1987
New At(I)-complexes for nuclear medicine ;1987), open-chain thiacrown ethers as well as phosphorous-containing ligands proved to be strong ligands for At(I) cations, the stable complexes may be applied for cancer treatment by the short-lived isotope At-211 in Nuclear Medicine.
 

1991
Molecular co-extraction process of  Ln³⁺ and Na⁺(1991) / Am³⁺ and K⁺ (1994)
So far, ‘co-extraction’ described the extraction of two metal ions by one type of ligand. Another known phenomenon is the extraction of metal ions coordinated to two different kinds of ligands. New is the extraction of two different metals (as ions) by one ligand molecule, thus creating a supramolecular complex. This effect was first detected with calix[4]arenes and Ln³⁺/ Na⁺, where it leads to improved mutual Ln(III)-separation. It was later confirmed for Am³⁺/Na⁺, and for larger metacyclophanes and Am³⁺/K⁺. So, the selectivity towards f-elements can me modulated by adding alkali salts.
 

1992
Coupling of Langmuir-Blodgett and mass spectroscopy for stoichiometric determinations
The stoichiometry of a saccharide-phenylboronic acid complex in bulk solution can be determined by conventional methods. The complex as arranged as mono-molecular film at the air-water-interface however, differs in its stoichiometry from that of the bulk phase. To determine the stoichiometry unequivocally, MS was coupled with Langmuir-Blodgett film for the first time.
 

1992
Sensitized molecular saccharide assemblies at interfaces
Saccharides are covalently bound (or ‘complexed’) by boronic acids.  This esterification reaction usually requires a basic pH to occur. It was shown by the author that a neutral pH is sufficient, when the boronic acid (a phenylboronic acid) is co-assembled as a mixed monomolecular film with amines at the air-water interface. This assembly binds sugars strongly at pH 7, or in other words, at neutral pH the sugar recognition becomes much more sensitive.
By assembling phenylboronic acids as monolayers, the chiral discrimination of saccharides is possible.

By applying polycations in the subphase, a similar effect results.
 

1993
Energy transfer in monolayers
Applying fluorescence emission coupled with UV-reflection spectroscopy of monolayers at the air-water interface the author has shown that the energy transfer from an excited macrocyclic ligand to the encapsulated rare earth ion can be modulated by the surface pressure with which the monolayer is compressed. As a result, the emission spectra change with the compression and differ  from those in homogeneous solutions. This may be applied for luminescence detection.
 

1997
Separation process Am³⁺/Ln³⁺ for analyt. purpose (1997, 2000 improved)
The separation of trivalent actinides from lanthanides is a challenge for the chemist. Only in recent years strategies were developed by various groups, such as dithiophosphinic acids, nitrogen-containing ligands, CMPO-derivatized calixarenes, and calix[6]arenes with mixed functional groups. The latter give separation factors in the range of 65 (Nd/Am) and 110 (Am/Eu).  Recent improvements aimed at the better extraction from strongly acidic media while keeping the selectivity.
 

1998
Coupled transport between anion and cation in solvent extration, monitored as via the refractive index gradient changes in the system UO₂²⁺ /TcO₄^- by using analytical ultracentrifugation (98/99);.
By applying the synthetic boundary double sector type centerpiece, the overlapping between diffusion- and reaction-controlled chemical transport was confirmed by applying a mathematical model.
 

1994-2001
Developed over 50 new calixarene derivatives with emphasis on mixed functional groups engaging in cooperative binding
 

Where to buy calixarenes in larger quantities