Silylacetylene dendrimers: synthesis and characterization

Abstract

The first silylacetylene dendrimers (1G and 2G) with alternating silicon-acetylene units [(SiC•C) n ] have been synthesized and characterized by spectroscopic methods; the X-ray structure of 1G is reported.

Fluoride‐Ion Encapsulation within a Silsesquioxane Cage

“…Octaspherosilicate structures have found use as scaffolds for dendrimer synthesis, [1][2][3][4] as models for aluminosilicate structures, [5] and as supports for organometallic catalysts. [6][7][8] Space-filling models of such cages suggest there is a void at the center of the cube, but that it is questionable whether it could be filled by an atomic species.…”

Synthesis and characterisation of new oligoacetylenic silanes

“…The molecular design and synthesis of linear, cyclic or dendritic systems composed of silicon atoms and acetylene units has aroused considerable interest. [1][2][3][4][5] These carbon-rich acetylenebased scaffolds have been demonstrated to exhibit intriguing electrical, electronic, optical and structural properties. [1][2][3][4][5] The lower ionisation energy of the silicon atom compared with carbon is expected to enhance the through-bond interaction of ethynyl units along the backbone.…”

“…[1][2][3][4][5] These carbon-rich acetylenebased scaffolds have been demonstrated to exhibit intriguing electrical, electronic, optical and structural properties. [1][2][3][4][5] The lower ionisation energy of the silicon atom compared with carbon is expected to enhance the through-bond interaction of ethynyl units along the backbone. 6,7 In this context, the chemistry of linear inorganic polymers containing alternating arrangements of silylene and p-electron moieties represents an important area of current active research because they possess good potential as functional materials such as semiconductors, 8 hole-transporting [9][10][11] and heat-resistant materials, [12][13][14] photoresists 15,16 and ceramic precursors.…”

“…[21][22][23][24][25][26][27][28] However, to our knowledge, reports on the synthesis of linear oligoacetylenic silanes have been scarce and related problems in this area remain relatively unexplored. 5,29,30 Alkynylsilane-based short-chain oligomers are not only key intermediates in the preparation of their polymeric or cyclic compounds but also useful alternative materials with potentially enhanced performance by limiting the conjugation length of the polymer. 31,32 In this respect, oligo(phenylene vinylene)s represent one of the best examples that have recently drawn considerable attention.…”

Symmetric Tetraalkynyldisilanes

“…Some of these products have been isolated. [2,3] Moreover, in a few compounds the alkynyl group acts as a linker between silicon and carbon atoms or two silicon atoms, respectively, forming chains [4,5] or heterocycles. [6,11] In Scheme 1 two examples of heterocycles containing alkynyl groups are shown.…”