POLYHEDRON
·
2022
·
IF 2.975
Na Qiao,Xiao-Xiao Li,Ying Chen,Xiao-Yan Xin,Chen Yang,Shan-Shan Dong,Yan-Zi Wang,Xing-Jin Li,Yu-Peng Hua,Wen-Min Wang
Three dinuclear Ln 2 compounds, [Ln 2 (dbm) 4 (L - ) 2 ]·4CH 3 CN (Ln = Gd ( 1 ), Tb ( 2 ), Dy ( 3 ), HL = (E)-N'-(2-hydroxybenzylidene)benzohydrazide and dbm = dibenzoylmethane), have been obtained by a solvent evaporation method. The structural analyses indicate that the three Ln 2 compounds (Gd 2 , Tb 2 and Dy 2 ) are isostructural with a Ln 2 O 2 center. Magnetic investigations show the presence of magnetic refrigeration in the Gd-based compound with a -ΔS m value of 17.62 J kg −1 K −1 ( T = 2.0 K and Δ H = 7.0 T); for compound 3 , however, single-molecular magnet behavior (SMM) was observed ( U eff /k B = 0.84 K and τ 0 = 1.08 × 10 −5 s).
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2026
·
IF 3.3
Cai-Ming Liu,Yi-Quan Zhang,Xiang Hao,Xi-Li Li
It is still a major challenge to construct multifunctional complexes using axial chiral ligands. Herein, the axial chiral ligands (R)/(S)-1,1'-binaphthyl-2,2'-diyl hydrogen phosphate (R-HL/S-HL) was used as a bridging ligand, and together with the Schiff base bridging ligand {H2LSchiff = [2-[(E)-(5-fluoro-2-hydroxyphenyl)methylidene]diazanyl](4-chloropyridin-2-yl)methanone}, two pairs of homochiral Dy2 complexes [Dy2(R-L/S-L)2(LSchiff)2(DMA)2]·3DMA·4H2O (R-1/S-1) and [Dy2(R-L/S-L)2(LSchiff)2(DMF)2]·3DMF (R-2/S-2) were successfully constructed at room temperature in different solvents (DMA vs DMF). Interestingly, although their coordination modes as terminal ligands are very similar, the subtle differences between DMA and DMF molecules cause changes in the space groups: R-1 and S-1 crystallize in the P1 chiral space group whereas R-2 and S-2 in the P212121 chiral space group, which may affect their nonlinear optical properties: R-1 and S-1 exhibits both SHG and THG responses, while R-2 and S-2 only displays a THG response. Notably, R-1/S-1 and R-2/S-2 are ferromagnetic coupling, and behave as single-molecule magnets (SMMs) at 0 Oe, and their magnetic properties were further studied using Ab initio calculations. Moreover, the magneto-optical effects of R-1/S-1 and R-2/S-2 were investigated by their magnetic circular dichroism (MCD) spectra.
✓ 已验证
DOI
PubMed
高影响因子
INORGANICA CHIMICA ACTA
·
2023
·
IF 2.8
Kai-Long Zhong,Xia-Qing Ma,Yue-Hao Tong,Hong Hu,Yu-Xin Chen,Yan-Ni Ling,Min Cui,Tao Jia,Yin-Ling Hou,Wen-Min Wang
Two new dinuclear Dy(III)-based compounds [Dy 2 (HL) 2 ]·2CH 3 OH·CH 3 CN ( 1 ) and [Dy 2 (dbm) 2 (H 2 L) 2 ]·6CH 3 CN ( 2 ) (H 4 L = N', N''-((1E,1′E)-(1,10-phenanthroline-2,9-diyl)bis(methaneylylidene))bis(2-hydroxybenzohydrazide), and Hdbm = dibenzoylmethane) constructed by a large conjugated diacylhydrazone ligand (H 4 L) have been successfully synthesized under solvothermal conditions. The crystal structures, fluorescent properties, and magnetic properties of the two Dy 2 compounds ( 1 and 2) have been systematically studied. Compounds 1 and 2 show different molecule structures (Compound 1 displays a cattail leaf fan shape, while compound 2 displays a pinwheel-shaped cage). Both compounds 1 and 2 show well solvent stability. Moreover, magnetic properties study reveals that compounds 1 and 2 show single-molecule-magnet behaviors with different energy barrier (the anisotropic barriers (Δ E / k B ) is 29.45 K for 1 and 62.52 K for 2 . Compounds 1 and 2 show different magnetic properties due to the different chemical environments around the center Dy(III) ions.
研究领域:
化学
·
材料科学
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产品关联
DOI
高影响因子
POLYHEDRON
·
2021
·
IF 3.052
Qin Wang,Hui-Min Gao,Wen-Juan Xue,Kai-Yang Chen,Quan Zhang,Min Huang,Rui-Feng Wang,Wen-Liang Fan,Yu-Peng Hua,Ming Fang
Four new acyloxy bridged Ln III 2 compounds [Ln 2 (L) 2 (acac) 2 (EtOH) 2 ] (Ln(III) = Gd ( 1 ), Tb ( 2 ), Dy ( 3 ), and Ho ( 4 ), Hacac = acetylacetone, and H 2 L = pyridine-2-carboxylic acid (3-ethoxy-2-hydroxy-benzylidene)-hydrazide) have been prepared by a polydentate Schiff base ligand under solvothermal condition. The single-crystal X-ray structure study reveals that 1 – 4 are isostructural and contain a parallelogram Ln 2 O 2 core. Magnetic study reveals that antiferromagnetic interaction exists in compound 1 . More importantly, compound 1 displays well cryogenic magnetic refrigeration property (−Δ S m = 28.2 J kg −1 K −1 , T = 2.0 K and Δ H = 70 kOe); while compound 3 exhibits evident single-molecule magnet behavior under zero-field condition (Δ E / k B = 26.8 K, τ 0 = 1.05 × 10 −7 s).
研究领域:
无机化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）