Abstract
Three silver-based complexes, namely [Ag2(bpa)2](Brtp)·6H2O (1), [Ag3(bpa)3](Hdcdcpb)·9H2O (2), and [Ag2(bpa)2(oa)]·2H2O (3), were synthesized via the reactions of AgNO3, 1,2-bis(4-pyridyl)ethane (bpa), and 2-bromoterephthalic acid (H2Brtp), 2,3-dicarboxyl-(2′,3′-dicarboxylazophenyl)benzene (H4dcdcpb) or 4,4′-oxybisbenzoic acid (H2oa) in aqueous alcohol/ammonia solution at room temperature. Complexes 1 and 2 consist of 1D infinite cationic [Ag(bpa)] n+ n chains, interspersed with non-coordinated and completely deprotonated Brtp2− or partly deprotonated Hdcdcpb3− anions acting as discrete counter-ions to balance the charge. The lattice water molecules are situated among the framework of the crystal structure and show rich hydrogen-bonding interactions, while the presence of Ag…N and Ag…Ag contacts strengthens the frameworks. Complex 3 consists of 2D neutral [Ag2(bpa)2(oa)] in which the completely deprotonated oa2− units both act as bidentate ligands and as counter-ions. All three complexes exhibit luminescent properties, which can be assigned to ligand-to-metal charge transfer and Ag…Ag interactions.
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Acknowledgments
We thank the financial support from National Natural Science Foundation of China, the Beijing Natural Science Foundation and Scientific Research Key Program of Beijing Municipal Commission of Education (KZ201410016018, KM201510016017), the Training Program Foundation for the Beijing Municipal Excellent Talents (2013D005017000004), the Importation and Development of High-Caliber Talents Project of Beijing Municipal Institutions (CIT&CD201404076), the Scientific Research Common Program of Beijing Municipal Commission of Education (KM201510016017), and Open Research Fund Program of Key Laboratory of Urban Stormwater System and Water Environment (Ministry of Education).
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Zhang, J., Wang, CC., Wang, P. et al. Three silver complexes constructed from organic carboxylic acid and 1,2-bis(4-pyridyl)ethane ligands: syntheses, crystal structures, and luminescent properties. Transition Met Chem 40, 821–829 (2015). https://doi.org/10.1007/s11243-015-9978-2
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DOI: https://doi.org/10.1007/s11243-015-9978-2