Managanese(III) in a pseudo-compressed mixed-donor octahedral environment: synthesis, X-ray crystal structure and physicochemical properties

Musa S. Shongwe; Sandy K. Vandayar; Manuel A. Fernandes; Helder M. Marques; Michael J. Morris; Sarah L. Heath

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Managanese(III) in a pseudo-compressed mixed-donor octahedral environment: synthesis, X-ray crystal structure and physicochemical properties

机译：拟压缩混合施主八面体环境中的锰（III）：合成，X射线晶体结构和理化性质

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The compound [C_5H_10NH_2] [MnL_2] [H_2L = N-(2-hydroxynaphthalen-l-yl)sarcosine] has been synthesized and characterised using single-crystal X-ray crystallography, spectroscopy and magmetic susceptibility measurements. The crystallographic asymmetric unit displays two similar, independent [MnL_2]~- complex ions linked via piperidinium cations through hydrogen bonding. The complex ions are alternating and arranged in two non-interacting parallel. Each of the complex ions is six-co-ordinate with the donor atoms, provided by the two bifunctional tridentate sarcosinato, being amine nitrogen atoms and carboxylate and naphtholate oxygen atoms. The anionic ligands are co-ordinated facially and are related by a crystallographic centre of inversion at the manganese ion. The mean bond distances Mn-O_(naphtholate) (1.885 A). Mn-O_(carboxylate) (2.069 A) and Mn-N_(amine) (2.198 A) for the two molecules point to a pseudo-compressed octahedral geometry about the Mn(III) ion consistent with a pseudo-Jahn-Teller compression. IR spectroscopy corroborates the unidentate co-ordination fashion of the carboxylate group of the sarcosinato ligand and confirms the presence of the piperidinium cation. The room temperature effective magnetic moment, (8_XT)~(1/2), is indicative of spin-only paramagnetism. As shown by the temperature dependence of the reciprocal of the magnetic susceptibility (X~(-1)), the magnetic behaviour of [C_5H_10NH_2] [MnL_2] in the temperature range 5-300 K is in conformity with the Cyrue-Weiss law, X = C/(T-#theta#), with #theta# = -012 K.

机译：合成了化合物[C_5H_10NH_2] [MnL_2] [H_2L = N-（2-羟基萘-1-基）肌氨酸]，并使用单晶X射线晶体学，光谱法和磁化率测量法对其进行了表征。晶体学不对称单元显示出两个相似的，独立的[MnL_2]〜-络合物离子，它们通过哌啶鎓阳离子通过氢键连接。络合离子是交替的，并以两个非相互作用的平行线排列。每个络合离子与由两个双官能三齿肌氨酸提供的供体原子六配位，它们是胺氮原子以及羧酸根和萘甲酸根氧原子。阴离子配体在表面上是配位的，并与锰离子上的反晶晶体中心有关。平均键距Mn-O_（萘甲酸）（1.885 A）。这两个分子的Mn-O_（羧酸盐）（2.069 A）和Mn-N_（胺）（2.198 A）指向关于Mn（III）离子的伪压缩八面体几何形状，与伪Jahn-Teller压缩一致。红外光谱证实了肌氨酸配体的羧酸根基团的不一致配位方式，并证实了哌啶鎓阳离子的存在。室温有效磁矩（8_XT）〜（1/2）表示仅自旋顺磁性。如磁化率（X〜（-1））的倒数的温度依赖性所示，[C_5H_10NH_2] [MnL_2]在5-300 K的温度范围内的磁行为符合Cyrue-Weiss律， X = C /（T-＃theta＃），其中＃theta＃= -012K。

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来源
《Polyhedron: The International Journal for Inorganic and Organometallic Chemistry》 |2001年第17期|共7页
作者
Musa S. Shongwe; Sandy K. Vandayar; Manuel A. Fernandes; Helder M. Marques; Michael J. Morris; Sarah L. Heath;
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正文语种 eng
中图分类化学;无机化学;
关键词
Manganese(III) complex; Jahn-Teller distortion; Magnetic susceptibility; Spectroscopy; X-ray crystallography;

机译：锰（III）配合物;Jahn-Teller畸变;磁化率;光谱学;X射线晶体学;

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Managanese(III) in a pseudo-compressed mixed-donor octahedral environment: synthesis, X-ray crystal structure and physicochemical properties

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