Titanium

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T³⁺ EPR

Ti³⁺ has electronic configuration 3d¹, electron spin 1/2.

A spectrum assigned to Ti/histidine/EDTA complex[1] was observed in the context of a study on transient hydroxy-histidine radical formed by reaction of histidine with hydroxyl radicals generated in a Fenton system. g_iso = 1.9632 (1.9925,1.9573 1.9450, measured separately at 77K) , line width = 0.5 mT, concentration = 14 mM in water, T=power = 1 mW, modulation = 0.05 mT, sweep time = 41 s, time constant = 41 ms. Other species with assigned EPR parameters in this paper are: Ti(III)/EDTA (g=1.9539 stable at pH>7), Ti(IV)-superoxyl (g=2.0117)

Tisaminopyridinato Ti³⁺ - g₀ = 1.936±0.003, line width 3 mT, frequency 9.5 GHz, T=295K, concentration = 66 mM in hexane[2]. At 100 K line is about twice broader. Hyperfine splitting on ^47,49Ti was not observed, due to broad line, measurement parameters not listed.

References

1. Lassmann, G and Eriksson, LA and Lendzian, F and Lubitz, W. Structure of a Transient Neutral Histidine Radical in Solution: EPR Continuous-Flow Studies in a Ti3+/EDTA- Fenton System and Density Functional Calculations. J Phys Chem A 104(40):9144--9152, 2000. BibTeX [las2k]

2. Spannenberg, A and Tillack, A and Arndt, P and Kirmse, R and Kempe, R. Homoleptic trisaminopyridinato MIII complexes (M = Ti, V and Cr), synthesis, structure and EPR investigations. Polyhedron 17(5-6):845--850, 1998. BibTeX [span98]

3. Davies, JJ. EPR and ENDOR of titanium-doped fluoride. Journal of Physics C: Solid State Physics 7:599--609, 1974. BibTeX [dav74]