following our interest in reaching for a molded rubber article with possible detergent contact applications, durable silver nanopowder (agnp) is synthesized by arc discharge, then mixed with varying ratios of ethylene propylene rubber (epr), affording novel agnp@epr nanocomposites. x-ray diffraction (xrd) patterns of agnp as well as agnp@epr show no trace of impurity, while scanning electron mi...

The Py(2)N(4)S(2) octadentate coordinating ligand afforded dinuclear cobalt, copper and zinc complexes and the corresponding mixed metal compounds. The overall geometry and bonding modes have been deduced on the basis of elemental analysis data, MALDI-TOF-MS, IR, UV-vis and EPR spectroscopies, single-crystal X-Ray diffraction, conductivity and magnetic susceptibility measurements. In the copper...

The structure of copper(II) complexes formed with triethanolamine (TEA) core poly(amidoamine) (PAMAM) dendrimers from generation 0 (G0) to 4 (G4) were investigated by the electron paramagnetic resonance (EPR) technique and molecular simulations. Different square planar coordination modes were detected as a function of copper(II) concentration, whose dynamic evolution relates to the high structu...

In the present work, the effects of operating conditions including pH, transmembrane pressure, oil concentration, and temperature on fouling resistance and the rejection of turbidity for a polymeric membrane in an ultrafiltration system of wastewater treatment were studied. A new modeling technique called evolutionary polynomial regression (EPR) was investigated. EPR is a method based on regres...

Oxalate decarboxylase from Bacillus subtilis is composed of two cupin domains, each of which contains a Mn(II) ion coordinated by four identical conserved residues. The similarity between the two Mn(II) sites has precluded previous attempts to distinguish them spectroscopically and complicated efforts to understand the catalytic mechanism. A multifrequency cw-EPR approach has now enabled us to ...

15 halo (I≥1/2) complexes of Ti (III), V (IV) and Cu (II) each possessing one unpaired electron were studied using DFT implemented in ADF.2010.02. A ten , NQCC and η parameters of metal ions and ligands were obtained from ESR/EPR program while their s and δ parameters were given by NMR/EPR program after optimization of complexes. Ligands having same values of these 5 parameters were spatially e...

Fe(II)-Bleomycin is activated in air to form an electron paramagnetic resonance (EPR)-active species, termed "activated bleomycin", that cleaves DNA, when present. When DNA is absent, the potential DNA cleavage activity is lost and the drug becomes self inactivated. A method is described for the preparation and purification of this self-inactivated product from bleomycin A2, together with some ...

Mono- and dinuclear Cu(ii) complexes were prepared with pseudopeptidic open chain and macrocyclic ligands, respectively. They were characterized by UV-vis spectroscopy, EPR, HRMS and X-ray diffraction. The Cu(ii) cation is coordinated by two amines and two deprotonated amides, in a slightly distorted square planar coordination geometry. The complexes interact with several substituted dicarboxyl...

Ferrous hemeproteins and inorganic heme complexes react with nitric oxide to form six-coordinate paramagnetic complexes. These complexes exhibit strong EPR signals centered near g = 2.0 which are easily observed in frozen solution. We have obtained EPR spectra of the nitrosyl adducts of Fe(II) protoporphyrin IX-imidazole in dimethylsulfoxide and in dimethylformamide, and of myoglobin, cytochrom...

Um novo ligante macrocíclico binucleador, N,N-bis(2,6-diiminometil-1hidroxifenil)malonoildicarboxamida, foi preparado. Seus complexos metálicos foram preparados pelo método da moldagem por metal, através das reações de 2,6-diformil-4-metilfenol, malonoil diidrazida com os cloretos metálicos de Cu(II), Ni(II), Co(II), Cd(II), Zn(II) e Hg(II), em methanol, que levaram à formação de uma série de c...