Discrete Quadruple\nStacks Formed in a Nanosized Metallorectangle

An iridium-cornered nanosized metallorectangle was obtained\nby\ncombining a quinoxalinophenanthrophenazine-connected Janus-di-imidazolylidene\nligand and 4,4′-bipyridine. This metallorectangle was used\nas host for a series of planar molecules, including pyrene, triphenylene,\nperylene, coronene, and N,<i>N</i>′-dimethyl-naphthalenetetracarboxy-diimide\n(NTCDI). The binding of coronene and NTCDI followed a strongly positive\ncooperative 1:2 stoichiometric binding model, as the inclusion of\nthe first guest generates the geometrical requirements for the optimum\nencapsulation of the second planar molecule. The simultaneous encapsulation\nof coronene and NTCDI produces a heteroguest inclusion system, whose\nexchange dynamics was studied by means of variable temperature <sup>1</sup>H NMR spectroscopy.