Abstract
A series of anionic heavy lanthanide complexes, involving the N-salicylideneglycinato(2-) Schiff base ligand (salgly) and having the general formula K[Ln(salgly)2(H2O)2]∙H2O (1–6), where Ln stands for Gd, Tb, Dy, Ho, Er and Tm, was prepared using the one-pot template synthesis. The complexes were thoroughly characterized by elemental and Thermogravimetric/Differential Thermal Analyses (TG/DTA), Fourier Transform Infrared Spectroscopy (FT-IR), and photoluminescence spectroscopies, electrospray-ionization mass spectrometry, and their magnetic properties were studied by temperature-dependent dc magnetic measurements using the superconducting quantum interference device (SQUID). The X-ray structure of the terbium(III) complex (2), representing the unique structure between the lanthanide complexes of N-salicylideneamino acids, was determined. The results of spectral and structural studies revealed the isostructural nature of the prepared complexes, in which the lanthanide ion is octacoordinated by two O,N,O-donor salgly ligands and two aqua ligands. The analysis of magnetic data confirmed that the complexes behave as paramagnets obeying the Curie law. The results of photoluminescence spectral studies of the complexes showed the different origin in their luminescent properties between the solid state and solution. An antenna effect of the Schiff base ligand was observed in a powder form of the complex only, while it acts as a fluorophore in a solution.
Highlights
Many modern and emerging technologies, like the high-density data storage, quantum computing, or specific sensor applications [1] require new tailored and multifunctional compounds/materials for their further innovative development
We decided to investigate these compounds, and we prepared and characterized a series of anionic complexes having the general formula K[Ln(salgly)2(H2O)2]·H2O, where Ln represents one of the heavy lanthanide metals selected from the group Gd, Tb, Dy, Ho, Er, and Tm, and to study their structural, magnetic and photoluminescent properties with the aim to find any applicable feature of them
Fourier Transform Infrared Spectroscopy (FT-IR) (ATR, cm−1), signal intensities are defined as w = weak, m = medium, and s = strong: 3338m ν(O–H), 3048s ν(C–H)arom, 2905m ν(C–H)aliphatic, 1627s ν(C=N), 1559s, 1543s νasym(COO), 1469m ν(C=C)arom, 1447m νsym(COO), 1301m ν(C–O)arom, 1068w δ(C–H)arom, 756m δ(H–C–H)
Summary
Many modern and emerging technologies, like the high-density data storage, quantum computing, or specific sensor applications [1] require new tailored and multifunctional compounds/materials for their further innovative development Due their favourable electronic and coordination properties and the ability to act as multidentate chelate or bridging ligands, the Schiff bases represent a group of organic ligands very commonly used for the preparation of coordination compounds showing interesting physical (e.g., spin crossover properties, single molecule/chain magnetism, luminescence, non-linear optic properties, etc.) or chemical properties (e.g., favourable redox properties, selective reactivity towards specific molecules, etc.), as well as biological activities (e.g., antimicrobial, antiradical, radioprotective, antidiabetic, anticancer, etc.) [2,3,4,5,6,7,8,9,10]. We decided to investigate these compounds, and we prepared and characterized a series of anionic complexes having the general formula K[Ln(salgly)2(H2O)2]·H2O, where Ln represents one of the heavy lanthanide metals selected from the group Gd, Tb, Dy, Ho, Er, and Tm, and to study their structural, magnetic and photoluminescent properties with the aim to find any applicable feature of them
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