Abstract
A series of neutral mononuclear lanthanide complexes [Ln(HL)2(NO3)3] (Ln = La, Ce, Nd, Eu, Gd, Dy, Ho) with rigid bidentate ligand, HL (4′-(1H-imidazol-1-yl)biphenyl-4-carboxylic acid) were synthesized under solvothermal conditions. The coordination compounds have been characterized by infrared spectroscopy, thermogravimetry, powder X-ray diffraction and elemental analysis. According to X-ray diffraction, all the complexes are a series of isostructural compounds crystallized in the P2/n monoclinic space group. Additionally, solid-state luminescence measurements of all complexes show that [Eu(HL)2(NO3)3] complex displays the characteristic emission peaks of Eu(III) ion at 593, 597, 615, and 651 nm.
Highlights
Metal-organic complexes formed by rare earth metals and multifunctional bridging ligands became of special interest to the scientific community because of their applications in various analytical, biological, and clinical fields [1,2,3,4]
The mononuclear Ln3+ complexes were obtained by mixing hydrated lanthanide nitrate and the bidentate ligand, at the ratio 3:1 in different solvents
When the synthesized complexes were performed in solvents as acetonitrile and water, at 120 ◦C, for two days, the products were realized in good yield and high purity
Summary
Metal-organic complexes formed by rare earth metals and multifunctional bridging ligands became of special interest to the scientific community because of their applications in various analytical, biological, and clinical fields [1,2,3,4]. The coordination of lanthanides with various O and N donor ligands is extremely diverse and develops a large variety of materials as coordination polymers (CPs) [21,22,23], porous coordination polymers (PCPs) [24,25,26,27,28,29], and metal-organic framework coordination polymers (MOFs) [30,31,32,33,34,35,36,37] Due to their architectures and by default of their physicochemical properties (higher thermodynamic stability, chemical stability and adjustable chemical functionalities, tunable pore surface, low density, magnetism, fluorescence, etc.), the rational design and synthesis of these materials is still an open topic for many researchers [38,39,40]. Due to their structural tunability of CPs and MOFs, their use as biomarkers in the diagnosis and/or detection of cancer disease has expanded significantly during the last decade [47]
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