Novel pyridinium based cobalt carbonyl ionic liquids: synthesis, full characterization, crystal structure and application in catalysis

Abstract

Through an optimized synthetic strategy, a series of novel alkylpyridinium cobalt tetracarbonyl salts, [C(1)Py][Co(CO)(4)] (), [C(4)Py][Co(CO)(4)] () and [C(16)Py][Co(CO)(4)] () (C(n)Py = N-C(n)H(2n+1)-pyridinium), were successfully prepared in good yields, using a water-organic biphasic system. All the three compounds melt well below 100 degrees C and could be classified as ionic liquids. The compounds were fully characterized using IR, UV-Vis, (1)H NMR, (13)C NMR, ESI-MS and elemental analysis, and was structurally characterized by X-ray single crystal analysis. Compound has been found to be an efficient and reusable catalyst for the alkoxycarbonylation of propylene oxide without the aid of a base additive.

Synthesis and properties of cationic surfactants with tuned hydrophylicity

“…Within biological applications, they show a good antimicrobial activity [6] and can be used as drugs [7], gene delivery agents [8] or in DNA extraction methods [9]. Quite recently, cationic pyridinium surfactants have found applications in the synthesis of TiO 2 nanoparticles [10], in ionic liquids synthesis [11] or as electrolytes for dye-sensitized solar cells [12].…”

Inorganic–Organic Hybrid Surfactant Crystals: Structural Aspects and Functions

“…The single-headed surfactant forms a bilayer arrangement to realize a dense packing of long alkyl chains (Figure 8a, left), while the double-headed surfactant forms monolayer structures (Figure 8a, right). When a single-headed and single-chained surfactant is employed, the inorganic layers sometimes form a bilayer structure, probably due to the small size of monomeric ions (Figure 8b) [74,75,79,80]. To compensate for the negative charge of the inorganic anion, the charged hydrophilic heads of the surfactant come close to the anion.…”

Immobilization of Carbonylcobalt Catalyst by Poly(4‐vinylpyridine) (P4VP) through N→Co Coordination Bonds: The Promotional Effect of Pyridine and the Reusability of Polymer Catalyst

“…The most challenging problem in the production of 1,3‐PDO from EO is to explore a stable and reusable carbonylcobalt catalyst for alkoxycarbonylation of EO. So far, great efforts have been made in the preparation of reusable catalysts and in studying their catalytic properties for the alkoxycarbonylation of epoxides . As previously reported, the organometallic ionic liquids [ILs] + [Co(CO) 4 ] − exhibited excellent catalytic performances and considerable reusability for the alkoxycarbonylation of EO.…”