An Electron Paramagnetic Resonance and Spectrophotometric Study of Titanium(III)-Chelate Compounds with Nitrilotricarboxylic Acid and Its Derivatives

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Abstract
Complexes formed by titanium(III) and agents which are similar in structure but varying in numbers of carboxyl groups have been studied by EPR and spectrophotometry. Among the reagents investigated, NTA, which posesses four coordinating groups, gives the largest EPR signals with a well-developed hyperfine structure. BHEG, which possesses two coordinating groups, gives much smaller signals, and even at the highest sensitivity setting of the instrument, no definite hyperfine structure can be detected. HEID, which posesses three coordinating groups, gives signals with two peaks, which indicates the simultaneous existance of two complexes in the solution. The ratios of the complexes of titanium(III) and NTA and HEID which exist in solution at various pH values have been spectrophotometrically determined.

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