Behavior of the amphiphile CHAPS alone and in combination with the biopolymer inulin in water and isopropanol-water media

Self-aggregation of the zwitterionic surfactant 3-[(3-cholamidopropyl)dimethylammonio]-1-propanesulfonate (CHAPS) in water and isopropanol-water media, and interaction of the amphiphile with the biopolymer inulin in these media were investigated. The micellar properties of the zwitterionic surfactant and its associated interfacial and bulk properties along with the related energetic, and aggregation number were determined. The different stages of interaction of the CHAPS-inulin combines were identified and assessed. The complexes were formed and aggregated in solution at different stages of their molecular compositions. The aggregated sizes were determined by dynamic light scattering study and the morphology in the solvent removed states were examined using scanning electron microscope and transmission electron microscope techniques. The results witnessed formation of ensembles of varied and striking patterns.     

Synthesis and Crystal Structure of [Cu(BDBPH)(ClO<Subscript>4</Subscript>)<Subscript>2</Subscript>] (BDBPH = Butane-2,3-dione bis(2′-pyridylhydrazone)

Abstract  

Butane-2,3-dione bis(2′-pyridylhydrazone) (BDBPH), a Schiff-base condensate, was synthesized by 1:2 mol ratio condensation of butane-2,3-dione with 2-hydrazino pyridine in dehydrated methanol. BDBPH has been characterised by C, H and N microanalyses, FT-IR, ¹H NMR and UV–Vis spectra. Reaction of 1:1 stoichiometric proportion of BDBPH with copper(II)perchlorate hexahydrate in methanol affords a mononuclear copper(II) complex, [Cu(BDBPH)(ClO₄)₂] (1). 1 crystallizes in the monoclinic space group P [`1] \overline{1} with a = 8.4230(2), b = 9.7869(3), c = 12.3508(3) ?, α = 103.784(2), β = 90.900(2), γ = 94.906(2)^°, V = 984.51(5) ?³ and Z = 2. The copper(II) compound is octahedral and one-electron paramagnetic. Bond Valence Sum (BVS) model calculation was also performed to assign the oxidation number of the copper center.     

Dinuclear PdII complexes bearing mixed NHC/Py/PPh3 donor set ligands: Catalytic applications and electrochemical investigations

Bimetallic palladium(II) complexes containing classical NHC donor ligands are becoming increasingly popular owing to their various catalytic applications. However, examples of the aforementioned complexes with mixed NHC/PPh₃ ligands are still rare. Bimetallic palladium(II) complexes possessing these mixed ligands are described starting from a C2-symmetric bis-imidazolium salt containing 4,4′-substituted central biphenyl ring. All the palladium(II) complexes have been tested as precatalysts in α-arylation of oxindole and Suzuki–Miyaura coupling reactions. The complex composed of mixed NHC/PPh₃ donor ligands shows superior catalytic activity compared with the corresponding PEPPSI type complexes when applied in α-arylation of oxindole. The dinuclear complexes display better activity compared with the mononuclear complexes. The preliminary electrochemical measurements show the facile oxidation of Pd^II in the presence of combined NHC/PPh₃ ligands compared with a combination of NHC/Py ligands.