Novel charge-transfer complexes of pyrazine Schiff bases derived from 2-aminopyrazine with benzaldehyde and N-4-dimethylaminobenzaldehyde with some aromatic nitro compounds have been synthesized and characterizes experimentally and confirmed theoretically.

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New amineptine hydrochloride (Am-Cl) ion-selective electrodes (conventional type) based on amineptinium-tetraphenylborate (I) and amineptiniumphosphomolybdate (II) were prepared. The electrodes exhibited mean slopes of calibration graphs of 57.9 mV and 53.8 mV per decade of (Am-Cl) concentration at 25 C for electrodes (I) and (II), respectively. The electrodes can be used within the concentration range 3.16Â10 À5 À10 À2 M (Am-Cl) at a pH range of 2.0±3.9 for both electrodes. The standard electrode potentials were determined at different temperatures and used to calculate the isothermal coef®cients of the electrodes, which were 0.00172 V C À1 and 0.00091 V C À1 for (I) and (II) electrodes, respectively. The electrodes showed a very good selectivity for (Am-Cl) with respect to a number of inorganic cations and sugars. The standard addition method is successfully applied to determine (Am-Cl) in pure solutions and in amineptine-containing tablets.

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