Details

Autor(en) / Beteiligte

• Fox, O. Danny
• Leung, Jenny F.-Y
• Hunter, Jesse M
• Dalley, N. Kent
• Harrison, Roger G

Titel

Metal-Assembled Cobalt(II) Resorc[4]arene-Based Cage Molecules That Reversibly Capture Organic Molecules from Water and Act as NMR Shift Reagents

Ist Teil von

• Inorganic chemistry, 2000-02, Vol.39 (4), p.783-790

Ort / Verlag

United States: American Chemical Society

Erscheinungsjahr

2000

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The complex Co4 1 2 8- is a tetranuclear cobalt(II) cage compound that assembles in aqueous solutions above pH 4 and is capable of encapsulating a variety of organic guest molecules, for example, benzene, hexane, chlorobutane, butanol, and ethyl acetate. Ligand 1 is a resorc[4]arene-based molecule with iminodiacetate moieties appended to its upper rim. 1H NMR studies of Co4 1 2 8-·guest complexes demonstrate inclusion of nonpolar hydrocarbons, substituted phenyls, alcohols, halogen-containing hydrocarbons, and polar organic molecules. The complex Co4 1 2 8- acts as an NMR shift reagent and causes substantial upfield isotropic hydrogen shifts (−30 to −40 ppm) in the guest molecule and separation of the guest hydrogen chemical shifts by typically 12 ppm. The complex Co4 1 2 8- will encapsulate molecules with fewer than eight atoms in a linear chain, mono- and disubstituted benzenes, and polar molecules with greater than two carbon atoms. The solid-state structure of Ba4[Co4 1 2·C6H5C2H5] shows a disordered guest molecule encapsulated within the cavity of Co4 1 2 8-. The cavity dimensions, bond lengths, and bond angles of Ba4[Co4 1 2·C6H5C2H5] are very similar to those determined in Ba4[Co4 1 2·6H2O].