A Phosphinine 2-Carboxaldehyde

The first phosphinine 2-carboxaldehyde was synthesized as shown and transformed into an alkene via a Wittig reaction without destruction of the phosphinine ring

Generation and Reactivity of Methylphosphaketene in the Coordination Sphere of Tungsten

The [4 + 2] cycloadduct between the 1-methyl-2-keto-1,2-dihydrophosphinine pentacarbonyltungsten complex and dimethyl acetylenedicarboxylate can be used as a precursor for the methylphosphaketene tungsten complex under UV irradiation at room temperature. Under these conditions, the phosphaketene complex easily loses CO to give the methylphosphinidene complex. Highly reactive alcohols and primary alkylamines trap both the phosphaketene and the phosphinidene complexes. Less reactive phenol and bulky amines together with alkynes and conjugated dienes only trap the phosphinidene complex

A New Route to a 2‑Phosphanaphthalene

The reaction between methylenechlorophosphine-pentacarbonyltungsten and an isobenzofuran affords a [4 + 2] adduct whose oxygen bridge is broken by BBr₃, leading to a 2-phosphanaphthalene

A New Route to a 2‑Phosphanaphthalene

The reaction between methylenechlorophosphine-pentacarbonyltungsten and an isobenzofuran affords a [4 + 2] adduct whose oxygen bridge is broken by BBr₃, leading to a 2-phosphanaphthalene

A New Route to a 2‑Phosphanaphthalene

The reaction between methylenechlorophosphine-pentacarbonyltungsten and an isobenzofuran affords a [4 + 2] adduct whose oxygen bridge is broken by BBr₃, leading to a 2-phosphanaphthalene

A New Route to a 2‑Phosphanaphthalene

The reaction between methylenechlorophosphine-pentacarbonyltungsten and an isobenzofuran affords a [4 + 2] adduct whose oxygen bridge is broken by BBr₃, leading to a 2-phosphanaphthalene

A New Route to a 2‑Phosphanaphthalene

The reaction between methylenechlorophosphine-pentacarbonyltungsten and an isobenzofuran affords a [4 + 2] adduct whose oxygen bridge is broken by BBr₃, leading to a 2-phosphanaphthalene

Morphology-Tuned Phase Transitions of Horseshoe Shaped BaTiO₃ Nanomaterials under High Pressure

Exploring new physical properties of nanomaterials with special morphology have been important topics in nanoscience and nanotechnology. Here we report a morphology-tuned structural phase transition under high pressure in the horseshoe shaped BaTiO₃ nanomaterials with an average diameter of 26 ± 4 nm. A direct structural phase transition from the tetragonal to the cubic phase without local rhombohedral distortion was observed at about 7.7 GPa by in situ high-pressure X-ray diffraction and Raman spectroscopy, which is clearly different from the phase transition processes of the BaTiO₃ bulks and nanoparticles. Additionally, bulk modulus of the tetragonal and cubic phases were determined to be 125.0 and 211.7 GPa, respectively, obviously smaller than the estimated values for BaTiO₃ nanoparticles with the same grain size. Further analysis shows that the unique phase transition process and the enhanced structural stability of the tetragonal horseshoe shaped BaTiO₃ nanomaterials, may be attributed to the similar axes compressibility. Comparing with the high-pressure study on BaTiO₃ nanoparticles, this study suggests that the morphology plays an important role in the pressure-induced phase transition of BaTiO₃ nanomaterials

The Original Coordination Chemistry of 2‑Phosphaphenol with Copper(I) and Gold(I) Halides

2-Phosphaphenol (L) forms unusual complexes with copper and gold halides. With CuCl, a dimeric [L₂CuCl]₂ complex is observed with L acting both as η¹-P terminal and μ₂-P bridging ligand and a copper–copper short contact of 2.549 Å. With copper bromide, a distorted infinite chain [L₂CuBr]_<i>n</i> is formed, whereas with copper iodide, the zigzag chain [L₂CuI]_<i>n</i> is observed. The phosphaphenol acts as a terminal ligand coating the CuX molecular wires. With gold chloride, a dimeric [LAuCl]₂ complex is formed, which is held by an aurophilic interaction at 3.132 Å

The Original Coordination Chemistry of 2‑Phosphaphenol with Copper(I) and Gold(I) Halides

2-Phosphaphenol (L) forms unusual complexes with copper and gold halides. With CuCl, a dimeric [L₂CuCl]₂ complex is observed with L acting both as η¹-P terminal and μ₂-P bridging ligand and a copper–copper short contact of 2.549 Å. With copper bromide, a distorted infinite chain [L₂CuBr]_<i>n</i> is formed, whereas with copper iodide, the zigzag chain [L₂CuI]_<i>n</i> is observed. The phosphaphenol acts as a terminal ligand coating the CuX molecular wires. With gold chloride, a dimeric [LAuCl]₂ complex is formed, which is held by an aurophilic interaction at 3.132 Å