Cluster lanthanide clusters

Kornienko A, Emge TJ, Kumar GA, Riman RE, Brennan JG (2005) Lanthanide clusters with internal Ln ions Highly emissive molecules with sohd-state cores. J Am Chem Soc 127 3501-3505... 

Kornienko AY, Emge TJ, Brennan JG (2001) Chalcogen-rich lanthanide clusters Cluster reactivity and the influence of andllary ligands on structure. J Am Chem Soc 123 11933-... 

We can see so many lanthanide clusters behave as efficient SMMs in those p -O-fixed complexes. Especially, the energy barrier record (530 K) for polynuclear lanthanide SMMs, held by the p5-0-fixed Dy5 with a square-based pyramid, has not been broken by the end of 2013. Such a structural characteristic should support the isolation of a robust SMM to a great extent, which provides a change to explore new methods for achieving SMMs with high barriers. 

A deeper analysis [80] on this Cu - Dy chain showed that NN and NNN interactions are efficient above Tc and that inter spin-ladder ferromagnetic interaction is observed in this family of compounds [79-82]. Attempts were made to use the 3d tectons with other lanthanide precursors, such as hexanuclear lanthanide clusters. Regular chains were obtained with Dy-Cu ferromagnetic interaction but their close packing prevents observation of SCM behaviour [83]. 

Amino acid is one of the most important biological ligands. Researches on the coordination of metal-amino acid complexes will help us better understand the complicated behavior of the active site in a metal enzyme. Up to now many Ln-amino acid complexes [50] and 1 1 or 1 2 transition metal-amino acid complexes [51] with the structural motifs of mononuclear entity or chain have been synthesized. Recently, a series of polynuclear lanthanide clusters with amino acid as a ligand were reported (most of them display a Ln404-cubane structural motif) [52]. It is also well known that amino acids are useful ligands for the construction of polynuclear copper clusters [53-56], Several studies on polynuclear transition metal clusters with amino acids as ligands, such as [C03] [57,58], [Co2Pt2] [59], [Zn6] [60], and [Fe ] [61] were also reported. 

Constants of Small Transition Metal and Lanthanide Clusters. 

Kajiwara, T, Katagiri, K., Hasegawa, M., Ishii, A., Eerbinteanu, M., Takaishi, S. et al. (2006) Conformation-controlled luminescent properties of lanthanide clusters containing p-tert-butylsulfonylcalix[6]arene. Inorganic Chemistry, 45, 4880-4882. 

Kajiwara, T, Iki, N., and Yamashita, M. (2007) Transition metal and lanthanide cluster complexes constmcted with thiacahx[n]arene and its derivatives. Coordination Chemistry Reviews, 251, 1734-1746. 

Zheng, Z. and Wang, R. (2000) Assembling lanthanide clusters under physiological or higher pH-conditions. Comments on Inorganic Chemistry, 22, 1-30. 

Wang, R., Song, D., and Wang, S. (2002) Toward constructing nanoscale hydroxo-lanthanide clusters syntheses and characterizations of novel tetradecanuclear hydroxo-lanthanide clusters. Chemical Communications, 368-369. 

Wang, R., Carducci, M.D., and Zheng, Z. (2000) Direct hydrolytic route to molecular oxo-hydroxo lanthanide clusters. Inorganic Chemistry, 39, 1836-1837. 

The first evidence that valence changes can be precipitated in this way for lanthanide clusters was obtained by Liibcke et al. [694] for clusters of... 

Not all the subclasses of lanthanide clusters have been developed equally. For some systems, reviews with comprehensive coverage of the subject are already available (Arndt and Okuda, 2002 Boyle and Ottley, 2008 ... 

It is clear from the chemistry of lanthanide clusters based on aryloxide ligands that lanthanide coordination chemistry can be further developed by having recourse to other fimctionalized aryloxide ligands. In this context, the use of constrained, macrocyclic polyaryloxide ligands such as calixarenes or their sulfur-containing analogues appears intriguing. 

Reduction of dinitrogen molecule by divalent lanthanide complexes has been a popular subject in coordination and organometallic chemistry of the lanthanide elements. In the course of these studies, a large number of polynuclear lanthanide clusters featuring a core of lanthanide atoms organized around a dinitrogen unit have been obtained and structurally characterized. 

LANTHANIDE CLUSTERS OBTAINED UNDER HYDROLYTIC CONDITIONS... 

Tetranuclear lanthanide clusters of general formula R4(/i3-OH)2(/r, / -acac)6( -acac)4 (R = Y, Nd acac = acetylacetonate) have also been obtained, but by rather different procedures (Barash et al., 1993 Poncelet and Hubert-Pfalzgraf, 1989). The neodymium cluster was... 

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