Influence of ligand substitution and the solvent effect on the structures and magnetic properties of dinuclear Dy-2 supramolecular architectures constructed with the bis-beta-diketonate-Dy-2 building block as a metalloligand

文献类型： 外文期刊

第一作者： Tang, Jiamin

作者： Tang, Jiamin;Zhang, Sheng;Li, Linzhou;Yao, Linbin;Zhang, Ronghu;Zhang, Ronghu;Yin, Bing;Zhang, Jiangwei

作者机构：

期刊名称：DALTON TRANSACTIONS （ 影响因子：4.0； 五年影响因子：3.7 ）

ISSN： 1477-9226

年卷期： 2023 年 52 卷 5 期

页码：

收录情况： SCI

摘要： Based on the bis-beta-diketonate-Dy-2 metalloligand [Dy-2(pbth)(4)]center dot 2Et(3)N (1, pbth = (3z,3 ' z)-4,4 '-(1,3-phenylene)bis(1,1,1-trifluoro-4-hydroxybut-3-en-2-one)), six dinuclear complexes with eight-coordinated geometries were synthesized solvothermally through different capping N-donor coligands or solvent systems. These complexes are namely [Dy-2(pbth)(3)(Phen)(2)]center dot 2C(2)H(5)OH (2), [Dy-2(pbth)(3)(BPhen)(2)]center dot 2C(2)H(5)OH (3), [Dy-2(pbth)(3)(Dppz)(2)]center dot 2C(2)H(5)OH (4), [Dy-2(pbth)(3)(Dppz)(2)]center dot 2CH(3)OH (4a), [Dy-2(pbth)(3)(4-Dmbp)(2)]center dot CH3OH center dot C2H5OH (5) and [Dy-2(pbth)(3)(5-Dmbp)(2)]center dot CH3OH (6) (Phen = 1,10-phenanthroline, BPhen = 4,7-diphenyl-1,10-phenanthroline, dppz = dipyrido [3,2-a:2 ',3 '-c] phenazine, 4-Dmbp = 4,4 '-dimethyl-2,2 '-bipyridyl, 5-Dmbp = 5,5 '-dimethyl-2,2 '-bipyridyl), respectively. In the synthetic processes of 2-6, one of four bis-beta-diketonate ligands in the metalloligand is replaced by two capping N-donor coligands. The coordination geometries, metal distances and M-L-M torsion angles of the synthesized complexes are perceptibly fine-tuned by the modification of the capping N-donor coligands or the latticed solvent molecules. Systematic magnetic investigations indicate the different magnetic relaxation dynamics of 1-6. Complex 1 displays no characteristics of single-molecule magnets (SMMs), while complexes 2-6 exhibit SMM behaviours in the absence of a static magnetic field. Complexes 2 and 3 possess effective energy barriers (U-eff) of 110.18 (2) K and 133.21 (4) K, respectively. Theoretical analysis based on ab initio calculation provides some interpretations of experimental observation.

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