Synthesis and crystal structural characterization of an unsymmetric neodymium(III) cryptate

Novel highly symmetrical cube-shaped cation with 16-nitrogen donors

“…An even greater dispersion is observed for the N…O distance range of the twelve endo nitrogen atoms from 2.82 to 3.22 Å, with an average N…O separation of about 3.0 Å. These separations are comparable to those found for the N…O hydrogen bonds present in the crystal structure of the NH 4 + complexes of macrotetrolide antibiotics (2.83-2.93 Å), 10 18-crown-6 (2.86-2.88 Å), 11 and some H 3 O + complexes of nitrogencontaining crypts, 12 indicating potential hydrogen bonding between the nitrogen atoms of the host and the included water molecules. Since the host is a protonated ion, and the angles of N( 5)-H(5C)…O(1W), N(11)-H(11C)…O(1W) and N( 13 9) are 178°, 167° and 166°, indicating typical O-H…N hydrogen bonding of the water molecules and substantial contact with the host.…”

“…The cage is slightly deformed from expected T d symmetry (Fig. 1) with four bridge head nitrogen atoms of tris(2-aminoethyl)amine [N(1), N (11), N (12), and N(13) ] and four six-membered [N(CH 2 )] 3 rings occupying the vertex positions, and the twelve CH 2 CH 2 chains along the edges. In addition to its chemical interest, such a host has aesthetic appeal.…”

Spectral and magnetic properties of macroacyclic and macrobicyclic Schiff base RE complexes

“…The coordination geometry in the complexes is different and depends on the coordination number, the complex type and the counterion kind (e.g. eight-coordinated Eu 3+ complexes are distorted dodecahedrons [14] while the coordination geometry for nine-coordinated Nd 3+ and Dy 3+ complexes is a monocapped-square antiprismatic and monocapped-dodecahedron, respectively [16,17].…”

Assembly and Photophysics of Ternary Luminescent Lanthanide Molecular Complex Systems

“…[4][5][6] A variety of research has been reported on the energy transfer mechanism and luminescence of lanthanide complexes with b-diketones, aromatic carboxylic acid, and heterocyclic compounds, which have good energy matches and are suitable for the luminescence of lanthanide ions. [7][8][9][10] We also have studied the energy match and intramolecular energy transfer mechanism of lanthanide complexes with aromatic carboxylic acids and 1,10-phenanthroline in detail. [11][12][13][14] In this context, according to the molecular fragments principle, using heterocycle compounds (1,10-phenanthroline and 2,2¢-bipyridine) as the energy donor and luminescence sensitizer for lanthanide ions and a-methylacrylic acid molecules as the terminal structural ligands, a series of eight ternary lanthanide (Eu 3+ , Tb 3+ , Sm 3+ , Dy 3+ ) complexes systems were assembled.…”