Binaphthyl–Bipyridyl Cyclic Dyads as a Chiroptical Switch

A series of chiral cyclic dyads, axially chiral binaphthyls linked to a 3,3′-bipyridyl, was synthesized. The dyad <b>2</b> bearing methoxy groups exhibited ON/OFF properties in circularly polarized luminescence (CPL), yielding a |<i>g</i>_lum| of 1.6 × 10^–3 or 0 without any change in fluorescence. This type of CPL switch is unprecedented. Regioisomer <b>4</b> exhibited a <i>dextro</i>/<i>levo</i> rotation switching ability in [α]_D. X-ray structures as well as experimental and theoretical analyses suggested that the switching properties depended on conformational changes

Binaphthyl–Bipyridyl Cyclic Dyads as a Chiroptical Switch

A series of chiral cyclic dyads, axially chiral binaphthyls linked to a 3,3′-bipyridyl, was synthesized. The dyad <b>2</b> bearing methoxy groups exhibited ON/OFF properties in circularly polarized luminescence (CPL), yielding a |<i>g</i>_lum| of 1.6 × 10^–3 or 0 without any change in fluorescence. This type of CPL switch is unprecedented. Regioisomer <b>4</b> exhibited a <i>dextro</i>/<i>levo</i> rotation switching ability in [α]_D. X-ray structures as well as experimental and theoretical analyses suggested that the switching properties depended on conformational changes

Binaphthyl–Bipyridyl Cyclic Dyads as a Chiroptical Switch

A series of chiral cyclic dyads, axially chiral binaphthyls linked to a 3,3′-bipyridyl, was synthesized. The dyad <b>2</b> bearing methoxy groups exhibited ON/OFF properties in circularly polarized luminescence (CPL), yielding a |<i>g</i>_lum| of 1.6 × 10^–3 or 0 without any change in fluorescence. This type of CPL switch is unprecedented. Regioisomer <b>4</b> exhibited a <i>dextro</i>/<i>levo</i> rotation switching ability in [α]_D. X-ray structures as well as experimental and theoretical analyses suggested that the switching properties depended on conformational changes

Binaphthyl–Bipyridyl Cyclic Dyads as a Chiroptical Switch

A series of chiral cyclic dyads, axially chiral binaphthyls linked to a 3,3′-bipyridyl, was synthesized. The dyad <b>2</b> bearing methoxy groups exhibited ON/OFF properties in circularly polarized luminescence (CPL), yielding a |<i>g</i>_lum| of 1.6 × 10^–3 or 0 without any change in fluorescence. This type of CPL switch is unprecedented. Regioisomer <b>4</b> exhibited a <i>dextro</i>/<i>levo</i> rotation switching ability in [α]_D. X-ray structures as well as experimental and theoretical analyses suggested that the switching properties depended on conformational changes

Binaphthyl–Bipyridyl Cyclic Dyads as a Chiroptical Switch

A series of chiral cyclic dyads, axially chiral binaphthyls linked to a 3,3′-bipyridyl, was synthesized. The dyad <b>2</b> bearing methoxy groups exhibited ON/OFF properties in circularly polarized luminescence (CPL), yielding a |<i>g</i>_lum| of 1.6 × 10^–3 or 0 without any change in fluorescence. This type of CPL switch is unprecedented. Regioisomer <b>4</b> exhibited a <i>dextro</i>/<i>levo</i> rotation switching ability in [α]_D. X-ray structures as well as experimental and theoretical analyses suggested that the switching properties depended on conformational changes

Binaphthyl–Bipyridyl Cyclic Dyads as a Chiroptical Switch

A series of chiral cyclic dyads, axially chiral binaphthyls linked to a 3,3′-bipyridyl, was synthesized. The dyad <b>2</b> bearing methoxy groups exhibited ON/OFF properties in circularly polarized luminescence (CPL), yielding a |<i>g</i>_lum| of 1.6 × 10^–3 or 0 without any change in fluorescence. This type of CPL switch is unprecedented. Regioisomer <b>4</b> exhibited a <i>dextro</i>/<i>levo</i> rotation switching ability in [α]_D. X-ray structures as well as experimental and theoretical analyses suggested that the switching properties depended on conformational changes

Carbazole-Based Boron Dipyrromethenes (BODIPYs): Facile Synthesis, Structures, and Fine-Tunable Optical Properties

Carbazole-based BODIPYs were synthesized in three steps using an organometallic approach consisting of sequential Ir-catalyzed borylation, Suzuki–Miyaura coupling, and boron complexation. Various substituents were introduced into the carbazole moiety, and large substituent effects were confirmed by means of absorption spectroscopy, cyclic voltammetry, and DFT calculations. Dibenzocarbazoles were also converted into the corresponding BODIPYs

Intramolecular Electronic Coupling in the Thiophene-Bridged Carbazole-Based Diporphyrin

The Glaser coupling reaction of ethynyl-substituted carbazole-based isophlorins provided butadiyne-bridged dimers, which were transformed into the thiophene-bridged dimers via the annulation reaction. Oxidation of these isophlorin dimers afforded carbazole-based diporphyrins. Notable electronic interactions in the diporphyrins have been confirmed by means of UV/vis–near-infrared (NIR) absorption spectroscopy, cyclic voltammetry (CV) measurements, and density functional theory (DFT) calculations

Solvent-Free Benzoin and Stetter Reactions with a Small Amount of NHC Catalyst in the Liquid or Semisolid State

The intermolecular or intramolecular asymmetric benzoin reaction was catalyzed by a small amount of N-heterocyclic carbene (NHC) (0.2–1 mol %) under solvent-free conditions. The solvent-free intramolecular asymmetric Stetter reaction also proceeded efficiently with NHC (0.2–1 mol %). In some cases, even solid-to-solid or solid-to-liquid conversions took place with low catalyst loading (0.2–1 mol %)

Correction to “Bifunctional Porphyrin Catalysts for the Synthesis of Cyclic Carbonates from Epoxides and CO₂: Structural Optimization and Mechanistic Study”

Correction to “Bifunctional Porphyrin Catalysts for the Synthesis of Cyclic Carbonates from Epoxides and CO₂: Structural Optimization and Mechanistic Study