9 research outputs found
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 AcceptorâDonorâAcceptor Triad Covering Entire UVâvis and Near-Infrared Regions
A novel fused acceptorâdonorâacceptor
(AâDâA)
type panchromatically electrochromic compound was synthesized. It
exhibited intensive absorption bands covering entire UVâvis
and near-infrared regions upon reduction to the radical anionic state,
owing to the simultaneous presence of Ï*âÏ* 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>-2âČ-ethynyl-1,10-dioxaÂ[10]-paracyclophane,
were prepared and polymerized under the catalysis of RhÂ(nbd)ÂBPh<sub>4</sub> and MoCl<sub>5</sub>, respectively. The resultant polymers
had high <i>cis</i>-structure contents and took dominant <i>cis</i>â<i>transoid</i> helical conformations
with an excess screw sense as revealed by <sup>1</sup>H 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 cobaltÂ(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
Isolation and phototransformation of enantiomerically pure iridium(III) bis[(4,6-difluorophenyl)pyridinato-N,C-2]picolinate
A Star-Shaped Molecule with Low-Lying Lowest Unoccupied Molecular Orbital Level, nâType 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 â4.10 eV. In
addition, it exhibited panchromatic electrochromism attributed to
the simultaneous presence of Ï*âÏ* 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