Synthesis, structure, and magnetic properties of a new binuclear Ni(II) complex supported by 1,4,8-triazacycloundecane

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• 作者：Piotr L. Pawlak ; Aramice Y.S. Malkhasian ; Bojan Sjlivic ; Matthew J. Tiza ; Benjamin E. Kucera ; Reza Loloee ; Ferman A. Chavez
• 关键词：Macrocyclic ligand ; Ni(II) ; Binuclear complex ; X-ray crystallography ; UV– ; vis spectroscopy ; SQUID susceptometry
• 刊名：Inorganic Chemistry Communications
• 出版年：2008
• 出版时间：September 2008
• 年：2008
• 卷：11
• 期：9
• 页码：1023-1026
• 全文大小：271 K

文摘

A new synthetic binuclear nickel(II) compound ([Ni₂(tacud)₂(μ-H₂O)(μ-Cl)₂]Cl₂ (1); tacud = 1,4,8-triazacycloundecane) is reported. Compound 1 contains two Ni(II) ions bridged by two chloro and one aqua ligand resulting in a short Ni···Ni distance of 3.0187(10) Å. Each nickel is capped by terminal tacud ligands and possesses distorted octahedral geometry. This compound exhibits a new structural motif for metal complexes supported by tacud. Compound 1 exhibits two solvent dependent transitions in the UV–vis spectrum. Variable temperature SQUID magnetic susceptometry studies on 1 indicate mild ferromagnetism exists at room temperature (μ_eff = 4.78 μ_B) which increases upon temperature lowering. Magnetic analysis of 1 in the temperature range 2–300 K confirm weakly ferromagnetic behavior with J = +2.28 cm⁻¹.