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Showing papers in "Polyhedron in 1984"


Journal ArticleDOI
TL;DR: In this paper, a general introduction to cyclometallated species is presented, followed by the synthesis of cyclometalated species and a mechanistic analysis of the resulting species.

191 citations


Journal ArticleDOI
TL;DR: Etude de la double liaison dans des composes tels que: les disilenes, diphosphenes, digermenes, distannenes, phosphaarsenes, diarsenes as discussed by the authors, a partir des spectres IR, RMN, electroniques and des calculs d'orbitales moleculaires

170 citations


Journal ArticleDOI
TL;DR: In this article, a method for constructing qualitatively the molecular orbitals of an approximately spherical cluster of boron or transition-metal atoms is described, which gives a way of understanding the electron-counting rules for such clusters, the preference for deltahedral structures, the relationship between closo boranes on the one hand and nido and arachno borane on the other, and Mingos' capping and condensation principles for transition metal clusters.

90 citations


Journal ArticleDOI
TL;DR: In this article, the properties of five and six-coordinated di and tri-n-butyl tin(IV) semi-and thio-semi carbazates have been characterized by IR, NMR, and Mass spectroscopy.

76 citations


Journal ArticleDOI
TL;DR: In this paper, a trigonal pyramidal coordinated PbS3 unit was solved using data collected at approx. − 160°C and refined to conventional R values of 5.7 and 4.6%, respectively for 1 and 2.

71 citations


Journal ArticleDOI
TL;DR: In this article, new complexes of lanthanide nitrates with 4N-(2′-hydroxy benzylidene)-aminoantipyrine (HBAAP) having the general formula [Ln(HBAPA) 2 (NO 3 ) 3 ] (where Ln = La, Pr, Nd, Sm, Gd, Tb, Dy, Ho and Y) have been prepared and characterized.

71 citations


Journal ArticleDOI
TL;DR: In this article, a flexible bonding model for high nuclearity gold cluster compounds was developed, which emphasises the topologies of the clusters rather than their detailed geometries, and the observed stereochemical non-rigidity of these compounds in solution was readily accounted for.

65 citations


Journal ArticleDOI
TL;DR: In this paper, detailed spectroscopic and scattering investigations of isopoly-molybdate and -tungstate solutions as a function of concentration and pH were made, and the apparent molecular weights were determined as the function of time and concentration.

58 citations


Journal ArticleDOI
TL;DR: The structures of dicyclohexyl-(18-crown-6) uranyl perchlorate, [(C20H36O6)UO2] (ClO4)2 (complex I) and of DICYCLOHENYL-(18crown 6)-URYXPERCHICATE (complex II) have been determined from three-dimensional X-ray diffraction data as discussed by the authors.

54 citations


Journal ArticleDOI
TL;DR: In this article, the crystal structure of the zinc derivative has been determined from diffractometer data to R = 0.072 for 1086 independent reflections, with unit-cell dimensions a = 18.193(2), b = 24.532(6), c = 11.535(2) A,β = 103.71(1)° and Z = 8.26(1).

51 citations


Journal ArticleDOI
TL;DR: In this paper, several monometallic complexes (bipym)PtR 2 and bimetallic analogues R 2 Pt(μ-bipyramid) PtR′ 2 [R = R′ = CH 3, C 6 H 5, adme; R = R

Journal ArticleDOI
TL;DR: A series of Cu(II) complexes of the thiosemicarbazone, 3-azabicyclo[3.2]-nonene-3-thiocarboxylic acid 2-[1-(2-pyridinyl)ethylidene]hydrazide(HL) and the corresponding N-oxide (HLO) have been prepared and characterized as discussed by the authors.

Journal ArticleDOI
TL;DR: In this article, anisaldehyde thiosemicarbazone (PAT) has been used to isolate the complex compounds of the general formula [M(PAT),X 2 ]H 2 O where M(II) = Zn, Hg, Cd and Cu, and X = Cl or 1 2 SO 4.


Journal ArticleDOI
TL;DR: In this article, the molecular cage of Cu5(μ-SBut)6 has been shown to have a trigonal bipyramido-Cu5-trigonal antiprismo-S6 structure.

Journal ArticleDOI
TL;DR: In this article, the synthesis and characterization of a number of cis-dioxomolybdenum(VI) coordination complexes involving tridentate (ONS) ligands is described.

Journal ArticleDOI
TL;DR: The crystal and molecular structures of the title compound have been determined by single crystal X-ray diffraction methods as mentioned in this paper, and the spiro molecule has a geometry very close to tetrahedral, with OTi-O angles of 107.9-111.0(2)° and very short Ti-O bonds of length 1.777-1.791(5)A.

Journal ArticleDOI
TL;DR: In this article, the authors considered whether satisfactory localized 2-and 3-centre bond schemes may be devized for real or hypothetical clusters BnHnc− (c = 0, 2 or 4; n = 4 → 12) or isoelectronic analogues thereof, with closo deltahedral shapes.

Journal ArticleDOI
TL;DR: In this paper, a trigonal-bipyramidal structure for the [Cu(ONS)dipy] and (Cu(ONs)phen] complexes was proposed.

Journal ArticleDOI
TL;DR: In this paper, the structure of Ni6(MPDMAH) (ClO4) 12 was characterized using a cyclic hexanuclear array of nickel atoms linked by sulphur bridging ligands.

Journal ArticleDOI
TL;DR: In the case of peroxo ligands, the difference in MoNapex and MoNeq bond distances (2.312(5 and 2.199(5)A) is similar to that in the CrNeq and CrNeq distances ( 2.23(2), 2.11(2)A), which is indicative of greater negative charge on the O2 ligands and approaching that of O2−2 in the molybdenum complex.

Journal ArticleDOI
TL;DR: In this paper, a halogen-bridged dimeric structure is proposed for the cobalt(III) complex of the Schiff base, which is paramagnetic with a magnetic moment of 1.73 B.M.

Journal ArticleDOI
TL;DR: In this article, the synthesis of 1,4-dimethyl-2,3,5,6-tetra-n -alkyl-1,4diboracyclohexa-2.5-dienes from the reaction of di-n-alkylacetylenes with the methylborylene-generating system 2C 8 K/MeBBr 2 is described.

Journal ArticleDOI
TL;DR: In this paper, the structures of the [Mo6(μ3-Cl)8(OMe)6]2− anions have been determined and reveal interesting comparisons of MM and MO distances with related Mo6(m3-X)84+ containing compounds and polynuclear alkoxides of molybdenum.

Journal ArticleDOI
TL;DR: In this article, a dodecamolybdo-heteropolyanion (HPA) was shown to function catalytically in the presence of aqueous hydrogen peroxide.

Journal ArticleDOI
TL;DR: In this paper, the structural stability index defined as the number of loops per MO6 octahedral unit, the relative stability, the degree of condensation, the interconversion, and the formation of heteropoly blue anions of HPA and IPA can be clarified.

Journal ArticleDOI
TL;DR: In this paper, the covalent derivatives [Et2M-PEt2]3 (M = Ga, In) have been prepared from Lewis acid-base complexes, R3M.

Journal ArticleDOI
TL;DR: In this article, the structure of the hexanuclear metal species was established by X-ray diffraction and the main feature is a near-planar array of metal atoms with a central triangle of platinum atoms [PtPt (mean), 2.703(3) A] each edge-bridged by an iridium atom.

Journal ArticleDOI
TL;DR: Several complexes of 5,8-diethyl-7-hydroxy-6-dodecanone oxime [H 2 L] with Cu(II) and Ni (II) have been synthesized and characterized by means of a number of techniques including elemental analysis, IR spectra, magnetic susceptibility measurements, electronic absorption spectra and NMR spectra as discussed by the authors.

Journal ArticleDOI
TL;DR: In this article, the title compound (abbreviated as MPzATSH) has been synthesised and physico-chemically (IR, PMR and mass spectrum) characterised for the first time.