Bikas Rahman, Hosseini-Monfared Hassan, Vasylyeva Vera, Sanchiz Joaquín, Alonso Javier, Barandiaran Jose Manuel, Janiak Christoph
Department of Chemistry, University of Zanjan, 45195-313, Zanjan, I. R. Iran.
Dalton Trans. 2014 Aug 21;43(31):11925-35. doi: 10.1039/c4dt01390e.
Mixed-metal dicyanoargentate-bridged coordination polymers of Ag(i)-Mn(ii) have been prepared and their structure and magnetic properties were determined. Reaction of manganese(ii) chloride and potassium dicyanoargentate(i) with (X)(pyridin-2-ylmethylene)isonicotinohydrazide ligands (HL(1) X = Ph, HL(2) X = Me, HL(3) X = H) produced the coordination polymer 2D-[Mn(μ-L(1))(Cl)(μ-NCAgCN)Mn0.5(CH3OH)]n (), 1D-{[Mn(L(2))(Cl)(μ-NCAgCN)Mn0.5(CH3OH)]CH3OH}n () and [Mn(L(3))(Cl)(μ-NCAgCN)Mn0.5(CH3OH)]n () in good yields. Trinuclear {Mn(μ-L(1))Mn(μ-L(1))Mn} and Ag(CN)2 building units form a two-dimensional slab in and 1D strands in . Variable temperature magnetic susceptibility measurements showed that despite the long distance among the high spin Mn(ii) ions [10.4676(12) Å and 10.522(1) Å, for and , respectively], weak antiferromagnetic coupling takes place through the long NC-Ag-CN bridge. The best fit parameters to the model led to the magnetic coupling constant of J = -0.1 and J = -0.47 cm(-1) for and , respectively. The photoluminescence behaviour of compounds and was studied. The spectrum of compound shows a broad emission centered at about 450 nm and two excitation maxima at 270 and 310 nm.
已制备出银（I）-锰（II）的混合金属二氰基银桥联配位聚合物，并测定了它们的结构和磁性。氯化锰（II）和二氰基银酸钾（I）与（X）（吡啶-2-基亚甲基）异烟酰肼配体（HL(1) X = Ph，HL(2) X = Me，HL(3) X = H）反应，高产率地生成了配位聚合物二维-[Mn(μ-L(1))(Cl)(μ-NCAgCN)Mn0.5(CH3OH)]n（）、一维-{[Mn(L(2))(Cl)(μ-NCAgCN)Mn0.5(CH3OH)]CH3OH}n（）和[Mn(L(3))(Cl)(μ-NCAgCN)Mn0.5(CH3OH)]n（）。三核{Mn(μ-L(1))Mn(μ-L(1))Mn}和Ag(CN)2结构单元在中形成二维平板，在中形成一维链。变温磁化率测量表明，尽管高自旋锰（II）离子之间距离较长[分别为10.4676(12) Å和10.522(1) Å，对于和]，但通过长的NC-Ag-CN桥发生了弱反铁磁耦合。对模型的最佳拟合参数分别得出和的磁耦合常数J = -0.1和J = -0.47 cm(-1)。研究了化合物和的光致发光行为。化合物的光谱显示在约450 nm处有一个宽发射峰，在270和310 nm处有两个激发最大值。
