1,721,027 research outputs found
A NOVEL HETEROCLUSTER WITH D3-SYMMETRY CONTAINING 21 CORE ATOMS - [AS6(III)V15(IV)O42(H2O)]6-
No full textMüller A, DORING J. A NOVEL HETEROCLUSTER WITH D3-SYMMETRY CONTAINING 21 CORE ATOMS - [AS6(III)V15(IV)O42(H2O)]6-. ANGEWANDTE CHEMIE-INTERNATIONAL EDITION IN ENGLISH. 1988;27(12):1721
[V(IV)18O42H9(V(V)O4]6- AND [V(IV)12V(V)6O42(SO4)]8-, 2 NEW SO-CALLED HETEROPOLYANIONS WITH THE SAME CLUSTER-STRUCTURE BUT CONSPICUOUSLY DIFFERENT ELECTRON-POPULATIONS
No full textMüller A, Doring J, Bögge H, Krickemeyer E. [V(IV)18O42H9(V(V)O4]6- AND [V(IV)12V(V)6O42(SO4)]8-, 2 NEW SO-CALLED HETEROPOLYANIONS WITH THE SAME CLUSTER-STRUCTURE BUT CONSPICUOUSLY DIFFERENT ELECTRON-POPULATIONS. CHIMIA. 1988;42(9):300-301
TOPOLOGICALLY INTERESTING CAGES FOR NEGATIVE-IONS WITH EXTREMELY HIGH COORDINATION-NUMBER - AN UNUSUAL PROPERTY OF V-O CLUSTERS
No full textMüller A, Penk M, Rohlfing R, Krickemeyer E, Doring J. TOPOLOGICALLY INTERESTING CAGES FOR NEGATIVE-IONS WITH EXTREMELY HIGH COORDINATION-NUMBER - AN UNUSUAL PROPERTY OF V-O CLUSTERS. ANGEWANDTE CHEMIE-INTERNATIONAL EDITION IN ENGLISH. 1990;29(8):926-927
MAGNETIC-PROPERTIES OF A DODECANUCLEAR POLYOXOVANADATE WITH EXCHANGE AND ELECTRON DELOCALIZATION EFFECTS
No full textBARRA AL, GATTESCHI D, TSUKERBLATT BS, DORING J, Müller A, BRUNEL LC. MAGNETIC-PROPERTIES OF A DODECANUCLEAR POLYOXOVANADATE WITH EXCHANGE AND ELECTRON DELOCALIZATION EFFECTS. INORGANIC CHEMISTRY. 1992;31(24):5132-5134
[H6AS10MO24O90]8-, A HETEROPOLYANION COMPRISING 2 LINKED SPHERICAL FRAGMENTS, AND REDUCED KEGGIN ANIONS AS ITS DEGRADATION PRODUCTS
No full textMüller A, Krickemeyer E, PENK M, WITTNEBEN V, DORING J. [H6AS10MO24O90]8-, A HETEROPOLYANION COMPRISING 2 LINKED SPHERICAL FRAGMENTS, AND REDUCED KEGGIN ANIONS AS ITS DEGRADATION PRODUCTS. ANGEWANDTE CHEMIE-INTERNATIONAL EDITION IN ENGLISH. 1990;29(1):88-90
VANADIUM(IV) AND MIXED-VALENCE VANADIUM(IV/V) OXYGEN CLUSTERS WITH NOVEL ELECTRONIC-PROPERTIES, INCLUDING THE EXAMPLES [V12AS8O40(HCO2)]N- (N = 3 OR 5)
No full textMüller A, Doring J, Bögge H. VANADIUM(IV) AND MIXED-VALENCE VANADIUM(IV/V) OXYGEN CLUSTERS WITH NOVEL ELECTRONIC-PROPERTIES, INCLUDING THE EXAMPLES [V12AS8O40(HCO2)]N- (N = 3 OR 5). JOURNAL OF THE CHEMICAL SOCIETY-CHEMICAL COMMUNICATIONS. 1991;(5):273-274.The mixed valence compounds [NHEt3]2[NH2Me2][V12As8O40(HCO2)].2H2O 1 and Na5[V12As8O40(HCO2)].18H2O 2 containing isostructual V-O clusters with encapsulated formate ions and different electron populations, and their characterization are reported; in structurally related V-O clusters spin-spin coupling increases with increasing numbers of V(iv) centres in a nearly continuous way
[H3KV12AS3O39(ASO4)]6- AND RELATED TOPOLOGICAL AND OR STRUCTURAL ASPECTS OF POLYOXOMETALATE CHEMISTRY
No full textMüller A, PENK M, DORING J. [H3KV12AS3O39(ASO4)]6- AND RELATED TOPOLOGICAL AND OR STRUCTURAL ASPECTS OF POLYOXOMETALATE CHEMISTRY. INORGANIC CHEMISTRY. 1991;30(26):4935-4939.On reduction of an aqueous solution of vanadate(V) with thiocyanide in the presence of As(V), the black-gray mixed-valence compound K6[H3KV12As3O39(AsO4)].8H2O (1) is formed. It crystallizes in the space group C2/c with a = 39.993 (15) angstrom, b = 13.467 (4) angstrom, c = 18.209 (6) angstrom, beta = 111.52 (3)-degrees, and Z = 8. Refinement of 686 variables with 8827 observed reflections yields R = 0.049 and R(w) = 0.058. The compound contains an anion with approximate C3 symmetry, which can be described as a fragment of a sphere capped with a potassium ion. The oxygen and/or metal atoms of polyoxometalates often span the vertices of topologically and/or geometrically interesting polyhedra. Related aspects of 1 are discussed
FORMATION OF A CLUSTER SHEATH AROUND A CENTRAL CLUSTER BY A SELF-ORGANIZATION PROCESS - THE MIXED-VALENCE POLYOXOVANADATE [V34O82]10-
No full textMüller A, Rohlfing R, Doring J, Penk M. FORMATION OF A CLUSTER SHEATH AROUND A CENTRAL CLUSTER BY A SELF-ORGANIZATION PROCESS - THE MIXED-VALENCE POLYOXOVANADATE [V34O82]10-. ANGEWANDTE CHEMIE-INTERNATIONAL EDITION IN ENGLISH. 1991;30(5):588-590.An ellipsoid shell consisting of 30 linked tetragonal VO5 pyramids surrounding a distorted {V4O4}O4 cube-this is one way to describe the title compound (right:solid circles, V; empty circles, O). This cluster is not only of topological interest, however. Its magnetic properties make it a molecular model of the monoclinic and the tetragonal VO2 phase. If the cluster structure is roughly regarded as a cubic close packing of oxygen atoms with vanadium atoms occupying the octahedral holes, then its relationship to the solid is clear
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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