Novel (pipH 2 )[Co(TDA) ] is a rare example of quasi-octahedral Co( ii ) complex with mixed sulfur-oxygen environment exhibiting strong “easy-plane” type magnetic anisotropy and demonstrating field-induced single-ion magnet (SIM) behavior.

Octahedral coordination of molybdenum(III) is achieved by limiting the amount of cyanide available upon complex formation. Reaction of Mo(CF(3)SO(3))(3) with LiCN in DMF affords Li(3)[Mo(CN)(6)] x 6DMF (1), featuring the previously unknown octahedral complex [Mo(CN)(6)](3-). The complex exhibits a room-temperature moment of mu(eff) = 3.80 mu(B), and assignment of its absorption bands leads to t...

Metal complexes of 2,5-dicarboxamidopyrroles and 2,5-dicarbothioamidopyrroles have been structurally characterised for the first time, complementing the significant amount of work that has been reported for the analogous pyridine ligands. N,N'-Bis(3,5-dinitrophenyl)-3,4-diphenyl-1H-pyrrole-2,5-dicarboxamide forms octahedral bis(tridentate) complexes with cobalt(III) and nickel(II), where the li...

Complexes of histidine with Co( 11) in aqueous solution have been examined by proton magnetic resonance spectroscopy. Coordinate interaction of histidine with paramagnetic Co( 11) produces large contact interaction shifts in the histidine proton resonance spectra. Four histidine-Co( 11) complexes have been distinguished : a weak 1: 1 histidine-Co(I1) complex a t low pH ( < 4 ) in which only the...

In this study, mononuclear octahedral cobalt(III) Schiff base complex [CoL3], L = (5-bromo-2-hydroxybenzyl-2-furylmethyl)imine, was synthesized from the reaction of Co(NO3)2•6H2O and the Schiff base ligand L in methanol as solvent. It used as a new precursor to prepare spinel type cobalt oxide nanoparticles by a facile solid-state thermal decomposition. Controlling the temperature and time, Co3...

The colourful simplicial depth conjecture states that any point in the convex hull of each of d+1 sets, or colours, of d+1 points in general position inRd is contained in at least d 2 +1 simplices with one vertex from each set. We verify the conjecture in dimension 4 and strengthen the known lower bounds in higher dimensions. These results are obtained using a combinatorial generalization of co...

Local environments of ferric and ferrous irons were systematically studied with M€ ossbauer (at liquid helium temperature) and ultraviolet–visible–near infrared spectroscopic methods for various 18Na2O–72SiO2 glasses doped with 0.5 mol% Fe2O3. These were prepared at temperatures of 1300–1600 C in ambient air or at 1500 C under reducing conditions with oxygen partial pressures from 12.3 to 0:27 ...

Cyclic glyoxalcarbohydrazone[(1,2,4,5,8,9,11,12-octaazacyclotetradeca-5,7,12,14tetraene-3,10-dione) = (glyozalcarbzH)2] complexes of Ni II, PdII, CoII, ZnII and CdII of composition M (glyoxalcarbzH)2X2nH2O (M = Ni II, PdII, CoII,ZnII or CdII and X = Cl> , 1/2 SO4 -2 and n = 0,1 or 4) have been isolated by refluxing appropriate metal salts with glyoxal and carbohydrazide in requisite proportion ...

Synthetic procedures are described that allow access to a number of new Rh(III) complexes with the tetradentate bis-amide ligand N,N'-bis(2'-pyridinecarboxamide)1,8-naphthalene (LH2). These complexes have the formulae Rh(LH2)Cl3, Na[RhLX2] • H20 (X = Cl, CN) and [RhLA2]C104 (A = pyridine, 1-methylbenzotriazole). The compounds have been characterized by elemental analyses, conductivity measureme...