Manganese tetraphenylporphyrin bromide and iodide. Studies of structures and magnetic properties

Manganese tetraphenylporphyrin bromide and iodide. Studies of structures and magnetic properties
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四苯基卟啉溴化物和碘化物。

DOI:
10.1016/j.poly.2020.114488
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发表时间:
2020
期刊:
影响因子:
2.6
通讯作者:
Podlesnyak, Andrey A.
Podlesnyak, Andrey A.
中科院分区:
化学3区
文献类型:
--
作者:
Bone, Alexandria N.;Stavretis, Shelby E.;Krzystek, J.;Liu, Zhiming;Chen, Qiang;Gai, Zheng;Wang, Xiaoping;Steren, Carlos A.;Powers, Xian B.;Podlesnyak, Andrey A.

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四苯基卟啉溴化锰和碘化物Mn(Tpp)X(X = Br2;I,3;TPP2−=均四苯基卟啉)是合成的锰(Ⅲ)地卟啉类似物。化合物2和3的晶体结构分别为:晶格中含有氯仿的Mn(TPP)Br·CHCl3(2·CHCl3)、Mn(TPP)I·CHCl3(3·CHCl3)、Mn(TPP)I·CDCl3(3·CHCl3)、Mn(TPP)I·1.5CHCl3(3·1.5CHCl3),以及晶格中含有二氯甲烷的2,Mn(TPP)Br.CH2Cl2(2·CH2Cl2),在100 K或298 K下用单晶X射线衍射法测定了它们的晶体结构。令人惊讶的是,Mn(Tpp)X(2-3)中的Mn(Ⅲ)-bR和mN(Ⅲ)-I键比Fe(Ⅲ)-bR和Fe(Ⅲ)-i键Ins= 5/2Fe(Tpp)X(X = bR,4;I,5)长约0.2%(8%),尽管Mn(Ⅲ)和Fe(III)离子具有相同的半径。通过直流(DC)和交流(AC)磁化率测量、高场电子顺磁共振(HFEPR)和非弹性中子散射(INS)研究了化合物2和3的磁性。在Mn(Tpp)X(X = BR,2;I,3),溴化物络合物2In_2·CDCl3具有易轴各向异性,与氯化物类似物Mn(Tpp)Cl(1)一样,轴向(D)和菱形(E)零场分裂参数分别为d= -1.091(3)cm−1和|E|= 0.087(2)cm−1。碘化物络合物3In 3·CDCl3变为易面,D= +1.3(1)cm−1和|E|= 0.010(5)cm−1。轴向零场分裂参数由先前报道的−2.290(5)cm−1变化。至−1.091(3)厘米−1英寸2和+1.3(1)厘米−1英寸3。
Manganese tetraphenylporphyrin bromide and iodide Mn(TPP)X (X = Br,2; I,3; TPP2−=meso-tetraphenylporphyrinate) are synthetic analogs of Mn(III) geoporphyrins. Crystal structures of2and3with chloroform in the lattices, Mn(TPP)Br·CHCl3(2·CHCl3), Mn(TPP)I·CHCl3(3·CHCl3), Mn(TPP)I·CDCl3(3·CDCl3in a different space group from3·CHCl3), Mn(TPP)I·1.5CHCl3(3·1.5CHCl3), and2with dichloromethane in the lattice, Mn(TPP)Br·CH2Cl2(2·CH2Cl2), have been determined by single-crystal X-ray diffraction at 100 K or 298 K. Hirshfeld surface analyses of the crystal structures of2·CHCl3,2·CH2Cl2,3·CHCl3,3·CDCl3and3·1.5CHCl3have been performed. Surprisingly the Mn(III)–Br and Mn(III)–I bonds in Mn(TPP)X (2–3) are about 0.2 Å (8%) longer than Fe(III)–Br and Fe(III)–I bonds inS= 5/2 Fe(TPP)X (X = Br,4; I,5), although both Mn(III) and Fe(III) ions have the same radii. Magnetic properties of2and3have been studied by direct current (DC) and alternating current (AC) susceptibility measurements, high-field electron paramagnetic resonance (HFEPR), and inelastic neutron scattering (INS). With four unpaired electrons in Mn(TPP)X (X = Br,2; I,3), the bromide complex2in2·CDCl3possesses easy-axis anisotropy, as does the chloride analog Mn(TPP)Cl (1), with the axial (D) and rhombic (E) zero-field splitting parameters ofD= –1.091(3) cm−1and |E|= 0.087(2) cm−1. The iodide complex3in3·CDCl3becomes easy-plane withD= +1.30(1) cm−1and |E|= 0.010(5) cm−1. Axial ZFS parametersDchange from −2.290(5) cm−1in1, reported earlier, to −1.091(3) cm−1in2and +1.30(1) cm−1in3.
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