Palladate Salts from Chiral Pyridinium Ionic Liquids: Synthesis and Crystal Structures

Abstract

This paper reports the preparation, characterization and the crystal X-ray structures of metal-containing ionic liquid complexes based on chiral pyridinium cations and tetrachloropalladate (II) [PdCl 4 ] 2-.

Ionic Liquid/Oil Microemulsions as Chemical Nanoreactors

“…In all of these organized phases, the surfactant concentration was fixed at 0.3 mol L −1 (weight fraction 20%) as for SANS, NMR, and DLS analyses, and the weight fractions of IL were 12, 18, 20, and 37% in phases I−IV, respectively. In this study, two palladium catalysts were used, Pd 2 (dba) 3 ·CHCl 3 and a chiral compound bis[( R )-1-phenylethylpyridinium)] tetrachloropalladate (abbreviated [Pyr] 2 [PdCl 4 ] and shown in Figure S5 in Supporting Information), prepared as previously described. , The latter was used to test for potential chirality transfer from the catalyst.…”

The conformational polymorphism and weak interactions in solid state structures of ten new monomeric and dimeric substituted dibenzyldimethylammonium chloridopalladate salts

“…The elemental analyses suggest that a small amount of the other form of the anion is formed in the bulk samples of 1 and 6, since the calculated values are somewhat higher than the measured ones (approximately 2% w.r.t. carbon mass%) in the case of the monomeric compound (1) and lower for the dimeric (6). Powder diffraction analysis does not show the existence of mixtures in either compound 1 or 6, since no visible peaks of the other form are observed in either structure.…”

“…The structural properties of quaternary (including pyridinium and imidazolium) ammonium (QA) halidometallates, typically QA 2 MX 4 (where M ¼ Fe, Co, Ni, Cu or Zn), have been widely studied because of their ability to undergo phase transitions, to possess thermochromic behavior and the tendency to exhibit both liquid and liquid crystalline states. [1][2][3][4][5][6] Quaternary ammonium salts have also been successfully established as precipitating agents for platinum group metals. 7 By altering either the cation or the halidometallate anion there are limitless possibilities of tuning the different properties of QA 2 MX 4 compounds.…”

Palladate salts from ionic liquids as catalysts in the Heck reaction

“…22 [Pyr] 2 [PdCl 4 ] was prepared using the protocol given by Tourneux and al. 23 The measurements of optical rotations were performed at 20°C in a Perkin-Elmer 241 Polarimeter (Na lamp, λ = 589 nm). Conversion percents of reactant and yields of reaction were determined by HPLC on a Waters Alliance 2695 HPLC system (Waters Corp., Milford, MA, USA) composed of a quaternary gradient pumping system with vacuum degasser.…”