ISSN:
1436-2449
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Summary Poly(2-vinylfluorene) was metallated in tetrahydrofuran (THF) and 1,2-dimethoxyethane (DMF) by means of the sodium salt of the dianion dimer of 1,1-diphenylethylene. Initially, the formation of poly(2-vinylfluorenylsodium) is very rapid, but slows down drastically in the later stages of the reaction. Quantitative metallation was accomplished in both solvents. Spectrophotometric evidence in DME as solvent points to a loose fluorenyl ion pair structure at low degrees of metallation, but the structure changes to that of a predominantly tight ion pair when metallation is completed. In THF only tight ion pairs are stable at room temperature, independent of the degree of metallation, but the molar absorptivity of the carbanion has decreased by nearly thirty percent when the polymer is fully metallated.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00265260
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