TACS). Complex formation constants have been measured at 25 °C (µ = 0.16 M NaCl): log K [M(TRNS)]³⁻ ([M(HTRNS)]²⁻ ) 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)]³⁻ ([M(HTAMS)]²⁻ ) 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)]³⁻ ([M(HTAPS)]²⁻ ) 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 ( ¹H, ¹³C, ¹⁷O, ²⁷A1, ⁷¹Ga, ¹¹⁵In) NMR and UV spectroscopy. A new preparation of N,N'-bis(2-methylpyridyl)ethylenediamine- N,N'-diacetic acid (H₂bped) is reported and some trivalent metal ion complexes have been prepared. Complex formation constants have been measured at 25 °C (µ = 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.

Thesis/Dissertation

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2009-04-17

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http://hdl.handle.net/2429/7300

Chemistry

University of British Columbia

UBCV

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