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

Autor:	Antonio Lo Surdo
Rok vydání:	1979
Předmět:	chemistry.chemical_classification Aqueous solution Bicyclic molecule Chemistry Relative viscosity Inorganic chemistry Clathrate hydrate Biophysics Cyclic group Biochemistry Ion Viscosity Physical chemistry Physical and Theoretical Chemistry Molecular Biology Alkyl
Zdroj:	Journal of Solution Chemistry. 8:439-447
ISSN:	1572-8927 0095-9782
Popis:	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 $$\eta _r = 1 + A_\eta c^{1/2} + B_\eta c + D_\eta c^2$$ 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 −0.0025o 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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::1e1fd1f5a05529339ce32e7d98a9dcfe https://doi.org/10.1007/bf00716003 Zobrazit plný text záznamu Full text from SpringerLink