Homochiral Dy2 zero-field single-molecule magnets derived from axial chiral ligands (R)/(S)-octahydro-1,1′-bi-2-naphthyl phosphate†

IF 3.3 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR Dalton Transactions Pub Date : 2025-01-28 DOI:10.1039/D4DT03408B

Cai-Ming Liu, Xiang Hao and Yi-Quan Zhang

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Abstract

The construction of homochiral zero-field single-molecule magnets (SMMs), especially with axial chiral ligands, remains a great challenge. Herein the first examples of homochiral Dy(III) Schiff base complexes based on axial chiral ligands (R)/(S)-5,5′,6,6′,7,7′,8,8′-octahydro-1,1′-bi-2-naphthyl phosphate (R-HL/S-HL), [Dy₂(R-L/S-L)₂(L_Schiff)₂(H₂O)(MeOH)]·2MeOH·CH₂Cl₂·2MeCN·2H₂O (R-1/S-1) [H₂L_Schiff = (E)-N′-(5-fluoro-2-hydroxybenzylidene)pyrazine-2-carbohydrazide], were synthesized at room temperature, which show ferromagnetic coupling and act as zero-field SMMs, with a U_eff/k value of 61 K at 0 Oe. Ab initio calculations were used to explain their magnetic interaction and magnetic relaxation properties. Furthermore, the magnetic circular dichroism (MCD) spectra of R-1/S-1 revealed that they display obvious magneto-optical effects.

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由轴向手性配体(R)/(S)-八氢-1,1'-双-2-磷酸萘基衍生的同手性Dy2零场单分子磁体

同手性零场单分子磁体（SMMs）的构建，特别是轴向手性配体的构建仍然是一个巨大的挑战。这里的第一个例子homochiral Dy(3)基于轴手性席夫碱配合物配体(R) / (S) 5、5 ',6日6 ' 7,7 ',8日,8“-octahydro-1, 1 ' -bi-2-naphthyl磷酸(R-HL / S-HL), [Dy2 (rl /的)2 (LSchiff) 2 (H2O)(甲醇)]·2甲醇*以* 2 mecn·H2O (R 1 / S - 1) [H2LSchiff = (E) - n ' - (5-fluoro-2-hydroxybenzylidene) pyrazine-2-carbohydrazide],在室温下合成,显示铁磁耦合,并执行零场多发性骨髓瘤,Ueff / k值0 Oe的61 k。用从头算解释了它们的磁相互作用和磁弛豫特性。此外，R-1/S-1的磁圆二色性（MCD）光谱显示它们具有明显的磁光效应。

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来源期刊

Dalton Transactions 化学-无机化学与核化学

CiteScore

6.60

自引率

7.50%

发文量

1832

审稿时长

1.5 months

期刊介绍： Dalton Transactions is a journal for all areas of inorganic chemistry, which encompasses the organometallic, bioinorganic and materials chemistry of the elements, with applications including synthesis, catalysis, energy conversion/storage, electrical devices and medicine. Dalton Transactions welcomes high-quality, original submissions in all of these areas and more, where the advancement of knowledge in inorganic chemistry is significant.