Novel three-dimensional network of lanthanum(III) complex {[La2(BTA)6(4,4′-bpdo)1.5]·1.5H2O}n (BTA=benzoyltrifluoroacetone; 4,4′-bpdo=4,4′-bipyridine dioxide)

Spectroscopic Study of a UV‐Photostable Organic–Inorganic Hybrids Incorporating an Eu3+ β‐Diketonate Complex

“…Among all the known materials containing lanthanide centres coordinated to btfa-type ligands, [53][54][55][56][57][58][59][60][61] the structure reported by Batista et al, [56] [Eu-(btfa) 3 (2,2'-bipy)] (where 2,2'-bipy stands for 2,2'-bipyridine), shares several similarities with both complexes reported herein. In all structures the three btfa anionic ligands are bound to the Ln 3 + centres, thus leaving two vacant adjacent positions: in [Eu-(btfa) 3 (2,2'-bipy)] these two positions are fully occupied by the chelating 2,2'-bipy organic ligand, whereas in I and II one coordinating position is occupied by the 4-pyridyl group of 4,4'-bpy and the other by the hydroxyl group of the ethanol moiety ( Figure 2).…”

“…The geometry resembles a highly distorted square antiprism (Figure 2b), with the "square" opposite planes of the polyhedron being defined by O(1)···O (2)···O (3)···O (4) and O(5)···O(6)···O(7)···N(1). Remarkably, as revealed by a search in the Cambridge Structural Database (CSD, version 5.25, November 2003), [51,52] there are only a handful of structures containing the chelating btfa-type anionic ligand coordinated to lanthanide centres, [53][54][55][56][57][58][59][60][61] and even fewer if a pyridyl aromatic ring is included in the first coordination sphere (interestingly, all contain Eu 3 + cations). [55,56,58] Notably, complex II constitutes the first example of a complex containing btfa-type anionic organic ligands coordinated to Gd 3 + metal centres.…”

New Approaches to the Analysis of High Connectivity Materials: Design Frameworks Based upon 44- and 63-Subnet Tectons

“…In all but one of the lanthanide−4,4‘-bipyridine- N , N ‘ - dioxide compounds considered in this Account, the ligand acts as a μ 2 -bridge as shown in Scheme . In the exception, 4,4‘-bipyridine- N , N ‘ - dioxide acts as a μ 4 -bridging ligand. Other structures also exist in which other N , N ‘ - dioxides act as μ 3 - or μ 4 -bridging ligands to link Ln(III) centers. − The Ln 3+ −oxygen donor combination is effective in framework construction owing to the complementarity of the hard metal cationic acid and hard donor base.…”

Syntheses, crystal structures and luminescence of two isostructural coordination polymers constructed from 4,5-imidazoledicarboxylate

“…The differences between as (OCO) and s (OCO) for 1 are 224(184) cm À1 and for 2 are 219(207) cm À1 , indicative of carboxylate in unidentate coordination [17], consistent with the crystal structures. In addition, for free 4,4 0 -bipyO, (N-O) is 1241 cm À1 , whereas when coordinated to Co(II) or Zn(II), it shifts to 1177 cm À1 [18]. For the two compounds, the difference in the extent of the ligand conformational rigidity due to coordination to different metal ions exerts little influence on their stretching modes.…”