Optically active Pt-terpyridyl coordination assemblies derived from planar chiral metallothioligands

New Optically Active Bis-Heterocycles Derived from (S)-Proline

Enantiomerically pure bis-heterocycles containing a (S)-proline moiety have been prepared starting from (S)-N-benzylprolinehydrazide (2b). The reactions with isothiocyanates or butyl isocyanate in refluxing MeOH led to the corresponding thiosemicarbazide 5 and semicarbazide 9 with a N-benzylprolinoyl residue. The structure of the tert-butyl derivative 5d was established by X-ray crystallography...

Optically Active Coordination Compounds. Part 50.' 4-Fold Symmetry Axes in Optically Active Complex Ions from Natural Nicotine

Optically active metasurface with non-chiral plasmonic nanoantennas.

We design, fabricate, and experimentally demonstrate an optically active metasurface of λ/50 thickness that rotates linearly polarized light by 45° over a broadband wavelength range in the near IR region. The rotation is achieved through the use of a planar array of plasmonic nanoantennas, which generates a fixed phase-shift between the left circular polarized and right circular polarized compo...

Ion-based assemblies of planar anion complexes and cationic Pt(II) complexes.

Because the metallophilicity of attractive Pt(II)···Pt(II) interactions helps in the fabrication of columnar structures, terpyridine-Pt(II) complexes were used as planar counter cationic species for formation of charge-segregated assemblies using π-conjugated receptor-Cl(-) complexes as planar anions.

Xanthine Dehydrogenase Active Site: Chiral Switching and Substrate Coordination

Analysis of electronic, structural and mechanistic parameters of the enzyme-substrate reaction of xanthine oxidase, a member of the xanthine dehydrogenase class of mono-molybdopterin oxidoreductive enzymes, shows that the molybdenum center in the enzyme active site acts as a reversible chiral switch. The metal center cycles from the (S)-absolute configuration, SPY-5-42-A, in the fully oxidized ...