Magnetically interesting transition metal-seamed architectures is a significant area of endeavor. Manipulations in metallosupramolecular complexes have yielded tuned molecular magnetic materials, with possible biomagnetic and electronic applications. C-alkylpyrogallol[4]arene based nanoassemblies are primarily composed of nickel, copper, iron, zinc, gallium and cobalt metal ions. Of these supramolecular self-assembled architectures, nickel-seamed hexamers and dimers, ferrocene enclosed tubes and dimers, and iron-containing nanotubes based on pyrogallol[4]arenes are magnetically interesting. Magnetic properties observed as a function of structural arrangement should allow us to investigate the origins of antiferromagnetism and paramagnetism, typically observed in these metals. In our current study, we perform hysteresis and magnetization versus temperature studies to investigate the magnetic behavior of nickel/iron-containing pyrogallol[4]arene based nanoassemblies. Preliminary studies indicate paramagnetic behavior with weak-antiferromagnetic alignment at low temperatures for these nanoframeworks, originating from the weak dipolar interaction between adjacent metal atoms. These results will help to elucidate how the structures and magnetic behavior of nanoassemblies containing Fe+2 versus Ni+2 compare.

Magnetic behavior of metal-containing pyrogallol[4]arene based nanoassemblies

244th National Meeting (2012)

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