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Ferromagnetic Interaction in mu_(1,3)-Cyanamido-Derived Copper(II)Cryptates

机译:mu_(1,3)-氰基氨基化铜(II)加密物中的铁磁相互作用

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摘要

The reaction of dinuclear copper(II)cryptates with calcium cyan-amide,CaNCN,and sodium dicyanalpha-mide,Na[N(CN)_2]results in dinuclear compounds of formulae[Cu_2(HNCN)-(R3Bm)](ClO_4)_3(1),[Cu_2(dca)-(R3Bm)](C1O_4)_3-4H_20(2),and[Cu_2(NCNCONH_2)(R3Bm)](CF_3SO_3)_3(3),in which R3Bm = N[(CH_2)_2-NHCH_2(C_6H_4-m)CH_2NH(CH_2)_2]_3N and dca = dicyanamido ligand(NCNCN~-).The X-ray diffraction analysis reveals for both 1 and 3 a dinuclear entity in which the copper atoms are bridged by means of the-NCN-unit.The molar magnetic susceptibility measurements of 1-3 in the 2-300 K range indicate ferromagnetic coupling.The calculated J values,by using theoretical methods based on density functional theory(DFT)are in excellent agreement with the experimental data.Catalytic hydralpha-tion of a nitrile to an amide functional group is assumed responsible for the formation of 3 from a mu_(1,3)-dicyanamido ligand.
机译:双核铜(II)与氰化钙钙,CaNCN和双氰基甲酰胺钠[Na [N(CN)_2]的反应生成式[Cu_2(HNCN)-(R3Bm)](ClO_4)的双核化合物_3(1),[Cu_2(dca)-(R3Bm)](C1O_4)_3-4H_20(2)和[Cu_2(NCNCONH_2)(R3Bm)](CF_3SO_3)_3(3),其中R3Bm = N [( CH_2)_2-NHCH_2(C_6H_4-m)CH_2NH(CH_2)_2] _3N和dca =双氰胺配体(NCNCN〜-)。X射线衍射分析显示1和3都有一个双核实体,其中铜原子桥连在一起。在2-300 K范围内的1-3的摩尔磁化率测量值表明铁磁耦合。使用基于密度泛函理论(DFT)的理论方法计算出的J值非常吻合带有腈基的酰胺化反应被认为是由mu_(1,3)-dicyanamido配体形成3的原因。

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