Abstract
Four new different porous crystalline Cd(II)-based coordination polymers (CPs), i. e., [Cd(mdpt)2]·2H2O (1), [Cd2(mdpt)2(m-bdc)(H2O)2] (2), [Cd(Hmdpt)(p-bdc)]·2H2O (3), and [Cd3(mdpt)2(bpdc)2]·2.5NMP (4), were obtained successfully by the assembly of Cd(II) ions and bitopic 3-(3-methyl-2-pyridyl)-5-(4-pyridyl)-1,2,4-triazole (Hmdpt) in the presence of various benzendicarboxylate ligands, i.e., 1,3/1,4-benzenedicarboxylic acid (m-H2bdc, p-H2bdc) and biphenyl-4,4′-bicarboxylate (H2bpdc). Herein, complex 1 is a porous 2-fold interpenetrated four-connected 3D NbO topological framework based on the mdpt− ligand; 2 reveals a two-dimensional (2D) hcb network. Interestingly, 3 presents a three-dimensional (3D) rare interpenetrated double-insertion supramolecular net via 2D ···ABAB··· layers and can be viewed as an fsh topological net, while complex 4 displays a 3D sqc117 framework. Then, the different gas sorption performances were carried out carefully for complexes 1 and 4, the results of which showed 4 has preferable sorption than that of 1 and can be the potential CO2 storage and separation material. Furthermore, the stability and luminescence of four complexes were performed carefully in the solid state.
Highlights
The current research findings have presented that Ncontaining heterocyclic ligands possess excellent binding abilities with different center metal ions to construct various coordination polymers (CPs)
There are some studies mainly focused on the Nheterocycles and their derivatives with five-membered rings and multicarboxylate as mixed ligands to build different porous CPs (Pachfule and Banerjee, 2011; Chen et al, 2013; Liu et al, 2014; Qin et al, 2014; Wang et al, 2014; Du et al, 2015; Li et al, 2016, 2017; Yan et al, 2017), which often show exceptional gas sorption and luminescent performances
The deprotonated carboxylates exhibit η2μ2χ3 and η2μ2χ2 (Supplementary Figure 5) coordination modes and the N2, N3 of the mdpt− ligands are coordinated with three Cd(II) ions to result in a new [Cd3(μ2-COO)4N4] secondary building unit (SBU) (Figure 5B)
Summary
The coordination polymers (CPs) have gained considerable research interest by the self-assembly of various organic linkers (including different functional groups) with metal ions/clusters due to their special topological nets and broad applications (Wang et al, 2014, 2015; Smith et al, 2015; Wang and Wang, 2015; Dey et al, 2017; Hong et al, 2017; Islamoglu et al, 2017; Kariem et al, 2017; Lin et al, 2017; Li et al, 2018; Xing and Janiak, 2020; Zhang et al, 2020). Complex 3 presents a three-dimensional (3D) rare interlocked double-insertion fsh supramolecular net via 2D ···ABAB··· layers, while 4 is a 3D sqc117 network. Their structural diversity indicates that the different secondary benzendicarboxylate linkers have great influence on the assembly process of new CPs. The stability and luminescence were investigated carefully for four complexes in the solid state. The Cambridge Crystallographic Data Centre (CCDC) numbers of the four CPs are 1543594– 1543597, respectively
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