Journal of Solution Chemistry

, Volume 8, Issue 6, pp 439–447 | Cite as

Relative viscosity and viscosity coefficients of aqueous azoniaspiroalkane bromides at 25°C

  • Antonio Lo Surdo
Article

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 viscosityBη andDη coefficients were determined using the extended Jones-Dole equation

$$\eta _r = 1 + A_\eta c^{1/2} + B_\eta c + D_\eta c^2$$

TheBη 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.

Key words

Relative viscosities viscosity coefficients azoniaspiroalkane bromides tetraalkylammonium salts hydrophobic hydration ion-solvent interactions 

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Copyright information

© Plenum Publishing Corporation 1979

Authors and Affiliations

  • Antonio Lo Surdo
    • 1
  1. 1.Jeppson Laboratory, Chemistry DepartmentClark UniversityWorcester

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