Electrochemical adsorption of the symmetrical rigid molecule 1,4-diazabicyclo-(2,2,2) octane at mercury electrodes: Solvent and adsorbate orientation behaviour
✍ Scribed by B.E. Conway; H.P. Dhar
- Publisher
- Elsevier Science
- Year
- 1974
- Tongue
- English
- Weight
- 855 KB
- Volume
- 19
- Category
- Article
- ISSN
- 0013-4686
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✦ Synopsis
The role of solvent orientation and displacement in electrochemical adsorption is of current Interest. The adsorptron of the symmetrical and almost spherical molecule 1,4-dlazablcyclo-(2,2,2) octane, [N(CH,-CH,),N]
("DBO") h as b ecu studied at the Hg electlode in relation to previous measurements on pyrazine and pyridine adsorption. Evaluation of the free-energy of adsorption as a function of surface charge and coverage, and of the Esin and Markov effects, enables the complex adsorption behaviour observed with this molcculc to be elucidated. The Esin and Markov effect is made up of two principal surface dipole pd terms: one due to displacement of oriented solvent molecules and the other due to urientation of the organic adsorbate itself. Both terms ale dependent on surface charge. Relations to the surface pressure behaviour are investigated.