A new coumarin-appended thioimidazole-linked imine conjugate, viz. has been synthesized and characterized. has been found to recognize Cu(2+) selectively among a wide range of biologically relevant metal ions. The chemosensing behavior of has been demonstrated through fluorescence, absorption, visual fluorescence color changes, ESI-MS and (1)H NMR titrations. The chemosensor showed selectivity ...

We present the results of a successful synthesis and investigation polycrystalline Fe2+(Cr3+, Fe3+)2O4 powder, where 1/8 part Cr3+ ions in octahedral sites is substituted by Fe3+ ones. It shown that under such doping, material retains cubic spinel structure characteristic parent FeCr2O4 compound. However, values critical temperatures have changed. Both orbital magnetic orderings occur at about ...

A new asymmetric pentadentate ligand was designed to impose low symmetry to trivalent ions. Five-coordinate Fe3+ and Ga3+ complexes were investigated by crystallographic, electrochemical, and electron paramagnetic resonance methods showing enhanced redox reversibility. Calculations were performed to account for the observed trends.

BACKGROUND Many important geochemical and biogeochemical reactions occur in the mineral/formation water interface of the highly abundant mineral, goethite [α-Fe(OOH)]. Ab initio molecular dynamics (AIMD) simulations of the goethite α-FeOOH (100) surface and the structure, water bond formation and dynamics of water molecules in the mineral/aqueous interface are presented. Several exchange correl...

The measurement of trace analytes in aqueous systems has become increasingly important for understanding ocean primary productivity. In oceanography, iron (Fe) is a key element in regulating ocean productivity, microplankton assemblages and has been identified as a causative element in the development of some harmful algal blooms. The chemosenor developed in this study is based on an indicator ...

In this paper we demonstrate that NADPH-initiated oxidative damage of microsomal proteins occurs in the absence of free metal ions and that this protein oxidation is mediated by cytochrome P450 (cyt P450). Oxidized proteins are rapidly degraded by proteases. Ascorbate (AH2) specifically inhibits free metal ion-independent cyt P450-mediated protein oxidation and thereby prevents subsequent prote...

Highly purified iron superoxide dismutase was obtained from Escherichia coli B using a modification of the procedure of Yost and Jridovich (Yost, F. J., Jr., and Fridovich, I. (1973) J. Biol. Chem. 248, 4905-4908). The protein contained 1.8 +/- 0.2 atoms of iron per 38,700 g of protein. We have found that cyanide does not bind to the Fe3+ ion of iron dismutase but fluoride and azide have modera...