Showing papers in "Polyhedron in 1991"

TL;DR: In this paper, single-crystal X-ray diffraction studies revealed for M = K or Rb that [MOBut·ButOH]∞ crystallizes from tetrahydrofuran-n-pentane at −20°C in the triclinic space group P 1, with unit cell dimensions [K, Rb]: a = 9.862(3), 9.929(4, 9.4, 172.61°) with the hydrogen atom closer to O(7) (1.22, 1.18

TL;DR: In this paper, the authors investigated various routes to bismuth(III) alkoxides and β-diketonate derivatives and showed that the thermal stability of the volatile precursors 1 and 2 is in favour of the alkoxide, while the high solubility of 2 is attractive for sol-gel purposes.

TL;DR: In this paper, the general status of catalytic dehydrocoupling as a method for the synthesis of element-element bonds is discussed and evaluated in the context of studies carried out in the authors' and other laboratories.

TL;DR: In this article, a tetrameric molecular species of Al[(μ-OiPr)2Al(OiP)2]3, consistent with earlier proposals and spectroscopic data, has been shown by X-ray diffraction, in the form of a crystalline solid of melting point 127°C.

TL;DR: In this article, the authors summarized recent theoretical and experimental studies of the compounds whose skeletons are made of the heavier Group 14 elements and discussed the applicability of the concepts such as aromaticity, strain and bonding established in carbon chemistry.

TL;DR: In this paper, the existence of (1:1) bimetallic complexes in alcohol solutions has been proved by conductometric titration curves of MO(OR)4, and MO2 (OR)2 (M = Mo, W; R = Et, iPr, C2H4OMe) by sodium (or lithium) alkoxides.

TL;DR: In this article, the tertiary alkoxides of yttrium and lanthanum have been prepared by adding excess tertiary alcohol to the metal tris-(bistrimethylsilylamides), M{N(SiMe3)2}3 (M = Y, La), and characterized by elemental analyses, NMR, IR and mass spectroscopy.

TL;DR: In this article, the coordination of the copper center is best described as 3+1 with an asymmetrically coordinated 1,5-COD ligand where the Cu:C(6):C (7) centroid and Cu ǫ:C((10)):C(11) Ã 0 centroid distances are 1.953 and 2.418 A, respectively.

TL;DR: In this article, the authors performed all-electron SCF-CI calculations with several basis sets for excited singlet states of the linear oligosilanes SinH2n+2, n = 2-5, in order to establish their nature as a function of chain length.

TL;DR: In this paper, a nuclear copper(II) complexes of ligands derived from condensation of 2,6-diformyl-4-methylphenol with various aromatic mono-and diamines have been synthesized.

TL;DR: In this paper, the white crystalline compound WO2Cl2(dme) was determined by X-ray diffraction and its structure was built up of discrete molecules with a distorted octahedral geometry, the tungsten atom coordinates two oxygens in cis positions.

TL;DR: In this paper, the reaction between neodymium chips and isopropanol (Pri) led to the isolation of an oxoisopropoxide solvate Nd5(OPri)13(PriOH)2, which has been characterized by microanalysts and IR spectroscopy, as well as by X-ray diffraction.

TL;DR: In this paper, the structure of the Ni(mpo)2 was determined by X-ray diffraction, where the nickel atom is in a square planar environment of two mpo− ligands in the cis configuration.

TL;DR: Amine oxide-assisted decarbonylation of Re2(CO)10 in the presence of 1,1′-bis(diphenylphosphino)ferrocene (dppf) produces, under different conditions, [Re2(C)9]2 (μ-dppF) (1), Re2C9(1-dFP) (5) and its oxidation product Re2CO)9( 1-dPPFO) (7), which undergoes an oxidative bridge-scission with Me3NO to give

TL;DR: A series of five complexes of tin(IV) with 5,10,15,20-tetraphenylporphyrin (H2tpp) of the type [SnX2(tpp)] has been prepared and characterized using NMR and single crystal X-ray diffraction techniques as mentioned in this paper.

TL;DR: In this paper, the interaction of solid W3S7Br4 with Et4NBr under vibrational mill conditions followed by extraction with acetonitrile has been studied.

TL;DR: In this paper, the reactions of the η2 -disilene complexes Cp2M(η 2-Me2SiSiMe2) (M = Mo, 1a; W, 1b) with a variety of inorganic and organic substrates are reported.

TL;DR: The spontaneous assembly of a binuclear double helical complex is probably associated with the close stacking contacts between approximately co-planar pyridine rings; there are no direct metal-metal interactions as discussed by the authors.

TL;DR: In this paper, the caracterisation structurale de derives complexes of l'aluminium is discussed. But this paper is restricted to the case of the chimie and derives complexes.

TL;DR: In this article, the vibrational, 1H and 13C NMR spectra of the ZnS2N4 core have been analyzed for the pyridine-2-thionato complex M(pyt)2.

TL;DR: In this article, LiORn, [LiOR]n, R = But (1) and PhMe2C (2) were fully characterized in solution by IR, 1H, 13C and 7Li NMR, and cryoscopy in benzene.

TL;DR: In this article, the ultrasound-promoted reaction of dichlorodimethylgermane with lithium in the presence of substituted 1,3-dienes results in the formation of the corresponding germacyclopent-3-enes in good yields.

TL;DR: In this paper, various routes to lead(II) alkoxides using PbCl2, Pb(OAC)2 and Pb[N(SiMe3)2]2 as starting materials have been explored.

TL;DR: In this article, a serie of complexes aryl de metaux de transition and lanthanides are presented. Synthese bibliographique, reactivite et structure d'une serie de complexes.

TL;DR: The synthesis and characterization of a number of cadmium complexes with sulphur-containing ligands including: 2-mercaptopyridine, 2mercaptobenzothiazole, 2- mercaptothiazoline, 1,4,8,11-tetrathiaundecane, 5mercapto-1 -methyltetrazole and dithiocarbamates are reported as discussed by the authors.

TL;DR: The germanium and tin divalent amide M(NR2)2 (R = SiMe3, M = Ge or Sn) readily reacts with a chalcogen (E) or MeOOCCCCOOMe to yield the appropriate metal(IV) oxidative addition product [M(NR 2)2(μ-E)] n (E = S, Se or Te) (1-6) or (7), respectively as discussed by the authors.

TL;DR: In this paper, the structures of Group IV [1.1]propellanes were determined using ab initio all-electron and effective core potential methods, and the bonding in these systems was examined using the theory of atoms in molecules and localized molecular orbital analysis.

TL;DR: In this paper, the reaction between barium and triethanolamine in toluene/THF affords, after recrystallization in ethanol, the barium alkoxide [N(C2H4O)(C 2H4OH2]2Ba·2EtOH, which has been characterized by X-ray crystallography.