An Aliphatic Solvent-Soluble Lithium Salt of the Perhalogenated Weakly Coordinating Anion [Al(OC(CCl₃)(CF₃)₂)₄]⁻

The facile synthesis of a new highly aliphatic solvent-soluble Li⁺ salt of the perhalogenated weakly coordinating anion [Al­(OC­(CCl₃)­(CF₃)₂)₄]⁻ and its application in stabilizing the Ph₃C⁺ cation were investigated. The lithium salt Li­[Al­(OC­(CCl₃)­(CF₃)₂)₄] (<b>4</b>) was prepared by the treatment of 4 mol equiv of HOC­(CCl₃)­(CF₃)₂ with purified LiAlH₄ in <i>n</i>-hexane from −20 °C to room temperature. Compound <b>4</b> is highly soluble in both polar and nonpolar solvents, and it bears both CCl₃ and CF₃ groups, resulting in a lower symmetry around the Al center compared to that of Li­[Al­(OC­(CF₃)₃)₄] (<b>1</b>). Treatment of <b>4</b> with Ph₃CCl afforded the ionic compound [Ph₃C]­[Al­(OC­(CCl₃)­(CF₃)₂)₄] (<b>5</b>) bearing the Ph₃C⁺ cation with concomitant elimination of LiCl, suggesting the potential application of [Al­(OC­(CCl₃)­(CF₃)₂)₄]⁻ in stabilizing reactive cationic species. Compounds <b>4</b> and <b>5</b> were fully characterized by spectroscopic and structural methods

Electrochemical Synthesis and Magnetic Properties of [Cu₉W₆]: The Ultimate Member of the Quindecanuclear Octacyanometallate-Based Transition-Metal Cluster?

[Cu₉W₆], synthesized by the electrochemical method, may be the ultimate member of the quindecanuclear octacyanometallate-based transition-metal cluster. Its single-crystal structure and magnetic properties were characterized

Magnetic Bistability in a Discrete Organic Radical

Molecular assembly with magnetic bistability has been of considerable interest for application as electronic devices. In contrast to transition-metal complexes, magnetic bistability so far observed in organic radical crystals is mainly caused by intermolecular electron-exchange interaction. We now report that the magnetic bistability in an organic radical can also be caused by intramolecular electron-exchange interaction. The diradical salt of 1,4-di­(bisphenylamino)-2,3,5,6,-tetramethylbenzene undergoes a phase transition with a thermal hysteresis loop over the temperature range from 118 to 131 K. The phases above and below the loop correspond to two different singlet states of the diradical dication. The results provide a novel organic radical material as an unprecedented instance of an intramolecular magnetic bistability revalent to the design of functional materials

Magnetic Bistability in a Discrete Organic Radical

Molecular assembly with magnetic bistability has been of considerable interest for application as electronic devices. In contrast to transition-metal complexes, magnetic bistability so far observed in organic radical crystals is mainly caused by intermolecular electron-exchange interaction. We now report that the magnetic bistability in an organic radical can also be caused by intramolecular electron-exchange interaction. The diradical salt of 1,4-di­(bisphenylamino)-2,3,5,6,-tetramethylbenzene undergoes a phase transition with a thermal hysteresis loop over the temperature range from 118 to 131 K. The phases above and below the loop correspond to two different singlet states of the diradical dication. The results provide a novel organic radical material as an unprecedented instance of an intramolecular magnetic bistability revalent to the design of functional materials