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Three-Dimensional Supramolecular Architectures with Co-II Ions Assembled from Hydrogen Bonding and pi center dot center dot center dot pi Stacking Interactions: Crystal Structures and Antiferromagnetic Properties

机译:由氢键和pi中心点pi中心点pi组成的Co-II离子的三维超分子体系结构相互作用:晶体结构和反铁磁性

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摘要

Five Co-II complexes based on H3L1 and H3L2, namely, [Co-3(L-1)(2)(4,4'-bipy)(H2O)(3)](n) (1), [Co-3(L-1)(2)(4,4'-bipy)(3)(H2O)(4)](n) (2), {[Co-2(Li)(4,4'-bibp)(mu(3)-OH)(H2O)]center dot H2O}(n) (3), {[CO3(L-2)(2)(dib)(3)]center dot 2H(2)O}(n) (4), and [CO3(L-2)(2)(4,4'-bibp)(3)](n) (5) [(H3L1 = 4-[(3-carboxynaphthalen-2-yl)oxy]phthalic acid, H3L2 = 3-[(3-carboxynaphthalen-2-yl)oxy]phthalic acid, 4,4'-bipy = 4,4'-bipyridine, cub = 1,4-di(1H-imidazol-1-yl) benzene, and 4,4'-bibp = 4,4'-bis(imidazol)biphenyl] have been synthesized by solvothermal reactions. Complex 1 displays a (4,4,6) connected topology with a Schlafli symbol of (4.10(4).12)(4(11).6(4))(4(8).6)(2,) and the two-dimensional (2D) structure was assembled to form a three-dimensional (3D) framework by C-H center dot center dot center dot pi interactions of internaphthalene rings, showing the dominant antiferromagnetic exchanges in a triangular {Co3} cluster. Complex 2 presents a 2D (3,4,4)-connected network with a Schlafli symbol of (5.6(2))(2)(5(2).6(3).7)(2)(5(4).8(2)) and weakly antiferromagnetic behavior. Complex 3 features a novel (4,4,8)-connected topology with a Schlafli symbol of (3(2).4.5(2).6)(2)(3(2).4(2).5(2))(2)(3(4).4(6).5(8).6(7).7(2).8). In addition, complex 3 based on a parallelogram-shaped [Co-4(mu(3)-OH)(2)](6) secondary building unit provides antiferromagnetic interactions mediated by mu(3)-OH and syn-syn-COO- groups. The driving forces in 3D supramolecular frameworks are C-H center dot center dot center dot O, C-H center dot center dot center dot pi, and pi center dot center dot center dot pi stacking interactions for 2-3. Complexes 4-5 have an identical (4,4,5)-connected 2D network with a Schlafli symbol of (4.6(4).8)(4(2).6(7).8)(2)(4(4).6(2))(2). Additionally, the C-H center dot center dot center dot O hydrogen bonds between naphthalene rings and uncoordinated carboxy oxygen atoms extend 2D networks into 3D supramolecular frameworks. Magnetic investigations reveal that 4 and 5 exhibit antiferromagnetic interactions in the linear {Co3} unit.
机译:基于H3L1和H3L2的五种Co-II配合物,即[Co-3(L-1)(2)(4,4'-bipy)(H2O)(3)](n)(1),[Co- 3(L-1)(2)(4,4'-bipy)(3)(H2O)(4)](n)(2),{[Co-2(Li)(4,4'-bibp) (mu(3)-OH)(H2O)]中心点H2O}(n)(3),{[CO3(L-2)(2)(dib)(3)]中心点2H(2)O}( n)(4)和[CO3(L-2)(2)(4,4'-bibp)(3)](n)(5)[(H3L1 = 4-[(3-羧萘-2-基)氧基]邻苯二甲酸,H3L2 = 3-[((3-羧基萘-2-基)氧基]邻苯二甲酸,4,4'-联吡啶= 4,4'-联吡啶,cub = 1,4-二(1H-咪唑)溶剂热反应合成了-1-基苯和4,4'-bibp = 4,4'-双(咪唑)联苯。配合物1显示(4,4,6)连接的拓扑结构,带有Schlafli符号(4.10(4).12)(4(11).6(4))(4(8).6)(2,)的二维结构组装成三维(通过萘中心环的CH中心点中心点中心点pi相互作用的3D)框架,显示了三角形{Co3}簇中的主要反铁磁交换复合体2呈现了一个带有Schlafli s的2D(3,4,4)连接的网络(5.6(2))(2)(5(2).6(3).7)(2)(5(4).8(2))的符号和弱铁磁行为。复杂3具有新颖的(4,4,8)连接拓扑,其Schlafli符号为(3(2).4.5(2).6)(2)(3(2).4(2).5(2) ))(2)(3(4).4(6).5(8).6(7).7(2).8)。此外,基于平行四边形的[Co-4(mu(3)-OH)(2)](6)二级结构单元的复合物3提供了由mu(3)-OH和syn-syn-COO介导的反铁磁相互作用-组。 3D超分子框架的驱动力是2-3的C-H中心点中心点中心点O,C-H中心点中心点中心点pi和pi中心点中心点中心点pi堆叠相互作用。配合物4-5具有相同的(4,4,5)连接的2D网络,其Schlafli符号为(4.6(4).8)(4(2).6(7).8)(2)(4( 4).6(2))(2)。另外,萘环和未配位的羧基氧原子之间的C-H中心点中心点中心点O氢键将2D网络延伸到3D超分子框架中。磁性研究表明4和5在线性{Co3}单元中表现出反铁磁相互作用。

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