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polarity of the metal ion by partial sharing of its positive charge with
the donor groups, and possibly ꢂ-electron delocalization within the
whole chelate ring [28]. This process thus increases the lipophilic
nature of the central metal atom [29], which, in turn, favors its
greater penetration through the bacterial wall of the microor-
ganisms, thus killing them more effectively [30]. It has also been
observed that the solubility, conductivity and dipole moment are
also influenced by the presence of metal ions; these could be
the significant factors responsible for increasing the hydrophobic
character and liposolubility of the molecule, hence enhancing the
biological activity.
The results of antibacterial activity reveal that the SFP–Cu(II)
showed the highest antibacterial and antifungal activity than other
polymer metal complexes. This result may have been due to the
higher stability constant of Cu(II) than the other polychelates [31].
According to the stability constant, the Cu(II) ion was made up
of stronger interactions with N and O donor atoms, by which its
lipophilic nature was increased.
Third World Academy of Sciences, Italy” for UV–Visible spectropho-
tometer EZ-201 (PerkinElmer) through research grant scheme No.
00-047 RG/CHE/AS.
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5. Conclusion
SFP ligand and its polymer metal complexes of Mn(II), Co(II),
Ni(II), Cu(II) and Zn(II) metal ion in basic medium were prepared
successfully. These polymer metal complexes showed octahedral
geometries except zinc, as depicted by the electronic spectra, and
the thermal analysis (TGA) of the complexes elucidated the com-
position, the number and nature of water molecules. The presence
of the water molecules in polymer metal complex generated two
decomposition steps which indicate a different bonding charac-
ter of water molecules as ligands. The following decomposition
step in the case of this compound could be associated with forma-
tion of a stable intermediate with SFP-ligand, coordinated to metal
ion. The thermal stability of SFP–Cu(II) is better amongst coordina-
tion polymers. The fairly good antimicrobial activities exhibited by
these polymer metal complexes may help them to find potential
application as effective antimicrobial coating materials.
Acknowledgements
Shamim A. Khan is thankful to UGC (New Delhi, India) for finan-
cial assistance. The authors express their sincere thanks to “The