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- W121459672 abstract "Pr8Cl7B7 is prepared from stoichiometric mixtures of PrCl33, Pr and B at 1220 K in closed Ta capsules. Pr8Cl7B7 forms golden coloured needles sensitive to moist air. It crystallizes in the space group P1 with a = 773.1(2) pm, b = 903.0(2) pm, c = 1419.4(3) pm, a = 81.55(3)°, β = 82.18(3)°, and γ = 64.76(3)°. In the crystal structure Pr6 trigonal prisms are condensed to double chains which run parallel [100]. Some of the prisms and rectangular prism faces are centered by boron atoms which leads to B3, B6, B8 rings, and B2 dumbbells condensed into ribbons. These Pr8B7 strands are surrounded and held together by the Cl atoms. Pr8Cl7B7 is a metallic conductor and shows Curie Weiss behavior with μeff = 3.48 μB. According to extended Hückel calculations, the distribution of valence electrons is best described by a formulation Pr818+Cl77−B711−. Bonding within the boron ribbons is thus nearly optimal, while the average 4f2 5d3/4 configuration of Pr accounts for both the observed magnetic moment and metallic conductivity." @default.
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- W121459672 date "1999-10-01" @default.
- W121459672 modified "2023-10-16" @default.
- W121459672 title "Pr8Cl7B7: preparation, structure, bonding, properties" @default.
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- W121459672 doi "https://doi.org/10.1016/s1293-2558(00)80103-x" @default.
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