Showing papers in "Polyhedron in 2000"

TL;DR: In this article, two techniques are used to determine hydrolysis constants (β 1*(M)) of yttrium and the rare earths (YREEs), where β 1 *(M)=[MOH2+][H+][M3+]−1.

TL;DR: In this paper, a possible catalytic cycle involving transformation of CO2 to dimethyl carbonate is postulated based on mechanistic studies at a molecular level, and the catalytic efficiency is remarkably improved using an acetal as the starting material in methanol.

TL;DR: In this article, the first copper complexes from benzilbisthiosemicarbazone (L1H6) and from the cyclic 6-methoxi-1,6-diphenyl-4-thio-3,4,9,10-tetraphenyl, 1,2,5,6,8,11,11-hexaazacyclododeca-7,12-dithione-3.4, 9,10,10-, 10,10)-tetraene (

TL;DR: In this article, the physical properties of MgO powders, obtained from three commercial magnesium compounds, MgSO 4 ·7H 2 O and MgNO 3 ·6H 2O and the mineral dolomite (natural source from Mexico), synthesised by chemical precipitation, are presented.

TL;DR: In this paper, the solid-state structure of 1 has been determined by X-ray crystallography, and it was shown that 1 crystallizes in the triclinic space group P1, with a = 12.773 A, b = 15.326 A, c = 11.641 A, V = 1957.4

TL;DR: In this article, direct synthesis of oxonium derivatives of the dodecahydro-closo-dodecaborate anion is described and the reaction mechanism is discussed.

TL;DR: A tridentate Schiff base ligand (LH) has been synthesized from 2-hydroxyacetophenone and 2-dimethylaminoethylamine as discussed by the authors, which forms the neutral complexes [Co(L)(N3){o-(CH3CO)C6H4O}] (1) and [Co[L)(SCN]·1/2H2O (2) in presence of equivalent amount of Co(II) acetate, and sodium azide for 1 and sodium thiocyanate for 2).

TL;DR: The stability constants and coordination modes of mixed-ligand complexes formed by Cu(II), Ni (II), Zn(II) and Zn (II) were determined in water (25°C, I 0.2 M KCl) by pH-metric, spectrophotometric, EPR and calorimetric methods as discussed by the authors.

TL;DR: In this paper, three Ni(II) complexes with Schiff base ligands derived from salicylaldehyde and diamines with different steric demands were studied by cyclic voltammetry and chronoamperometry in N,N′-dimethylformamide and (CH3)2SO.

TL;DR: Bis(diisobutyldithiophosphinato)cadmium(II) (1) and bis(disobuyldithionato)zinc(II, 2) (2) have been synthesized and their X-ray single crystal structures determined as mentioned in this paper.

TL;DR: In this paper, the appropriateness of various solution and solid state NMR techniques to describe structural aspects of siloxane-oxide hybrid systems prepared by sol-gel processes is discussed.

TL;DR: In this paper, the synthesis and characterisation of four monomeric cis-dioxomolybdenum(VI) complexes involving Schiff base ligands is described, which act as inhibitors in the oxidation of aldehydes by oxygen.

TL;DR: In this article, the preparation, structure and magnetic properties of a series of multilayer copper(II) hydroxy-dicarboxylates were reported, starting from a single-layer copper-II hydroxyacetate.

TL;DR: In this article, the coordination of the Ishexim anions is via the imine nitrogen and thiolato sulfur atoms with evidence for weak interaction of the amide oxygen with the isatin portion of the ligand.

TL;DR: In this paper, the X-ray crystal structures of [Hg(sulfamethoxypyridazinato)2] (2a), [Cd(Sulfadimitriou)2(H2O)] (4b) and [Zn(methoxazolato) 2(py)2.2(h2O)2 (6d) have been determined.

TL;DR: In this article, the formation of tetrameric complexes between oxovanadium(IV) and several pyridinecarboxylic acids was studied in aqueous solution by pH-potentiometric and spectroscopic (electron paramagnetic resonance and electronic absorption) techniques.

TL;DR: In this paper, the potential heptadentate and tetracompartmental ligand N, N ′-bis(3-hydroxysalicylidene)-1,3-diamino-2-propanol (H 5 L) was shown to behave as a di- or tetra-anion in mono-and polynuclear complexes, respectively.

TL;DR: In this article, a structural classification of dimers, containing the Cu(μ-Cl)2Cu core, based on data obtained from X-ray diffraction analysis reported in the literature has been performed.

TL;DR: In this paper, an octahedral geometry around the metal with the Schiff base in the equatorial plane acting as tetradentate and solvent molecules in the axial positions was shown.

TL;DR: In this paper, the copper complex with Schiff bases obtained by condensation of 5-phenylazo salicylaldehyde with di-or tri-amines has been synthesized and characterized by their infrared spectra and elemental analysis.

TL;DR: The reaction of fumaric acid with Mn(CH 3 COO) 2 ·4H 2 O gives the polymeric complex {Mn(fum)} n ( 1 ). Complex 1 reacts with 2,2′-bipyridine in ethanol to yield [Mn (fum)(bipy)(H 2O)] n ( 2 ). Reaction of 1 with 2 equiv.

TL;DR: The chelating properties of 4-(p-methylphenyl)-3,5-bis(pyridin-2-yl)-1,2,4-triazole (MBPT) were investigated through the study of the crystal structures of [Co(MBPT]2(H2O)2](ClO4)2·4 H2O (1), [Ni(MB PT)2 (H 2O) 2 ] and MBPT and the analysis of IR and ESIMS spectra as mentioned in this paper.

TL;DR: In this article, Zn(II), cadmium(II) and mercury (II) coordination compounds derived from tris(2-benzimidazolylmethyl)amine (ntb) were characterised by 1H and 13C NMR in solution, IR and X-ray single crystal diffraction for [Zn(ntb), ZnCl4]2[ZnCl 4]·4EtOH, [Cd(ntc)Cl]2]NO3·2DMSO and [Hg(

TL;DR: In this article, the properties and properties of four new copper(II) complexes of deprotonated aroylhydrazones of 2-pyridine-carboxaldehyde are reported.

TL;DR: The multidentate ligand, 2,6-diacetylpyridine bis(3-hexamethyleneiminylthiosemicarbazone) monohydrate, H22,6Achexim·H2O, crystallizes with one thiosemazone moiety in an intramolecular hydrogen bonded, bifurcated E′ form.

TL;DR: In this article, it was shown that with a sixfold excess of Ph3PO in acetone, the La complex showed a nine-coordinate metal center with four phosphine oxides, two bidentate and one monodentate nitrate groups, and PXRD studies showed the same structure is present in the other three complexes.

TL;DR: In this article, the precursor silylating agent 3-mercaptopropyltrimethoxysilane (mts) was first grafted onto silica gel and then condensed to one molecule of ethylenimine (etn).

TL;DR: A new generation of soluble metallophthalocyanine derivatives (5a, 5b, 6a, 6b, 7b, 8b and 8b·2KSCN) were prepared by cyclotramerization of the newly synthesized dicyano macrocycle (3a, 3b and 4b) in the presence of appropriate metal salts in nonaqueous solvents as mentioned in this paper.

TL;DR: A series of nine new lanthanide(III) complexes of the type [Ln(PBH)2(NO3)2]NO3·xH2O (PBH=2-pyridinecarboxaldehyde benzoylhydrazone) have been prepared and studied by IR, UV-Vis and mass spectra as discussed by the authors.