In 2022,Oppermann, Malte; Zinna, Francesco; Lacour, Jerome; Chergui, Majed published an article in Nature Chemistry. The title of the article was 《Chiral control of spin-crossover dynamics in Fe(II) complexes》.Application In Synthesis of 4,4′-Dimethyl-2,2′-bipyridine The author mentioned the following in the article:
Iron-based spin-crossover complexes hold tremendous promise as multifunctional switches in mol. devices. However, real-world technol. applications require the excited high-spin state to be kinetically stable-a feature that has been achieved only at cryogenic temperatures Here the authors demonstrate high-spin-state trapping by controlling the chiral configuration of the prototypical iron(II)tris(4,4′-dimethyl-2,2′-bipyridine) in solution, associated for stereocontrol with the enantiopure Δ- or Λ-enantiomer of tris(3,4,5,6-tetrachlorobenzene-1,2-diolato-κ2O1,O2)phosphorus(V) (P(O2C6Cl4)3- or TRISPHAT) anions. The authors characterized the high-spin-state relaxation using broadband ultrafast CD spectroscopy in the deep UV in combination with transient absorption and anisotropy measurements. The authors find that the high-spin-state decay is accompanied by ultrafast changes of its optical activity, reflecting the coupling to a symmetry-breaking torsional twisting mode, contrary to the commonly assumed picture. The diastereoselective ion pairing suppresses the vibrational population of the identified reaction coordinate, thereby achieving a fourfold increase of the high-spin-state lifetime. More generally, the authors’ results motivate the synthetic control of the torsional modes of iron(II) complexes as a complementary route to manipulate their spin-crossover dynamics. In the experiment, the researchers used many compounds, for example, 4,4′-Dimethyl-2,2′-bipyridine(cas: 1134-35-6Application In Synthesis of 4,4′-Dimethyl-2,2′-bipyridine)
4,4′-Dimethyl-2,2′-bipyridine(cas: 1134-35-6) is used as a chemical Intermediate. It can be used for the determination of ferrous and cyanide compounds.Application In Synthesis of 4,4′-Dimethyl-2,2′-bipyridine Furthermore, 4,4′-Dimethyl-2,2′-bipyridine is used in the synthesis of a series of o-phenanthroline-substituted ruthenium(II) complexes.