Dangling and Hydrolyzed Ligand Arms in [Mn3] and [Mn6] Coordination Assemblies: Synthesis, Characterization, and Functional Activity.

Dangling and Hydrolyzed Ligand Arms in [Mn3] and [Mn6] Coordination Assemblies: Synthesis, Characterization, and Functional Activity.
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[Mn3] 和 [Mn6] 配位组装中的悬空和水解配体臂:合成、表征和功能活性。

DOI:
10.1021/acs.inorgchem.6b02813
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发表时间:
2017
影响因子:
4.6
通讯作者:
Chattopadhyay K
Chattopadhyay K
中科院分区:
化学2区
文献类型:
--
作者:
Chattopadhyay K

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在配体H3 L1和H5 L2中利用围绕苯酚主链的两个柔性的、支化的和空间受限的二脚架和三脚架侧臂来分离{Mn 6}和{Mn 3}配位聚集体。2,6-双{(1-羟基-2-甲基丙-2-基亚氨基)甲基}-4-甲基苯酚(H_3L_1)得到三核配合物[Mn_3(μ-H_2L_1)_2(μ 1,3-O2 CCH 3)4(CH 3OH)2](ClO 4)2·4CH 3OH(1),而2,6-双[{1-羟基-2-(三氟甲基)苯基}(羟甲基)丁-2-亚氨基}甲基]-4-甲基苯酚(H5 L2)生成六核配合物[Mn 6(μ4-H2 L2)2(μ-HL 3)2(μ3-OH)2(μ 1,3-O2 CC 2 H5)4](ClO 4)2·2 H2O(2)。乙酸盐的结合和{H2 L1}−的配位提供了1中的线性MnIIIMnIIMnIII排列。通过丙酸根桥、{H2 L2}3-配位和原位生成的{HL 3}2-,在2中得到了MnIII 6稠合的二金刚烷型组装体. 1和2的磁性表征揭示了分子内反铁磁交换相互作用所主导的性质,这一点用密度泛函理论计算得到了证实。由于Mn Ⅲ心的轴向各向异性,配合物1在2 K时表现出慢磁弛豫.这两种配合物显示出有效的溶剂依赖性邻苯二酚氧化朝向3,5-二叔丁基邻苯二酚在空气中。两种不同核性和结构的配合物的邻苯二酚氧化能力相当。
Two flexible, branched, and sterically constrained di- and tripodal side arms around a phenol backbone were utilized in ligands H3L1 and H5L2 to isolate {Mn6} and {Mn3} coordination aggregates. 2,6-Bis{(1-hydroxy-2-methylpropan-2-ylimino)methyl}-4-methylphenol (H3L1) gave trinuclear complex [Mn3(μ-H2L1)2(μ1,3-O2CCH3)4(CH3OH)2](ClO4)2·4CH3OH (1), whereas 2,6-bis[{1-hydroxy-2-(hydroxymethyl)butan-2-ylimino}methyl]-4-methylphenol (H5L2) provided hexanuclear complex [Mn6(μ4-H2L2)2(μ-HL3)2(μ3-OH)2(μ1,3-O2CC2H5)4](ClO4)2·2H2O (2). Binding of acetates and coordination of {H2L1}−provided a linear MnIIIMnIIMnIIIarrangement in1. A MnIII6fused diadamantane-type assembly was obtained in2from propionate bridges, coordination of {H2L2}3–, and in situ generated {HL3}2–. The magnetic characterization of1and2revealed the properties dominated by intramolecular anti-ferromagnetic exchange interactions, and this was confirmed using density functional theory calculations. Complex1exhibited field-induced slow magnetic relaxation at 2 K due to the axial anisotropy of MnIIIcenters. Both the complexes show effective solvent-dependent catechol oxidation toward 3,5-di-tert-butylcatechol in air. The catechol oxidation abilities are comparable from two complexes of different nuclearity and structure.
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