Novel Alkoxo-Bridged Lanthanide(III) Dinuclear Complexes: Crystal Structure of Na4[Yb2(μ-dpta-O)2] (H4dpta-OH=1,3-Diamino-2-hydroxypropane-N,N,N′,N′-tetraacetic acid)

Abstract

Novel alkoxo-bridged lanthanide(III) dinuclear complexes Na4[Ln2(μ-dpta-O)2] (Ln=GdIII, HoIII, and YbIII; H4dpta-OH=1,3-diamino-2-hydroxypropane-N,N,N′,N′-tetraacetic acid) were prepared and characterized. X-ray analysis for the Yb(III) complex indicated that each Yb atoms, which is surrounded by four terminal O atoms from carboxylate, two bridged O atoms from alkoxo, and two N atoms in two different dpta-O ligands, is situated in an eight coordinate geometry.

Selective formation of lanthanide(III) complexes with polyaminopolycarboxylate: Unprecedented tetranuclear neodymium(III) complex containing alkoxo and carboxylato bridges

“…These are consistent with the results of ICP analyses, which gave a value of Nd:Na = 1:2. The molar conductivity in water (397 S cm 2 mol À1 ) is fairly in agreement with those of the 1:4 electrolytes [5]. In the crystal, the Na(I) ions have a hexacoordinate geometry and the average Na-O distance is 2.43(1) Å .…”

“…Each Nd atom in 1 is coordinated by four O c , two bridging alkoxo O (l-O a ), one O w atoms, and two N atoms in two dptaO ligands, and is situated in a nonacoordinate geometry. Consequently, the Nd(III) complex 1 is similar to the corresponding Ho(III) and Yb(III) complexes except the coordinated H 2 O molecules [5]. It is considered that the structural difference between these complexes are caused by lanthanide contraction.…”

“…Among them, 2-hydroxypropane-1,3-diamine-N,N,N 0 ,N 0 -tetraacetic acid (H 4 dptaOH) is recognized as a potentially heptadentate dinucleating ligand. When early transition metal or lanthanide (Ln) metal ions, whose ionic radii are relatively large, were used, homoleptic complexes were obtained [2][3][4][5]. Previously, we have reported the late Ln(III) dinuclear complexes, Na 4 [Ln 2 (l-dptaO) 2 ] (Ln = Ho III , Yb III ) [5], which contain octacoordinate Ln(III) ions.…”

“…When early transition metal or lanthanide (Ln) metal ions, whose ionic radii are relatively large, were used, homoleptic complexes were obtained [2][3][4][5]. Previously, we have reported the late Ln(III) dinuclear complexes, Na 4 [Ln 2 (l-dptaO) 2 ] (Ln = Ho III , Yb III ) [5], which contain octacoordinate Ln(III) ions. In this work, we used Nd(III) ion as an early Ln(III) ion, which is expected to take a nonacoordinate geometry.…”

Crystal structure and temperature-dependent luminescence of a heterotetranuclear sodium–europium(iii) β-diketonate complex

“…A less related complex was described by Miyashita et al based on a flexible organic ligand and Na + cations. 7 This complex is, however, polymeric by way of bridges involving the Na + cations and neighbouring lanthanide dimeric cluster.…”