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首页> 外文期刊>Crystal growth & design >Dimension increase via hydrogen bonding and weak coordination interactions from simple complexes of 2-(Pyridyl)benzimidazole Ligands
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Dimension increase via hydrogen bonding and weak coordination interactions from simple complexes of 2-(Pyridyl)benzimidazole Ligands

机译:通过氢键和2-(吡啶基)苯并咪唑配体的简单配合物的弱配位相互作用增加尺寸

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摘要

Two asymmetric ligands, 2-(3-pyridyl)benzimidazole (3-PyBim) and 2-(4-pyridyl)benzin-tidazole (4-PyBim) which are positional isomers and versatile to provide both coordination donors (N-py and N-Bim) and hydrogen bonding sites (N-Bim and HNBim, were utilized to synthesize a series of transition metal complexes, namely [Ag-2(3-PyBim)(2)](X)(2) (X = BF4(-) (1), NO3- (2), ClO4- (3), CF3SO3- (4)), [Ag(4-PyBim)](NO3)center dot(H2O)(5), [Cu(3-PyBim)(2)(H2O)(2)](ClO4)(2) (6), [Co(3-PyBim)(2)(H2O)(4)](NO3)(2)center dot(H2O)(4)(7), [Cu(4-PyBim)(2)(Cl)(2)](H2O)(2) (8), [Zn(4-PyBim)(2)(H2O)(2)(NO3)(2)] (9), and [Cu-2(3-PyBim)(2)(OAC)(4)] (10). These simple complexes show diversified intermolecular interaction modes and can behave as basic structural units to be assembled into higher dimensional structures via dimension increasing. In complexes 1-4, every two Ag (I) atoms are connected by two 3-PyBim ligands to form a discrete [Ag-2(PyBim)(2)](2+) cyclic unit, while in complex 5, Ag (I) atoms are bridged by 4-PyBim ligands into a one-dimensional "zigzag" chain. This is due to positional isomerization of the ligands 3-PyBim and 4-PyBim, but they both display the similar end-to-end coordination mode. In contrast, these two ligands show the end-on coordination mode in complexes 6-9 with the Cu (II), Co (II), or Zn (II) ions taking on square or octahedral coordination geometries to form monomeric structural units containing one metal and two ligands, as well as additional water molecules or counteranions wherever necessary. In complex 10, the well-known dimetal paddle-wheel motif is formed with two Cu (II) ions adopting a square pyramidal geometry, but the two 3-PyBim ligands also take the same end-on coordination mode as that in complexes 6-9. The different coordination modes of the ligands in together with the influences from the counteranions play essential roles to propagate these basic structural units into 1D (1, 10), 2D (2-6, 8), or 3D (7, 9) frameworks via hydrogen bonding and other weak interactions. Thermogravimetric properties of some complexes were also measured.
机译:两个不对称配体,2-(3-吡啶基)苯并咪唑(3-PyBim)和2-(4-吡啶基)苯并噻唑(4-PyBim),它们是位置异构体,可以同时提供两个配位体(N-py和N -Bim)和氢键合位点(N-Bim和HNBim)用于合成一系列过渡金属配合物,即[Ag-2(3-PyBim)(2)](X)(2)(X = BF4( -)(1),NO3-(2),ClO4-(3),CF3SO3-(4)),[Ag(4-PyBim)](NO3)中心点(H2O)(5),[Cu(3- PyBim)(2)(H2O)(2)](ClO4)(2)(6),[Co(3-PyBim)(2)(H2O)(4)](NO3)(2)中心点(H2O) (4)(7),[Cu(4-PyBim)(2)(Cl)(2)](H2O)(2)(8),[Zn(4-PyBim)(2)(H2O)(2) (NO3)(2)](9)和[Cu-2(3-PyBim)(2)(OAC)(4)](10)。这些简单的配合物显示出多种分子间相互作用模式,可以作为基本结构单元在配合物1-4中,每两个Ag(I)原子通过两个3-PyBim配体连接形成离散的[Ag-2(PyBim)(2)](2+ )循环单元,而在络合物5中,Ag(I)原子是由4-PyBim配体桥接成一维“之字形”链。这是由于配体3-PyBim和4-PyBim的位置异构化,但是它们都显示出相似的端到端配位模式。相比之下,这两个配体在配合物6-9中表现出端基配位模式,其中铜(II),钴(II)或锌(II)离子采取正方形或八面体配位几何形状形成包含一个单体的结构单元金属和两个配体,以及必要时添加的水分子或抗衡阴离子。在配合物10中,众所周知的双金属桨叶图案是由两个采用方形金字塔形几何结构的Cu(II)离子形成的,但是两个3-PyBim配体也采用与配合物6-相同的端基配位模式。 9。配体的不同配位方式以及抗衡阴离子的影响起着至关重要的作用,可通过以下途径将这些基本结构单元传播到1D(1,10),2D(2-6,8)或3D(7,9)骨架中氢键和其他弱相互作用。还测量了某些配合物的热重性质。

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