Supramolecular Silanol Chemistry: Inclusion Complexes of 1,3,5‐Tris(diisopropylhydroxysilyl)benzene and 4,4′‐Bis(pyridines)

Abstract

The trisilanol 1,3,5-(HOiPr 2 Si) 3 C 6 H 3 (5), a novel building block for applications in supramolecular chemistry, has been prepared via the intermediates 1,3,5-(HiPr 2 Si) 3 C 6 H 3 (6) and (CliPr 2 Si) 3 C 6 H 3 (7). The inclusion complexes 5·0.5H 2 O, 5·bpy·0.5H 2 O, 5·bpe, 5·azpy and 5·bpa have been investigated by X-ray crystallography [bpy = 4,4Ј-bipyridine, bpe = (E)-bis(4-pyridyl)ethylene, azpy = 4,4Ј-azopyridine, bpa = bis(4-pyridyl)aceylene]. The ratio between donor and acceptor molecules is always 1:1 and the crude supramolecular motifs are very similar for 5·bpy·0.5H 2 O, 5·bpe, 5·azpy and 5·bpa. The trisilanol molecules form 1D chains, which are

A spectroscopic investigation of incompletely condensed polyhedral oligomeric silsesquioxanes (POSS-mono-ol, POSS-diol and POSS-triol): Hydrogen-bonded interaction and host–guest complex

“…A novel silanol of 1,3,5-(HOiPr 2 Si) 3 C 6 H 3 could co-crystallize with 4,4 0 -bipyridine (bpy), (E)-bis(4-pyridyl)ethylene (bpe), 4,4 0 -azo-pyridine (azpy) and bis(4-pyridyl)acetylene (bpa) those exhibit similar supramolecular motifs featuring 2D grid networks of O-HÁ Á ÁO(H)Si and O-HÁ Á ÁN hydrogen bonds reported by Beckmann et al [10]. Now one of the current research efforts in our group addresses the possibility of various different silanols as anion receptors.…”

“…8 showed the 1 H NMR spectral changes of POSS-mono-ol upon the addition of Cl À . For POSSmono-ol, large ratios of Cl À and POSS-mono-ol (10,50,75 and 100 equiv.) should be chosen; the chemical shift was 3.14, 4.53, 5.05 and 5.58 ppm, respectively.…”

Hydrogen-Bonding 3D Networks by Polyhedral Organosilanols: Selective Inclusion of Hydrocarbons in Open Frameworks

“…Derivatives of tetraphenylmethane, − -silane, − and -adamantane ,,− are useful organic building blocks for production of an adamantane-type network structure. Many examples of such adamantane-type networks exist involving a strongly hydrogen-bonded group such as a carboxylic acid, borol, pyridone, or metal complex. , Although silanols are known to form strong hydrogen bonds, there are few networks involving 3D hydrogen-bonded networks of silanols . Herein, polyhedral organosilanols based on tetraphenylmethane ( 2a ) and -silane ( 2b ), as well as octastyryloctasilsesquioxane ( 5a , b ), are used as T d and O h symmetrical organic building blocks, designed for 3D hydrogen-bonding networks.…”

Structural diversity in the solid-state architectures of bis(4-pyridyl)acetylene and its derivatives

“…The structure of compound 1 reported here is a re-determination of 1b. It is quite surprising that there was the long existence of quite a number of supramolecular-relevant structures [22][23][24][25][26] ranging from coordination complexes, host-guest inclusion molecules, 1D, 2D and 3D grid networks and co-crystals with a rich network of intermolecular interactions [27][28][29][30][31][32][33][34][35][36] before the recently published polymorphs of pure bis (4-pyridyl)acetylene. With the exclusion of structures 1a and 1b, about twenty-three (23) of these structures represent different species while the remaining seventeen (17) stand out as repetition of existing molecular structures within the same classification.…”