A dinuclear manganese(III) and a rare pentanuclear manganese(III) compound with a phenol-pyrazole ligand

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• 作者：Marta Viciano-Chumillas^a ; ^b ; ¹ ; Stefania Tanase^a ; ² ; Ilpo Mutikainen^c ; Urho Turpeinen^c ; L. Jos de Jongh^b ; ^{jongh@physics.leidenuniv.nl} ; Jan Reedijk^a ; ^d ; ^{reedijk@chem.leidenuniv.nl}
• 关键词：Manganese(III) complexes ; Pyrazole ligands ; Magnetic properties ; Ligand design
• 刊名：Polyhedron
• 出版年：2012
• 期刊代码：87_02775387
• 类别：ch
• 出版时间：11 May, 2012
• 卷：38
• 期：1
• 页码：178-184
• 文件大小：526 K

摘要

Reacting Mn(ClO₄)₂路6H₂O and H₂phpzEt (H₂phpzEt = 5(3)-(2-hydroxyphenyl)-3(5)-ethylpyrazole) in methanol in the presence of sodium hydroxide yields the compound [Mn₂(HphpzEt)₄(H₂O)₂](ClO₄)₂ (trong class="boldFont">1trong>). The pentanuclear [Mn₅(渭₃-O)₂(HphpzEt)₃(phpzEt)₃(OCH₃)(HOCH₃)₂(O₂CPh)] (trong class="boldFont">2trong>) is obtained when performing a similar reaction with Mn(O₂CPh)₂路2H₂O. Compound trong class="boldFont">1trong> consists of a symmetric dinuclear manganese(III) cationic unit, [Mn₂(HphpzEt)₄(H₂O)₂]²⁺ with two non-coordinated perchlorate anions. Compound trong class="boldFont">2trong> is a rare pentanuclear complex containing all the manganese ions in the oxidation state III and it also has 渭₃-oxido ligands. Temperature- and field-dependent magnetization studies indicate dominant antiferromagnetic interactions between the manganese(III) ions in both compounds.