Isostructural system

Figure 4 Stereoview of crystal packing diagram showing molecular (small arrow) and net dipole moment (large arrow) vectors for the isostructural systems 3...

Fig. 37. The QE linewidth of YbMCu4 systems as function of temperature. The solid circles for YbAgCu4 correspond to an analysis with a quasielastic line only, whereas the open circles give the width assuming an inelastic contribution (see text). The triangles and squares represent the isostructural systems with M = Au and Pd, respectively. (From Severing et al. 1990a.)...

In the Li-Rh system LiRh is prepared from rhodium metal foil and liq Li in a 25 at% excess of the 1 1 molar ratio. The mixture is heated in an iron crucible to 750-880°C in Ar. The direct reaction of the elements in a molybdenum crucible at 800°C for 7 d produces LiRh. Identical methods produce Lilr and Lilrj with which the rhodium compounds are isostructural . The reaction of Rh metal with LiH at 600°C gives the ternary hydrides Li4RhH4 and Li4RhH5. 

The best known boron-containing ring systems are the so-called inorganic benzenes, namely, borazine (71), boroxine (72), and triphosphatriborin (73) (Fig. 46), which are isoelectronic and isostructural with benzene. These ring systems are obtained by the interaction of boron with nitrogen, oxygen, and phosphorus, respectively.4... 

An unusual pH dependence has been reported for the Gd111 complex of a tetraamide-based ligand with extended noncoordinating phosphonate side chains (Scheme 12).169,170 The relaxivity increases from pH 4 to 6, followed by a decrease until pH 8.5, then from pH 10.5 it increases again. The system, as well as isostructural lanthanide complexes, was characterized by various techniques such as 31P and 170 NMR and fluorescence measurements. The pH dependence could be attributed to protonation equilibria of the noncoordinating phosphonate groups, which can... 

Three (or four, see following text) additional coordination bonds are established with two solvent molecules (pyridine, H20) and the anion X- (Cl- or N03-). The good behaviour of this reaction system led to the preparation and crystallographic characterization of a comprehensive quasi-isostructural series of... 

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