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  • Title: Synthesis, structure and photoluminescence properties of a three-dimensional cadmium(II) (4,5)-connected coordination network.
    Author: Li NY, Liu D.
    Journal: Acta Crystallogr C Struct Chem; 2018 Dec 01; 74(Pt 12):1581-1585. PubMed ID: 30516140.
    Abstract:
    The assembly of coordination polymers from metal ions and organic moieties is currently attracting considerable attention in crystal engineering due to their intriguing architectures and potential applications as functional materials. A new coordination polymer, namely poly[[μ2-trans-1,2-bis(pyridin-3-yl)ethylene-κ2N:N']bis(μ4-4,4'-oxydibenzoato-κ6O:O,O':O'':O'',O''')dicadmium(II)], [Cd2(C14H8O5)2(C12H10N2)]n or [Cd2(4,4'-OBB)2(3,3'-BPE)]n, has been synthesized by the the self-assembly of Cd(NO3)2·4H2O, 4,4'-oxydibenzoic acid (4,4'-H2OBB) and trans-1,2-bis(pyridin-3-yl)ethene (3,3'-BPE) under hydrothermal conditions. The title compound was structurally characterized by IR spectroscopy, elemental analysis and single-crystal X-ray diffraction analysis. Each CdII centre is coordinated by six carboxylate O atoms from four different 4,4'-OBB2- ligands and by one pyridyl N atom form a 3,3'-BPE ligand. Adjacent crystallographically equivalent CdII ions are bridged by 4,4'-OBB2- ligands, affording a two-dimensional [Cd(4,4'-OBB)]n net extending in the ac plane. Neighbouring [Cd(4,4'-OBB)]n nets are interlinked by 3,3'-BPE along the b axis to form a three-dimensional (3D) [Cd2(4,4'-OBB)2(3,3'-BPE)]n coordination network. In the network, each CdII centre is linked by four different 4,4'-OBB2- ligands and one 3,3'-BPE ligand. Meanwhile, each 4,4'-OBB2- ligand connects four separate CdII ions. Therefore, if the 4,4'-OBB2- ligands and CdII ions are considered as 4- and 5-connecting nodes, the structure of the title compound can be simplified as a 3D (4,5)-connected binodal framework with the rare (4462)(4466) TCS topology (Pearson, 1985; Blake et al., 2011). The thermal stability and photoluminescence properties of the title compound have also been investigated.
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