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SM ISO690:2012 GOROBEŢ, Anastasia, CRIŞAN, Manuela E., PETRIC, M., BOUROSH, Pavlina, SIMINEL, Anatolii, CROITOR, Lilia. Supramolecular architectures of the luminescent triethanolammonium 4-nitrobenzoate salt and its Ni(II) complexes. In: Achievements and perspectives of modern chemistry, 9-11 octombrie 2019, Chişinău. Chisinau, Republic of Moldova: Tipografia Academiei de Ştiinţe a Moldovei, 2019, p. 111. ISBN 978-9975-62-428-2. |
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Achievements and perspectives of modern chemistry 2019 | |||||
Conferința "International Conference "Achievements and perspectives of modern chemistry"" Chişinău, Moldova, 9-11 octombrie 2019 | |||||
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Pag. 111-111 | |||||
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Multicomponent self-assemblies are a useful and efficient way to create molecular and supramolecular architectures with functions, which would not be realized by typical single molecules. Single crystals of new organic salt HTEA:4-nbz (1) and its Ni(II) complexes [Ni(4nbz)(TEA)(H2O)](4-nbz) (2), [Ni(4-nbz)(TEA)(H2O)](4-nbz)*H2O (3) and [Ni(TEA)2](4-nbz)2 (4) (TEA=triethanolammine and 4-nbz=4-nitrobenzoate) have been successfully grown and characterized by IR spectroscopy and single crystal X-ray analysis.Here we report the supramolecular systems constructed by combining two or three organizing forces: metal-coordination (2-4), hydrogen bonds (1-4) and п-п stacking interactions (1-4). The building blocks in 1 are assembled into 1D chains along b axis through O–H···O and charge-assisted N+–H···O and O–H···O– H-bonding. Resulted chains are further assembled in a supramolecular 2D layer via п-п stacking interactions between adjacent phenyl rings. Complex cations in 2 are assembled into 1D supramolecular chains through O–H···O H-bonds. The outersphere 4-nbz– anion is H-bonded with two complex cations by intermolecular O–H···O H-bond interactions. The intermolecular O–H···O H-bonds unite components in well-defined 2D supramolecular layer, which are stabilized by п-п stacking interactions between adjacent phenyl rings and further assembled in a supramolecular 3D network. In compound 3 intermolecular O– H···O H-bonds relating by the coordinating and uncoordinated water molecules, TEA ligand and outer-sphere 4-nbz– anion form a 2D H-bonding layer stabilized by п-п stacking interactions, which are further assembled via weakп-пstacking interactions between adjacent phenyl rings into a supramolecular 3D network structure. The intermolecular O–H···O H-bonds unite components of 4 in well-defined 2D supramolecular layer, which are further assembled in a supramolecular 3D network via п-п stacking interactions between adjacent phenyl rings of 4-nbz– anions. The luminescence properties of compounds 1-4 were studied in the solid state at room temperature, yex= 337 nm. The fluorescence spectrum of organic salt 1 exhibits five bands at 670, 613, 502, 370 and 360 nm. Compound 2 emits red fluorescence with characteristic emission peaks of compound 1, while 3 emits green fluorescence with characteristic emission peak at 502 nm, as well 439 nm and ultra violet 360 nm. Compound 4 exhibits a weak green fluorescence at 502 nm and ultra violet at 360 nm. |
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