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Spectroscopic and Potentiometric Studies of N-(2Hydroxybenzyl)-L-α-Valine Cobalt (II) Complex Aliyu, H. N. & Isyaku, S. Abstract A Schiff base was prepared from the reaction of 2-hydroxybenzylaldehyde and L-valine. The reaction of the Schiff base and cobalt (II) chloride formed 2-hydroxybenzylaldehyde and L-valine cobalt (II) complex. The Schiff base is crystalline white and has a yield of 66%. The prepared complex is pale brown, has a yield of 68% and decomposition temperature of 274°C. The Schiff base and its cobalt (II) complex are insoluble in most common solvents however they are soluble in ethanol-water mixture. The molar conductance of the cobalt (II) Schiff base complex compound determined is 5.2 ohm cm2 mol-1. The infra-red spectra of the Schiff base showed band in the range 1480 -1520cm-1, assignable to v(C=N) stretching vibrations, the same band is observable in the cobalt (II) Schiff base complex. The broad band in the range 3270 -3420cm-1 observed in Schiff base is assigned to v(O-H) stretching vibrations. The diss°Ciation constant (pKa) of N - (2 - hydroxybenzyl) -L -α -valine Schiff base determined is 8.84. The average number of the Schiff base to cobalt (II) ion is 1 (one). Keywords Schiff base; Cobalt (II) complex; 2-Hydroxybenzaldehyde; L-valine; Stability constant; Potentiometry.

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