First Characterization of an Extended Ammonium-Ammonia Complex 1∞ [{NH4(NH3)4}+ (μ-NH3)2] in the Crystal Structure of [NH4(NH3)4] [Co(C2B9H11)2] ×2NH3.

✍ Scribed by Thomas Rossmeier; Nikolaus Korber

• Publisher: John Wiley and Sons
• Year: 2005
• Weight: 12 KB
• Volume: 36
• Category: Article
• ISSN: 0931-7597
• DOI: 10.1002/chin.200511014

✦ Synopsis

Structure D 2000

First Characterization of an Extended Ammonium-Ammonia Complex 1 ∞ [{NH4(NH3)4} + (µ-NH3)2] in the Crystal Structure of [NH4(NH3)4][Co(C2B9H11)2]•2NH3. -The title compound is prepared by reaction of Na[Co(C2B9H11)2] with a proton-charged ion exchange resin in liq. NH3 (Amberlyst 15, 195 K; ≈100% yield). [NH4(NH3)4][Co(C2B9H11)2]•2NH3 crystallizes in the orthorhombic space group P2 1 2 1 2 1 with Z = 4 (low temp. single crystal XRD). The anionic part of the structure consists of [Co(C2B9H11)2] -complexes, which are connected via C--H•••H-B dihydrogen bonds. Furthermore, the compound contains an infinite 1 ∞ [{NH4(NH3)4} + (µ-NH3)2] cationic chain, which is formed by [NH4(NH3)4] + ions linked by two ammonia molecules. The N-H•••N hydrogen bonds range from 1.92 to 2.71 Å. -(ROSSMEIER, T.; KORBER*, N.; Z.