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- W2007588199 abstract "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. The First Bromide with Trigonal-Bipyramidal [M5(C2)] Clusters: [Pr5(C2)]Br9 The 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." @default.
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- W2007588199 date "1995-09-01" @default.
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- W2007588199 title "Das erste Bromid mit trigonal-bipyramidalen [M5(C2)]-Clustern: [Pr5(C2)]Br9" @default.
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- W2007588199 doi "https://doi.org/10.1002/zaac.19956210905" @default.
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