Synthesis, molecular structure and magnetic properties of [MnCrO(CHCO)(HO)]a4HO with A S = 8 ground state
Synthesis, molecular structure and magnetic properties of [MnCrO(CHCO)(HO)]a4HO with A S = 8 ground state
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A S = 8基态[MnCrO(CHCO)(H2O)]a4HO的合成、分子结构及磁性能
DOI：
10.1016/0277-5387(96)00061-7
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发表时间：
1996
期刊：
影响因子：
2.6
通讯作者：
Y. Kaipei
中科院分区：
文献类型：
--
作者：
L. Jinyu;X. Hao;Z. Jianzhong;X. Zheng;Y. Xiaozeng;Y. Kaipei
以K2 Cr2 O 7和Mn（OAc）2为原料，在CH 3CO 2 H/H2O混合溶剂中反应，合成了标题化合物[Mn 11 CrO 12（CH 3CO 2）16（H2O）4] ·4 H2O，测定了其晶体结构。晶体数据表明，存在三个晶体学上独立的金属原子Mn（1）、Mn（2）和Mn（3）。Mn（3）离子由四个Mn ~（4+）组成，它们与四个氧原子形成标题化合物的中心立方体。Mn（2）离子包括四个Mn 3+离子，Mn（1）离子代表三个Mn 3+离子和一个Cr 3+离子。Cr ~（3+）占据Mn（1）、Mn（1a）、Mn（1b）和Mn（1c）的各个位置，统计上Mn（1）= 1/4Cr+3/4 Mn。测定了标题配合物的变温磁化率。每个分子的有效磁矩（μeff）表明分子内存在铁磁交换作用，基态S = 8。
The title compound [Mn11CrO12(CH3CO2)16(H2O)4] ·4H2O was obtained by reaction of K2Cr2O7and Mn(OAc)2in CH3CO2H/H2O mixed solvent and its crystal structure was determined. The crystal data show that there are three crystallographical independent metal atoms Mn(1), Mn(2) and Mn(3). Mn(3) ions comprise four Mn4+, which with four oxygen atoms form the centre cube of the title compound. The Mn(2) ions comprise four Mn3+ions, Mn(1) ions represent three Mn3+ions and one Cr3+ion. The Cr3+ion occupied each site of Mn(1), Mn(1a), Mn(1b) and Mn(1c), statistically, so, Mn(1) = 1/4Cr+3/4Mn. Variable temperature magnetic susceptibilities of the title complex were determined. The effective magnetic moment (μeff) per molecule shows that there is intramolecular ferromagnetic exchange interaction with the ground state S = 8.