Dinuclear cobalt-1,10-phenanthroline (1) and 2,2'-bipyridine (2) complexes bridged by 1,8-bis(2,2':6',2''-terpyrid-4'-yl)anthracene (btpyan) were prepared. Both of the complexes selectively catalysed the electrochemical four-electron reduction of dioxygen to H2O without the generation of H2O2 as a two-electron reduction product.

Ab initio MP2/aug’-cc-pVTZ calculations have been carried out to determine the structures and binding energies of complexes BeF2, BeF3–1, BeF4–2 with n H2O molecules, n = 1–6. For each ...

The solubility of fluorite in H2O and H2O–NaCl has been measured at 600–1000 °C, 0.5–2.0 GPa in a piston–cylinder apparatus. Fluorite dissolves congruently at all conditions investigated. The data indicate that the concentration of fluorite dissolved in H2O is low at 600 °C and 0.5 GPa (0.0014 mol/kg H2O) but increases strongly with temperature (T) and pressure (P) to 0.247 mol/kg H2O at 1000 °...

We present the synthesis and characterization of alkali metal salts of the new tetraanionic, tetrapodal ligand 2,2'-(pyridine-2,6-diyl)bis(2-methylmalonate) (A4[PY(CO2)4], A = Li(+), Na(+), K(+), and Cs(+)), via deprotection of the neutral tetrapodal ligand tetraethyl 2,2'-(pyridine-2,6-diyl)bis(2-methylmalonate) (PY(CO2Et)4). The [PY(CO2)4](4-) ligand is composed of an axial pyridine and four ...

Ab initio calculations have been used to study the structure and stability of several doubly charged molecular ions in the gas phase. In particular the complexes of water and ammonia with Si, Ge, Sn and Pb have been studied. Geometries have been obtained at B3LYP/6-31G(d) level and final energies at CCSD(T)/6-311+G(3df,2p) level. Different fragmentation channels have been considered. The loss o...

For the first time investigation of water molecule complexed with methylamine (CH3NH2) in solid neon was performed from 80 to 6000 cm−1 using Fourier transform infrared spectroscopy. From concentration effects and help theoretical results we have identify several vibrational transitions for CH3NH2 dimer, CH3NH2-H2O, CH3NH2-(H2O)2 complexes. CH3NH2-H2O complex, where two submolecules interacting...

Molybdenum(VI) catalysts were obtained from methanol or acetonitrile by the reaction of [MoO2(C5H7O2)2] and isonicotinoyl- nicotinoyl-based aroylhydrazones. Reactions in resulted formation mononuclear complexes [MoO2(L1–4)(MeOH)] (1a–4a), while ones provided polynuclear [MoO2(L1–4)]n (1–4). Crystals compound, [MoO2(L3)]n?H2O (3?H2O), suitable for X-ray diffraction analysis solvothermal procedur...

A new heterocyclic hydrazone Schiff base ligand, N'-(4-(diethylamino)-2-hydroxy benzylidene)-4-oxopiperidine-1-carbohydrazide, (H2L) was derived by a condensation reaction of 4-oxopiperidine-1-carbohydrazide with 4-(diethylamino)-2-hydroxybenz-aldehyde. The ligand reacts chloride salts chromium(III), manganese(II), iron(III), cobalt(II), nickel(II), copper(II) and zinc(II) to form metal complex...

The Schiff bases and their complexes have an observed biological efficacy, so in the current study it has been prepared, characterized evaluated activity of some metal with copper nickel based on ortho-phathaldehyde as a primary compound. A new ligands {[Cu(L)n(H2O)2]Cl2.mH2O [Ni(L)n].mH2O, where L=N',N'''-((1E,1'E)-1,2-phenylenebis(methanylylidene)) di(benzohydrazide) L1, N',N'''-((1E,1'E)-1,2...

Two novel vanadium(III) complexes: V(dipic)(Hbdc)(H2O)2 (1) and [V2(dipic)2(H2btec)(H2O)4]·2H2O (2) (H2dipic = 2,6-pyridinedicarboxylic acid, H2bdc = 1,3-benzene-dicarboxylic acid, H4btec = 1,2,4,5-benzenetetracarboxylic acid) are synthesized by the reaction of V2(SO4)3, 2,6-pyridinedicarboxylic acid and 1,3-benzene-dicarboxylic acid (for 1) or 1,2,4,5-benzenetetracarboxylic acid (for 2) under ...