Lanthanide complexes polyamines

Solution dynamics of complexes of EGTA (3,12-bis(carboxymethyl)-6,9-dioxa-3,12-diazate-tradecanedioate) have been studied a change in coordination number from 10 to eight is believed to occur across the lanthanide series. " Binuclear La and Y complexes of 9,14-dioxo-l,4,7,10,13-pentaaza-l,4,7-cyclopentadecanetriacetic acid have nine-coordinate lanthanides. Lanthanide polyamine carboxylates and complexes of macrocycles with pendant amide groups show promise as catalysts for RNA cleavage such complexes have considerable stability in aqueous... 

The vast majority of the macrocyclic complexes of the lanthanide(III), yttrium(III) and uranyl ions obtained so far by metal-templated synthesis are of the Schiff-base type even the few known examples of simple polyamine complexes actually result from the cyclic condensation of a diamine with a (modified) carbonyl precursor. In general, the metal-templated synthesis is facilitated by the presence of oxygen-donor anions, such as nitrate, acetate, or trifluoromethylsulfonate lanthanide(III) thiocyanates have also been successfully used. With a few exceptions, the outcome of the synthesis appears to be independent of the order of addition of the reactants. No deliberate attempts have been made to investigate the detailed mechanism of these metal-templated cyclic condensation reactions. 

In this review, we discuss the properties and applications of the complexes between rare earth ions and the following ligand classes coron ds (especially crown ethers and cyclic polyamines), cryptands, and podands. The properties of some complexes with proteins are also presented, in order to illustrate the use of lanthanide ions as spectroscopic probes, but not those pertaining to porphyrin chemistry (with one exception). The papers referred to in this chapter have been found by means of a computer search of Chemical Abstracts up to the end of March 1986. 

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