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  • Halides  (2)
  • Wiley-Blackwell  (2)
  • American Chemical Society
  • American Institute of Physics (AIP)
  • 1995-1999  (2)
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  • 1945-1949
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  • 1995  (2)
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  • Wiley-Blackwell  (2)
  • American Chemical Society
  • American Institute of Physics (AIP)
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  • 1995-1999  (2)
  • 1950-1954
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 1466-1470 
    ISSN: 0044-2313
    Keywords: Synthesis ; Crystal structure ; Halides ; Clusters ; Lanthanides ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The First Bromide with Trigonal-Bipyramidal [M5(C2)] Clusters: [Pr5(C2)]Br9The bromide [Pr5(C2)]Br9 is obtained via metallothermic reduction of PrBr3 with rubidium in the presence of praseodymium and carbon in a sealed niobium container at 730°C as dark red single crystals. [Pr5(C2)]Br9 crystallizes in the monoclinic crystal system [P21/n; Z = 4; a = 1 006.9(1); b = 1 886.1(1); c = 1 045.9(1) pm; β = 108.130(1)°; Rint = 0.059; R1 = 0.038; wR2 = 0.077]. One edge in the base of the trigonal bipyramid in [Pr5(C2)]Br9 is usually long (440 pm). It is not brigded by a Bri ligand. In addition to the eight Bri, the cluster is coordinated by 12 terminal ligands (Bra). Except for the known Bra-a-a and Bri-a connections, Bri-a-a brigdes are observed for the first time for trigonal-bipyramidal clusters.
    Notes: Das Bromid [Pr5(C2)]Br9 erhält man durch metallothermische Reduktion von PrBr3 mit Rubidium in Gegenwart von Praseodym und Kohlenstoff in einer verschweißten Niobampulle bei 730°C in Form dunkelroter Kristalle. [Pr5(C2)]Br9 kristallisiert im monoklinen Kristallsystem [P21/n; Z = 4; a = 1 006,9(1); b = 1 886,1(1); c = 1 045,9(1) pm; β = 108,130(1)°; Rint = 0,059; R1 = 0,038; wR2 = 0,077]. Eine Kante in der Basis der trigonalen Bipyramide in [Pr5(C2)]Br9 ist mit 440 pm ungewöhnlich lang und wird nicht von einem Bri-Liganden überbrückt. Zusätzlich zu den acht Bri werden die Cluster von 12 terminalen Liganden koordiniert (Bra). Neben den bekannten Bra-a-a- und Bri-a-Brücken treten hier erstmals bei trigonal-bipyramidalen Clustern Bri-a-a-Brücken auf.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 1299-1303 
    ISSN: 0044-2313
    Keywords: Synthesis ; Crystal Structure ; Halides ; Clusters ; Lanthanides ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ternary Chlorides with Trigonal-Bipyramidal Clusters: [M5(C2)]Cl9 (M = La—Pr)The chlorides [M5(C2)]Cl9 (M = La—Pr) are obtained by metallothermic reduction of the respective trichlorides MCl3 with caesium in the presence of the lanthanide metal and carbon in sealed niobium ampoules at 800°C. They contain trigonal-bipyramidal clusters [M5(C2)] crystallizing with the triclinic crystal system. Only seven of the nine edges of the trigonal bipyramids are brigded by chloride (Cli). Each cluster is surrounded by twelve terminal ligands (Cla) so that units of the composition [M5(C2)Cl7i]Cl12a have to be considered. These are connected not only via Cli-a and Cla-a-a bridges. Rather, Cla-a (one linear and one bent) and Cli-i bridges are also observed.
    Notes: Die Chloride [M5(C2)]Cl9 (M = La—Pr) erhält man durch metallothermische Reduktion der entsprechenden Trichloride MCl3 mit Caesium in Gegenwart des jeweiligen Metalls M und Kohlenstoff in verschweißten Niobampullen bei 800°C. Sie enthalten trigonal-bipyramidale [M5(C2)]-Cluster und kristallisieren im triklinen Kristallsystem. Von den neun Kanten der trigonalen Bipyramiden werden nur sieben von Cli-Liganden überbrückt. Zusätzlich werden die [M5(C2)]-Cluster von zwölf terminalen Liganden koordiniert, so daß man zu Einheiten [M5(C2)Cl7i]Cl12a gelangt. Die trigonal-bipyramidalen Cluster werden über Cli-a- und Cla-a-a-Brücken, auch über Cla-a-Brücken (eine gewinkelte und eine lineare) sowie Cli-i-Brücken miteinander vernetzt.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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