Ruthenium–Cobalt
Bimetallic Supramolecular
Cages via a Less Symmetric Tetrapyridyl Metalloligand and the Effect
of Spacer Units
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Abstract
The
self-assembly of <i>C</i><sub><i>s</i></sub>-symmetric
tetrapyridyl cobalt–metalloligand <b>2</b> with three half-sandwich diruthenium acceptors, <b>3</b>–<b>5</b>, led to the formation of A<sub>4</sub>D<sub>2</sub> (A = acceptor, D = donor) metallacages <b>6</b>–<b>8</b>, as shown by ESI mass spectrometry, NMR spectroscopy,
and X-ray crystallography. The solid-state structures of <b>6</b>–<b>8</b> revealed that the length of the acceptor unit
greatly influences the molecular packing of these metallacages.
Hence, in the solid state, <b>6</b>–<b>8</b> can
be considered to have waterwheel-shaped, tweezer-shaped, and
butterfly-like architectures, respectively
