Homochiral Dy2 Schiff Base Complexes Based on (R)/(S)-Chlocyphos: Single-Molecule Magnet Behaviours, Proton Conductivities and MCD Effects

IF 5.5 1区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Chinese Journal of Chemistry Pub Date : 2025-02-13 DOI:10.1002/cjoc.202401318

Cai-Ming Liu, Hua-Hong Zou, Yi-Quan Zhang, Xiang Hao, Xiao-Ming Ren

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引用次数: 0

Abstract

Chiral proton conductive single-molecule magnets (SMMs) are multifunctional molecular materials that can combine conductor, magnet, and chirality at the nanoscale, but there are still significant challenges to their synthesis. Herein, the hydrazone Schiff base ligand (E)-N′-(2-hydroxybenzylidene)-3-aminopyrazine-2-carbohydrazide (H₂L_Schiff) and the homochiral ligands (R)-(+)-chlocyphos/ (S)-(−)-chlocyphos (R-HL)/(S-HL) were chosen to assemble a pair of Dy₂ enantiomers [Dy₂(R-L)₂(L_Schiff)₂(DMA)₂]·2.5H₂O (R-1) (DMA = N,N-dimethylacetamide) and [Dy₂(S-L)₂(L_Schiff)₂(DMA)₂]·2.5H₂O (S-1) at room temperature. Magnetic investigation indicated that they are field-induced SMMs, with a U_eff/k value of 42.2 K at 1000 Oe, and there is ferromagnetic coupling within the molecule; these magnetic properties may be explained by the ab initio calculations. The presence of a hydrogen bonding network confers the enantiomers proton conductivities. Moreover, R-1 and S-1 show prominent magnetic circular dichroism (MCD) effects at room temperature.

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基于(R)/(S)-氯磷的同手性Dy2席夫碱配合物：单分子磁铁行为、质子电导率和MCD效应

手性质子导电单分子磁体（SMMs）是一种可以在纳米尺度上结合导体、磁体和手性的多功能分子材料，但其合成仍存在重大挑战。本文选择腙希夫碱配体(E)-N′-（2-羟基苄基）-3-氨基吡嗪-2-碳肼（H2LSchiff）和同手性配体(R)-(+)-氯磷磷/(S)-(−)-氯磷磷（R- hl)/(S- hl)）在室温下合成一对Dy2对映体[Dy2(R- l)2(LSchiff)2(DMA)2]·2.5H2O (R-1) （DMA = N，N-二甲基乙酰胺）和[Dy2(S- l)2(LSchiff)2(DMA)2]·2.5H2O (S-1)]。磁学研究表明，它们是场致smm，在1000 Oe时Ueff/k值为42.2 k，分子内部存在铁磁耦合；这些磁性可以用从头计算来解释。氢键网络的存在赋予对映体质子电导率。R-1和S-1在室温下表现出明显的磁圆二色性（MCD）效应。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Chinese Journal of Chemistry 化学-化学综合

CiteScore

8.80

自引率

14.80%

发文量

422

审稿时长

1.7 months

期刊介绍： The Chinese Journal of Chemistry is an international forum for peer-reviewed original research results in all fields of chemistry. Founded in 1983 under the name Acta Chimica Sinica English Edition and renamed in 1990 as Chinese Journal of Chemistry, the journal publishes a stimulating mixture of Accounts, Full Papers, Notes and Communications in English.