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Thermostability and photophysical properties of mixed-ligand carboxylate/benzimidazole Zn(II)-coordination polymers
Abstract
The reaction between Zn(NO3)2*6H2O or Zn(CH3COO)2*2H2O and isophthalic acid (1,3-H2bdc) in the presence of benzimidazole (Hbzim) in dimethylformamide (DMF)/ethanol (EtOH)/H2O solvent mixture at room temperature yielded two structurally different coordination polymers: [Zn2(1,3-bdc)2(Hbzim)2] (1) and [Zn2(1,3-bdc)(bzim)2] (2). (1) is a 2D-layered framework with a molecule of benzimidazole coordinated to the Zn center, whereas (2) is a 3D framework with benzimidazolate species acting as a coligand and bridging two Zn(II) ions. Reactions performed at 90 C led to the formation of coordination polymers structurally similar to (2), independently of the Zn(II) source used. In the absence of benzimidazole, the reaction between ZnAc2.2H2O and 1,3-H2bdc at 90 C resulted in the formation of (3), a 3D coordination polymer Zn(HCOO)3(Me2NH2 þ). It was observed that the thermostability and the photophysical properties of (1) and (2) are strongly dependent on the coordination modes and packing of benzimidazole in the solid state. These materials present photoluminescence in the wide range of the spectrum, from UV to IR. A full understanding of a physical process occurring in these intriguing systems, including complete energy level diagrams with possible transitions were provided.
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Authors (6)
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Bráulio Barros
- Federal University of Rio Grande do Norte (UFRN), Natal, Brazylia School of Science and Technology,
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Antonia Macêdo
- Federal University of Pernambuco (UFPE), Recife, Brazylia Department of Fundamental Chemistry
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Joanna Kulesza dr inż.
- Federal University of Pernambuco (UFPE), Recife, Brazylia Department of Fundamental Chemistry
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Leonis Lourenço
- Federal University of Pernambuco (UFPE), Recife, Brazylia Department of Fundamental Chemistry
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Severino Alves Junior
- Federal University of Pernambuco (UFPE), Recife, Brazylia Department of Fundamental Chemistry
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Keywords
Details
- Category:
- Articles
- Type:
- artykuł w czasopiśmie wyróżnionym w JCR
- Published in:
-
MATERIALS CHEMISTRY AND PHYSICS
no. 162,
pages 364 - 371,
ISSN: 0254-0584 - Language:
- English
- Publication year:
- 2015
- Bibliographic description:
- Barros B., Chojnacki J., Macêdo A., Kulesza J., Lourenço L., Junior S.: Thermostability and photophysical properties of mixed-ligand carboxylate/benzimidazole Zn(II)-coordination polymers// MATERIALS CHEMISTRY AND PHYSICS. -Vol. 162, (2015), s.364-371
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.matchemphys.2015.05.079
- Verified by:
- Gdańsk University of Technology
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