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首页> 外文期刊>Crystal growth & design >Six Flexible and Rigid Co(II) Coordination Networks with Dicarboxylate and Nicotinamide-Like Ligands: Impact of Noncovalent Interactions in Retention of Dimethylformamide Solvent
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Six Flexible and Rigid Co(II) Coordination Networks with Dicarboxylate and Nicotinamide-Like Ligands: Impact of Noncovalent Interactions in Retention of Dimethylformamide Solvent

机译:与二羧酸盐和烟酰胺样配体的六个灵活和刚性的Co(II)配位网络:非共价相互作用对保留二甲基甲酰胺溶剂的影响

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摘要

Six mixed-ligand Co (II) coordination polymers, {[Co (adi) (iso-nia)(2)]center dot dmf}(n) (1), [Co (adi) (iso-nia)(2)](n) (2), {[Co-2(suc)(ac)(2)(iso-nia)(4)] [Co-2(suc)(SUCH)(2)(iso-nia)(4)]center dot 2dmf} (3), [Co(adi)(nia)(2)] (4), {[Co(bdc)(nia)(2)]center dot dmf}(n) (5), and {[Co(mal)(S-nia)(H2O)]center dot dmf}(n) (6), were synthesized and characterized by single crystal X-ray analysis. They are based on four dicarboxylic acids, namely, malonic (H(2)mal), succinic (H(2)suc), adipic (H(2)adi), and 1,4-benzenedicarboxylic (H(2)bdc) acids, as well as three nicotinamide-like ligands, isonicotinamide (iso-nia), nicotinamide (nia) and thionicotinamide (S-nia). Compounds 1, 2, and 3 represent one-dimensional coordination polymers, whereas 4, 5, and 6 exhibit two-dimensional structures. The coordination arrays in 1-5 are built from the similar [Co-2(COO)(2)] binuclear clusters, while framework 6 is based on mononuclear metal nodes. All crystal lattices are supported by hydrogen bonding with nicotinamide-like ligands acting as pillars or dangling terminal ligands. Four crystal lattices 1, 3, 5, and 6 host dmf solvent via NH center dot center dot center dot O hydrogen bonding and pi-pi stacking interactions with the coordination networks. Details of the reversible dmf release-uptake by 1 and 2, and contribution of hydrogen bonding in stabilization of the solvent-free structures 2 and 4 are discussed. All new solids were characterized by IR spectroscopy and thermogravimetric analysis, while magnetic measurements are reported for compounds 1, 5, and 6. The magnetic data show the typical behavior of Co(II) ions originating from pronounced zero-field splitting within the ground state with contributing effects from weak antiferromagnetic exchange interactions.
机译:六种混合配体Co(II)配位聚合物,{[Co(adi)(iso-nia)(2)]中心点dmf}(n)(1),[Co(adi)(iso-nia)(2) ](n)(2),{[Co-2(suc)(ac)(2)(iso-nia)(4)] [Co-2(suc)(SUCH)(2)(iso-nia)( 4)]中心点2dmf}(3),[Co(adi)(nia)(2)](4),{[Co(bdc)(nia)(2)]中心点dmf}(n)(5) ,和{[Co(mal)(S-nia)(H2O)]中心点dmf}(n)(6)合成并通过单晶X射线分析表征。它们基于四种二羧酸,即丙二酸(H(2)mal),琥珀酸(H(2)suc),己二酸(H(2)adi)和1,4-苯二甲酸(H(2)bdc)酸,以及三个烟酰胺样配体:异烟酰胺(iso-nia),烟酰胺(nia)和亚硫酰胺(S-nia)。化合物1、2和3代表一维配位聚合物,而4、5和6则表现出二维结构。 1-5中的协调阵列是从类似的[Co-2(COO)(2)]双核簇构建的,而框架6是基于单核金属节点的。所有晶格均通过与充当支柱或悬空末端配体的烟酰胺样配体的氢键键合得到支撑。四个晶格1、3、5和6通过NH中心点中心点中心点O通过氢键键合和pi-pi叠层与配位网络相互作用,承载dmf溶剂。讨论了1和2的可逆dmf释放吸收以及氢键对无溶剂结构2和4稳定化的贡献的详细信息。所有新固体均通过红外光谱和热重分析进行了表征,同时对化合物1、5和6进行了磁测量。磁数据表明,Co(II)离子的典型行为源自基态中的明显零场分裂。具有弱反铁磁交换相互作用的作用。

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