Packiaraj, S. published the artcileDifferent coordination geometries of lighter lanthanates driven by the symmetry of guanidines as charge compensators, Synthetic Route of 110-99-6, the main research area is crystal structure guanidinium lanthanide thiodiacetate oxydiacetate preparation luminescence.
Two new related families (GunH)3[Ln(tda)3] I and (AgunH)3[Ln(oda)3]·H2O II (Ln = La, Ce, Pr, Nd and Sm, H2tda = thiodiacetic acid, H2oda = oxydiacetic acid, GunH = guanidinium, AgunH = aminoguanidinium) were successfully synthesized using a controlled process under oil-bath conditions (at 120° for a day) and characterized by various physicochem. techniques. The structures were solved for Pr and Nd in I and for La in II, resp., from x-ray diffraction data of single crystals. The isostructural complexes of (GunH)3[Pr(tda)3] and (GunH)3[Nd(tda)3] crystallize in the hexagonal crystal system with space group P6̅2c, while (AgunH)3[La(oda)3]·H2O has a triclinic symmetry with the P1̅ space group. Generally, coordination number 6 (octahedral) and 4 (tetrahedral) structures are very rare except when bulky ligands are present. Typically, the thiodiacetate (O,S,O) and oxydiacetate (O,O,O) anions act as tridentate ligands to create monomeric structures. Surprisingly, for the 1st time, the thiodiacetate anion takes a somewhat rare bidentate (O,O) mode, leading to trigonal prismatic geometry around the metal ion even for a flexible ligand, whereas the oxydiacetate dianion (oda2-) acquires the usual nine coordinated distorted monocapped square anti-prismatic (MSAP) geometry. The simultaneous TG-DTA I complexes could not be recorded due to spurting, while the type II compounds show smooth and similar thermal behavior on heating. The photoluminescent properties of I and II were studied at room temperature, which indicate that the emissions come from intra-ligand π-π* transitions.
New Journal of Chemistry published new progress about Crystal structure. 110-99-6 belongs to class alcohols-buliding-blocks, name is 2,2′-Oxydiacetic acid, and the molecular formula is C4H6O5, Synthetic Route of 110-99-6.
Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts