Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases p. 3357 - 3366 (1986)
Update date:2022-08-11
Topics:
Akanni, M. Sola
Mbaneme, P. Chuckwulozie
Data are presented for electrical conductances of molten lead(II) 9,10-dihydroxyoctadecanoate and the system lead(II) octadecanoate-lead(II) 9,10-dihydroxyoctadecnoate.The lead(II) 9,10-dihydroxyoctadecanoate is prepared from 9,10-dihydroxyoctadecanoic acid which in turn is obtained from the oxidation of cis-9-octadecanoic acid by hydrogen peroxide in methanoic acid.For the mole fraction of lead(II) 9,10-dihydroxyoctadecanopate /= 0.03.The maximum is interpreted in terms of the current carriers (Pb(2+) ions) recting with the dihydroxy groups to form a bridged cyclo-acid.The observed low conductance of pure lead(II) 9,10-dohyroxyoctadecanoate and the decrease in conductance of the mixtures compared with lead(II) octadecanoate is suggested to be due to the relatively small dissociation of the dihydroxy soap.Activation energies for conductance in the low-temperature region show a steady decrease with increasing mole fraction of lead(II) 9,10-dihydroxyoctadecanoate up to a certain composition and then increase.Theis behaviour is attributed to a change in the microscopic structure of the melt owing to the increasingly dominant role of the substitued hydroxy groups.The activation energy for the pure dihydroxy soap is close to those of other lead(II) soap, suggesting that the major charge is probably the same, i.e. the Pb(2+) ion.
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