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首页> 外文期刊>Polyhedron: The International Journal for Inorganic and Organometallic Chemistry >Synthesis, structural investigations and magnetic properties of dipyridinated manganese phthalocyanine, MnPc(py)(2)
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Synthesis, structural investigations and magnetic properties of dipyridinated manganese phthalocyanine, MnPc(py)(2)

机译:二吡啶锰酞菁MnPc(py)(2)的合成,结构研究和磁性

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The MnPc(py)(2) complex was obtained in the reaction of MnPc with purified and dry pyridine under non-oxidation conditions. It crystallises in the centrosymmetric space group P2(1)/c of the monoclinic system with two molecules per unit cell. The Mn2+ cation is coordinated by four N-isoindole atoms of phthalocyaninato(2-) macrocycle and axially by two nitrogen atoms of pyridine molecules into a tetragonal bipyramid. The MnPC(py)(2) crystals are moderately stable under air, but in pyridine solution the MnPC(py)2 complex undergoes oxidation by O-2 Yieldings the binuclear manganese(III) mu-oxo complex (MnPcpy)(2)O as evidenced by the UV-Vis spectroscopy. The magnetic susceptibility measurement performed on solid sample of MnPC(py)(2) shows the Curie-Weiss behaviour in the temperature region of 300-15 K. The calculated magnetic moment mu(eff) indicates three impaired electrons (S = 3/2), thus the ground state configuration of Mn ion is (a(Ig))(2)(e(g))(2)(b(2g))(1), and the MnPc(py)(2) complex is the intermediate spin complex. Below 5.5 K (T-N) the magnetic susceptibility sharply decreases due to the cooperative intermolecular antiferromagnetic interactions. (C) 2003 Elsevier Ltd. All rights reserved. [References: 68]
机译:MnPc(py)(2)配合物是在非氧化条件下,将MnPc与纯化和干燥的吡啶反应制得的。它在单斜晶系的中心对称空间群P2(1)/ c中结晶,每个单元格有两个分子。 Mn2 +阳离子由酞菁基(2-)大环的四个N-异吲哚原子配位,并由吡啶分子的两个氮原子轴向配位成四方双锥体。 MnPC(py)(2)晶体在空气中中等稳定,但在吡啶溶液中,MnPC(py)2络合物通过O-2氧化,生成双核锰(III)mu-oxo络合物(MnPcpy)(2)O如紫外-可见光谱所证明的。对MnPC(py)(2)固体样品进行的磁化率测量显示,在300-15 K的温度范围内,居里-魏斯行为。计算出的磁矩mu(eff)表示三个受损的电子(S = 3/2) ),因此Mn离子的基态构型为(a(Ig))(2)(e(g))(2)(b(2g))(1),而MnPc(py)(2)络合物为中间自旋复合体。低于5.5 K(T-N),由于协同分子间反铁磁相互作用,磁化率急剧下降。 (C)2003 Elsevier Ltd.保留所有权利。 [参考:68]

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