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Aggregation and solvation of 9-propylfluorenyllithium and of α,ω-BIS(9-fluorenyllithium)polymethylenes in toluene by U. Takaki; G.L. Collins; J. Smid is a Chemistry article available to read on EtoBox.

What is Aggregation and solvation of 9-propylfluorenyllithium and of α,ω-BIS(9-fluorenyllithium)polymethylenes in toluene about?

Bolaform salts of the type Li',Fl-(CH,), Fl-,LT (Fl-= 9fluoreny1, n = 2,4 or 6), when dissolved in toluene, were shown to be present as intramolecular aggregates (X, 370 nm) which can be broken up on addition of tetrabydrofuran (THF) or tetrahydropyran (TI-IP) to form solvated tight ion pairs (h, 361 nm) and loose ion pairs (h, 386 nm). For n = 6 the ratio K1/K2 of the loose ion pair formation constants for the two terminal ion pairs is close to the statistical factor 4, but for n = 2 the ratio is only 0.3. This is attributed to a higher stability of the intramolecular aggregate for this compound. The data for the bolaform salts were compared with those obtained for the one ended salt 9-(n-propyl)fluorenyllithium. For the latter compound, an equilibrium between the monomeric ion pair (X, 353 nm) and the dimeric ion pair aggregate (A, 370 nm) was found, the dissociation constant & being 2.9 X 10m6 iW Addition of THP produces the THP solvated tight ion pair (h, 361 nm) and the loose ion pair (h, 386 nm).

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Author

U. Takaki; G.L. Collins; J. Smid

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0022-328X)

Published

1978

Language

EN

Field

Chemistry (Physical Sciences)