1
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Gawryszewska P, Ślepokura K, Lisowski J. Triple-Decker Hexaazamacrocyclic Lanthanide(III) Complexes: Structure, Magnetic Properties, and Temperature-Dependent Luminescence. Inorg Chem 2024; 63:15875-15887. [PMID: 39120757 DOI: 10.1021/acs.inorgchem.4c02047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/10/2024]
Abstract
The reaction of fluoride anions with mononuclear rare-earth(III) complexes of the hexaazamacrocycle derived from 2,6-diformylpyridine and ethylenediamine affords trinuclear coordination compounds [Ln3L3(μ2-F)4(NO3)2](NO3)3. The X-ray crystal structures of these complexes show triplex cationic complexes where the three roughly parallel macrocyclic lanthanide(III) units are linked by bis-μ2-F bridges. The detailed analysis of the photophysical properties of the [Eu3L3(μ2-F)4(NO3)2](NO3)3·2H2O and [Tb3L3(μ2-F)4(NO3)2](NO3)3·3H2O complexes reveals different temperature dependence of luminescence intensity and luminescence decay time of the Eu(III) and Tb(III) derivatives. The spectra of mixed species of average composition [Eu1.5Tb1.5L3(μ2-F)4(NO3)2](NO3)3·3H2O are in accordance with the ratiometric luminescent thermometer behavior. Measurements of the direct-current (dc) magnetic susceptibility of the [Dy3L3(μ2-F)4(NO3)2](NO3)3·2H2O complex indicate possible ferromagnetic interactions between the Dy(III) ions. Alternating current (ac) susceptibility measurements of this complex indicate single-molecule magnet behavior in zero dc field with magnetic relaxation dominated by Orbach mechanism and an effective energy barrier Ueff = 12.3 cm-1 (17.7 K) with a pre-exponential relaxation time, τ0 of 7.3 × 10-6 s. A similar reaction of mononuclear macrocyclic complexes with a higher number of fluoride equivalents results in polymeric {[Ln3L3(μ2-F)5](NO3)4}n complexes. The X-ray crystal structure of the Nd(III) derivative of this type shows trinuclear units that are additionally linked by single fluoride bridges to form a linear coordination polymer.
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Affiliation(s)
- Paula Gawryszewska
- Department of Chemistry, University of Wrocław, 14 F. Joliot-Curie, Wrocław 50-383, Poland
| | - Katarzyna Ślepokura
- Department of Chemistry, University of Wrocław, 14 F. Joliot-Curie, Wrocław 50-383, Poland
| | - Jerzy Lisowski
- Department of Chemistry, University of Wrocław, 14 F. Joliot-Curie, Wrocław 50-383, Poland
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2
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Gil Y, de Santana RC, Vega A, Aravena D, Spodine E. Influence of symmetry on the magneto-optical properties of a bifunctional macrocyclic Dy III complex. Dalton Trans 2023. [PMID: 38014706 DOI: 10.1039/d3dt03042c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2023]
Abstract
In this work, a novel complex, [Dy(LPr)(NO3)2]·(H2O)·(NO3) (1), containing a highly distorted macrocyclic ligand (LPr) and weak axial anions (NO3-), was synthesized and characterized. Even though this coordination environment is not ideal for maximizing the magnetic anisotropy of a DyIII ion, a magneto-structural analysis reveals that the high distortion of the macrocycle promotes a disposition of the hard plane and easy axis opposite to the expected one. This results in a quite symmetrical environment which allows obtaining a field induced SMM behaviour. The magnetic relaxation properties of this complex were rationalized with the aid of ab initio multireference calculations. Moreover, 1 showed the characteristic emission bands of DyIII ion, indicating that the macrocyclic ligand acts as an efficient sensitizer in the energy transfer process to the emissive state of the DyIII ion. Due to the symmetric environment of 1, the Y/B intensity ratio (0.61) results in CIE coordinates (0.278; 0.314), close to those of the white light region. To gain further insight into the mechanism leading to the luminescence properties, ab initio calculations were performed to elucidate the key factors controlling the Y/B intensity ratio in this bifunctional complex.
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Affiliation(s)
- Yolimar Gil
- Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Olivos 1007, 8380544, Santiago, Chile.
| | - Ricardo Costa de Santana
- Instituto de Física, Universidade Federal de Goiás, Campus Samambaia, 74690-900, Goiânia (GO), Brazil
| | - Andrés Vega
- Departamento de Ciencias Químicas, Universidad Andrés Bello, Santiago, Chile
| | - Daniel Aravena
- Departamento de Química de los Materiales, Facultad de Química y Biología, Universidad de Santiago de Chile, Casilla 40, Correo 33, Santiago, Chile.
| | - Evgenia Spodine
- Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Olivos 1007, 8380544, Santiago, Chile.
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3
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Kapurwan S, Sahu PK, Raizada M, Kharel R, Konar S. [α-AsW 9O 33] 9- bridged hexagonal clusters of Ln(III) showing field induced SMM behavior: experimental and theoretical insight. Dalton Trans 2023. [PMID: 37357913 DOI: 10.1039/d3dt00406f] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/27/2023]
Abstract
Polyoxometalates (POM), as inorganic polydentate oxygen donors, provide binding opportunities for oxophilic lanthanide metal centers to construct novel Ln-substituted POM materials with exciting structures and attractive properties. Herein, we have reported four arsenotungstate [α-AsW9O33]9- based lanthanide-containing polyoxometalates [CsxK36-x{Ln6(H2O)12(α-AsW9O33)6}]·yH2O (Ln = Er (1), Gd (2), Ho (3), and Tb (4)), which are synthesized in an alkaline medium. Complexes 1-3 are the dimeric structures of [Ln3(H2O)6(α-AsW9O33)3]18- polyanions, whereas complex 4 is a hexamer of the polyanion [Tb (H2O)2(α-AsW9O33)]6- as a building unit. In all the complexes, [α-AsW9O33]9- units are staggered up and down and give rise to the chair conformation, where one [α-AsW9O33]9- unit bridges two Ln(III) centers through four μ2-oxygen and two terminal oxygen atoms, resulting in the hexagonal arrangement of lanthanides. The dynamic magnetic measurement indicates that only complex 1 exhibits slow relaxation of magnetization with an applied dc field (1500 Oe). To gain insight into the slow relaxation of magnetization in complex 1, the ligand-field parameters and the splitting of the ground-state multiplet of the Er(III) ions have been estimated. The ab initio calculation results confirm that the ground state wave function of these molecules (1, 3, and 4) is mainly composed of a mixture of mJ states, and the non-axial crystal field (CF) terms are more predominant than the axial CF term. The solid-state fluorescence spectra of 1-4 reveal that the photoexcitation O → M ligand-to-metal charge-transfer (LMCT) of arsenotungstate fragments is effectively quenched due to the spatial coordination environment around the Ln(III) ion.
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Affiliation(s)
- Sandhya Kapurwan
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Bhopal By-pass Road, Bhauri, Bhopal-462066, Madhya Pradesh, India.
| | - Pradip Kumar Sahu
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Bhopal By-pass Road, Bhauri, Bhopal-462066, Madhya Pradesh, India.
| | - Mukul Raizada
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Bhopal By-pass Road, Bhauri, Bhopal-462066, Madhya Pradesh, India.
| | - Ranjan Kharel
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Bhopal By-pass Road, Bhauri, Bhopal-462066, Madhya Pradesh, India.
| | - Sanjit Konar
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Bhopal By-pass Road, Bhauri, Bhopal-462066, Madhya Pradesh, India.
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4
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Gil Y, de Santana RC, de Camargo ASS, Merízio LG, Carreño PF, Fuentealba P, Manzur J, Spodine E. Dual visible and near-infrared luminescence in mononuclear macrocyclic erbium(III) complexes via ligand and metal centred excitation. Dalton Trans 2023; 52:3158-3168. [PMID: 36790124 DOI: 10.1039/d2dt03447f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
Abstract
Considering the structural design of some of the scarce molecular-based Er-centred emitters in the literature, we explored the optical properties of three ErIII hexaazamacrocyclic complexes, namely Er-EDA (1), Er-OPDA(2) and Er-DAP(3). The macrocyclic ligands in these complexes differ in the lateral spacers, and are derived from 2,6-pyridine-dicarbaldehyde and ethylenediamine (EDA), ortho-phenylenediamine (OPDA) or 1,3-diaminopropane (DAP). Upon ligand-centred excitation, the bluish-green and green emissions of the ErIII ion were detected only for the complexes containing macrocycles with aliphatic spacers (1 and 3), which evidenced that these ligands can sensitize the ErIII luminescence. On the other hand, the ligand derived from the aromatic diamine (2) does not sensitize the ErIII luminescence. Energy transfer mechanisms, temperature sensing, CIE coordinates and CCT values were analyzed. Besides the excitation in the ligands, the erbium-centred excitation at 980 nm allowed the detection, in all cases, of bluish-green, green and red up-converted emissions, and also the downshifted NIR emission. The possible mechanisms involved in these transitions were described and analyzed according to the available data.
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Affiliation(s)
- Yolimar Gil
- Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Olivos 1007, 8380544, Santiago, Chile.
| | - Ricardo Costa de Santana
- Instituto de Física, Universidade Federal de Goiás, Campus Samambaia, 74690-900, Goiânia, GO, Brazil.
| | - Andréa Simone Stucchi de Camargo
- Instituto de Física de São Carlos, Universidade de São Paulo, Avenida Trabalhador São-Carlense, n°400 Parque Arnold Schimidt, CEP, 13566-590, São Carlos, SP, Brazil.
| | - Leonnam Gotardo Merízio
- Instituto de Física de São Carlos, Universidade de São Paulo, Avenida Trabalhador São-Carlense, n°400 Parque Arnold Schimidt, CEP, 13566-590, São Carlos, SP, Brazil.
| | - Patricia Farías Carreño
- Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Olivos 1007, 8380544, Santiago, Chile.
| | - Pablo Fuentealba
- Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Olivos 1007, 8380544, Santiago, Chile.
| | - Jorge Manzur
- Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Olivos 1007, 8380544, Santiago, Chile.
| | - Evgenia Spodine
- Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Olivos 1007, 8380544, Santiago, Chile.
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5
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Pramanik K, Jagličić Z, Herchel R, Brandão P, Jana NC, Panja A. Combined experimental and theoretical studies on a series of mononuclear Ln III single-molecule magnets: dramatic influence of remote substitution on the magnetic dynamics in Dy analogues. Dalton Trans 2023; 52:1241-1256. [PMID: 36606746 DOI: 10.1039/d2dt03354b] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
A series of LnIII complexes of general formula [Ln(H2L1)2(NO3)2(H2O)](NO3) (1-5) [Ln = Dy (1), Tb (2) Ho (3), Er (4), and Yb (5)] and an analogous DyIII complex with ligand H2L2, [Dy(H2L2)2(NO3)3(H2O)](NO3) (6), where H2L1 and H2L2 stand for (E)-2-[(2-hydroxyphenyl)iminomethyl]-6-methoxy-4-methylphenol and (E)-2-[(2-hydroxy-5-methylphenyl)iminomethyl]-6-methoxy-4-methylphenol, respectively, have been synthesized and magneto-structurally characterized. All these complexes are isostructural and isomorphous, in which the zwitterionic form of the ligands predominantly coordinate the metal centers. The magnetic study revealed that complex 3 displays negligible SMM behaviour, while 1 and 6 are zero field SMMs, the performance of which can largely be improved in the presence of an applied dc field by lowering under barrier relaxation processes, and finally 2, 4, and 5 are field-induced SMMs. The most remarkable observation in the present study is the dramatically-enhanced SMM performance in 6 compared to 1, achieved by only a remote methyl substitution at the ligand framework to increase the intermolecular separation. Although SINGLE_ANISO ab initio calculations for 1 and 6 are very similar, the POLY_ANISO module revealed weak dipolar interactions in both the compounds but significant antiferromagnetic interaction in 1, thereby justifying the experimental fact. The present work discloses that even a small substitution such as a methyl group can adequately increase the intermolecular separation, leading to several-fold enhanced effective energy barrier.
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Affiliation(s)
- Kuheli Pramanik
- Department of Chemistry, Gokhale Memorial Girls' College, 1/1 Harish Mukherjee Road, Kolkata 700020, India. .,Department of Chemistry, Panskura Banamali College, Panskura RS, WB 721152, India
| | - Zvonko Jagličić
- Institute of Mathematics, Physics and Mechanics & Faculty of Civil and Geodetic Engineering, University of Ljubljana, Jadranska 19, 1000 Ljubljana, Slovenia
| | - Radovan Herchel
- Department of Inorganic Chemistry, Faculty of Science, Palacký University, 17. listopadu 12, 77146 Olomouc, Czech Republic
| | - Paula Brandão
- Department of Chemistry, CICECO-Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Narayan Ch Jana
- Department of Chemistry, Panskura Banamali College, Panskura RS, WB 721152, India
| | - Anangamohan Panja
- Department of Chemistry, Gokhale Memorial Girls' College, 1/1 Harish Mukherjee Road, Kolkata 700020, India. .,Department of Chemistry, Panskura Banamali College, Panskura RS, WB 721152, India
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6
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Lu YB, Huang J, Liao YQ, Lin XL, Huang SY, Liu CM, Wen HR, Liu SJ, Wang FY, Zhu SD. Multifunctional Dinuclear Dy-Based Coordination Complex Showing Visible Photoluminescence, Single-Molecule Magnet Behavior, and Proton Conduction. Inorg Chem 2022; 61:18545-18553. [DOI: 10.1021/acs.inorgchem.2c02822] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Ying-Bing Lu
- Jiangxi Key Laboratory of Function of Materials Chemistry, College of Chemistry and Chemical Engineering, Gannan Normal University, Ganzhou 341000, PR China
| | - Jing Huang
- Jiangxi Key Laboratory of Function of Materials Chemistry, College of Chemistry and Chemical Engineering, Gannan Normal University, Ganzhou 341000, PR China
| | - Ya-Qing Liao
- Jiangxi Key Laboratory of Function of Materials Chemistry, College of Chemistry and Chemical Engineering, Gannan Normal University, Ganzhou 341000, PR China
| | - Xue-Lian Lin
- Jiangxi Key Laboratory of Function of Materials Chemistry, College of Chemistry and Chemical Engineering, Gannan Normal University, Ganzhou 341000, PR China
| | - Si-Yu Huang
- Jiangxi Key Laboratory of Function of Materials Chemistry, College of Chemistry and Chemical Engineering, Gannan Normal University, Ganzhou 341000, PR China
| | - Cai-Ming Liu
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China
| | - He-Rui Wen
- School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000 Jiangxi Province, PR China
| | - Sui-Jun Liu
- School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000 Jiangxi Province, PR China
| | - Fei-Yang Wang
- Jiangxi Key Laboratory of Function of Materials Chemistry, College of Chemistry and Chemical Engineering, Gannan Normal University, Ganzhou 341000, PR China
| | - Shui-Dong Zhu
- Jiangxi Key Laboratory of Function of Materials Chemistry, College of Chemistry and Chemical Engineering, Gannan Normal University, Ganzhou 341000, PR China
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7
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Gil Y, Gimeno-Muñoz R, Santana RCD, Aliaga-Alcalde N, Fuentealba P, Aravena D, González-Campo A, Spodine E. Luminescence of Macrocyclic Mononuclear Dy III Complexes and Their Immobilization on Functionalized Silicon-Based Surfaces. Inorg Chem 2022; 61:16347-16355. [PMID: 36198146 DOI: 10.1021/acs.inorgchem.2c02342] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Two mononuclear DyIII complexes, [Dy(L1)(NCS)3] (Dy-EDA) and [Dy(L2)(NCS)3] (Dy-DAP), where Ln (n = 1-2) corresponds to a macrocyclic ligand derived from 2,6-pyridinedicarboxaldehyde and ethylenediamine (L1) and 1,3-diaminepropane (L2) were immobilized on functionalized silicon-based surfaces. This was achieved by the microcontact printing (μCP) technique, generating patterns on a functionalized surface via covalent bond formation through the auxiliary -NCS ligands present in the macrocyclic complex species. With this strategy, it was possible to control the position of the immobilized molecules on the surface. Water contact angle measurements, X-ray photoelectron spectroscopy (XPS), infrared reflection absorption spectra (IRRAS), and atomic force microscopy (AFM) confirmed that the surfaces were successfully functionalized. Furthermore, the optical properties in a broad temperature range were investigated for the as-prepared compounds. At room temperature, Dy-EDA was shown to emit in the deep blue region (Commission Internationald'Eclairage (CIE): (0.175, 0.128)), while Dy-DAP in the white region (CIE: (0.252, 0.312)). The different CIE values were due to the contribution of the strong emission of the ligand in the case of Dy-EDA. Besides, surface photoluminescence measurements showed that the immobilized complexes retained their bulk emissive properties.
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Affiliation(s)
- Yolimar Gil
- Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Casilla 233, Santiago 8380544, Chile.,Centro para el Desarrollo de la Nanociencia y Nanotecnología (CEDENNA), Santiago 9170022, Chile
| | - Raquel Gimeno-Muñoz
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, Bellaterra, 08193 Barcelona, Spain
| | - Ricardo Costa de Santana
- Instituto de Física, Universidade Federal de Goiás, Campus Samambaia, 74690-900 Goiânia, GO, Brazil
| | - Núria Aliaga-Alcalde
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, Bellaterra, 08193 Barcelona, Spain.,ICREA─Institució Catalana de Recerca i Estudis Avançats, Passeig Lluis Companys 23, 08010 Barcelona, Spain
| | - Pablo Fuentealba
- Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Casilla 233, Santiago 8380544, Chile
| | - Daniel Aravena
- Departamento de Química de los Materiales, Facultad de Química y Biología, Universidad de Santiago de Chile, Casilla 40, Correo 33, Santiago 9170022, Chile
| | - Arántzazu González-Campo
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, Bellaterra, 08193 Barcelona, Spain
| | - Evgenia Spodine
- Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Casilla 233, Santiago 8380544, Chile.,Centro para el Desarrollo de la Nanociencia y Nanotecnología (CEDENNA), Santiago 9170022, Chile
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8
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Gil Y, Castro-Alvarez A, Fuentealba P, Spodine E, Aravena D. Lanthanide SMMs Based on Belt Macrocycles: Recent Advances and General Trends. Chemistry 2022; 28:e202200336. [PMID: 35648577 DOI: 10.1002/chem.202200336] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Indexed: 11/06/2022]
Abstract
Enhancement of axial magnetic anisotropy is the central objective to push forward the performance of Single-Molecule Magnet (SMM) complexes. In the case of mononuclear lanthanide complexes, the chemical environment around the paramagnetic ion must be tuned to place strongly interacting ligands along either the axial positions or the equatorial plane, depending on the oblate or prolate preference of the selected lanthanide. One classical strategy to achieve a precise chemical environment for a metal centre is using highly structured, chelating ligands. A natural approach for axial-equatorial control is the employment of macrocycles acting in a belt conformation, providing the equatorial coordination environment, and leaving room for axial ligands. In this review, we present a survey of SMMs based on the macrocycle belt motif. Literature systems are divided in three families (crown ether, Schiff-base and metallacrown) and their general properties in terms of structural stability and SMM performance are briefly discussed.
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Affiliation(s)
- Yolimar Gil
- Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Casilla 233, Santiago, Chile.,Centro para la Nanociencia y Nanotecnología (CEDENNA), Santiago, Estación Central, Región Metropolitana, Chile
| | - Alejandro Castro-Alvarez
- Departamento de Química de los Materiales, Facultad de Química y Biología, Universidad de Santiago de Chile, Casilla 40, Correo 33, Santiago, Chile
| | - Pablo Fuentealba
- Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Casilla 233, Santiago, Chile
| | - Evgenia Spodine
- Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Casilla 233, Santiago, Chile.,Centro para la Nanociencia y Nanotecnología (CEDENNA), Santiago, Estación Central, Región Metropolitana, Chile
| | - Daniel Aravena
- Departamento de Química de los Materiales, Facultad de Química y Biología, Universidad de Santiago de Chile, Casilla 40, Correo 33, Santiago, Chile
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9
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Lu YB, Wu JW, Zhu SD, Wang SQ, Zhang SY, Liu CM, Li R, Li J, Ai JH, Xie YR. 3-Pyridylacetic-Based Lanthanide Complexes Exhibiting Magnetic Entropy Changes, Single-Molecule Magnet, and Fluorescence. ACS OMEGA 2022; 7:2604-2612. [PMID: 35097258 PMCID: PMC8793079 DOI: 10.1021/acsomega.1c04728] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/29/2021] [Accepted: 11/30/2021] [Indexed: 06/14/2023]
Abstract
Four complexes from lanthanides, 3-pyridylacetate, and 1,10-phenanthroline, formulated as [Ln2(3-PAA)2(μ-Cl)2(phen)4](ClO4)2 [Ln = Gd(1), Dy(2), Eu(3), Tb(4), 3-PAA = 3-pyridylacetic acid, phen = 1,10-phenanthroline], were obtained. The four compounds were characterized by IR spectra, thermogravimetric analyses, powder X-ray diffraction, and single-crystal X-ray diffraction. Compounds 1-4 are isomorphous, and they have a dinuclear structure. Magnetic studies reveal that 1 shows the magnetocaloric effect with -ΔS m max = 19.03 J kg-1 K-1 at 2 K for ΔH = 5 T, and 2 displays a field-induced single-molecule magnet with U eff = 19.02 K. The photoluminescent spectra of 3 and 4 exhibit strong characteristic emission, which demonstrate that the ligand-to-EuIII/TbIII energy transfer is efficient.
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Affiliation(s)
- Ying-Bing Lu
- College
of Chemistry and Chemical Engineering, Gannan
Normal University, Ganzhou 341000, P. R. China
- National-Local
Joint Engineering Research Center of Heavy Metals Pollutants Control
and Resource Utilization, Nanchang Hangkong
University, Nanchang 330000, P. R. China
| | - Jun-Wei Wu
- College
of Chemistry and Chemical Engineering, Gannan
Normal University, Ganzhou 341000, P. R. China
| | - Shui-Dong Zhu
- College
of Chemistry and Chemical Engineering, Gannan
Normal University, Ganzhou 341000, P. R. China
| | - Sheng-Qian Wang
- College
of Chemistry and Chemical Engineering, Gannan
Normal University, Ganzhou 341000, P. R. China
| | - Shi-Yong Zhang
- College
of Chemistry and Chemical Engineering, Gannan
Normal University, Ganzhou 341000, P. R. China
| | - Cai-Ming Liu
- Beijing
National Laboratory for Molecular Sciences, CAS Key Laboratory of
Organic Solids, Institute of Chemistry,
Chinese Academy of Sciences, Beijing 100190, P. R. China
| | - Rong Li
- School
of Materials Science & Engineering, Hubei University, Wuhan 430062, P. R. China
| | - Juan Li
- College
of Chemistry and Chemical Engineering, Gannan
Normal University, Ganzhou 341000, P. R. China
| | - Jia-Hao Ai
- College
of Chemistry and Chemical Engineering, Gannan
Normal University, Ganzhou 341000, P. R. China
| | - Yong-Rong Xie
- College
of Chemistry and Chemical Engineering, Gannan
Normal University, Ganzhou 341000, P. R. China
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10
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Panja A, Jagličić Z, Herchel R, Brandão P, Pramanik K, Jana NC. Three angular Zn 2Dy complexes showing the effect of remote coordination at Zn and counter ions on slow magnetic relaxation at Dy centres. NEW J CHEM 2022. [DOI: 10.1039/d2nj01759h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Three isostructural Zn2Dy complexes displaying the effect of remote coordination at Zn and counter ions on slow magnetic relaxation at Dy centres.
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Affiliation(s)
- Anangamohan Panja
- Department of Chemistry, Panskura Banamali College, Panskura RS, WB 721152, India
- Department of Chemistry, Gokhale Memorial Girls’ College, 1/1 Harish Mukherjee Road, Kolkata 700020, India
| | - Zvonko Jagličić
- Institute of Mathematics, Physics and Mechanics & Faculty of Civil and Geodetic Engineering, University of Ljubljana, Jadranska 19, 1000 Ljubljana, Slovenia
| | - Radovan Herchel
- Department of Inorganic Chemistry, Faculty of Science, Palacký University, 17. listopadu 12, 77146 Olomouc, Czech Republic
| | - Paula Brandão
- Department of Chemistry, CICECO-Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Kuheli Pramanik
- Department of Chemistry, Panskura Banamali College, Panskura RS, WB 721152, India
- Department of Chemistry, Gokhale Memorial Girls’ College, 1/1 Harish Mukherjee Road, Kolkata 700020, India
| | - Narayan Ch. Jana
- Department of Chemistry, Panskura Banamali College, Panskura RS, WB 721152, India
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11
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Fuentealba P, Villagra D, Gil Y, Aguilar‐Bolados H, Costa de Santana R, Gasparotto G, Vega A, Manzur J, Spodine E. Thermal Dependence of the Luminescent Properties of Mononuclear Tb
III
Macrocyclic Complexes. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202100612] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Pablo Fuentealba
- Facultad de Ciencias Químicas y Farmacéuticas Universidad de Chile Dr. Carlos Lorca Tobar 964, Independencia Santiago Chile
| | - Danae Villagra
- Facultad de Ciencias Químicas y Farmacéuticas Universidad de Chile Dr. Carlos Lorca Tobar 964, Independencia Santiago Chile
- Centro de Nanociencia y Nanotecnología Av. Libertador Bernardo O'Higgins 3363, Estación Central Santiago Chile
| | - Yolimar Gil
- Facultad de Ciencias Químicas y Farmacéuticas Universidad de Chile Dr. Carlos Lorca Tobar 964, Independencia Santiago Chile
- Centro de Nanociencia y Nanotecnología Av. Libertador Bernardo O'Higgins 3363, Estación Central Santiago Chile
| | - Héctor Aguilar‐Bolados
- Departamento de Polímeros Facultad de Ciencias Químicas Universidad de Concepción Edmundo Larenas 129 Concepción Chile
| | - Ricardo Costa de Santana
- Instituto de Física Universidade Federal de Goiás Campus Samambaia 74690-900 Goiânia (GO) Brazil
| | - Gisane Gasparotto
- Instituto de Física Universidade Federal de Goiás Campus Samambaia 74690-900 Goiânia (GO) Brazil
| | - Andrés Vega
- Centro de Nanociencia y Nanotecnología Av. Libertador Bernardo O'Higgins 3363, Estación Central Santiago Chile
- Departamento de Química Universidad Andrés Bello Av. República 498 8370011 Santiago Chile
| | - Jorge Manzur
- Facultad de Ciencias Químicas y Farmacéuticas Universidad de Chile Dr. Carlos Lorca Tobar 964, Independencia Santiago Chile
| | - Evgenia Spodine
- Facultad de Ciencias Químicas y Farmacéuticas Universidad de Chile Dr. Carlos Lorca Tobar 964, Independencia Santiago Chile
- Centro de Nanociencia y Nanotecnología Av. Libertador Bernardo O'Higgins 3363, Estación Central Santiago Chile
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A series of lanthanide complexes with 2-fluorobenzoic acid and 5,5′-dimethyl-2,2′-bipyridine: Synthesis, supramolecular structures, spectroscopy and thermal behaviour. J SOLID STATE CHEM 2021. [DOI: 10.1016/j.jssc.2021.122198] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Thomas-Hargreaves LR, Giansiracusa MJ, Gregson M, Zanda E, O'Donnell F, Wooles AJ, Chilton NF, Liddle ST. Correlating axial and equatorial ligand field effects to the single-molecule magnet performances of a family of dysprosium bis-methanediide complexes. Chem Sci 2021; 12:3911-3920. [PMID: 34163660 PMCID: PMC8179472 DOI: 10.1039/d1sc00238d] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Accepted: 03/01/2021] [Indexed: 11/21/2022] Open
Abstract
Treatment of the new methanediide-methanide complex [Dy(SCS)(SCSH)(THF)] (1Dy, SCS = {C(PPh2S)2}2-) with alkali metal alkyls and auxillary ethers produces the bis-methanediide complexes [Dy(SCS)2][Dy(SCS)2(K(DME)2)2] (2Dy), [Dy(SCS)2][Na(DME)3] (3Dy) and [Dy(SCS)2][K(2,2,2-cryptand)] (4Dy). For further comparisons, the bis-methanediide complex [Dy(NCN)2][K(DB18C6)(THF)(toluene)] (5Dy, NCN = {C(PPh2NSiMe3)2}2-, DB18C6 = dibenzo-18-crown-6 ether) was prepared. Magnetic susceptibility experiments reveal slow relaxation of the magnetisation for 2Dy-5Dy, with open magnetic hysteresis up to 14, 12, 15, and 12 K, respectively (∼14 Oe s-1). Fitting the alternating current magnetic susceptibility data for 2Dy-5Dy gives energy barriers to magnetic relaxation (U eff) of 1069(129)/1160(21), 1015(32), 1109(70), and 757(39) K, respectively, thus 2Dy-4Dy join a privileged group of SMMs with U eff values of ∼1000 K and greater with magnetic hysteresis at temperatures >10 K. These structurally similar Dy-components permit systematic correlation of the effects of axial and equatorial ligand fields on single-molecule magnet performance. For 2Dy-4Dy, the Dy-components can be grouped into 2Dy-cation/4Dy and 2Dy-anion/3Dy, where the former have almost linear C[double bond, length as m-dash]Dy[double bond, length as m-dash]C units with short average Dy[double bond, length as m-dash]C distances, and the latter have more bent C[double bond, length as m-dash]Dy[double bond, length as m-dash]C units with longer average Dy[double bond, length as m-dash]C bonds. Both U eff and hysteresis temperature are superior for the former pair compared to the latter pair as predicted, supporting the hypothesis that a more linear axial ligand field with shorter M-L distances produces enhanced SMM properties. Comparison with 5Dy demonstrates unusually clear-cut examples of: (i) weakening the equatorial ligand field results in enhancement of the SMM performance of a monometallic system; (ii) a positive correlation between U eff barrier and axial linearity in structurally comparable systems.
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Affiliation(s)
| | - Marcus J Giansiracusa
- Department of Chemistry, The University of Manchester Oxford Road Manchester M13 9PL UK
| | - Matthew Gregson
- Department of Chemistry, The University of Manchester Oxford Road Manchester M13 9PL UK
| | - Emanuele Zanda
- Department of Chemistry, The University of Manchester Oxford Road Manchester M13 9PL UK
| | - Felix O'Donnell
- Department of Chemistry, The University of Manchester Oxford Road Manchester M13 9PL UK
| | - Ashley J Wooles
- Department of Chemistry, The University of Manchester Oxford Road Manchester M13 9PL UK
| | - Nicholas F Chilton
- Department of Chemistry, The University of Manchester Oxford Road Manchester M13 9PL UK
| | - Stephen T Liddle
- Department of Chemistry, The University of Manchester Oxford Road Manchester M13 9PL UK
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