Dynamic NMR study of the hindered Pt-N(bipyridine) rotation in metal-directed self-assembled macrocycles.
[reaction: see text] The activation parameters for the hindered Pt-N(bipyridyl) rotation observed for a self-assembled rectangle and triangle have been investigated by temperature-dependent and selective inversion recovery (SIR) NMR spectroscopy. The enthalpy of activation (DeltaH) and change in entropy (DeltaS) were determined to be +52.2 kJ/mol and -58.2 J/mol.K for the rectangle and +59.1 kJ/mol and -71.8 J/mol.K for the triangle, respectively, by SIR.
Tárkányi
Gábor
G
Chemical Research Center of the Hungarian Academy of Sciences, Institute of Structural Chemistry, Budapest. gtarkanyi@chemres.hu
Jude
Hershel
H
Pálinkás
Gábor
G
Stang
Peter J
PJ
D047028:Macrocyclic Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D010984:Platinum / Q000737:chemistry*; D011743:Pyrimidines / Q000737:chemistry*; D013696:Temperature; D013816:Thermodynamics
D047028:Macrocyclic Compounds; D011743:Pyrimidines; D010984:Platinum