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ARPN Journal of Science and Technology >> Volume 7, Issue 1, January 2017

ARPN Journal of Science and Technology

Spectral and Potentiometric Studies On Manganese (II) and Cobalt (II) Complexes with Schiff Base Derived From 2-Thiophenecarboxylaldehyde and 2-Aminobenzoic Acid

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Author H. N. Aliyu , A. Danlami
ISSN 2225-7217
On Pages 147-154
Volume No. 2
Issue No. 3
Issue Date May 01, 2012
Publishing Date May 01, 2012
Keywords 2-aminobenzoic acid, 2-thiopenecarboxyldehyde, Schiff base, complex compound, stability constant and dissociation constant.


Reaction of ethanolic solutions of 2-aminobenzoic acid and 2-thiophenecarboxyldehyde gave a Schiff base. The reaction of the ethanolic solutions of the Schiff base with metal (II) chlorides formed complex compounds. Their solubility, melting point/decomposition temperature, molar conductance, and IR were carried out. The melting point of the Schiff base and the decomposition temperature of the complexes determined are high. The Schiff base and its metal complexes are soluble in common organic solvent but insoluble in water. The molar conductance of the complexes determined suggested that the complex compounds are non-electrolytes. The empirical formula calculation of the complex compounds indicated the formula [ML2].H2O. The infrared spectral data of the Schiff base and its metal complexes showed bands at 1600 cm-1 and 1610 cm-1, which are assigned to v(C=N) stretching frequencies. The bands at 500 515 cm-1 and 490 495 cm-1 are attributable to v(M-O) and v(M-N) stretching vibrations. The spectral bands in the range 3092 3298 cm-1 are assigned to v(O-H) stretching frequencies. The dissociation constant of the Schiff base is 6.8, indicating a weak acid. The stability constants of the complexes are high.

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