Isolation and phototransformation of enantiomerically pure iridium(iii) bis[(4,6-difluorophenyl)pyridinato-N,C2]picolinate

Here we report the resolution of phosphorescent light-emitting iridium(III) bis[(4,6-difluorophenyl)pyridinato-N,C2]-picolinate into its respective enantiomers by using chiral HPLC and the photo-induced transformation of the isolated enantiomers

Isolation and phototransformation of enantiomerically pure iridium(III) bis[(4,6-difluorophenyl)pyridinato-N,C-2]picolinate

Here we report the resolution of phosphorescent light-emitting iridium(III) bis[(4,6-difluorophenyl) pyridinato-N, C-2]-picolinate into its respective enantiomers by using chiral HPLC and the photo-induced transformation of the isolated enantiomers

Electrochromism of a Fused Acceptor–Donor–Acceptor Triad Covering Entire UV–vis and Near-Infrared Regions

A novel fused acceptor–donor–acceptor (A–D–A) type panchromatically electrochromic compound was synthesized. It exhibited intensive absorption bands covering entire UV–vis and near-infrared regions upon reduction to the radical anionic state, owing to the simultaneous presence of π*−π* transitions and intervalence charge transfer

Planar-to-Axial Chirality Transfer in the Polymerization of Phenylacetylenes

A pair of enantiomerically pure planar chiral phenylacetylenes, <i>R</i>- and <i>S</i>-2′-ethynyl-1,10-dioxa­[10]-paracyclophane, were prepared and polymerized under the catalysis of Rh­(nbd)­BPh₄ and MoCl₅, respectively. The resultant polymers had high <i>cis</i>-structure contents and took dominant <i>cis</i>–<i>transoid</i> helical conformations with an excess screw sense as revealed by ¹H NMR, Raman, polarimetry, circular dichroism spectroscopy, and computational simulation, manifesting the effective guidance of the planar chirality of monomers to the growth of the polymer main chains. The rigid <i>ansa</i>-structure of monomer unit made the helical structure of polymer backbone stable toward grinding and thermal treatments. The stereoselective interactions between these chiral polymers and the enantiomers of racemic ethynyl-1,10-dioxa[10]-paracyclophane and cobalt­(III) acetylacetonate were observed. This work demonstrated the first planar-to-axial chirality transfer in the polymerization of acetylenes and offered a new strategy to prepare chiral materials based on optically active helical polymers

Enantiomer-selective magnetization of conglomerates for quantitative chiral separation

Despite significant development in selective crystallization of chiral compounds this method still lacks high efficiency. Here the authors describe an efficient enantiomer-selective magnetization strategy for quantitatively separating the crystals of conglomerates by using magnetic nano-splitters

A Star-Shaped Molecule with Low-Lying Lowest Unoccupied Molecular Orbital Level, n‑Type Panchromatic Electrochromism, and Long-Term Stability

An electron-deficient star-shaped molecule based on anthraquinone imide was synthesized and characterized. It showed high electron accommodating capacity and strong electron-withdrawing ability with a low-lying lowest unoccupied molecular orbital (LUMO) of −4.10 eV. In addition, it exhibited panchromatic electrochromism attributed to the simultaneous presence of π*−π* transitions and intervalence charge transfer (IV-CT) upon one-electron reduction, and revealed long-term stability in electron gain and loss due to the proper LUMO energy level and ordered intermolecular assembly