Ionic liquids from the cationic cobalt(III) Schiff base complex, [Co(acacen)L₂][Tf₂N] (acacen = N,N′-bis(acetylacetone)ethylenediamine, Tf₂N = bis(trifluoromethanesulfonyl)amide)

Abstract

bis(acetylacetone)ethylenediamine, Tf 2 N = bis(trifluoromethanesulfonyl)amide) were prepared. 1 is a liquid at room temperature and exhibits a glass transition at −12 °C, whereas 2 is a solid at room temperature with a melting point of 74.6 °C and glass transition temperature of −15 °C upon cooling from the melt. These salts are red-brown diamagnetic materials that are stable against air and water; these properties differ from those of the corresponding iron(III) salt. Desorption of the axial ligands of 1 and 2 occurs at 180 and 207 °C, respectively.

Molecular Precursors for ZnO Nanoparticles: Field-Assisted Synthesis, Electrophoretic Deposition, and Field-Effect Transistor Device Performance

“…Nickel­(II) , and copper­(II) form mononuclear compounds [Ni–L] or [Cu–L], in which the metal atom possesses a square planar coordination. Further molecules or anions can attach to the central atom in mononuclear complexes with iron­(III) or cobalt­(III) and thus lead to higher coordination numbers. In contrast, oligomers were obtained with zinc, whereby dimers (Zn–L) 2 and tetramers (Zn–L) 4 were characterized by the structure determination of single crystals.…”

Thermal properties and crystal structures of cobalt(III)–cyclam complexes with the bis(trifluoromethanesulfonyl)amide anion (cyclam = 1,4,8,11-tetraazacyclotetradecane)

“…The melting points of these salts generally decrease upon using the [Tf 2 N] À anion and upon introducing alkyl substituents to the cation. Indeed, these modifications of Schiff base complexes [24] produced ionic liquids [22,25]. There is also interest in the thermal properties of [Tf 2 N] salts with chelate complexes [26].…”

Ionic liquids for addressing unmet needs in healthcare

“…Early advances were motivated to develop ILs as green, nonvolatile, nonflammable, and stable solvents, however, recent findings have broadened the field, redefining ILs as low melting salts (melting point <100°C) with an unlimited suite of tunable properties including toxicity, volatility, flammability, and instability . The erstwhile narrow perspective that views ILs as salts of quaternary ammonium, imidazolium, pyrrolidinium, pyridinium, or phosphonium cations has broadened as new cations including the bioinspired cholinium and guanidinium cations as well as metal‐containing cations are paired with various anions to afford salts that meet the definition of IL (Figure ). The evolving complexity of the precursors fosters a conjecture that explains their characteristically low melting point by the structural heterogeneity of a sterically hindered asymmetric cation that impedes strong ionic interaction with the anion as well as precludes ordered packing within a crystal lattice.…”

“…Incorporating a metal center into an organic molecule integrates the unique magnetic, photo‐activity, and redox‐activity of metals with the inherent stability and processibility of organic molecules . Toward this direction, metal‐containing ILs are emerging as counterparts of purely organic‐based ILs with the intent of imparting new functions to liquid salts . This development challenges the concept of ILs as organics salts as the realm opens to organometallic and coordination chemistry.…”