1333217-89-2Relevant academic research and scientific papers
Site-selective functionalization of Si6R6 siliconoids
Heider, Yannic,Poitiers, Nadine E.,Willmes, Philipp,Leszczyńska, Kinga I.,Huch, Volker,Scheschkewitz, David
, p. 4523 - 4530 (2019)
The recent progress in the synthesis of partially substituted neutral silicon clusters (siliconoids) revealed unique structures and electronic anisotropies that are reminiscent of bulk and nano surfaces of silicon. Here, we report the selective 2-lithiati
Contraction and expansion of the silicon scaffold of stable Si 6R6 isomers
Abersfelder, Kai,Scheschkewitz, David,Russell, Adam,Rzepa, Henry S.,White, Andrew J. P.,Haycock, Peter R.
, p. 16008 - 16016,9 (2020/08/24)
The reactivity of two stable Si6R6 clusters (4 and 5, R = 2,4,6-iPr3C6H2) with unsymmetrical substitution patterns (including Si, SiR, and SiR2 vertices) is reported. In order to account for the importance of such clusters as model systems for transient intermediates in the deposition of elemental silicon, we here propose the term siliconoids for silicon clusters with unsaturated valencies. With the hexasilaprismane 8a, a saturated-i.e., non-siliconoid-Si6R6 isomer is accessible from a suitable Si3 precursor. Thermal redistribution of the substituents converts 1,1,2-trichlorocyclotrisilane 6 into the corresponding 1,2,3-derivative 7 prior to the requisite reductive coupling step leading to 8a. On the other hand, a stable expanded Si11-siliconoid 9 was isolated as a minor side product of the thermal isomerization of 4 to 5, thus providing a first example of siliconoid cluster expansion in the condensed phase. In the solid-state structure, the two unsubstituted vertices of 9 strongly interact in a staggered propellane-like fashion. Oxidative cluster contraction of a siliconoid scaffold is observed upon treatment of siliconoid 5 with a large excess of iodine in refluxing toluene, thus providing access to a highly functionalized hexaiodocyclopentasilane 11 in high yield. Conversely, chlorination of the isomeric 4 with BiCl3 as a mild source of Cl2 results in a complex mixture of products from chlorination of the unsubstituted vertices as well as σ-bonds of the cluster framework of 4. The main product, 1,2-dichlorotricyclo[2.2.0.02,5]hexasilane 12, undergoes thermal cluster contraction to give tricyclo[2.1.0.02,5]pentasilane 14 with an exohedral chlorosilyl group.
A stable derivative of the global minimum on the Si6H 6 potential energy surface
Abersfelder, Kai,White, Andrew J. P.,Berger, Raphael J. F.,Rzepa, Henry S.,Scheschkewitz, David
supporting information; experimental part, p. 7936 - 7939 (2011/10/05)
Silicon shuffle minimizes energy: Isomerization of the dismutational isomer of hexasilabenzene (see structure; R=2,4,6-iPr3C6H 2) produces the Si-bridged propellane, a stable representative of the global minimum on the Si
