Synthesis, structures, and luminescence properties of ternary supramolecular hydrogen-bonded complexes involving [(o-C6F4)Hg](3), carbazole, and a Lewis base
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The interaction of trimeric perfluoro-ortho-phenylene mercury (1) with carbazole in dichloromethane, THF, and THF/NEt3 leads to the crystallization of [1C12H8NH] (2), [1(C12H8NHTHF)] (3), and [1(C 12H8NHNEt3)] (4), respectively. Adducts 3 and 4 have been characterized by elemental analysis, IR spectroscopy, and luminescence spectroscopy. The crystal structures of 3 and 4 have also been determined. Both adducts have extended structures that exhibit supramolecular binary stacks, where molecules of 1 and the carbazole-Lewis base complex alternate. Short Hg-C contacts involving molecules of 1 and carbazole indicate the presence of secondary Hg- interactions. In addition, adducts 3 and 4 display hydrogen-bonding interactions between the acidic N-H moiety of carbazole and the heteroatom of the Lewis base. The presence of this hydrogen bond is also confirmed by IR spectroscopy, which shows that the N-H of 3 and 4 is lower than that of 2. The luminescence spectra of these adducts correspond to the phosphorescence of carbazole, which is induced by the mercury heavy atom effect. In the case of 3 and 4, additional low-energy bands are observed at 578 and 567 nm. 2007 Wiley Periodicals, Inc.
