The crystal structures of the mixed-cation compounds KMg½[Ti(H2cit)3]·6H2O and (NH4)Mg½[Ti(H2cit)3]·6H2O (H4cit = citric acid), which were synthesized by a modified Pechini process, feature three bidentate [(HO2CCH2)2C(CO2–)O–] citrato groups that chelate to the titanium atom through their negatively-charged α-alkoxyl and α-carboxyl oxygen atoms; the other two β-carboxylic acid groups are free.
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Zhou et al. (2003) studied this question.
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