Hu, Aohan published the artcileMacrocyclic Ligands with an Unprecedented Size-Selectivity Pattern for the Lanthanide Ions, COA of Formula: C26H36N4O8, the publication is Journal of the American Chemical Society (2020), 142(31), 13500-13506, database is CAplus and MEDLINE.
Lanthanides (Ln3+) are critical materials used for many important applications, often as coordination compounds Tuning the thermodn. stability of these compounds is a general concern, which is not readily achieved due to the similar coordination chem. of lanthanides. Herein, the authors report two 18-membered macrocyclic ligands called macrodipa and macrotripa that show for the first time a dual selectivity toward both the light, large Ln3+ ions and the heavy, small Ln3+ ions, as determined by potentiometric titrations The lanthanide complexes of these ligands were investigated by NMR spectroscopy and x-ray crystallog., which revealed the occurrence of a significant conformational toggle between a 10-coordinate Conformation A and an 8-coordinate Conformation B that accommodates Ln3+ ions of different sizes. The origin of this selectivity pattern was further supported by d. functional theory (DFT) calculations, which show the complementary effects of ligand strain energy and metal-ligand binding energy that contribute to this conformational switch. This work demonstrates how novel ligand design strategies can be applied to tune the selectivity pattern for the Ln3+ ions.
Journal of the American Chemical Society published new progress about 1128304-86-8. 1128304-86-8 belongs to pyridine-derivatives, auxiliary class Pyridines, name is 6,6′-((1,4,10,13-Tetraoxa-7,16-diazacyclooctadecane-7,16-diyl)bis(methylene))dipicolinic acid, and the molecular formula is C26H36N4O8, COA of Formula: C26H36N4O8.
Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem