Ligand-Isomerism Controlled Structural Diversity of Zn(II) and Cd(II) Coordination Polymers from Mixed Dipyridyladipoamide and Benzenedicarboxylate Ligands

Abstract

By using isomeric N,N′-di(2-pyridyl)adipoamide (L 1 ), N,N′-di(3-pyridyl)adipoamide (L 2 ) and N,N′-di(4-pyridyl)adipoamide (L 3 ) and isomeric 1,2-benzenedicarboxylic acid (1,2-H 2 BDC), 1,3-benzenedicarboxylic acid (1,3-H 2 BDC) and 1,4-benzenedicarboxylic acid (1,4-H 2 BDC), eight Zn(II) and Cd(II, have been synthesized under hydrothermal conditions. Complexes 1, 4, and 5 form 1D double-looped chain, 1D chain with loops and 2D layer with loops, respectively, and complex 6 exhibits a 1D ladder chain. Complex 2 shows rare 3-fold interpenetrated hcb layers, in which each layer interdigitates with other four parallel layers by directing the 1,3-BDC ligands into the windows of the adjacent nets, whereas complexes 3 and 8 forms planar and undulated hcb layers, respectively. Complex 7 shows a 3D selfpenetrating net of {4 24 .5.6 3 }-ilc topology with a unique arrangement for the L 2 spacer ligands. The L 1 ligands in complexes 3 and 8 adopt the new tetradentate bonding mode involving chelation and bridge through two pyridyl nitrogen atoms and two amide oxygen atoms, whereas the L 2 and L 3 ligands in other complexes show the bidentate bonding mode through the two pyridyl nitrogen atoms. The various bonding modes and the ligand-isomerism of the spacer ligands BDC 2− and L 1 −L 3 as well as the identity of the metal center play important roles in determining the structural diversity.

Effect of three aromatic polycarboxylates on the structural diversities and properties of three new cadmium(II) coordination compounds

“…Based on the flexible bis(pyridyl)-bis(amide) ligands with different -(CH 2 ) n -spacers (n = 0, 1, 2, • • • 10) and different aromatic polycarboxylates as the mixed ligands, some MOCCs with diversified topological structures and interesting properties have been obtained. [17][18][19][20][21][22][23][24][25] For example, Chen's group and Cao's group have prepared three Zn(II)/Cd(II) compounds derived from the mixedligand systems of the flexible bis(pyridyl)-bis(amide) ligands with various -(CH 2 ) n -spacers (n = 0, 4, 10) and dicarboxylates. [17][18][19] Utilizing the mixed ligands of the flexible bis(pyridyl)-bis(amide) ligands with different -(CH 2 ) n -spacers (n = 0, 1, 2, 4, 5, 6, 8) and different dicarboxylates or tricarboxylates, our group has obtained a series of Cu(II)/Co(II) coordination compounds, and all of them exhibit significant photocatalytic activities to degrade some organic dyes.…”

“…[17][18][19][20][21][22][23][24][25] For example, Chen's group and Cao's group have prepared three Zn(II)/Cd(II) compounds derived from the mixedligand systems of the flexible bis(pyridyl)-bis(amide) ligands with various -(CH 2 ) n -spacers (n = 0, 4, 10) and dicarboxylates. [17][18][19] Utilizing the mixed ligands of the flexible bis(pyridyl)-bis(amide) ligands with different -(CH 2 ) n -spacers (n = 0, 1, 2, 4, 5, 6, 8) and different dicarboxylates or tricarboxylates, our group has obtained a series of Cu(II)/Co(II) coordination compounds, and all of them exhibit significant photocatalytic activities to degrade some organic dyes. 20,21 By using the flexible bis(pyridyl)-bis(amide) ligands with -(CH 2 ) 2 -, our group has synthesized a 2D layered Cd(II) compound [Cd (3-bpsa) , which shows fluorescent properties and can photocatalytically degrade the dye methylene blue (MB) under UV irradiation.…”

Structure and Photocatalytic Property of a Cobalt(II) Compound Containing Pentanuclear [Co5(mtpo)2(μ3-OH)2(μ2-OH)2(COO)3] Clusters as Building Subunits

“…The design and synthesis of coordination polymers (Cps) has received more and more attention not only owing to their intriguing architectures and fascinating topologies but also owing to their multiple applications in the fields of catalysis, chemical sensor, gas storage and so on . During the past few decades, many effective strategies for the construction of CPs have been well established, such as mixed‐ligand method, second building‐block approach, pillar‐layer method, postsynthetic modification, and so on, which can help us obtain the CPs with desired structures and physical and chemical properties .…”

Various pH-Dependent Copper(II) Coordination Architectures Constructed from N,N′-Di(3-pyridyl)succinamide and Two Different Dicarboxylates

“…[13] As is known, the bis-pyridyl-bis-amide ligands not only possess various coordination sites and strong coordination ability, but also contain abundant hydrogen-bond donors and acceptors, which have attracted great interest in the construction of MOCPs. [14,15] For example, Chen's and Luo's groups have reported a series of transition metal (Zn, Cd, Hg) complexes based on the flexible bis(pyridylamide) ligands. [16,17] Our group has also reported a series of bis-pyridyl-bis-amide-based MOCPs and investigated their properties.…”