Heterometallic systems

Another type of lanthanide-containing magnetic materials are 4f-3d/4d heterometallic complexes, which have attracted much attention as part of the tremendous development of molecular magnetism [2, 3]. 

so far not many 3D-magnetic ordered lanthanide-based molecular materials have been obtained. However, the existing examples, including the lanthanide-radical systems and lanthanide-transition metals, provide us with much experimental and theoretical knowledge and experience. The research into 3D-magnetic ordered lanthanide-based molecular materials is still an open subject for chemists and physicists. 

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The thermally stable tripodal tris]amido)methalates of the group 14 element can act as metal building blocks [239, 240] in the synthesis of heterometallic systems... 

This becomes a sum when we are considering a heterometallic system. In reality, there are several factors why this theoretical maximum may not be attainable, such as anisotropy or the magnetic field being too small. 

The heterometallic system [(bpy)2Ru(234)] exhibits several intramolecular energy-transfer processes (i) ultrafast singlet-to-singlet transfer, (ii) fast triplet-to-singlet transfer and (iii) singlet-to-triplet transfer. Excitation into the Ru(bpy)3 " " domain is followed by rapid energy transfer to the triplet state of the Zn(porphyrin) fragment. There is no evidence for intramolecular electron transfer between the Ru(bpy)3 and Zn(porphyrin) units. 

Here the discussion will be limited to heterometallic systems in which the metal is linked to nitrogen, oxygen, sulfur and phosphorus donor atoms predominantly. Ligand reactions range from some very simple and almost trivial examples to complicated and sophisticated processes involving many steps. The coverage in this essay will be selective and will depend upon the type of reaction mechanisms either known to occur or reasonably supposed to take place. 

G. A. Stone, E. W. Abel, eds., Pergamon Press, Oxford, 1982, Ch. 40 although confined to heterometallic systems, a good general discussion of synthetic methods for polynuclear carbonyl anions. 

This section begins a systematic treatment of specific structure types within the uranyl-CP system. Our presentation is limited (initially) to only those materials containing hexavalent uranium occurring as the U02 cation. The compounds are categorized based on the type of functional group found on the organic linker molecules. This will be expanded to include heterometallic systems and ultimately a few non-uranyl and non-CP examples included for perspective. 

Heterometallic systems employ multiple building units to produce extended structures. Building units in this case will refer to two distinct metal centers such as a transition metal in addition to the uranyl cation. The net result... 

Extending the Mon -based Principle to More Complex Heterometallic Systems with (Mo) (Mo5) (M 5)° Motifs. 223... 

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