학술논문
Molecular Recognition of Carbonyl Compounds by Uranyl-salophen Based Neutral Receptors Driven by Van Der Waals Forces.
Document Type
Article
Author
Source
Subject
*MOLECULAR recognition
*CARBONYL compounds
*URANYL compounds
*VAN der Waals forces
*FOURIER transform infrared spectroscopy
*KETONES
*VOLUMETRIC analysis
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Language
ISSN
1061-0278
Abstract
The complexation of the salophen-uranyl metallocleft 2 and of its half-cleft analogue 3 with enones and other carbonyl compounds was assessed in chloroform by UV-Vis titration and, occasionally, by FT-IR measurements. Complexes with receptors 2 and 3 are in all cases more stable than those with the control unsubstituted uranyl-salophen 1 , showing that in addition to the primary binding force provided by coordination of the carbonyl oxygen to the uranium, a significant driving force for complexation, typically in the range of 2-3 kcal/mol, results from van der Waals interactions of the guest with the aromatic walls. Replacement of the phenyl group in 3 with larger aromatic residues to give 4 and 5 , led to enhanced complex stabilities, due to more extended contact surfaces between host and guest. [ABSTRACT FROM AUTHOR]