Thermostability and photophysical properties of mixed-ligand carboxylate/benzimidazole Zn(II)-coordination polymers - Publikacja - MOST Wiedzy

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Thermostability and photophysical properties of mixed-ligand carboxylate/benzimidazole Zn(II)-coordination polymers

Abstrakt

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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Informacje szczegółowe

Kategoria:
Publikacja w czasopiśmie
Typ:
artykuł w czasopiśmie wyróżnionym w JCR
Opublikowano w:
MATERIALS CHEMISTRY AND PHYSICS nr 162, strony 364 - 371,
ISSN: 0254-0584
Język:
angielski
Rok wydania:
2015
Opis bibliograficzny:
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:
Cyfrowy identyfikator dokumentu elektronicznego (otwiera się w nowej karcie) 10.1016/j.matchemphys.2015.05.079
Weryfikacja:
Politechnika Gdańska

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