Abstract
Complexes of nifuroxime (anti‐5‐nitro‐2‐furfuraldoxime, 5N‐FDH) with Mn(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II), La(III) and UO2(VI) have been prepared and characterized by elemental analyses, conductivity measurements, spectral and thermal studies. Also, some mixed nifuroximato‐phenylalaninato,‐tyrosinato or ‐methioninatonickel(II) complexes have been prepared and characterized by the previous methods. The complexes have the general formulae: [M(5N‐FD)2·mH2O]n; [La(5N‐FD)(OOCCH3)2(H2O)2]2; [UO2(5N‐FD)2]·2H2O and [Ni(5N‐FD)(L)]·H2O where M = Mn(II) Co(II), Ni(II), Cu(II), Zn(II) or Cd(II); m = 0 for M = Mn(II), m = 1 for M = Co(II), Ni(II) or Cd(II) and m = 2 for M = Cu(II) or Zn(II); L = phenylalaninate, tyrosinate or methioninate. All complexes were isolated at pH 6 using NH4OH solution. Nifuroxime acts as a uninegative ligand in all complexes with various modes of coordination. Thermogravimetric studies show a rapid decomposition stage for all the complexes accompanied by other slow stages; the final product of all complexes is the metal oxide.
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