Dysprosium complexes, reaction with

Neutral bis-and tris-gadolinium complexes of the oligomeric ligands have been obtained in the usual manner with gadolinium oxide and the corresponding dysprosium complexes by reaction with dysprosium oxide The latter might be useful as X-ray contrast agents. 

Attempts to liberate the diiminoamine ligand from the dysprosium complex by pyrolysis imder vacuum at 195 °C resulted in the isolation of 2,3/5,6-tetramethylpyrazine. A tetraphenylpyrazine was obtained together with 2,4,6-triphenyltriazine and 2,4,5-triphenylimidazole in the reaction of Tml2, Dyl2 and Ndl2 with benzonitrile followed by hydrolysis (Balashova et al., 2004). 

Clean reactivity with dysprosium(II) complexes was difficult to obtain. For instance, no complex could be crystallised from the reaction of [(l,2,4-fBu3C5H2)2Dy(/i-BH4)K([18]crown-6)] with diphenylacetylene however, after hydrolysis, (E,E)-l,2,3,4-tetraphenylbuta-l,3-diene was isolated. This compound most likely results from Dy"-initiated reductive coupling of diphenylacetylene. When [(l,2,4-fBu3C5H2)2Dy(/i-BH4)K([18]... 

In Chapters I and 2, an introduction is made to the synchrotron Mossbauer spectroscopy with examples. Examples include the/ns/tu Mossbauer spectroscopy with synchrotron radiation on thin films and the study of deep-earth minerals. Investigations of in-beam Mossbauer spectroscopy using a Mn beam at the RIKEN RIBF is presented in Chapter 3. This chapter demonstrates innovative experimental setup for online Mossbauer spectroscopy using the thermal neutron capture reaction, Fe (n, y) Fe. The Mossbauer spectroscopy of radionuclides is described in Chapters 4-7. Chapter 4 gives full description of the latest analysis results of lanthanides Eu and Gd) Mossbauer structure and powder X-ray diffraction (XRD) lattice parameter (oq) data of defect fluorite (DF) oxides with the new defect crystal chemistry (DCC) Oq model. Chapter 5 reviews the Np Mossbauer and magnetic study of neptunyl(+l) complexes, while Chapter 6 describes the Mossbauer spectroscopy of organic complexes of europium and dysprosium. Mossbauer spectroscopy is presented in Chapter 7. There are three chapters on spin-state switching/spin-crossover phenomena (Chapter 8-10). Examples in these chapters are mainly on iron compounds, such as iron(lll) porphyrins. The use of Mossbauer spectroscopy of physical properties of Sn(ll) is discussed in Chapter I I. 

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