title: CH...pi interaction for rhenium-based rectangles: an interaction that is rarely designed into a host-guest pair.
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.
authors.affiliation: Institute of Chemistry, Academia Sinica, Taipei 115, Taiwan.
authors.forename: Bala
authors.initials: B
authors.lastname: Manimaran
authors.forename: Liang-Jian
authors.initials: LJ
authors.lastname: Lai
authors.forename: P
authors.initials: P
authors.lastname: Thanasekaran
authors.forename: Jing-Yun
authors.initials: JY
authors.lastname: Wu
authors.forename: Rong-Tang
authors.initials: RT
authors.lastname: Liao
authors.forename: Tien-Wen
authors.initials: TW
authors.lastname: Tseng
authors.forename: Yen-Hsiang
authors.initials: YH
authors.lastname: Liu
authors.forename: Gene-Hsiang
authors.initials: GH
authors.lastname: Lee
authors.forename: Shie-Ming
authors.initials: SM
authors.lastname: Peng
authors.forename: Kuang-Lieh
authors.initials: KL
authors.lastname: Lu
mesh_terms: D018360:Crystallography, X-Ray; D006860:Hydrogen Bonding; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D011721:Pyrenes / Q000737:chemistry*; D011725:Pyridines / Q000138:chemical synthesis* / Q000737:chemistry; D012211:Rhenium / Q000737:chemistry*; D012835:Silver Nitrate / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet; D013438:Sulfhydryl Compounds / Q000737:chemistry
chemical_list: D009942:Organometallic Compounds; D011721:Pyrenes; D011725:Pyridines; D013438:Sulfhydryl Compounds; D012211:Rhenium; D012835:Silver Nitrate