Preparation and characterization of solid state lanthanum-titanium citrate complexes

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.…”

“…2) and around 3.6 ppm in 1 H-NMR spectra (Fig. 3) are related to the groups of adduct-bonded EG [13,15,16].…”

“…are assigned [13] to OCH 2 and HOCH 2 groups of EG forming an ester with CA. The higher intensity of 3.8 ppm peak, observed in YCit [15] show the presence of doubly esterified EG.…”

“…5 and some quantitative data are summarized in Table 3. The thermal decomposition of the analogous Y-citrate has been studied [13]. Accounting the results on thermochemical behavior of other similar citric complexes (derived on the ground of thermal analysis and identification of a number of intermediates [18][19][20], the following scheme of the decomposition processes of the studied complexes could be proposed.…”

“…Similar complexes, probably with glycolic acid formed in EG-water automotive engine coolants might be of significance for the corrosion of the modern Al-alloys made car engines. The synthetic method described earlier [13] was used: measured amounts of CA was dissolved in EG under stirring at 40…”