X-ray diffraction and DOSY NMR characterization of self-assembled supramolecular metallocyclic species in solution.
Wide-angle X-ray scattering and diffusion NMR techniques have been used to obtain structural information on three self-assembled metallacyclic supramolecular complexes in solution: a rectangle, a triangle, and a three-diminsional cage. The low-angle region of the measured diffraction patterns and hydrodynamic radii calculations, determined from DOSY NMR experiments, suggest that the supramolecular assemblies retain their shape when dissolved in nitromethane. The experimental structure functions for the large-angle region have been analyzed, and the intramolecular contributions of the platinum-platinum interactions are discussed. These scattering measurements provide evidence that the supramolecular assemblies are not as rigid in solution as they are in the single crystal. Finally, by analysis of the radial distribution functions of the solutions, direct structural information (e.g., platinum-platinum intramolecular distances and coordination number) about the supramolecular assemblies has been obtained.
Megyes
Tünde
T
Institute of Structural Chemistry, Chemical Research Center, Hungarian Academy of Sciences, P.O. Box 17, Budapest H-1525, Hungary.
Jude
Hershel
H
Grósz
Tamás
T
Bakó
Imre
I
Radnai
Tamás
T
Tárkányi
Gábor
G
Pálinkás
Gábor
G
Stang
Peter J
PJ
D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008958:Models, Molecular; D009944:Organoplatinum Compounds / Q000737:chemistry*; D010984:Platinum / Q000737:chemistry*; D012996:Solutions; D014961:X-Ray Diffraction / Q000379:methods*
D009944:Organoplatinum Compounds; D012996:Solutions; D010984:Platinum