Laser flash and continuous photolysis studies of equilibrated solutions of CuCl−2CuCl−32, Cu(CN)−2Cu(CN)32− and Cu(CN)−2Cu(CN)2Cl2− systems were carried out in the UV region. Neutral aqueous solutions of the complexes produce hydrated electrons when they absorb pulses of laser light at 266...

The reaction between hydrogen peroxide and a mixture of cyanocuprate(I) species at pH 11.2 is selectively catalysed by traces of osmium. With potentiometric or amperometric monitoring, osmium concentrations up to 1 ngml can be determined, with a lowest determinable concentration of 0.03 ngml. In...

The three cyanocuprate(I) complexes, Cu(CN)2−, Cu(CN)32−, and Cu(CN)43−, photoeject electrons with high efficiency when excited in aqueous solution by 266 nm laser pulses of 7 ns duration with quantum yields of 0.37±0.06, 0.224±0.021, and 0.240±0.005, for Cu(CN)2− (at 2 M ionic strength), Cu(...

The possibility to reconstitute hemocyanin with copper(II) ions can be explained by the reduction of these ions by residual cyanide and by the formation of a stable copper(I) complex that introduces copper(I) into the active site of hemocyanin. The reconstitution of hemocyanin with cyanocuprate(...

The reaction mechanism of the non-enzymatic stereoselective formation of the (3S, 3aS, 7aR) configuration of the wine lactone from the (6R) form of (E)-8-carboxylinalool in acidic aqueous solution was analyzed by quantum chemistry calculations. The transition states for the cyclization and hydri...

Six new biphenyl quinolizidine lactone alkaloids: 14α-hydroxydecodine (1), 14β-hydroxydecodine (2), 4″-O-demethylheimidine (3), 4″-O-demethyl-9β-hydroxyvertine (4), 4″-O-demethylvertine N-oxide (5), and 4″-O-demethyl-9β-hydroxyvertine N-oxide (6) were isolated from so-called “sinicuichi...

The retention of eight cyanophenyl herbicides on water-insoluble β -cyclodextrin polymer beads (BCDP) was determined by thin-layer chromatography using BCDP as stationary phase. The effects of pH, salt concentration in the aqueous eluent systems and the various physico-chemical parameters of he...

The object of this effort is conversion of a toxic alkaloid into a proper acidic ionic liquid catalyst, so nicotinium sulfate (3-(1-methylpyrrolidin-2-yl) pyridine·H2SO4 or NHS) was prepared as a new protic ionic liquid by treatment of sulfuric acid with ethereal phase of nicotine extracted fro...

l-Arabinose diethyl dithioacetal was converted, via its 4-azido-5-S-benzoyl-4-deoxy-2,3-O-isopropylidene-5-thio-d-xylose diethyl dithioacetal, into 4-azido-4-deoxy-5-thio-α-d-xylopyranose triacetate 29. Glycosidation of 29 with 4-cyanothiophenol in the presence of trimethylsilyl triflate gave t...

Therapies addressing multiple stages of Plasmodium falciparum life cycle are highly desirable for implementing malaria elimination strategies. MMV019918 (1, 1-[5-(4-bromo-2-chlorophenyl)furan-2-yl]-N-[(piperidin-4-yl)methyl]methanamine) was selected from the MMV Malaria Box for its dual activity...

The heterogeneous rate constant k0 of the ferrocene/ferrocenium (Fc/Fc+) redox couple and the diffusivities (DFc and DFc+) of the two species were measured in a toluene/trihexyl(tetradecyl) phosphonium tris(pentafluoroethyl) trifluorophosphate solution. This ionic liquid allowed to increase suff...

Electrochemical oxidation of ferrocene (Fc) at platinum and glassy carbon electrodes in the ionic liquid 1-ethyl-3-methylimidazolium tetrafluoroborate, EMIMBF4, has been studied by cyclic voltammetry (CV), convolutive potential sweep voltammetry (CPSV), chronopotentiometry (CP) and chronoamperom...

Cyclic voltammograms, electronic and Mössbauer spectra were recorded for a series of sterically hindered ferrocenes bearing trimethylsilyl and tert-butyl groups Fe[η5-C5H3(EMe3)2-1,3]2, Fe[η5-C5H2(EMe3)-4-(SiMe3)2-1,2]2 (E = C, Si), and Fe[η5-C5H2(SiMe3)3-1,2,4](η5-C5R5) (R = H, CH3). The re...

The electrochemical behavior of four organometallic redox couples has been studied in the room temperature ionic liquid 1-ethyl-3-methylimidazolium tetrafluoroborate. Diffusion controlled anodic and cathodic peaks were found for the redox couples Fc/Fc+ (ferrocene/ferrocenium), Cc/Cc+ (cobaltoce...

Minor perturbations caused by the interannular trimethylene bridges in a series of ferrocenium cations have pronounced effects on the electronic structure. The X-ray structure of 1,1′:3,3′-bis(propane-1,3-diyl)ferrocenium triiodide has been determined at 298 K: monoclinic, C2/c, a = 11.110(2) ...

The behaviour of chemically or electrochemically generated ferrocenium cations has been studied in some polar organic solvents (DMF, DMSO, acetonitrile, acetone, methylene chloride) under molecular oxygen. Adducts between oxygen and ferrocenium species can differently evolve according to the sol...

The electrochemical reduction of a series of aliphatic and aromatic bromides on glassy carbon, silver and copper electrodes has been investigated by cyclic voltammetry in 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIm]BF4). As in polar aprotic solvents, reductive cleavage of aromatic bromi...

Alkyl-substituted ferrocenium salts have limited solubility in epoxy oligomers and produce poisonous arene by photolysis. Herein, the synthesis and photoactivity of several alkoxy-substituted ferrocenium salts as long-wavelength UV light photoinitiators have been reported. [Cyclopendadien-Fe-ani...

The electrochemical reduction of a series of aliphatic and aromatic bromides on glassy carbon, silver and copper electrodes has been investigated by cyclic voltammetry in 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIm]BF4). As in polar aprotic solvents, reductive cleavage of aromatic bromi...

The interdigitated and layered structures of the tetraalkylferrocenium salts [DEC][CB11H12], [DEC]2[B12F12], [DEC][BF4], [DEC][PF6], and [DEC][ClO3] were determined by single-crystal X-ray diffraction (DEC+ = 1,1′,3,3′-tetrakis(2-methyl-2-nonyl)ferrocenium(1+)). The structures of the salts of ...