4
30
A.K. Sharma, S. Chandra / Spectrochimica Acta Part A 81 (2011) 424–430
mass spectra support the proposed stoichiometry of complexes by
elemental analyses. It is evident from the mycological studies of
the compounds against the opportunistic pathogens that the com-
pounds show the effective fungicidal behavior. The administration
of the compound as the metal ion derivative exhibits the moder-
ate antipathogenic behavior. This accounts that the efficacy of the
organic compound is positively modified on association with metal
ion.
Acknowledgement
The financial assistance of DRDO, New Delhi is greatly acknowl-
edged.
Fig. 8. Graph showing effect of concentration on antipathogenic behavior of com-
pounds against A. brassicae.
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with the dx
2
−y
2
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have the moderate antipathogenic activities (Fig. 7). This mod-
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derivative has been prepared by its acid catalyzed condensation
with 1,4-diformylpypartzine. The interaction of this derivative with
Co(II), Ni(II) and Cu(II) metal ions forms the stable complexes. The
mass, IR, UV and EPR spectroscopic studies lead to the conclu-
sion that the nickel complexes have octahedral geometry, whereas
cobalt and copper complexes are of tetragonal geometry with
the tetradentate ligand coordinated through azomethine nitro-
gen and ketonic oxygen atoms (ONNO fashion). The low value of
covalency factor ˇ for nickel and cobalt complexes and orbital
reduction factor k for copper complexes reveals the partial cova-
lent interaction between ligand donor atoms and metal ions. The
[
[
[
[
[
[
[