Högberg compounds with a functionalized box-like cavity

Preparations of the Högberg compounds (Ia–e) with functionalized box-like cavities, designed for complexation of soft cations like silver and copper(II), are described. The structure of1a was determined by X-ray analysis.This paper is dedicated to the memory of the late Dr C. J. Pedersen.     

The mechanism of the formation and hydrolysis of cyclohexanone oxime in aqueous solutions

The rate of formation of cyclohexanone oxime from cyclohexanone and hydroxylamine and the rate of the reverse reaction, the hydrolysis of cyclohexanone oxime, were studied in the pH range 1–7. The relative position and the bell shape of the two experimental reaction-rate curves can be fully explained by supplementing the reaction mechanism proposed by Jencks for the oximation only with the reverse reaction, applying the principle of microscopic reversibility. An essential part of this mechanism is the intermediate formation of a 1:1 adduct of cyclohexanone and hydroxylamine. It is concluded that the concentration of this adduct is negligibly small under all the conditions used here.     

FTIR Emission Spectra, Molecular Constants, and Potential Curve of Ground State GeO

Extensive new high-temperature, high-resolution FTIR emission spectroscopy measurements for the five common isotopomers of GeO are combined with previous diode laser and microwave measurements in combined isotopomer analyses. New Dunham expansion parameters and an accurate analytical potential energy function are determined for the ground X1Sigma+ state. Copyright 1999 Academic Press.     

Metal–Organic Frameworks (MOFs) as Multivalent Materials: Size Control and Surface Functionalization by Monovalent Capping Ligands

Control over particle size and composition are pivotal to tune the properties of metal organic frameworks (MOFs), for example, for biomedical applications. Particle‐size control and functionalization of MIL‐88A were achieved by using stoichiometric replacement of a small fraction of the divalent fumarate by monovalent capping ligands. A fluorine‐capping ligand was used to quantify the surface coverage of capping ligand at the surface of MIL‐88A. Size control at the nanoscale was achieved by using a monovalent carboxylic acid‐functionalized poly(ethylene glycol) (PEG‐COOH) ligand at different concentrations. Finally, a biotin–carboxylic acid capping ligand was used to functionalize MIL‐88A to bind fluorescently labeled streptavidin as an example towards bioapplications.