An extraction-spectrophotometric method for the determination of trace amounts of ammonium ion is described. Ammonium ion is effectively extracted as a neutral ternary complex NH . DB 18C6. calmagite at pH 3.0 into chloroform, followed by spectrophotometric determination at =48 5 nm. Molar absorptivity of the ternary complex at this wavelength is 1.08 10 mol cm . Beer's law is obeyed over...

Cytochrome c oxidase (ferrocytochrome c: oxygen oxidoreductase, EC 1.9.3.1) has been resolved into a pair of complexes of unequal molecular weight. The larger complex (electron transfer complex) contains exclusively the oxidation-reduction proteins characteristic of cytochrome oxidase; the smaller complex (ion transfer complex) shows exclusively the capability for cation-dependent induction of ...

The effect of contact ion pairs and comparison the three halide ions on electrophilic C-H activation during base-free synthesis Ru(III)-NHC complexes [RuIII(PyNHCR)(Cl)3(H2O)] (1a; R = Me, 1b; iPr) have been investigated. DFT modelling two pathways for formation complexes, viz. coordination pathway ion-pair pathway, reveals generation carbene. path is preferred azolium salts with Cl− I−, wherea...

Time-resolved resonance Raman spectroscopy (TR3) has been used to study the effect of solvent polarity on the mechanism and nature of intermediates formed in photoinduced electron-transfer reaction between triplet flouranil ((3)FL) and tetramethylbenzene (TMB). Comparison of the TR3 spectra in polar, nonpolar, and medium polar media suggests that formation of radical anion due to electron-trans...

Alkyl-chain ferrocene cationic surfactants (ACFcCS) can form ion-pair complexes with anions, and are then adsorbed at hydrophobic electrode surfaces or extracted to organic layers. The amount of adsorbed ACFcCS-anion complex is dependent on the anion concentration in a solution, and the anion concentration can be determined from the current intensity of the oxidation wave of the ferrocene part ...

Clomipramine hydrochloride, active component of an antidepressant drug, was determined in the pharmaceutical formulation by two kinds of potentiometric sensor; a PVC membrane sensor and a carbon paste electrode modified by MWCNTs and ionic liquid. Both sensors were corporated with clomipramine-tetraphenylborate ion-pair complex and they respond based on ion exchange mechanism. The best PVC memb...