CH...pi interaction for rhenium-based rectangles: an interaction that is rarely designed into a host-guest pair.
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.
Manimaran
Bala
B
Institute of Chemistry, Academia Sinica, Taipei 115, Taiwan.
Lai
Liang-Jian
LJ
Thanasekaran
P
P
Wu
Jing-Yun
JY
Liao
Rong-Tang
RT
Tseng
Tien-Wen
TW
Liu
Yen-Hsiang
YH
Lee
Gene-Hsiang
GH
Peng
Shie-Ming
SM
Lu
Kuang-Lieh
KL
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
D009942:Organometallic Compounds; D011721:Pyrenes; D011725:Pyridines; D013438:Sulfhydryl Compounds; D012211:Rhenium; D012835:Silver Nitrate