ChemInform Abstract: Undecaborates M2[B11H11]: Facile Synthesis, Crystal Structure, and Reactions.

✍ Scribed by O. Volkov; W. Dirk; U. Englert; P. Paetzold

• Publisher: John Wiley and Sons
• Year: 2010
• Weight: 39 KB
• Volume: 30
• Category: Article
• ISSN: 0931-7597
• DOI: 10.1002/chin.199937020

✦ Synopsis

Undecaborates M 2 [B 11 H 11 ]: Facile Synthesis, Crystal Structure, and Reactions. -Crystal structure analysis of (III) (space group P2 1 /c, Z = 4) reveals a rather distorted octahedron for the [B 11 H 11 ] 2-anion, whereas the corresponding octahedron in (VIIb) (space group ) exhibits a structure close to C 2c symmetry. Protonation of the [B 11 H 11 ] 2-anion at low temp. gives [B 11 H 12 ] -, which is apparently formed by opening of the B1-B4 edge in the course of the known degenerate skeletal rearrangement (NMR), followed by protonation of this edge. Addition of BH 3 to [B 11 H 11 ] 2-yields closo-[B 12 H 12 ] 2-under loss of H 2 . Fusion of two [B 11 H 11 ] 2-units with the aid of FeCl 3 produces the known [B 22 H 22 ] 2-anion, whose 11 B NMR signals could completely assigned on the basis of Cs symmetry. [Et 3 BnN][(Ph 3 P) 2 N] [B 22 H 22 ] crystallizes in the space group Pna2 1 with Z = 4. -(VOLKOV, O.;