Two new examples of mixed metal copper(I) sulfites, namely, Na3Mn2Cu(SO3)4(H2O)5 (1) and NaMn4Cu(SO3)5(H2O)3 (2), have been synthesized and structurally characterized. The 1D structure of 1 is built from a chain of [Mn2Cu(SO3)4]3- bridged by Na+ ions whereas the structure of 2 features a complicated 3D framework in which Mn8O36 octanuclear clusters are bridged by sulfite anions and copper(I) io...

Investigation of nonspecific interactions of metal ions with proteins and studies of biological function of such complexes are of importance (Breslow 1978; Friedberg 1975). Identification of the binding centers of metal ions with proteins and determination of the binding constants are necessary to explain the transfer mechanisms of these ions by proteins. Earlier it has been shown (Lau et al. 1...

Multicopper oxidases (MCOs) are a family of enzymes that use copper ions as cofactors to oxidize various substrates. Previous research has demonstrated that several MCOs such as MnxG, MofA and MoxA can act as putative Mn(II) oxidases. Meanwhile, the endospore coat protein CotA from Bacillus species has been confirmed as a typical MCO. To study the relationship between CotA and the Mn(II) oxidat...

In the centrosymmetric dinuclear title compound, [Mn(2)Cl(4)(C(15)H(14)N(4))(2)(H(2)O)(2)], the Mn(II) atom is coordinated by an N,N'-bidentate ligand, a water mol-ecule, a terminal chloride ion and two bridging chloride ions in a distorted MnN(2)OCl(3) octa-hedral geometry. The Mn⋯Mn separation is 3.6563 (9) Å. In the crystal structure, O-H⋯N and O-H⋯Cl hydrogen bonds help to establish the pac...

In the title compound, [Mn(C6H6O4)(C12H12N2)(H2O)] n , the cyclo-butane-1,1-di-carboxyl-ate (cbdc) ligands bridge three Mn(II) ions, forming layers parallel to the ac plane. These layers are additionally connected by 1,2-bis-(pyridin-4-yl)ethane ligands to form a three-dimensional polymeric framework. An inversion centre is located at the mid-point of the central C-C bond of the 1,2-bis-(pyridi...

in the present study, micellar-enhanced ultrafiltration (meuf) was used to remove manganese (mn) (ii) from synthetic wastewater. the effects of different operational conditions on the filtration performance of meuf or the membrane were studied. it was found that the transmembrane pressure has a major influence on the permeate flux and an insignificant effect on the rejection coefficient. the pe...

The deposition of Mn(12) single molecule magnets on gold surfaces was studied for the first time using combined X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD) methods at low temperature. The ability of the proposed approach to probe the electronic structure and magnetism of Mn(12) complexes without significant sample damage was successfully checked on bulk samp...

Abstract Heavy metals such as Cu(II) and Mn(II) are prevalent in the environment. The effect of heavy on soils environment is based ability to mobilize these contaminants. According soil decontamination perspective, examining reaction technique between indispensable. This study carried out experiments investigate adsorption behaviour quartz sand. isothermal results for presented that capacity r...

The title compound, [Mn6(C7H4NO3)5(CHO2)2(C3H4N2)5(CH3OH)]·3.36CH3OH·0.65H2O, or Mn(II)(O2CH)2[15-MCMn(III)N(shi)-5](Im)5(MeOH)·3.36MeOH·0.65H2O (where MC is metallacrown, shi(3-) is salicyl-hydroximate, Im is imidazole and MeOH is methanol), contains five Mn(III) ions as members of the metallacrown ring and an Mn(II) atom bound in the central cavity. The central Mn(II) atom is seven-coordinate...

Transition row metal ions are both essential and toxic to microorganisms. Zinc in excess has significant toxicity to bacteria, and host release of Zn(II) at mucosal surfaces is an important innate defence mechanism. However, the molecular mechanisms by which Zn(II) affords protection have not been defined. We show that in Streptococcus pneumoniae extracellular Zn(II) inhibits the acquisition of...