CH...pi interaction for rhenium-based rectangles: an interaction that is rarely designed into a host-guest pair |
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Authors: | Manimaran Bala Lai Liang-Jian Thanasekaran P Wu Jing-Yun Liao Rong-Tang Tseng Tien-Wen Liu Yen-Hsiang Lee Gene-Hsiang Peng Shie-Ming Lu Kuang-Lieh |
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Institution: | Institute of Chemistry, Academia Sinica, Taipei 115, Taiwan. |
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Abstract: | Alkoxy- and thiolato-bridged Re(I) molecular rectangles {(CO)3Re(mu-ER)2Re(CO)3}2(mu-bpy)2] (ER = SC4H9, 1a; SC8H17, 1b; OC4H9, 2a; OC12H25, 2b; bpy = 4,4'-bipyridine) exhibit strong interactions with several planar aromatic molecules. The nature of their binding was studied by spectral techniques and verified by X-ray diffraction analysis. Standard absorption and fluorescence titrations showed that a relatively strong 1:1 interaction occurs between aromatic guests such as pyrene and these rectangles. The results of a single-crystal X-ray diffraction analysis show that the recognition of 1 with a pyrene molecule is mainly due to CH...pi interactions and the face of the guest pyrene is located over the edges of the bpy linkers of 1. This is a fairly novel example of an interaction that is rarely designed into a host-guest pair. Furthermore, the interaction of 1 with Ag+ results in the self-organization of supramolecular arrays, as revealed by solid-state data. |
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