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Synthesis and Characterization of Titanium (III) Chloride Complexes with Selected Amino Acids
Gratton, Kevin A.
Gratton, Kevin A.
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Abstract
Some amino acid complexes of titanium (III) chloride have been prepared. The complexes were prepared by refluxing stoichiometric amounts of the amino acid and titanium (III) chloride in benzene for several days. The complexes had empirical formulas TiCl3. 2L (where L can be glycine, dl-alanine, dl-2aminobutyric acid, dl-norvaline, B-alanine, but not dl-aspartic acid or anthranilic acid). Some preliminary work was done on the preparation of a mixed complex of titanium (III) chloride with glycine and pyrudine. Compounds prepared approximated TiCl3. 2Glycine. aPyridine (where a can be 1 or 2).
Data are presented on decomposition temperature, solubility in a variety of solvents, infrared spectra, ultraviolet-visible spectra, and magnetic susceptibility.
The amino acid complexes are light purple in color. The glycine and dl-alanine complexes are powders, while the dl-aminobutyric acid and dl-norvaline complexes are crystalline platelets. The B-alanine complex is a dark purple crystalline substance. The pyridine complex (TiCl3. 2Glycine. Pyridine) is light green. Two forms of TiCl3. 2Glycine. 2Pyridine were prepared. One was dark green; the other, yellow. They were all sensitive to air and moisture, being decomposed within minutes.
The decomposition data show an increase in thermal stability in the case of the L-amino acid ligand complexes when increasing the chain length of the ligand. The B-alanine complex is the least stable.
The complexes of the amino acids are generally insoluble in non-coordinating solvents but are affected in some way (usually dissolving slightly with color change) in coordinating solvents. The glycine-pyridine complexes differ in solubilities in that they are soluble in come non-coordinating solvents.
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Date
1968-10-01
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University of Kansas
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gratton_1968_3512509.pdf
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