Photoluminescence Properties of Zn(II) and Cd(II) Coordination Polymers with Dicarboxylic Acids and Nicotinamide Pillars
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CHIŞCA, Diana, CROITOR, Lilia, KULIKOVA, Olga, KOROPCHANU, E., FONARI, Marina. Photoluminescence Properties of Zn(II) and Cd(II) Coordination Polymers with Dicarboxylic Acids and Nicotinamide Pillars. In: Multidisciplinarity in Modern Science for the Benefit of Society, 21-22 septembrie 2017, Chișinău. Chișinău, Republica Moldova: Inst. de Fizică Aplicată, 2017, pp. 53-54. ISBN 978-9975-9787-1-2.
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Multidisciplinarity in Modern Science for the Benefit of Society 2017
Masa rotundă "Multidisciplinarity in Modern Science for the Benefit of Society"
Chișinău, Moldova, 21-22 septembrie 2017

Photoluminescence Properties of Zn(II) and Cd(II) Coordination Polymers with Dicarboxylic Acids and Nicotinamide Pillars


Pag. 53-54

Chişca Diana12, Croitor Lilia1, Kulikova Olga1, Koropchanu E.23, Fonari Marina1
 
1 Institute of Applied Physics, Academy of Sciences of Moldova,
2 Tiraspol State University,
3 Institute of Chemistry of the Academy of Sciences of Moldova
 
Disponibil în IBN: 16 martie 2018



Teza

In the past few years, great interest has been attracted by the design and synthesis of metalorganic frameworks not only because of their intriguing topological diversity but also because of their potential applications as functional materials in the fields of luminescence, catalysis, magnetism, nonlinear optics, gas storage, and so on [1]. Meanwhile, many polynuclear Cd(II) and Zn(II) compounds have exhibited promising luminescent properties, especially with the ligands containing hetero-aromatic rings, that can effectively enhance the fluorescence emissions of coordination polymers (CPs) and are currently of interest in the development of fluorescent materials [2]. Our research includes excitation and emission experiments and study of luminescent properties for a new series of Cd(II) and Zn(II) CPs in comparison with the used ligands. Six single- and double-pillared 1D and 2D CPs with the compositions [Cd(bdc)(H2O)2(dmf)2]n (1), [Cd2(suc)(sucH)2(nia)4]n (2), {[Cd(adi)(iso-nia)2].(dmf)}n, (3), {[Zn(mal)(nia)(H2O)].dmf}n (4), Zn(mal)(iso-nia)(H2O)]·dmf}n (5), {[Zn(mal)(S-nia)(H2O)].dmf}n (6) (where malonic acid=H2mal, succinic acid=H2suc, adipic acid=H2adi, and 1,4-benzenedicarboxylic acid=H2bdc, isonicotinamide=iso-nia, nicotinamide=nia, and thionicotinamide=S-nia), were obtained by solvent co-crystallization. Excitation of the microcrystalline samples at λexc =337 nm leads to the generation of similar fluorescent emissions in the visible part of the spectrum. The photoluminescence of the free ligands, except that for iso-nia, is several orders of magnitude lower than observed in the complexes and does not affect the shape of the spectra. The half-width of the maximum of the photoluminescence spectrum of the complexes that include iso-nia is broadened by raising both the short-wave length wing and the long-wave length wing. The solid-state emission of Cd(II) compounds 1-3 is more than an order of magnitude higher than the luminescence of Zn(II) compounds 4-6. For Cd(II) complexes, bright red photoluminescence is observed in the 550-620 nm and for Zn(II) complexes in 420-620 nm regions. Presumably, the emissions of complexes should originate from the intra-ligand π */ π transition. The significant red shift of the emission maximum in contrast to that of free ligand should be attributed to the metal–ligand coordination interactions.