The modern physico-chemical, spectroscopic and biochemical methods have proved an important tool to elucidate the constitution of transition metal complexes. This paper presents a brief account of the synthesis, spectroscopic and medicinal aspects of tetraazamacrocyclic compounds of manganese(II). Sixteen to eighteen membered tetraamide macrocyclic ligands DTTD(1) and DTTD(2) have been synthesi...

Recently, manganese-oxide compounds have attracted considerable attention, in particular, as candidate materials for photochemical water-splitting reactions. Here, we investigate electronic states of pristine manganese dioxides (MnO2) in different crystal phases using spin-polarized density functional theory (DFT) with Hubbard U correction. Geometrical structures and band dispersions of α-, β-,...

Metal contamination represents one of the major sources of pollution in marine environments. In this study we investigated the short-term effects of ecologically relevant cadmium and manganese concentrations (10(-6) and 3.6 x 10(-5) M, respectively) on females of the sea urchin Paracentrotus lividus and their progeny, reared in the absence or presence of the metal. Cadmium is a well-known heavy...

Manganese-based compounds have been regarded as the most promising cathode materials for rechargeable aqueous zinc-ion batteries (AZIBs) due to their high theoretical capacity. Unfortunately, Zn–manganese dioxide (MnO2) poor cycling stability and are unstable across a wide temperature range, severely limiting commercial application. Cationic preinsertion defect engineering might increase active...

Escherichia coli does not routinely import manganese, but it will do so when iron is unavailable, so that manganese can substitute for iron as an enzyme cofactor. When intracellular manganese levels are low, the cell induces the MntH manganese importer plus MntS, a small protein of unknown function; when manganese levels are high, the cell induces the MntP manganese exporter and reduces express...

Concern over the neurotoxic effects of chronic moderate exposures to manganese has arisen due to increased awareness of occupational exposures and to the use of methylcyclopentadienyl manganese tricarbonyl, a manganese-containing gasoline antiknock additive. Little data exist on how the oxidation state of manganese exposure affects toxicity. The objective of this study was to better understand ...

Manganese represents an essential trace element that is accumulated and utilized by virtually all forms of life. This redox active metal is a key cofactor for a wide range of metalloenzymes, including oxidases and dehydrogenases, DNA and RNA polymerases, kinases, decarboxylases, and sugar transferases (11, 25). In addition to serving as an essential nutrient, manganese can also be toxic. In hum...

Manganese coatings are excellent for the cathodic protection of steel against corrosion. Although manganese is more electrochemically active than widely used protective zinc, exceptional resistance in neutral and basic media determined by film insoluble corrosion products, which forms on surface greatly suppresses its further It known that electrodeposition process Mn from sulphate electrolytes...

Oxidation of manganese (II) to manganese (III,IV) demands oxidants with very high redox potentials; consequently, manganese oxides are both excellent proxies for molecular oxygen and highly favorable electron acceptors when oxygen is absent. The first of these features results in manganese-enriched sedimentary rocks (manganese deposits, commonly Mn ore deposits), which generally correspond to t...

antioxidants act as free radical scavengers in the oxidation processes. thus, they will certainly play diverse roles in the biological systems and the therapy of a wide variety of diseases. regarding this fact, in the present study, we synthesized two new salen ligand compounds by the condensation of ethylendiamine and salicylaldehyde derivatives in excellent yields.the structures of these liga...