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Spectrophotometric Analysis on Anticonvulsant
Bis(N-isatin benzene-1-hydroxy-2-iminato) Mn(II),
Fe(II) and Co(II) Complexes
H. N. Aliyu and Z. Suleiman
Department of Chemistry Bayero University, P. M. B.
3011, Kano, Nigeria
*Corresponding Author E-mail:
hnuhu2000@yahoo.com
Accepted
18 June, 2012
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The Schiff base was prepared by reacting equimolar
amounts of benzene-1-hydroxy-2-amine and isatin in
absolute methanol. The metal chelates were prepared
by the reaction of the methanolic solutions of the
respective metal(II) chloride and the prepared
Schiff base. The Schiff base and the complexes were
characterized by elemental analysis, infrared, molar
conductivity, potentiometry, solubility and melting
point. The Schiff base reddish brown, has a melting
point temperature of 193oC, and
percentage yield of 81%. Its complexes with Mn(II),
Fe(II) and Co(II) are brown, have decomposition
temperatures of 230, 260 and 240oC, and
percentage yields of 50, 80 and 73%, respectively.
The Schiff base and its metal complexes are soluble
in water and most common organic solvents except
ether and hexane. The molar conductance of the
complexes determined are low. The empirical formula
calculation of the complex compounds indicated the
formula [ML2]. nH2O, where n
is 4 for manganese(II) complex, and 2 for Fe(II) and
Co(II) complexes. The spectral band at 1668cm-1
in the spectral data of the Schiff base is assigned
to v(C=N) stretching vibrations, which undergoes a
Schift to lower wave numbers in the range 1580 –
1611cm-1 on coordination to the metal
ions. The bands within 447 – 454cm-1 and 567 –
640cm-1 are attributable to v(M-N) and v(M-O)
vibration modes.
Keywords: Benzene-1-hydroxy-2-amine, isatin,
chelate, Schiff base, potentiometry, manganese(II)
chloride, iron(II) chloride and cobalt(II) chloride.
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