Tetrakis-μ-L-alanine-κ⁸O:O′-bis[tetraaquaterbium(III)] hexaperchlorate

Abstract

The surname of one of the authors and the affiliation of that author in the paper by Mohamed et al. [Acta Cryst. (2009), E66, m193-m194] are corrected. In the paper by Mohamed et al. (2009), the surname of one of the authors is incorrect, viz. Venugopal should appear as Venugopala, and the affiliation of the same author should be

Luminescent probing of the simplest chiral α‐amino acid–alanine in an enantiopure and racemic state

“…Lanthanides can form polynuclear complexes including infinite chains where the carboxylate group plays the role of a bridge. In particular, gadolinium, europium, and terbium tripositive ions form dimeric complexes: [Gd 2 (Ala) 4 (H 2 O) 8 ](ClO 4 ) 6 (handedness of alanine has not been specified), [Eu 2 (Ala) 4 (H 2 O) 8 ](ClO 4 ) 6 (both L and DL forms have been described), and [Tb 2 (L‐Ala) 4 (H 2 O) 8 ](ClO 4 ) 6 , where four zwitterionic alanine ligands link two Ln 3+ ions via oxygen atoms of the carboxylate group (mode I) . Studies on the alanine and other amino acids complexation with UO 2 2+ in aqueous solutions indicate that [UO 2 (Ala) 2 (H 2 O) x ] 2+ species are present in the equilibrium mixture .…”

“…Transition metals including rare earth metals are able to form a diversity of complexes with organic compounds bearing groups that are Lewis bases. Alanine is not an exception, and a number of its complexes with lanthanides [14][15][16][17][18][19] and actinides [20][21][22] have been reported. Three main types of complexation between amino acids and lanthanides are known ( Figure 2).…”

Compounds of Amino Acids and Neutral Salts

“…The structure is isotypic with its terbium analog as published later by Mohamed et al (2010), who measured the structure at 100K. Glowiak et al (1996) a These space groups are incorrectly assigned; the correct space group is P1 for all these salts.…”

Crystal structures of amino acids: from bond lengths in glycine to metal complexes and high-pressure polymorphs

“…Figure 41(d) shows an l-Ala Tb(III) complex (DUMCEU) [185] as an example of a special group of coordination compounds involving rare-earth metals, where four amino acids interact with two metal ions to form a well-defined cluster, here with an overall charge of 6+ (perchlorate anions are not shown). Alternatively, metal ions may link the amino acids into chain polymers.…”

“…[183] (c) (η 6 -l-Tyr)-(η 5 -cyclopentadienyl)-Ru(II) sandwich complex (BACQUT) [184] where the amino acid is in the c(1) state. (d) Four zwitterionic l-Ala molecules and eight water molecules interacting with two Tb(III) (DUMCEU), [185] 1 of 20 complexes of this type where rare-earth metals have square antiprismatic coordination geometry. Finally, bidentate binding may be realized through κ 2 coordination of a carboxylate group, resulting in a four-membered ring system.…”