π Groups in ion pair bonding: the structural effects of reduction on the olefinic bond as observed in the molecular structure of Δ9,9′-bifluorenyl bis(lithium tetramethylethylenediamine)
| Autor: | Michael Walczak, Galen D. Stucky |
|---|---|
| Rok vydání: | 1975 |
| Předmět: |
Olefin fiber
Stereochemistry Organic Chemistry Crystal system chemistry.chemical_element Tetramethylethylenediamine Biochemistry Inorganic Chemistry Bond length chemistry.chemical_compound Crystallography chemistry Materials Chemistry Molecule Lithium Physical and Theoretical Chemistry Single crystal Monoclinic crystal system |
| Zdroj: | Journal of Organometallic Chemistry. 97:313-323 |
| ISSN: | 0022-328X |
| DOI: | 10.1016/s0022-328x(00)89301-8 |
| Popis: | The reaction of 9,9′-bifluorene with n-butyllithium in the presence of tetramethylethylenediamine (TMEDA) results in the formation of Δ9,9′-bifluorenyl bis-(lithium tetramethylethylenediamine). In the molecular structure of this material, which formally can be considered to be the dianion of the olefin Δ9,9′-bifluorene, two TMEDALi groups are closely associated with the 9,9′ bond. The fluorenyl groups are twisted relative to each other by an angle of 48.0(5)°, as compared to 42° in the parent olefin. The 9,9′ bond length is increased from 1.39(2) A in Δ9,9′-bifluorene to 1.487(5)A in the dianion. Single crystal X-ray diffraction techniques were used and resulted in a final discrepancy factor of Rw = 0.064 for 2426 observations. The crystal system is monoclinic (C2/c) with a = 10.814(3), b = 16.717(6) and c = 19.766(6) A, β = 102.55(2)°; ϱobs = 1.10(3) g cm−3; ϱcalc = 1.095 g cm−3 for four molecules per unit cell. |
| Databáze: | OpenAIRE |
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