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  • 1
    ISSN: 0044-2313
    Keywords: Tetragold Cobalt Cluster ; Synthesis ; Crystal Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cluster Synthesis by Photolysis of R3PAuN3. V. Synthesis and Structure of [(Ph3PAu)4Co(CO)3]PF6. Bonding in Clusters [(Ph3PAu)xM(CO)y]+[(Ph3PAu)4Co(CO)3]+ (1) is formed by photolysis of Ph3PAu—Co(CO)4 and subsequent addition of Ph3PAu+ to the photolysis product. It crystallizes as 1 · PF6 in the triclinic space group P1 with a = 1646,7(6), b = 1915,3(3), c = 1288,0(7) pm, α = 91,35(3), β = 112,02(3), γ = 74,42(2)°; Z = 2. The inner skeleton of the cluster has the form of a trigonal bipyramid with the Co atom in equatorial position and distances Co—Au between 258 and 265 pm. The distances Au—Au range from 278 to 293 pm. The structure and bonding of 1 and related transition metal-gold clusters [(R3PAu)xM(CO)y]+ are discussed.
    Notes: [(Ph3PAu)4Co(CO)3]+ (1) entsteht durch Photolyse von Ph3PAu—Co(CO)4 und anschließende Zugabe von Ph3PAu+ zum Photolyseprodukt. Es kristallisiert als 1 · PF6 in der triklinen Raumgruppe P1 mit a = 1646,7(6), b = 1915,3(3), c = 1288,0(7) pm, α = 91,35(3), β = 112,02(3), γ = 74,42(2)°; Z = 2. Das innere Clustergerüst Au4Co bildet eine trigonale Bipyramide mit dem Co-Atom in äquatorialer Position und Au—Co-Abständen zwischen 258 und 265 pm, sowie Au—Au-Abständen zwischen 278 und 293 pm. Struktur und Bindungsverhältnisse von 1 und verwandten Übergangsmetall-Gold-Clustern [(R3PAu)xM(CO)y]+ werden diskutiert.
    Additional Material: 5 Ill.
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  • 2
    ISSN: 0044-2313
    Keywords: Pentagold molybdenum cluster ; trigold cobalt cluster ; [(Ph3PAu)5Mo(CO)4]PF6 ; (Ph3PAu)3Co(CO)3 ; synthesis ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cluster Synthesis by Photolysis of R3PAuN3. VIII. Synthesis and Crystal Structure of [(Ph3PAu)5Mo(CO)4]PF6 · CH2Cl2 and (Ph3PAu)3Co(CO)3Photolysis of a mixture of Ph2PAuN3 and Mo(CO)6 in THF yields [(Ph3PAu)5Mo(CO)4]+ (1), which can be crystallized from CH2Cl2/diisopropylether as orange 1 · PF6 · CH2Cl2 with the space group P21/c and a = 1681.4(5), b = 2215.6(12), c = 2761.5(9) pm, β = 91.54(3)°, Z = 4. The Au5Mo center of cluster 1 forms a capped trigonal bipyramid with the Mo atom in equatorial position and almost equal Mo—Au distances between 279.9(5) and 284.6(7) pm to all five Au atoms. The Au—Au distances range from 272.2(4) to 301.3(4) pm. The Mo(CO)4 group causes three v(C0) at 1975, 1915 and 1890cm-1. Reaction of Ph3PAuCo(CO)4 with Ph3PAuPF6 affords the known cluster cation [(Ph3PAu)4Co(CO)3]+ in high yield. It can be degraded with C1- to the neutral cluster (Ph3PAu)3Co(CO)3 (2). 2 forms air stable, yellow crystals with the space group P21/n and a = 1359.4(4), b = 2041.0(5), c = 1853.2(6)pm, β = 91.47(1)°, Z = 4. The Au3Co core of 2 has a tetrahedral structure with distances Co—Au between 250.4(1) and 254.0(2) pm and Au—Au between 279.5(1) and 285.1(1) pm. v(C0) are observed at 1963, 1905 and 1891 cm-1. Reaction of 2 with [(Ph3PAu)4Co(CO)3]+ yields the condensed cluster [(Ph3PAu)6AuCo2(CO)6]+.
    Notes: Die Photolyse einer Mischung von Ph3PAuN3 und Mo(CO)6 in THF ergibt den Cluster [(Ph3PAu)5Mo(CO)4]+ (l), der nach Zugabe von PF6- aus CH2Cl2/Diisopropylether als oranges 1 · PF6 · CH2Cl2 mit der Raumgruppe P21/c und a = 1681,4(5), b = 2215,6(12), c = 2761,5(9) pm, β = 91,54(3)°, Z = 4 kristallisiert. Das Au5Mo - Gerüst von 1 bildet eine einfach überkappte trigonale Bipyramide mit dem Mo - Atom in äquatorialer Position und nahezu gleich langen Mo—Au-Abständen von 279,9(5) bis 284,6(7) pm zu allen fünf Au-Atomen. Die Au—Au-Abstände liegen zwischen 272,2(4) und 301,3(4) pm. Die Valenzschwingungen v(Co) der Mo(CO)4-Gruppe werden bei 1975, 1915 und 1890cm-1 beobachtet. Reaktion von Ph3PAuCo(CO)4 mit Ph3PAuPF6 liefert das bereits bekannte Clusterkation [(Ph3PAu)4C(CO)3]+ in hoher Ausbeute. Es kann durch Umsetzung mit Cl- zum Neutralcluster (Ph3PAu)3Co(CO)3 (2) abgebaut werden. 2 bildet luftstabile, gelbe Kristalle rnit der Raumgruppe P21/n und a = 1359,4(4), b = 2041,0(5), c = 1853,2(6)pm, β = 91,47(1)°, Z = 4. Das Au3Co-Gerüst weist eine tetraedrische Struktur mit Abständen Co—Au zwischen 250,4(1) und 254,0(2) pm und Au—Au zwischen 279,5(1) pm und 285,1(1) pm auf. v(CO) treten bei 1963, 1905 und 1891 cm-1 auf. Reaktion von 2 mit [(Ph3PAu)4Co(CO)3]+ führt unter Clusterkondensation zu [(Ph3PAu)6AuCo2(CO)6]+.
    Additional Material: 2 Ill.
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