Abstract
To study the structural effects in three-dimensional porous coordination polymers, three novel flexible porous coordination polymers—[Cd2(bpdc)2](DMF)3(H2O) (1) and [M(bpdc)](DMF)(H2O) (M = Cd (2), Zn (3))—have been synthesized under solvothermal conditions with d10 block metal ions and T-shaped connecting ligand. Complexes 1–3 crystallize in different space groups, but they display the same ant network. The first two complexes can transform into each other via the alteration of guest, whereas complex 3 shows no structural change. The structural details reveal that the size of metal ions might be responsible for the transformation of porous frameworks. Furthermore, luminescent properties have been explored, and a guest-dependent shift of emission peaks was observed, suggesting potential application of the complexes as a probe.
Highlights
Solvothermal method is widely used in the construction of porous coordination polymers (PCPs), and there are many factors that could help to manipulate the structure of the product
While replacing the metal ions and adjusting the standing time before heating, three novel flexible PCPs formed with H2 bpdc ligand and cadmium/zinc ions—[Cd22 ](DMF)3 (H2 O) (1) and [M(bpdc)](DMF)(H2 O) (M = Cd (2), Zn (3))—were produced and characterized
Three novel d10 metal porous coordination polymers have been isolated with TIn summary, three novel d10 metal porous coordination polymers have been isolated with shaped connecting linkers and fully characterized
Summary
The rational design and synthesis of porous coordination polymers (PCPs) and metal–organic frameworks (MOFs) have attracted a great deal of attention for more than two decades thanks to possibility of their structure regulation and potential applications in gas storage and separation [1,2,3,4], catalysis [5,6,7,8], magnetism [9,10], sensing [11,12,13], drug delivery [14,15], and so on [16]. Flexible frameworks were assembled through flexible carboxylate ligands in our previous work [19], and it is of great importance for us to deepen the strategy to the construction with rigid ligands. The multidentate ligand 2,20 -bipyridine-5,50 -dicarboxylic acid (H2 bpdc) is a good candidate because it contains two types of coordination groups—carboxylate groups and chelating position N-donors—which can act in linear bridging mode and/or T-shaped connecting mode [20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37]. To construct 3D flexible PCPs, type a (T-shaped connecting mode) is reported. Is interesting that there are constructed relatively fewer reports on the flexible withconnecting homometallic ions and pure H2bpdc ligand as T-shaped connecting modes, especially in type a. The number of published structureswhich which contain contain HH2bpdc ligands in different coordination
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