Syntheses, structures and properties of 5-azotetrazolyl salicylic acid and its dilanthanide complexes

Chen, Wen Bin; Li, Zhixin; Yu, Xinwei; Yang, Meng; Qiu, Yan-Xuan; Dong, Wen; Sun, Yan‐Qiong

doi:10.1039/c4dt00278d

Cited by 19 publications

(11 citation statements)

References 48 publications

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“…The distance between the carboxylate-bridging dinuclear units and the oxygen-bridging dinuclear unit is 8.72 Å at least, which indicates the magnetic interactions could be ignored. Herein the overall magnetic phenomenon of 3 is comprised of antiferromagnetic Dy(O) 2 Dy units and ferromagnetic Dy(COO) 2 Dy units, which are in accord with the reported carboxylate-bridging dinuclear dysprosium complexes. − …”

Section: Resultssupporting

confidence: 85%

Magnetic Properties and Photoluminescence of Lanthanide Coordination Polymers Constructed with Conformation-Flexible Cyclohexane-Tetracarboxylate Ligands

Gao

Zhou

et al. 2016

Crystal Growth & Design

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To investigate the effects on the physical properties of complexes with different conformations of flexible ligands, four lanthanide (Ln) coordination polymers with flexible ligand cyclohexane-1e,2a,4a,5e-tetracarboxylic acidDy, 3; Tb, 4), have been synthesized and characterized. Complexes 1 and 2 are 2D layers composed of L II ligands and [Ln 2 O 2 ] dinuclear units whereas complexes 3 and 4 are 3D coordination frameworks constructed with L IV ligands and two kinds of dinuclear units, [Ln 2 O 2 ] and [Ln 2 (COO) 2 ]. Notably, the conformations of ligands in two structures, which were different and changed from the original L I conformation to L II (e,a,e,e) and L IV (e,e,e,e) conformations, impact the construction of different structures and the magnetic properties. Complex 1 shows antiferromagnetic interactions whereas complex 3 exhibits weak ferromagnetic interactions and slow magnetic relaxation properties. Additionally, the photoluminescence of complexes 2 and 4 have been investigated.

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Section: Resultssupporting

confidence: 85%

Magnetic Properties and Photoluminescence of Lanthanide Coordination Polymers Constructed with Conformation-Flexible Cyclohexane-Tetracarboxylate Ligands

Gao

Zhou

et al. 2016

Crystal Growth & Design

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“…The magnetization value (Figure S12) rises rapidly at low fields and slightly increases at high fields, before reaching a maximum of 11.60 Nβ at 7 T. Furthermore, the lack of superimposition of the M versus H / T curves at 3 and 5 K suggests the presence of magnetic anisotropy and/or low-lying excited states for complex 2 . For 3 , the observed χ M T product at 300 K is 0.18 (Figure S11b), which is in agreement with the theoretical calculated χ M T value for two noninteracting Sm(III) ( 6 H 5/2 , S = 5/2, L = 5, g = 2/7) ions . For 4 , the observed χ M T at room temperature is 2.36 cm 3 K mol –1 .…”

Section: Resultsmentioning

confidence: 99%

“…On cooling, χ M T product declines continuously, indicating the occurrence of antiferromagnetic interactions between Eu(III) ions and/or the depopulation of the Stark levels for the Eu(III) ion. At 2 K, the χ M T product is close to zero, suggesting a J = 0 ground state of the Eu(III) ion ( 7 F 0 ). , …”

Section: Resultsmentioning

confidence: 99%

“…For 3, the observed χ M T product at 300 K is 0.18 (Figure S11b), which is in agreement with the theoretical calculated χ M T value for two noninteracting Sm(III) ( 6 H 5/2 , S = 5/2, L = 5, g = 2/7) ions. 64 For 4, the observed χ M T at room temperature is 2.36 cm 3 K mol −1 . The theoretically calculated χ M T values for two noninteracting Eu(III) ( 6 F 0 , S = 3, L = 3, g = 5) ions is 0 cm 3 K mol −1 at room temperature.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

“…At 2 K, the χ M T product is close to zero, suggesting a J = 0 ground state of the Eu(III) ion ( 7 F 0 ). 64,65 To investigate the magnetic dynamics of 1 and 2, alternating-current (ac) magnetic susceptibilities were performed (Figures 4 and 5 and Figure S13). For 1, a series of temperature-and frequency-dependent peaks in the diagram of χ M ″ are observed in zero dc field.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

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Structures, Single-Molecule Magnets, and Fluorescent Properties of Four Dinuclear Lanthanide Complexes Based on 4-Azotriazolyl-3-hydroxy-2-naphthoic Acid

Xie

Huang

et al. 2019

Inorg. Chem.

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Four isostructural dinuclear lanthanide complexes based on 4azotriazolyl-3-hydroxy-2-naphthoic acid (H 3 ATNA) and 3-hydroxy-2-naphthoic acid (H 2 NA) ligands, {[Ln 2 (HATNA) 2 (HNA) 2 (H 2 O) 4 ]•6DMF} (Ln = Dy (1), Tb (2), Sm (3), Eu (4); DMF = N,N-dimethylformamide) have been prepared and characterized by X-ray diffraction crystallography, dc/ac magnetic characterization, and fluorescent spectrometry. The crystallographic data reveal dinuclear lanthanide cores of complexes 1−4, bridged by phenoxo and μ 1,3 carboxyl groups. Each nine-coordinated Ln(III) ion is located in a slightly distorted monocapped square antiprism. The ligand of H 3 ATNA displays a unique antenna effect in complex 4. Complexes 1−3 display only two ligand-centered fluorescent emissive peaks around 450 and 600 nm, and complex 4 shows four characteristic Eu(III)centered emission bands at 593, 618, 653, and 698 nm under excitation at 348 nm. Complex 1 exhibits single-molecule magnet behavior that is rationalized through ab initio calculations.

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Light‐Switchable Metal Complexes: Introducing Photoresponsive Behaviour Through Azoheteroarenes

et al. 2023

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Azoheteroarenes are emerging classes of photoswitches with versatile scaffolds that offer distinct features such as efficient photoisomerization, tunable stability of the photoswitched states, and bidirectional photoswitching. Moreover, the heteroatoms of such photoswitches exhibit coordination ability to bind to the metal centers. The resulting azoheteroarene‐based metal complexes can be designed and developed to tune various metal‐based properties towards intriguing applications such as in optics, magnetic properties, data storage applications, and catalysis. Despite the diverse utility of azopyridines in such contexts, other azoheteroarenes, particularly the state‐of‐the‐art five‐membered heterocycle‐based photoswitches, remain under‐explored. In this Review, we describe the diverse classes of azoheteroarene‐coordinated metal complexes reported in the literature and survey their photoswitching behaviour and applications. Furthermore, we identify potential azoheteroarene candidates for building photochrome‐coupled metal complexes and supramolecular architectures for maximizing the photo‐tuning of metal‐related properties.

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Syntheses, structures and properties of 5-azotetrazolyl salicylic acid and its dilanthanide complexes

Cited by 19 publications

References 48 publications

Magnetic Properties and Photoluminescence of Lanthanide Coordination Polymers Constructed with Conformation-Flexible Cyclohexane-Tetracarboxylate Ligands

Magnetic Properties and Photoluminescence of Lanthanide Coordination Polymers Constructed with Conformation-Flexible Cyclohexane-Tetracarboxylate Ligands

Structures, Single-Molecule Magnets, and Fluorescent Properties of Four Dinuclear Lanthanide Complexes Based on 4-Azotriazolyl-3-hydroxy-2-naphthoic Acid

Light‐Switchable Metal Complexes: Introducing Photoresponsive Behaviour Through Azoheteroarenes

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