Izutsu studies

Izutsu et al. studied the compiexing of Na" in acetonitrile solution with various protic and aprotic solvents using an ion-sensitive glass electrode. Parker s assumption of negligible liquid junction potential with an tetraethylammonium picrate salt bridge was adopted and found to be valid, even when water was added. The formation constants increased in the order methanol < H2O < DMF < NJ -dimethylace-tamide DMSO < HMPA. 

Potentiometric measurements have also been used in such studies. As an example we mention only the work of Larson and Iwamoto [257] on Cu(II) hydration in nitromethane, that of Luehrs coworkers [258, 259] on stability constants of silver(I) with DMF, DMSO, and HMPA, and the studies of interaction of sodium(I) with different protic and aprotic solvents and acetonitrile media carried out by Izutsu and coworkers [260]. 

Huffman, M.A., Gotoh, S., Izutsu, D., Koshimiz, K. and Kalunde, M.S. (1993). Further observations on the use of Vernonia amygdalina by a wild chimpanzee, its possible effect on parasite load, and its phytochemistry. African Study Monographs, 14 227-240. 

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