Ferromagnetic Exchange Coupling in a Family of MnIII Salen-Type Schiff-Base Out-of-Plane Dimers
Ferromagnetic Exchange Coupling in a Family of MnIII Salen-Type Schiff-Base Out-of-Plane Dimers
复制标题
DOI：
10.1021/acs.jpcc.7b03336
复制
发表时间：
2017-05
影响因子：
3.7
通讯作者：
C. Kachi‐Terajima;R. Ishii;Yoshiaki Tojo;M. Fukuda;Y. Kitagawa;Mizuki Asaoka;H. Miyasaka
中科院分区：
文献类型：
--
作者：
C. Kachi‐Terajima;R. Ishii;Yoshiaki Tojo;M. Fukuda;Y. Kitagawa;Mizuki Asaoka;H. Miyasaka
一系列MnIII盐二聚体[Mn2(5-Rsaltmen)2(X)2](A)2n (saltmen2 - = N,N ' -（1,1,2,2-四亚甲基乙烯）双（水杨酸氨基甲酸酯）；R = H, Cl, Br, MeO, Me；合成了X = H2O, ReO4 -, NO3 -, N3 -, NCS -, A - = ClO4 -, PF6 -, CF3SO3 - (X = H2O)，并对其内部铁磁（FM）相互作用与单分子磁体（SMM）行为之间的关系进行了结构和磁学研究。所有配合物均具有相似的二μ酚酸桥接面外二聚体结构，但根据盐配体和轴向X配体的R取代基的不同，其桥接Mn-Oph *距离不同。磁化率研究表明，二聚体内部FM耦合（JMn-Mn *）导致所有二聚体的ST = 4基态。而FM耦合的大小与R和x密切相关。JMn-Mn *随Mn-Oph *距离的减小而增大，随Mn-X距离的减小而减小，关系为H2O≈ReO4 - > NO3 - > N3 -≈NCS -, R = H, Cl， Me呈线性趋势，而对…
A series of MnIII saltmen dimers, [Mn2(5-Rsaltmen)2(X)2](A)2n (saltmen2– = N,N′-(1,1,2,2-tetramethylethylene)bis(salicylideneiminate); R = H, Cl, Br, MeO, Me; X = H2O, ReO4–, NO3–, N3–, NCS–, A– = ClO4–, PF6–, CF3SO3– for X = H2O) were synthesized and structurally and magnetically investigated to understand the correlation between their intradimer ferromagnetic (FM) interaction and single-molecule magnet (SMM) behavior. All complexes had a similar di-μ-phenolate-bridged out-of-plane dimer structure but displayed different bridging Mn–Oph* distances depending on the R substituents of the saltmen ligand and axial X ligand. Magnetic susceptibility studies revealed intradimer FM coupling (JMn–Mn*), resulting in an ST = 4 ground state for all dimers. However, the magnitude of FM coupling strongly depended on R and X. JMn–Mn* increased with decreasing Mn–Oph* distance but decreased with decreasing Mn–X distance with a relation of H2O ≈ ReO4– > NO3– > N3– ≈ NCS– with a linear trend for R = H, Cl, Me but not for ...