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# Self-Assembly of Molecular Nanoball: Design, Synthesis, and Characterization

Ghosh, Sushobhan and Mukherjee, Partha Sarathi (2006) Self-Assembly of Molecular Nanoball: Design, Synthesis, and Characterization. In: Journal of Organic Chemistry, 71 (22). 8412 -8416.

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## Abstract

The design and self-assembly of two new flexible supramolecular nanoballs are described. These assemblies incorporate two flexible tritopic amide and ester building blocks and were prepared in excellent yields (96-97 %) via coordination driven self-assembly. The first resulted from the reaction of 4 equiv of a new tritopic ester ligand $N,N^{\prime},N^{\prime}^{\prime}$-tris(4-pyridylmethyl) trimesic ester and 3 equiv of $C_4$ symmetric $Pd(NO_3)_2$. The second analogous structure was obtained by the self-assembly of a flexible $N,N^{\prime},N^{\prime}^{\prime}$-tris(3-pyridylmethyl) trimesic amide and $Pd(NO_3)_2$. The assemblies were characterized with multinuclear NMR spectroscopy, electrospray ionization mass spectroscopy, elemental analysis, and TGA. Mass spectrometry along with NMR data and TEM view confirms the existence of the two assemblies. MM2 force field simulations of the cages showed a ball shape with the diameter of the inner cavity of about 2.1 and 1.8 nm for 2a and 2b, respectively, which were also corroborated by TEM analysis

Item Type: Journal Article Copyright of this article belongs to American Chemical Society. Division of Chemical Sciences > Inorganic & Physical Chemistry 30 May 2008 19 Sep 2010 04:45 http://eprints.iisc.ernet.in/id/eprint/14076

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