Unusual Structural Types in Manganese Cluster Chemistry from the Use of <i>N</i>,<i>N</i>,<i>N</i>‘,<i>N</i>‘-Tetrakis(2-hydroxyethyl)ethylenediamine: Mn<sub>8</sub>, Mn<sub>12</sub>, and Mn<sub>20</sub> Clusters
作者:Rashmi Bagai、Khalil A. Abboud、George Christou
DOI:10.1021/ic701971d
日期:2008.1.1
The syntheses, crystal structures, and magnetochemical characterization are reported for three new mixed-valent Mn clusters [Mn(8)O(3)(OH)(OMe)(O(2)CPh)7(edte)(edteH(2))](2)CPh) (1), [Mn(12)O(4)(OH)(2)(edte)(4)C(l6)(H(2)O)(2)] (2), and [Mn(20)O(8)(OH)(4)(O(2)CMe)(6)(edte)(6)](ClO(4))(2) (3) (edteH(4) = (HOCH(2)CH(2))(2)NCH(2)CH(2)N(CH(2)CH(2)OH)(2) = N,N,N',N'-tetrakis(2-hydroxyethyl)ethylenediamine)
作者:Albert Escuer、Julia Mayans、Merce Font‐Bardia、Lorenzo Di Bari、Marcin Górecki
DOI:10.1002/ejic.201601138
日期:2017.2.10
The employment of enantiomerically pure Schiffbases in manganese chemistry is revealed to be an excellent method to obtain chiral single‐molecule magnets and has allowed the characterization of several pairs of enantiomers, for which the magnetic properties were investigated. The reported systems consist of MnIII–MnII–MnIII linear trimers or MnIII3 cations in a triangular arrangement including the
在锰化学中使用对映体纯的席夫碱是一种获得手性单分子磁体的极好方法,并且可以表征几对对映体,并对其磁性进行了研究。报告的系统由三角形排列的Mn III -Mn II -Mn III线性三聚体或Mn III 3阳离子组成,包括在孤立的锰三角中的µ 3 -Cl桥的第一个例子。
Feasibility of ground state spin switching in a molecular analogue of the mixed-metal oxides with the perovskite structure
作者:Thai Son Cao、Dian-Teng Chen、Khalil A. Abboud、Xiaoguang Zhang、Hai-Ping Cheng、George Christou
DOI:10.1016/j.poly.2019.114275
日期:2020.1
magnetic susceptibility data for 2 are significantly different from those for 1 and are assigned as due to small ligand-induced structural perturbation of the core that has brought an A-type antiferromagnetic (AF) excited state much closer to the C-type AF ground state. Fits of the dc χMT vs T data support this interpretation but due to the ligand disorder in 2, a more definitive description of the lowest
A newtype of naphthoxime-based ligand, 1-(1-hydroxynaphthalen-2-yl)ethanone oxime (naphthsaoH2, 1a), is introduced into the chemistry of manganese(III) complexes. First triangular [Mn3] compound with this ligand is presented: [Mn3O(naphthsao)3(CH3OH)5(CH2ClCOO)] (1). Also preliminary structural studies for [Mn3O(naphthsao)3(CH3OH)5(CH3COO)] (A) and 0.52[Mn3O(naphthsao)3(CH3OH)5(H2O)]·0.48[Mn3O(naphthsao)3(CH3OH)6]
Series of manganese clusters derived from 2-pyridylcyanoxime with Mn3II (1), Mn4II (2a, b), MnII4MnIII4 (3), MnII2MnIII6MnIV2 (4) and MnII3MnIII6MnIV (5) cores have been characterized. Dc magnetic measurements reveal antiferromagnetic coupling for 1–4 and dominant ferromagnetic interactions for 5 which shows the largest ground state reported to date in pyridyloximate chemistry (S = 14).