English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The cesium dodecahydro-monocarba- closo- dodecaborate Cs[CB 11 H 12 ] crystallizes with an unexpected trigonal crystal structure having the lattice parameters  a  = 2094.73(3) and  c  = 1324.56(2) pm ( c/a  = 0.632) for  Z  = 18. The non-centrosymmetric space group  R 3 allows an ordering of the unsymmetric [CB 11 H 12 ] –  anions in a way that the least electronegative vertices of the  pseudo- icosahedral cages avoid close proximity to the Cs +  cations. Hence there are channels at [0 0  z ], [ 1 / 3  2 / 3  z ] and [ 2 / 3  1 / 3  z ], into which the C–H bonds of the [CB 11 H 12 ] –  units are pointing. There are two crystallographically independent Cs +  cations and [CB 11 H 12 ] –  anions present with unsurprising interatomic distances ( d (C–B) = 166–181 pm,  d (B–B) = 170–183 pm,  d (B–H) =  d (C–H) ≈ 110 pm) for the latter. Both Cs +  cations have contact to 18 hydrogen atoms ( d (Cs–H) = 296–427 pm) stemming from six unevenly face-grafting [CB 11 H 12 ] –  anions, where only B–H bonds are involved. This fact is nicely reflected by IR and Raman spectroscopy. According to a 6/6 motif of the ions with highly distorted mutual octahedral coordination spheres of their centres of gravity, the crystal structure of Cs[CB 11 H 12 ] follows roughly a rock salt-like arrangement. This becomes even more evident, when order-disorder transitions starting at  T  = 60 °C lead to more highly symmetrical structures with orientationally disordered [CB 11 H 12 ] –  anions.

Die unerwartete Kristallstruktur des Cäsium-Dodekahydro-Monocarba- closo- Dodekaborats Cs[CB 11 H 12 ]