Preparation and Characterization of Yttrium-Titanium Citrate Complexes

Abstract

Yttrium, titanium, and yttrium‐titanium citrate complexes are synthesized in ethylene glycol medium at conditions similar to those used when the polymerized complex method (a version of the sol‐gel technology) is applied. The composition and IR, 1H and 13C NMR spectral characteristics of the isolated solid state complexes are studied. Proofs of the mixed metal nature of the bimetallic complexes are reported. The conditions of deprotonation of the alcoholic OH group of the citrate ligands are considered.

Synthesis and characterization of Mn-, La-Mn- and La-Ca-Mn-citrates as precursors for LaMnO3 and La1−xCaxMnO3

“…For such type systems 1 H-NMR-spectroscopy proved to be rather useful for a quantitative determination of the esterification degree of the ligands and the relative mole content of adduct-bonded EG [24].…”

“…X-ray diffractogram shows that the sample obtained after desalting of the suspension is not phase homogeneous. Along with the X-ray amorphous phase, typical for many of the citric complexes prepared in similar way [22,24,25], a crystalline phase is also seen. Its identification is impeded due to the intensive halo hiding the eventual reflexes at lower 2Θ values.…”

“…The complexation is proven by the band at ∼1610-1600 cm On the basis of the IR-data, the data on the elemental composition and the data from the thermogravimertric analysis of the complexes as well as the results obtained for similar complexes isolated from Pechini-type systems containing more than one metal [21][22][23][24][25][26]28], hypothetic formulae of the complexes synthesized using MnCl 2 as source metal salt may be proposed:…”

“…• C is observed for number of analogous citric complexes [22][23][24][25][26]. Heating Mn(N)Cit-120 and Mn(N)Cit-80 for 2 h at 1000…”

Synthesis and characterization of Al-and Y-Al-citrates as potential precursors for YAlO3

“…1-3. Their interpretation is based on the data reported in [13][14][15][16]. The intensity ratios of the proton signals of the CH 2 groups in the EG and in the CA in the 1 H -NMR spectra of the samples permit the determination of the degree of the ligand esterification and of the content of the adduct-bonded EG.…”