الفهرس 
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Abstract
We report the synthesis and the characterization of nanometer sized rod - like ligand, 2,2’-
(1,3,5,7-tetraoxopyrrolo[3,4-f] isoindole-2,6(1H,3H,5H,7H)-diyl) bis (3-(1H- indol-3-yl)
propanoic acid) (H2L). Direct reaction of the ligand with MX2 (M = Cu, Co, Ni and Zn; X =
acetate, chloride and nitrate) afforded the corresponding dinuclear complexes,
[Zn2(L)(Ac)2.]3H2O, [Cu2(L)(Ac)2.(H2O)4], [Ni2(L)(Ac)2].H2O, [Co2 (L)(Ac)2.(H2O)4].4H2O,
[Ni2(L)Cl2.(H2O)2], [Co2(L)Cl2(H2O)2.] and [Zn2L(NO3)2.]3H2O in a good yield as well as
mono-nuclear complexes, [Cu(HL)Cl.H2O] and [Cu(HL)NO3.H2O]. The metal complexes
were characterized by physicochemical techniques. Spectroscopic and magnetic susceptibility
studies demonstrated the octahedral geometries for Cu(II) and Co(II) acetate complexes while
tetrahedral geometries for (acetate and chloride) Ni(II) and (acetate and nitrate) Zn(II)
complexes. The mono-nuclear [Cu(HL)Cl.H2O] and [Cu(HL)NO3.H2O] were found to be
square planer and square pyramidal geometries, respectively. The data revealed that
coordinated carboxylate group present in H2L exist as a bridged bidentate ligand in the
transition metal (II) complexes. Thermogravimetric analysis studied the decomposition
pattern and the stability of the complexes. The parent ligand and its complexes were screened
for their antimicrobial activity.