Shavaleev, Nail M. published the artcileNear-Infrared Luminescence of Nine-Coordinate Neodymium Complexes with Benzimidazole-Substituted 8-Hydroxyquinolines, Synthetic Route of 457-68-1, the publication is Inorganic Chemistry (2008), 47(19), 9055-9068, database is CAplus and MEDLINE.
A new class of benzimidazole-substituted 8-hydroxyquinoline ligands was prepared that contain a monoanionic tridentate N,N,O-coordinating unit. These ligands, e.g., benzimidazolyl(hydroxy)quinoline I (HL) and methylenebis(hydroxyquinolinylbenzimidazole) II (L2) form charge-neutral lanthanide complexes [Ln(L-R)3]¡¤nH2O or [Ln2(L2)3]¡¤nH2O (n = 1-3) with early lanthanides from LaIII to GdIII inclusive. Crystallog. characterization was carried out for 11 complexes with 6 different ligands. In all of these structures, the lanthanide ion is nine-coordinated by three ligands arranged in an up-up-down fashion around the metal center. The coordination environment can be described as a tricapped trigonal prism, with N atoms of quinoline rings occupying capping positions. Upon deprotonation of the ligand and complex formation, a new absorption band appears in the visible range of the spectrum with a maximum at 466-483 nm and molar absorptivity of (7.2-18) ¡Á 103 M-1 cm-1. Its origin probably is an intraligand phenolate-to-pyridyl charge transfer transition centered on the 8-hydroxyquinolate chromophore. Upon excitation in ligand absorption bands, new NdIII complexes display characteristic metal-centered luminescence in the near-IR region from 850 to 1450 nm with quantum yields and lifetimes in solid state at room temperature ¡Ü0.34% and 1.2 ¦Ìs, resp.
Inorganic Chemistry published new progress about 457-68-1. 457-68-1 belongs to catalysis-chemistry, auxiliary class Fluoride,Benzene, name is Bis(4-fluorophenyl)methane, and the molecular formula is C7H5ClN2S, Synthetic Route of 457-68-1.
Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia