Syntheses,crystal structures,ferroelectrics and magnetic properties of [R-BzPy]_2[Cu(mnt)_2]complexes([R-BzPy]~+=l-(4'-R-benzyl)-pyridinium,R=NO_2 or Br;mnt~(2-)=maleonitriledithiolate)

Xiaoming Ren; Jing Ma; Changsheng Lu; Senzu Yang; Qingjin Meng; Peiheng Wu

首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Syntheses,crystal structures,ferroelectrics and magnetic properties of [R-BzPy]_2[Cu(mnt)_2]complexes([R-BzPy]~+=l-(4'-R-benzyl)-pyridinium,R=NO_2 or Br;mnt~(2-)=maleonitriledithiolate)

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Syntheses,crystal structures,ferroelectrics and magnetic properties of [R-BzPy]_2[Cu(mnt)_2]complexes([R-BzPy]~+=l-(4'-R-benzyl)-pyridinium,R=NO_2 or Br;mnt~(2-)=maleonitriledithiolate)

机译：[R-BzPy] _2 [Cu（mnt）_2]复合物（[R-BzPy]〜+ = 1-（4'-R-苄基）-吡啶，R = NO_2或的合成，晶体结构，铁电和磁性Br; mnt〜（2-）=顺丁烯二腈）

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The structures of two ion-pair complexes,which consist of l-(4'-R-benzyl)pyridinium(R=NO_2(1),Br(2))and bis(maleonitriledithiolato)cuprate~(II),have been determined by X-ray single crystal analyses,and the results show the stacking patterns in 1 and 2 are different from each other although the difference between the molecular structures of these complexes is only the substituent of the benzene ring,which may arise from the difference of interactions between cations and anions in these two complexes.Complex 1 crystallizes in the non-centrosymmetric space group P1,and dielectric measurements shows ferroelectric behavior with a small hysteresis loop.Quantum chemistry calculation further indicate the electric dipole in a unit cell is 56.5509 Debye,and DSC analysis reveal a T_c of 377 K,from the paraelectric to the ferroelectric phase.The magnetic susceptibilities of these two complexes measured in the temperature range 1.8-260 K show an antiferromagnetic coupling feature between neighboring Cu~(II)ions with 6=-0.580 K for 1 and -2.167 K for 2.The polycrystalline EPR spectra of the two complexes at room temperature are different from each other,characterized axial g tensors are g_(||)of 2.09,g_(perpendicular)of 2.02 for 1,and g_(||)=2.05,g_(perpendicular)=2.03,A_(||)=40.6X 10~(-4)cm~(-1)for 2.

机译：已经确定了由I-（4'-R-苄基）吡啶鎓（R = NO_2（1），Br（2））和双（马来三烯二硫代巯基）铜酸盐〜（II）组成的两个离子对络合物的结构。通过X射线单晶分析，结果表明1和2的堆积方式互不相同，尽管这些配合物的分子结构差异仅仅是苯环的取代基，这可能是由于苯环的差异引起的。络合物1在非中心对称的空间群P1中结晶，介电测量显示铁电行为具有小的磁滞回线。量子化学计算进一步表明，晶胞中的电偶极子为56.5509德拜， DSC分析表明，从顺电相到铁电相的T_c为377 K.在温度范围1.8-260 K范围内测得的这两种配合物的磁化率显示了邻域蛋白之间的反铁磁耦合特征g Cu〜（II）离子，1 = 6 = -0.580 K，2 = -2.167 K.室温下，两种络合物的多晶EPR谱互不相同，表征的轴向g张量为g_（||） 2.09，g_（垂直）等于2.02（1），g_（||）= 2.05，g_（垂直）= 2.03，A_（||）= 40.6X 10〜（-4）cm〜（-1）2。

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《Dalton transactions: An international journal of inorganic chemistry》 |2003年第7期|共7页
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Xiaoming Ren; Jing Ma; Changsheng Lu; Senzu Yang; Qingjin Meng; Peiheng Wu;
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Syntheses,crystal structures,ferroelectrics and magnetic properties of [R-BzPy]_2[Cu(mnt)_2]complexes([R-BzPy]~+=l-(4'-R-benzyl)-pyridinium,R=NO_2 or Br;mnt~(2-)=maleonitriledithiolate)

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