Synthesis
and Characterization of Self-Assembled Nanoscopic
Metallarectangles Capable of Binding Fullerenes with Size-Selective
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Abstract
Two
new metallarectangles, <b>4</b> and <b>5</b>, were
obtained from the self-assembly of areneruthenium-based molecular
clips <b>2</b> and <b>3</b> with a new dipyridyl donor
ligand <b>1</b> containing a diamide core and ethynyl spacers.
The metallarectangles were characterized by multinuclear NMR, electrospray
ionization mass spectrometry, and UV–vis spectroscopy,
and the molecular structure of <b>4</b> was unambiguously determined
by single-crystal X-ray diffraction analysis. Because of the presence
of an extended π-electron aromatic surface, the tetracene-containing
molecular rectangle <b>5</b> was capable of binding C<sub>60</sub> and C<sub>70</sub> fullerenes as quantified by UV–vis, emission,
and <sup>1</sup>H NMR experiments, providing an example
of a supramolecular host capable of recognizing large guest molecules