A reexamination of the structure of [ Cu(bipy)2 (ONO2)] (NO3).H2O suggests that it is best described as a distorted bicapped square pyramidal structure.
Artificial catalase has been prepared with Fe(III) tetrasulfonated phthalocyanine in place of heme and its structure and properties have been investigated by CD and difference spectroscopy, electrophoresis and catalase activity determination.
Ionisation potentials of the hydrogen atom and one-electron ions are calculated from the equation: I = (R∞hcZ2 μme)[1 + e4Z(Z−1)16ϵ02h2c2]
The cadmium(II) complexes of 2,4-dithiobiuret (Hdtb=L) : Cd2L3Cl4, CdL2X2 (X=Br, I, ClO4), CdL3SO4·H2O and CdL4(NO3)2 have been prepared and investigated by i.r. spectra. In all these complexes Hdtb is S-coordinated, principally behaving as a monodentate ligand, in some cases with a weaker interaction of the second thiocarbonylic sulphur atom. In the halide complexes the cadmium ion is six coordinated with halide bridging ions.
The oxidation of N,N-dimethylaniline with copper(II) is studied in different solvents. The contributions of the specific solvation, protolytic activity and dielectric properties to the overall solvent effect are reported.
Single crystal X-rays have shown that the I3SbCZ8 compound is of ionic structure, containing a centosymmetric I3CZ2+cation with a linear central part of tri-iodine atoms.
High proline levels in the roots of copper-tolerant Armeria maritima are associated with copper tolerance and are not a response to copper stress.
Rate = k(M-P)(H+)2 for a Mg2+ and Fe2+ water soluble porphyrin acid solvolysis reaction. Such rates parallel Buchler's stability index, Si, and the kinetic stability to acid solvolysis of 2+ metal ions is Ni>Cu>Co>Zn>Fe>Mn>Mg>Cd.
The position of americium within lanthanides in respect to unit cell volumes has been determined for 25 isostructural M m X n compounds. A linear correlation between the position of americium and the electronegativity of X atom has been demonstrated. This result has been explained in terms of greater covalent shortening of Am-X than of Ln-X bonds.
The mass spectra of coronate and cryptate complexes of alkali and alkaline earth salts were recorded using laser desorption and desorption chemical ionization. A comparison of the results obtained by these techniques shows that laser desorption is more accurate in characterizing the complexes. In laser desorption spectra, the ions are interpreted as being generated from the ligand and inorganic ions after ion/molecule reaction(s).
The efficiency of tetrakis-(4-N-methylpyridyl)porphineiron(III) as a superoxide dismuting catalyst has been determined using a pulse radiolysis technique.
By the action of N-bromosuccinimide on ,N′-bis(benzoylacetone)ethylene-diamine complexes of nickel(II) and copper(II), both the bromo and succinimido substitutions on methine carbons occured. Three products were simultaneously obtained: dibromo-, bromo-succinimido-, and disuccinimido substituted complexes.
The mixed metal compounds InGaX4·2L (X = Cl, Br; L = pyridine, piperidine, piperazine, 1,4-dioxan, tetrahydropyran, tetrahydrofuran) have been prepared and also the salts [(n-Bu)4N]2 InGaX6, (X = Cl, Br). Their Raman spectra have been recorded in the solid state and indicate that the compounds contain InGa bonds.
The structures of five cation distortion isomers of the five-coordinate [Cu(bpy)2Cl]+ cation range from trigonal bipyramidal to square pyramidal distorted trigonal bipyramidal, restricted by the bite of the 2,2′-bipyridyl ligands. The structures may be related by a structural profile involving a linear combination of the ν7 and ν8 modes of vibration of a trigonal bipyramidal CuN2N2'Cl chromophore in C2V symmetry.
At low temperatures (EtO)2P(O)HgY (Y = OAc,O3SCF3,Cl,Br,I,S2CNEt2,S2P(OEt)2, 2,5-pyrrolidinedionato-N, and (EtO)2P(O)) form coordination compounds (EtO)2P(O)c HgY(PR3)n (R = n-Bu, Ph; n = 1–3 depending on Y); 31P and 199Hg NMR data are reported.
