Abstract
The equilibrium molecular structure of octaphenyloctasilsesquioxane Si 8O12Ph8 in the gas phase has been determined by electron diffraction. It was found to have D4 point-group symmetry, with Si-O bond lengths of 1.634(15)-1.645(19) Å, and a narrow range [147.5(45)-149.8(24)°] of Si-O-Si angles. The structures of Si 8O12(p-tolyl)8 and Si8O 12(p-ClCH2C6H4)8 have been determined by X-ray diffraction and are found to have Si8O 12 cages significantly distorted from the symmetry found for Si 8O12Ph8 in the gas phase. Thus, Si-O-Si angles range between 144.2(2)-151.64(16)°for Si8O12(p-tolyl) 8, and between 138.8(2)-164.2(2)°for Si8O 12(p-ClCH2C6H4)8. These three structures show how much a Si8O12 cage may be distorted away from an ideal structure, free from intermolecular forces, by packing forces in a crystalline lattice. © The Royal Society of Chemistry 2010.
Original language | English |
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Pages (from-to) | 6960-6966 |
Journal | Dalton Transactions |
Volume | 39 |
Issue number | 30 |
DOIs | |
Publication status | Published - 14 Aug 2010 |
Bibliographical note
Cited By (since 1996):2Export Date: 1 October 2013
Source: Scopus
doi: 10.1039/c000664e
PubMed ID: 20440427
Language of Original Document: English
Correspondence Address: Zakharov, A. V.; Department of Physics, Ivanovo State University of Chemistry and Technology, Engelsa 7, Ivanovo 153000, Russian Federation; email: [email protected]
Chemicals/CAS: Gases; Organosilicon Compounds
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Keywords
- Crystalline lattice
- Gas-phase structures
- Gasphase
- Intermolecular forces
- P-tolyl
- Packing forces
- Point group symmetry
- Chemical bonds
- Crystal structure
- Gases
- X ray diffraction
- Silicon
- organosilicon derivative
- article
- chemical structure
- chemistry
- gas
- synthesis
- X ray crystallography
- Crystallography, X-Ray
- Models, Molecular
- Molecular Structure
- Organosilicon Compounds