Mainz group

Our understanding of the intricacies of anionic polymerization of methyl methacrylate was greatly improved during the last 15years by the meticulous and persistent work of the Mainz group. To appreciate fully the progress made in this field it is advisable to summarize the older studies and the ideas developed in those days. 

The third assumption has been verified by the Syracuse and Mainz groups (2, 3). From these three assumptions, we have for comparatively large a... 

In collaboration with the Mainz group, Parma University workers synthesized CMPO-calix[6]arenes CP64 and CP65, bearing three CMPO binding sites onto the narrow and wide rim, respectively. CP65 and to a lesser extent CP64 display relatively low distribution ratios and a selectivity SAm/Eu lesser than 2.5.18... 

Orsay and Mainz groups constitute a main effort in this direction. Certainly, these experiments profit from the excellent performance of the ISOLDE mass-separator and from the wide range of elements available in high production yields [RAV79, RAV84]. 

Nuclear properties (spins, moments, charge radii) revealed by the analysis of hyperfine structure and isotope shift of atomic levels have been obtained in decades of experiments. Since 1975 with the introduction of tunable dye laser, the rebirth of the methods, some already known since 1930, had led to many on line experiments on short lived isotopes not investigated before. I report here a sample of the experiments done by the Orsay, Mainz groups at CERN. Although experiments have been carried out by the Orsay group using the proton beam of the CERN Proton Synchrotron, most of the experiments have been done at Isolde, the on - line mass separator at CERN, whose radioactive beams are essential to the success of these experiments [RAV 84]. 

The experiments of the Mainz group were performed by R. Ley, K.D. Niebling and A. Schwarz and were supported by the Deutsche Forschungs-gemeinschaft. The author enjoyed conversations about the subject with A. Rich, V. Telegdi and C. Westbrook during the symposium on "The Hydrogen Atom" at Pisa, 1988. 

The Mainz group, specialised in chromatography, developed a reproducible and rugged synthesis of monodispersed, spherical silica particles that exhibit mesoporosity. 

The success of the Mainz group certainly deserves an extra paragraph. The consequent application of H-1D experiments and the development of nD methods represent... 

Combined SmC LCPs were particularly studied in the late 1980s, mainly by the Mainz group [58-61], They all derive from a substituted polymalonate obtained by step-growth polymerization (Fig. 8). The occurrence of SmC with broad temperature ranges was quite easily obtained with this class of compound. It seems that combined polymers are still prepared to obtain SmC elastomers [62]. 

The ionization potential of an element is one of its fundamental properties. It is known that the first ionization potential of heavy elements depends on relativistic effects. The Mainz group, in Germany, systematically determined the first ionization potential of the actinide elements from Ac through Es using laser spectroscopy as shown in Table 18.12 (Becke et al. 2002). O Figure 18.24 shows the comparison of ionization potentials between lanthanide and actinide atoms (Moore 1971 Becke et al. 2002). The atomic level structure of Fm (2.7 x 10 ° atoms) with a half-life of 20.1 h was studied for the first time by the method of resonance ionization spectroscopy. Two atomic levels were identified at wave numbers (25,099.8 0.2) cm and (25,111.8 0.2) cm (Sewtz et al. 2003). 

Figure 6.5. C NMR spectra of poly(2,5-di- -hexyl-pheny-lene) prepared according to (a) the Yamamoto and (b) the Mainz group procedure with assignments of the signals (Reprinted with permission from refs. 53,73).

---