Influence of the steric properties of pyridine ligands on the structure of complexes containing the {LnCd2(bzo)7} fragment

Шмелев, М. А.; Voronina, Julia K.; Гоголева, Н. В.; Сидоров, А. А.; Кискин, М. А.; Dolgushin, Fedor M.; Nelyubina, Yulia V.; Александров, Г. Г.; Varaksina, Evgenia A.; Taydakov, Ilya V.; Еременко, И. Л.

doi:10.1007/s11172-020-2934-0

Cited by 13 publications

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“…The luminescence properties of the solid-state europium, terbium and gadolinium compounds I-III and V-VIII were studied in detail. The room temperature luminescence spectra of europium (Figure 5) and terbium (Figure 6) samples exhibit narrow f-f bands of the corresponding lanthanide ions as well as weak broad emission bands of d-block that are typical of heteronuclear lanthanide compounds (Figure 7) [37][38][39]. The narrow emission bands of complexes I and VI correspond to the 5 D0→ 7 FJ (J = 0-4) transitions of Eu 3+ (Figure 5).…”

Section: Photoluminescencementioning

confidence: 99%

Molecular and Polymer Ln2M2 (Ln = Eu, Gd, Tb, Dy; M = Zn, Cd) Complexes with Pentafluorobenzoate Anions: The Role of Temperature and Stacking Effects in the Structure; Magnetic and Luminescent Properties

et al. 2020

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Varying the temperature of the reaction of [{Cd(pfb)(H2O)4}+n·n(pfb)−], [Ln2(pfb)6(H2O)8]·H2O (Hpfb = pentafluorobenzoic acid), and 1,10-phenanthroline (phen) in MeCN followed by crystallization resulted in the isolation of two type of products: 1D-polymers [LnCd(pfb)5(phen)]n·1.5nMeCN (Ln = Eu (I), Gd (II), Tb (III), Dy (IV)) which were isolated at 25 °C, and molecular compounds [Tb2Cd2(pfb)10(phen)2] (V) formed at 75 °C. The transition from a molecular to a polymer structure becomes possible because of intra- and intermolecular interactions between the aromatic cycles of phen and pfb from neighboring tetranuclear Ln2Cd2 fragments. Replacement of cadmium with zinc in the reaction resulted in molecular compounds Ln2Zn2 [Ln2Zn2(pfb)10(phen)2]·4MeCN (Ln = Eu (VI), Tb (VIII), Dy (IX)) and [Gd2Zn2(pfb)10(H2O)2(phen)2]·4MeCN (VII). A new molecular EuCd complex [Eu2Cd2(pfb)10(phen)4]·4MeCN (X)] was isolated from a mixture of cadmium, zinc, and europium pentafluorobenzoates (Cd:Zn:Ln = 1:1:2). Complexes II-IV, VII and IX exhibit magnetic relaxation at liquid helium temperatures in nonzero magnetic fields. Luminescent studies revealed a bright luminescence of complexes with europium(III) and terbium(III) ions.

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Section: Photoluminescencementioning

confidence: 99%