Chemical assembly of an antiferromagnetic macrocyclic molecule containing two inner Co^II centers from polymeric cobalt pivalate

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• 作者：Konstantin Tokarev ; Mikhail Kiskin ; Aleksei Sidorov ; Grygory Aleks ; rov ; Artem Bogomyakov ; Vladimir Novotortsev ; Igor Eremenko
• 关键词：Coordination polymer ; Binuclear complexes ; Transition metals ; Carboxylate ligands ; Amine ligand ; Schiff-base macrocycle ; X-ray study ; Magnetic measurements
• 刊名：Polyhedron
• 出版年：2009
• 出版时间：22 June 2009
• 年：2009
• 卷：28
• 期：9-10
• 页码：2010-2016
• 全文大小：655 K

文摘

The reaction of the polymer {Co(Piv)₂}_n (Piv is the pivalic acid anion) with triethylenetetramine (L¹) (M:L¹ = 2:1) in MeCN affords the polymeric compound [Co₂L¹(η²-Piv)₂(μ-Piv)₂]_n (1) containing asymmetric dicobalt units coordinated by one chelate ligand L¹. The reaction of 1 with an additional amount of L¹ (M:L¹ = 1:1) in MeCN gives rise to the binuclear molecule Co₂(Piv)₄ (2), where L¹ acts as a chelate-bridging ligand. Compounds analogous to 2 with M = Fe (3) were prepared by the reaction of the polymer {Fe(Piv)₂}_n with L¹ in MeCN using the reagent ratio M:L¹ = 1:1. The reaction of the compound Co(Piv)₄ (2) with isophthalaldehyde (L²) produces the binuclear complex Co₂L³(Piv)₄ (4) containing the new [2 + 2] macrocyclic ligand L³ as a result of condensation of L¹ with L². All newly synthesized compounds were characterized by X-ray diffraction and magnetic measurements.