A novel mechanism of amplifying pH oscillations by pH-dependent EDTA-metal ion complexation is proposed. If there is a metal ion involved in the H(+) consuming reactions in the pH oscillator and the metal's complex formation constant is big enough, the nonlinear coupling of the original oscillator with the complexation induced metal ion oscillation can finally amplify the pH oscillation. This e...

Redox-inactive metal ions play crucial roles in tuning the reactivity of oxygen-containing metal complexes and metalloenzymes such as the oxygen-evolving complex (OEC) in photosystem II (PSII) and its small-molecule mimics. In PSII, a Ca ion is part of the tetrameric Mn cluster, Mn4CaO5, and is integral to the water oxidation catalysis and evolution of oxygen by the OEC. Several different funct...

A comparative research has been developed for acidity and stability constants of M(Glu), M(Asp) and M(Ttr) complexes, which have been determined by potentiometric pH titration. Depending on metal ion-binding properties, vital differences in building complex were observed. The present study indicates that in M(Ttr) complexes, metal ions are arranged to the carboxyl groups, but in M(Glu) and M(As...

n-propylsalicylidene based on silica as ion exchanger (ie) was used for the separation by complexation of mn2+, co2+, ni2+, cu2+, hg2+, cr3+, fe3+, and uo22+ from their parent solutions. ie and its metal complexes are characterized by elemental analysis, electronic and infrared spectra, in addition to thermal analysis in atmospheric pressure. the mode of chelation and the proposed geometric str...

In the title complex, [CuBr(C(15)H(21)N(2)O)], the Cu(II) atom is coordinated by one phenolate O, one imine N and one amine N atom of the tridentate Schiff base ligand and by one bromide ion, resulting in a distorted CuBrN(2)O square-planar geometry for the metal ion, with the N atoms in a cis conformation.

In the title complex, [Zn(C(12)H(17)N(2)OSe(2))(2)], the Zn(II) ion is six-coordinated by two N,N',O-tridentate Schiff base ligands, resulting in a slightly distorted trans-ZnO(2)N(4) octa-hedral coordination for the metal ion.

In the title complex, [Zn(C(13)H(16)NOS(2))(2)], the Zn(II) ion is four-coordinated by two N,O-bidentate Schiff base ligands, resulting in a distorted trans-ZnN(2)O(2) square-planar geometry for the metal ion.

In the title complex, [NiCl(2)(C(27)H(27)NP(2))], the Ni(2+) ion is coordinated by two chloride ions and two P atoms of the bidentate N,N-bis-(diphenyl-phosphan-yl)propyl ligand to generate a strongly distorted cis-NiCl(2)P(2) square-planar geometry for the metal ion. A NiP(2)N rhombus occurs within the chelating ligand.

In the title complex, [Zn(C(11)H(12)NO(2))(2)], the Zn(2+) ion (site symmetry 2) is coordinated by two N,O-bidentate Schiff base ligands, generating a tetra-hedral ZnO(2)N(2) geometry for the metal ion.