Abstract
The relative viscosities ηr of dilute aqueous solutions of azoniaspiroalkane bromides, (CH2) n N+ (CH2) n Br− (wheren=4, 5, and 6), have been measured at 25°C. The viscosityB η andD η coefficients were determined using the extended Jones-Dole equation
TheB η coefficients obtained for the bicyclic azoniaspiroalkane bromides were compared with those of the corresponding homologous tetra-n-alkylammonium bromides. Based on the obtained sign and magnitude of (B n −0.0025ø ∘v ) for the salts and for the bicyclic ions, the structural effects of cation geometry and alkyl group flexibility on water are discussed. The results indicate that the hydrophobic (clathrate hydrate-like) character of the larger tetra-n-alkylammonium ions is reduced significantly when cyclic groups are formed from the alkyl chains in symmetrical quaternary ammonium ions.
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Surdo, A.L. Relative viscosity and viscosity coefficients of aqueous azoniaspiroalkane bromides at 25°C. J Solution Chem 8, 439–447 (1979). https://doi.org/10.1007/BF00716003
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DOI: https://doi.org/10.1007/BF00716003