...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Crystal growth & design >Novel Cu(II)-Based Frameworks Built from BIMAM and Oxalate: Syntheses, Structures, and Magnetic Characterizations (BIMAM = Bis(imidazol-yl) methylaminomethane)
【24h】

Novel Cu(II)-Based Frameworks Built from BIMAM and Oxalate: Syntheses, Structures, and Magnetic Characterizations (BIMAM = Bis(imidazol-yl) methylaminomethane)

机译：由BIMAM和草酸盐构建的新型基于Cu（II）的骨架：合成，结构和磁性表征（BIMAM =双（咪唑基）甲基氨基甲烷）

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Complexes with the formula [Cu(HBIMAM)(C2O4)](2)[CU(C2O4)(2)(OH2)(2)] (1) and [{Cu(HBIMAM)(OH2)(OClO3)}(2)(mu-C2O4)] (ClO4)(2) (2) have been synthesized from copper(II) perchlorate, bis(imidazol-yl) methylaminomethane (BIMAM), and oxalic acid by adjusting the ratio of the reagents. Compound I is an ion pair made up of binuclear cations [Cu-2(HBIMAM)(2)(C2O4)(2)](2+) and mononuclear anions [Cu(C2O4)(2)(OH2)(2)](2-), in which the oxalate acts as bidentate-monodentate and bidentate ligand, respectively. Neighboring cations and anions are connected to each other by a weak Cu-oxalate interaction and a significant H-bond, leading to a chain structure with the mononuclear anions sandwiched as bridges between the dimeric cations. The coordination of copper in the cationic and anionic moieties is very elongated square pyramidal and tetragonally elongated octahedral, respectively, with HBIMAM acting as a bidentate ligand in both. The intramolecular copper-copper distance within the cationic unit is 4.853(2) angstrom, while the shortest copper-copper interunit (cation-anion) separation within the chains is Cu(1)-Cu(2) = 5.231(2) angstrom. Compound 2 contains centrosymmetric binuclear cations and two nonbonded perchlorate counteranions. The two copper atoms are linked through a bisbidentate oxalate group leading to a metal-metal separation of 5.149(3) angstrom. The coordination stereochernistry of the copper ions can be described as a tetragonally elongated octahedron of the 4 + 1 + 1' type, in which the BIMAM acts as a bidentate ligand through two imidazole N atoms. The molecular building blocks (MBBs) in I and 2 are packed together by multiple-path H-bonding and pi-pi stacking interactions, giving rise to the supramolecular three-dimensional networks. EPR spectra are indicative of an essentially d(x2-y2) ground-state for the copper(II) ions in both compounds. Magnetic susceptibility measurements show antiferromagnetic exchange between the copper(II) ions, very weak in the case of compound 1 (J = -0.68(2) cm(-1)) and strong in compound 2 (J = -330 Cm-1). The magnitudes of the exchange interactions are discussed in relation to the structural features of each compound and compared with published magneto-structural data on similar oxalato-bridged copper(II) compounds.
机译：具有式[Cu（HBIMAM）（C2O4）]（2）[CU（C2O4）（2）（OH2）（2）]（1）和[{Cu（HBIMAM）（OH2）（OClO3）}（2 ）（mu-C2O4）]（ClO4）（2）（2）由高氯酸铜（II），双（咪唑基）甲基氨基甲烷（BIMAM）和草酸通过调节试剂的比例合成。化合物I是由双核阳离子[Cu-2（HBIMAM）（2）（C2O4）（2）]（2+）和单核阴离子[Cu（C2O4）（2）（OH2）（2）]组成的离子对。 （2-），其中草酸酯分别充当双齿-单齿和双齿配体。相邻的阳离子和阴离子通过弱的草酸铜相互作用和显着的H键相互连接，从而形成链结构，其中单核阴离子夹在二聚阳离子之间作为桥。阳离子和阴离子部分中铜的配位分别是非常细长的方形锥体和四边形八面体，而HBIMAM则同时充当双齿配体。阳离子单元内的分子内铜-铜距离为4.853（2）埃，而链内最短的铜-铜内部单元（阳离子-阴离子）间隔为Cu（1）-Cu（2）= 5.231（2）埃。化合物2包含中心对称的双核阳离子和两个非键的高氯酸根抗衡阴离子。两个铜原子通过一个双齿草酸盐基团连接，导致金属与金属的间距为5.149（3）埃。铜离子的配位立体化学可以描述为4 +1 + 1'型的四边形八面体，其中BIMAM通过两个咪唑N原子充当双齿配体。 I和2中的分子结构单元（MBB）通过多径H键和pi-pi堆积相互作用堆积在一起，从而形成了超分子三维网络。 EPR光谱表明两种化合物中铜（II）离子的基本d（x2-y2）基态。磁化率测量显示铜（II）离子之间的反铁磁交换，在化合物1的情况下非常弱（J = -0.68（2）cm（-1）），在化合物2的情况下很强（J = -330 Cm-1） 。讨论了与每种化合物的结构特征有关的交换相互作用的幅度，并将其与已发表的类似草酸酯桥联铜（II）化合物的磁结构数据进行了比较。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号