Ligands lanthanide halides

With the more electropositive metals such as the lanthanides,31 the dissolution of their chlorides into alcohols results only in the formation of solvates such as LaCl3 SPr OH.31 For most of the early J-block elements, only partial replacement of halide ligands occurs on alcoholysis (equations 5 and... 

Because of the low solubilities of lanthanide halides in aliphatic and aromatic solvents catalytic activities of the initially reported binary systems LnCl3/R3 A1 were rather low. Pseudohalogen borohydride ligands [BH4] , sue-... 

Although the bonding in actinide cyclopentadienyls is more covalent than in the corresponding lanthanide complexes, the halide ligand is labile and can be substituted by a large variety of anionic ligands. The synthetic routes most commonly involve metathetical halide substitution (eq. 8), or protolysis of the U-Cp bond (eq. 9). The properties of most of these derivatives have been summarized by... 

Lanthanides. Dicyclopentadienyl lanthanide halides of the lighter lanthanides (La, Ce, Pr and Nd) cannot be isolated due to ligand redistribution reactions. For access to [Cp2LnX] species of the lighter lanthanides, two possible routes have been found ... 

Regardless of the structure (i.e. R, K3 or S ) of the RX3 XAX3 complexes the A-X interaction will decrease the basicity of the ligand coordinated to R in the sequence In > Ga > Al, and thus the intensity of hypersensitive transitions are expected to decrease in the same sequence. The data presented in table 14 and the above discussion support this view, but no definite conclusions about the type of species and their structures can be made. In relation, however, to the proposed structures in fig. 11 the following statements can be made and might be helpful in choosing certain molecular structures for the lanthanide halide vapor complexes ... 

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