Copper(II) complexes with monocarboxylate ligands bearing different substituent groups: Synthesis and spectroscopic studies

Copper(II) complexes with monocarboxylate ligands bearing different substituent groups: Synthesis and spectroscopic studies
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具有不同取代基的单羧酸配体的铜(II)配合物:合成和光谱研究

DOI:
10.1016/j.ica.2010.01.043
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发表时间:
2010-04
影响因子:
2.8
通讯作者:
Hu, Tong-Liang
Hu, Tong-Liang
中科院分区:
化学3区
文献类型:
--
作者:
Zhang, Ai-Shun;Wang, Jun-Jie;Chang, Ze;Bu, Xian-He;Hu, Tong-Liang

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在探索配体取代基在超分子配位结构形成中的作用的基础上,我们合成了7个新的Cu Ⅱ配合物,其结构式分别为[Cu_2(L_1)_4(DMF)_2](1),{[Cu_2(L_1)_4(H_2O)]_(0.75)}_∞(2),[Cu_2(L_2)_4(DMF)_2(2,2 ′-bipy)2](3)、[Cu2(L3)4(H2O)2](4)、[Cu2(L3)4(H2O)2]∞(5)、[Cu2(L3)4(Dabco)]∞(6)和[Cu2(L3)4(Pz)]∞(7(HL 1 =菲-9-羧酸,HL 2 =2-苯基喹啉-4-羧酸,HL 3 =金刚烷-1-羧酸,H2O =六亚甲基四胺,2,2 ′-bipy = 2,2 ′-联吡啶,Dabco= 1,4-二氮杂双环[2.2.2]辛烷和Pz=吡嗪),制备并通过X射线衍射进行表征。在1、2和4-7中,每个Cu III离子是八面体配位的,并且羧酸充当顺式-顺式桥接双齿配体。而3中的每个CuIII离子都是五配位的,呈扭曲的四方锥几何结构。1和4都显示了双核桨轮单元,而2、5、6和7都显示了在四羧酸型Cu 2-(RCO 2)4的双核桨轮单元和桥连辅助配体H2O、Dabco和Pz之间交替的一维链结构。此外,3与螯合辅助配体2,2 ′-bipy形成了羧基单齿和μ 1,1-氧代桥联双核结构.此外,配合物1-6通过电子顺磁共振(EPR)光谱进行了表征。
In our continuing efforts to explore the effects of substituent groups of ligands in the formation of supramolecular coordination structures, seven new CuIIcomplexes formulated as [Cu2(L1)4(DMF)2] (1), {[Cu2(L1)4(Hmta)](H2O)0.75}∞(2), [Cu2(L2)4(2,2′-bipy)2] (3), [Cu2(L3)4(H2O)2] (4), [Cu2(L3)4(Hmta)]∞(5), [Cu2(L3)4(Dabco)]∞(6) and [Cu2(L3)4(Pz)]∞(7) with three monocarboxylate ligands bearing different substituent groups HL1–HL3(HL1=phenanthrene-9-carboxylic acid, HL2=2-phenylquinoline-4-carboxylic acid, HL3=adamantane-1-carboxylic acid, Hmta=hexamethylenetetramine, 2,2′-bipy = 2,2′-bipyridine, Dabco=1,4-diazabicyclo[2.2.2] octane and Pz=pyrazine), have been prepared and characterized by X-ray diffraction. In 1, 2 and 4–7, each CuIIion is octahedrally coordinated, and carboxylate acid acts as a syn–syn bridging bidentate ligand. While each CuIIion in 3 is penta-coordinated in a distorted square-pyramidal geometry. 1 and 4 both show a dinuclear paddle-wheel block, while 2, 5, 6 and 7 all exhibit an alternated 1D chain structure between dinuclear paddle-wheel units of the tetracarboxylate type Cu2-(RCO2)4and the bridging auxiliary ligands Hmta, Dabco and Pz. Furthermore, 3 has a carboxylic unidentate and μ1,1-oxo bridging dinuclear structure with the chelating auxiliary ligand 2,2′-bipy. Moreover, complexes 1–6 were characterized by electron paramagnetic resonance (EPR) spectroscopy.
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发表时间: 2009-01-23
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影响因子: --
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影响因子: 4.9
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影响因子: 4.6
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