Abstract
To systematically investigate the influence of the positional isomeric effect on the structures of polymer complexes, we prepared two new polymers containing the two positional isomers ethyl 5-methyl-1-(pyridin-3-yl)-1H-1,2,3-triazole-3-carboxylate (L1) and ethyl-5-methyl-1-(pyridin-3-yl)-1H-1,2,3-triazole-4-carboxylate (L2), as well as Cd(II) ions. The structures of the metal–organic frameworks were determined by a single crystal XRD analysis. The compound [Cd(L1)2·4H2O] (1), is a hydrogen bond-induced coordination polymer, whereas the compound [Cd(L2)4·5H2O]n (2) is a three-dimensional (3-D) coordination polymer. Their structures and properties are tuned by the variable N-donor positions of the ligand isomers. This work indicates that the isomeric effect of the ligand isomers plays an important role in the construction of the Cd(II) complexes. In addition, the thermal and luminescent properties are reported in detail.
Highlights
The self-assembly of coordination polymers and metal–organic frameworks (MOFs) [1,2,3] has been attracting great attention in the past decade, mainly because of their great potential as functional materials for diverse technological applications [4,5,6,7,8]
From a structural point of view, the two principal themes in this field have been the synthesis of compounds that have either discrete molecular architectures with polyhedral or polygonal shapes
The resulting network topology [19] for the supramolecular complex can usually be predicted by selecting the chemical structure of the organic ligands and the usual coordination geometry of the metal ions linking the ligands together in the final structure [20]
Summary
The self-assembly of coordination polymers and metal–organic frameworks (MOFs) [1,2,3] has been attracting great attention in the past decade, mainly because of their great potential as functional materials for diverse technological applications [4,5,6,7,8]. The luminescent properties of this type of material, as well as the possibility of fine-tuning the characteristics of their emission by carefully selecting both the metal and the organic ligands, have been a topic of special relevance in this field [9,10,11,12,13] In this sense, the well-studied luminescent properties [14,15,16,17,18] of d10 cations, such as Cu(I), Ag(I), and Au(I), as well as their versatility in the construction of complex coordination networks with different types of organic ligands have been the object of interest. One crucial aim of this work is to explore the essential factors of positional isomeric ligands for regulating the structural assembly of Cd(II) MOFs, which may provide further insight into the design of new functional crystalline materials [24,25,26,27,28]
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