CH⋯π interaction for rhenium-based rectangles: An interaction that is rarely designed into a host-guest pair
Journal
Inorganic Chemistry
Journal Volume
45
Journal Issue
20
Pages
8070-8077
Date Issued
2006
Author(s)
Manimaran, B.
Lai, L.-J.
Thanasekaran, P.
Wu, J.-Y.
Liao, R.-T.
Tseng, T.-W.
Liu, Y.-H.
Lee, G.-H.
Lu, K.-L.
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.
Type
journal article