ISSN:
0021-8383
Keywords:
Chemistry
;
Organic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The Role of Donor-Acceptor Complexes in Cationic Polymerisations. The Interaction of Halide Ions with Organic aπ-AcceptorsThe anions of salts of the type Kat+X- (Kat+ = Li+, Na+, Et4N+; X- = Cl-, Br-, I-) form donor-acceptor complexes with organic a π-acceptors. The long-wave charge-transfer absorption show a bathochrome shift with higher periodic numbers of X- and increasing electron affinity of the acceptors Acc. Strong acceptors form radical ions very rapidly with X = I and slowly with X = Br. Cl.The interactions in the system Kat+X- → Acc are influenced by solvents in a very complex way. As acceptors they interact preferably with the halide ion X- and, hence, reduce its donicity for the competing acceptor Acc. As donors they change the dissociation of the ion pair Kat+X- by solvation of the cation Kat+ and influence in that indirect way also the donicity of X- for the acceptor Acc.
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/prac.19793210320
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