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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >End-to-end single cyanato and thiocyanato bridged Cu(II) polymers with a new tridentate Schiff base ligand:Crystal structure and magnetic properties
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End-to-end single cyanato and thiocyanato bridged Cu(II) polymers with a new tridentate Schiff base ligand:Crystal structure and magnetic properties

机译:具有新的三齿Schiff碱配体的端到端单氰酸根和硫氰酸根桥连的Cu(II)聚合物:晶体结构和磁性

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A new tridentate Schiff base ligand HL (L = C_(14)H_(19)N_2O),derived from the condensation of benzoylacetone and 2-dimethylaminoethylamine in a 1 :1 ratio,reacts with copper(n) acetate and cyanate,thiocyanate or azide,to give rise to several end-to-end polymeric complexes of formulae [CuL(mu_(1,3)-NCO)]_n 1,[CuL(mu_(13)-NCS)]_n 2 and the complex 3 has two crystallographically independent units of formula [CuL(N_3)] in the.asymmetric unit cell.Complex 3 exists in dimeric form rather than as a polymeric chain.Compound 1 is the first report of a singly end-to-end cyanate bridged polymeric chain of Cu(II) with a Schiff base as a co-ligand.There are many examples of double NCS bridged polymeric chains,but fewer singly bridged ones such as compound 2.We have characterized these complexes by analytical,spectroscopic,structural and variable temperature magnetic susceptibility measurements.The coordination geometry around the Cu(II) centers is distorted square pyramidal for 1 and 2 and square planar for complex 3.The magnetic susceptibility data show slight antiferromagnetic coupling for the polymers having / values -0.19 and -0.57 cm~(-1) for complexes 1 and 2 respectively.The low values of J are consistent with the equatorial-axial disposition of the bridges in the polymers.
机译:一种新的三齿席夫碱配体HL(L = C_(14)H_(19)N_2O),是由苯甲酰丙酮和2-二甲基氨基乙胺按1:1的比例缩合制得,可与乙酸铜(n)和氰酸盐,氰酸盐,硫氰酸盐或叠氮化物,以生成几种式[CuL(mu_(1,3)-NCO)] _ n 1,[CuL(mu_(13)-NCS)] _ n 2的端对端聚合物配合物,而配合物3具有在不对称晶胞中有两个晶体学上独立的式[CuL(N_3)]单元。络合物3以二聚体形式而不是聚合物链形式存在。化合物1是单端到端氰酸酯桥连聚合物链的第一个报道。具有席夫碱作为共配体的Cu(II)的例子。有许多双NCS桥连的聚合物链的例子,但单桥的化合物如化合物2较少。我们通过分析,光谱,结构和可变温度对这些配合物进行了表征磁化率测量.Cu(II)中心周围的配位几何畸变为1和2的方形锥体和正方形配合物1和2的/值分别为-0.19和-0.57 cm〜(-1)的聚合物的磁化率数据显示轻微的反铁磁耦合.J的低值与赤道轴向排列一致在聚合物中的桥。

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