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- W2012534466 abstract "The mixed halogenohexaborates B 6 X n Y 6-n 2- , n = 1-5; Χ ≠ Υ = Cl, Br, I, including most of the pure stereoisomers for n = 2—4, are prepared for the first time by treatment of the halohydrohexaborates B 6 X n H 6-n 2- , X = Cl, Br in aqueous alkaline solution with bromine and iodine or with halogenosuccinimides. The point symmetry is determined from the B NMR spectra, which show characteristic features for homologous isostructural compounds. In the systems B 6 X n Y 6-n 2- a considerable dispersion of the 11 B signals is observed, for B(X) atoms to lower, for B(Y) atoms to higher field compared with B 6 X 6 2- and B 6 Y 6 2- (electronegativity X > Y), respectively. An additional chemical shift is caused by the mutual antipodal effect between pairs of opposite B atoms carrying different substituents. From the systematic influences on the chemical shifts the 11 B NMR spectra of the missing species fac-B 6 X 3 Y 3 2- are calculated." @default.
- W2012534466 created "2016-06-24" @default.
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- W2012534466 date "1990-08-01" @default.
- W2012534466 modified "2023-09-26" @default.
- W2012534466 title "Darstellung und <sup>11</sup>B-NMR-Spektren perhalogenierter closo-Hexaborate Β<sub>6</sub>Χ<sub>n</sub>Y<sub>6-n</sub> <sup>2-</sup>, n=0-6; X ≠ Y= Cl, Br, I / Preparation and <sup>11</sup>B NMR Spectra of the Perhalogenated closo-Hexaborates B<sub>6</sub>X<sub>n</sub>Y<sub>6-n</sub> <sup>2-</sup>,n = 0-6; Χ ≠ Υ = Cl, Br, I" @default.
- W2012534466 doi "https://doi.org/10.1515/znb-1990-0801" @default.
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