Whereas there are hundreds of known iron(II) spin-crossover compounds, only a handful of cobalt(II) spin-crossover compounds have been discovered to date, and hardly an in depth study on any of them exists. This review begins with an introduction into the theoretical aspects to be considered when discussing spin-crossover compounds in general and cobalt(II) systems in particular. It is followed...

Bis-(L-tyrosinato)copper(II) was reacted with 3-(chloropropyl)-trimethoxysilane functionalized silica that has infused magnetite to yield a magnetically separable catalyst in which the copper carboxylate is covalently linked to the silica matrix through the silane linkage. The immobilized catalyst has been characterized by spectroscopic studies (such as FT-IR, EPR, Magnetic Measurement...

lmidazolate bridged homo/hetero binuclear complexes of copper(II), nickei(II) and zinc(II) formed with glycylvalinate have been studied by pH-metry, EPR and visible absorption spectrometry in aqueous medium at 25 ± I 0 and I= 0.1 M NaCI04• The experimental data have been obtained for the followin~ species (A. = glycylvalinate and 8 =imidazole) :M +, AHt , AH, A·, 8W, 8 , M(OHt. M(OHh. M(At, M(A...

We have used thermoluminescence (TL) and EPR measurements of Photosystem II (PS II) from spinach in order to identify charge pairs responsible for TL bands in the region of 40-50°C including the 'C-band' (peak V) and the TL band from PS II depleted of calcium. In intact PS II membrane preparations, in the presence of DCMU, a TL band at 50°C is induced following illumination at 77 K. This band d...

Rock powder of dolomite samples from the Renison mine area of Tasmania, Australia were analyzed by electron paramagnentic resonance spectroscopy (EPR), Atomic Absorption and Mass Spectrometer to identify alteration related to mineralisation. The least-altered dolomite samples, which are not effected by circulation of diagenetic and hydrothermal fluids are characterised by low Mn and Fe and ...

Recent evidence has indicated the presence of novel plastoquinone-binding sites, QC and QD, in photosystem II (PSII). Here, we investigated the potential involvement of loosely bound plastosemiquinones in superoxide anion radical (O2-) formation in spinach PSII membranes using electron paramagnetic resonance (EPR) spin-trapping spectroscopy. Illumination of PSII membranes in the presence of the...

Biogenesis and repair of the inorganic core (Mn4CaO(x)Cl(y)), in the water-oxidizing complex of photosystem II (WOC-PSII), occurs through the light-induced (re)assembly of its free elementary ions and the apo-WOC-PSII protein, a reaction known as photoactivation. Herein, we use electron paramagnetic resonance (EPR) spectroscopy to characterize changes in the ligand coordination environment of t...

The use of a sodium in chloride dispersion is systematically evaluated for the synthesis nickel(0) and nickel(I) complexes from readily-prepared nickel(II) precursors. A variety with phosphine bipyridine-type ligands were accessed, although some reactions found to produce mixtures nickel(I), yields highly variable. Several new obtained, these characterized using techniques including NMR spectro...

In this study, spectroscopic, dosimetric and stability characteristics of free radicals formed in acetazolamide (ACE) sample as a result gamma irradiation the range 0–15 kGy were determined using electron paramagnetic resonance (EPR) spectroscopy. For purpose, by interpreting spectra 0–100 mW microwave power region, it was that two different sample. The structures after attributed to CH3OṄ-(rad...

Transition metal complexes of Co(II), Ni(II) and Cu(II) metal ions with general stoichiometry [M(L)X]X and [M(L)SO(4)], where M = Co(II), Ni(II) and Cu(II), L = 3,3'-thiodipropionic acid bis(4-amino-5-ethylimino-2,3-dimethyl-1-phenyl-3-pyrazoline) and X = NO(3)(-), Cl(-) and OAc(-), have been synthesized and structurally characterized by elemental analyses, molar conductance measurements, magne...