The electrical conductances of lithium and sodium perchlorates and of some quaternary ammonium halides and perchlorates in propylene carbonate (PC) + tetrahydrofuran (THF) (1:l in volume) have been measured at 25 OC. The conductance data were analyzed by a minimization technique using the complete form of the Fuoss/Hsia (F/H) equation. All electrolytes were found to be anomalous in showing unusually higher molar conductances than in each solvent alone. The effect of the variation of the three parameters KA, A,, and a was fully investigated.

The conductance of aqueous solutions of magnesium, manganese II, and barium malonates has been measured at 1.59 kHz, using a conventional audio frequency bridge. Conductance data were evaluated using different modern theoretical conductance equations, each a three-parameter equation in KA, Λ0, and a. These are the complete and expanded forms of both the Fuoss–Hsia (F/H) and Pitts (P) equations and the Lee–Wheaton (L/W) equation. Our results show that the Lee–Wheaton equation is the most satisfactory. Keywords: conductance, aqueous medium, magnesium malonate, manganese malonate, barium malonate.

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The electrochemical behavior of diphenyl ditelluride, bis(2-amino-5-methyl phenyl)ditelluride and bis(2-amino-5-bromo phenyl)ditellurid have been investigated by cyclic voltammetry(CV) in methanol or THF at room temperature. The results showed two single successive electron transfer through the reduction process. This technique was used to determine the best voltage regions in order to carry out the electrochemical synthesis of unsymmetrical organic telluride, i.e : ethyl phenyl telluride (1), propyl phenyl telluride(2), butyl phenyl telluride(3), ethyl (2-amino-5-methyl phenyl)telluride(4), propyl(2-amino-5-methylphenyl) -telluride(5), butyl (2-amino-5-methylphenyl)(6), ethyl(2-amino-5 bromophenyl telluride(7), propyl(2-amino-5-bromo phenyl) telluride(8) and butyl(2-amino-5-bromophenyl) telluride(9). All new compounds were characterized by CHN and IR spectroscopy.