Lanthanide(III) (Eu, Gd, Tb, Dy) Complexes Derived from 4‐(Pyridin‐2‐yl)methyleneamino‐1,2,4‐triazole: Crystal Structure, Magnetic Properties, and Photoluminescence

The reaction of lanthanide(III) nitrates with 4‐(pyridin‐2‐yl)methyleneamino‐1,2,4‐triazole (L) was studied. The compounds [Ln(NO3)3(H2O)3]⋅2 L, in which Ln=Eu (1), Gd (2), Tb (3), or Dy (4), obtained in a mixture of MeCN/EtOH have the same structure, as shown by XRD. In the crystals of these compou...

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Published inChemistry, an Asian journal Vol. 13; no. 16; pp. 2060 - 2068
Main Authors Bazhina, Evgeniya S., Bovkunova, Anna A., Medved'ko, Alexey V., Varaksina, Evgeniya A., Taidakov, Ilya V., Efimov, Nikolay N., Kiskin, Mikhail A., Eremenko, Igor L.
Format Journal Article
LanguageEnglish
Published Germany Wiley Subscription Services, Inc 16.08.2018
Subjects
Antifungal agents
Chemistry
Coordination compounds
Crystal structure
Dysprosium
Gadolinium
lanthanides
luminescence
Magnetic measurement
Magnetic properties
Optical properties
Photoluminescence
triazoles
X-ray diffraction
X-ray diffraction
triazoles
luminescence
magnetic properties
lanthanides
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Summary:The reaction of lanthanide(III) nitrates with 4‐(pyridin‐2‐yl)methyleneamino‐1,2,4‐triazole (L) was studied. The compounds [Ln(NO3)3(H2O)3]⋅2 L, in which Ln=Eu (1), Gd (2), Tb (3), or Dy (4), obtained in a mixture of MeCN/EtOH have the same structure, as shown by XRD. In the crystals of these compounds, the mononuclear complex units [Ln(NO3)3(H2O)3] are linked to L molecules through intermolecular hydrogen‐bonding interactions to form a 2D polymeric supramolecular architecture. An investigation into the optical characteristics of the Eu3+‐, Tb3+‐, and Dy3+‐containing compounds (1, 3, and 4) showed that these complexes displayed metal‐centered luminescence. According to magnetic measurements, compound 4 exhibits single‐ion magnet behavior, with ΔEeff/kB=86 K in a field of 1500 Oe. Shell replacement: Lanthanide compounds are synthesized as analogues of lanthanide nitrate hydrates, in which hydrate water molecules are replaced by the organic ligand (L). The replacement of hydrate water molecules by L leads to changes in the coordination number (from 10 to 9), the polyhedral geometry, and magnetic characteristics (see figure).
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ISSN:1861-4728
1861-471X
1861-471X
DOI:10.1002/asia.201800511