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Silver-nitrilotriacetate coordination polymers: Supra-molecular and photoluminescence properties

Singh, S (2019) Silver-nitrilotriacetate coordination polymers: Supra-molecular and photoluminescence properties. In: Inorganica Chimica Acta, 495 .

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Official URL: https://doi.org/10.1016/j.ica.2019.05.038


Three new coordination polymers (CPs), [Ag3(nta)(azpy)3(H2O)]n·5H2O, 1, [Ag3(nta)(bpa)2.5]n·5.5H2O, 2 and [Ag6(nta)2(tmdp)5]n·17H2O, 3 (where nta = nitrilotriacetate, azpy = 4,4′-azobipyridine, bpa = 1,2-di(4-pyridyl)ethane and tmdp = 4,4′-trimethylenedipyridine) have been synthesized and characterized by different techniques viz. elemental analysis, PXRD, IR, UV–vis and X-ray crystallography. Single crystal X-ray studies reveal that CP 1 is one-dimensional structure whereas, 2 and 3 are two-dimensional and three-dimensional structures respectively. By altering the flexibility of bipyridine ligands, different coordination behaviour of nta was observed and also dimensionality of CPs changed from 1D to 3D. A supra-molecular 3D structure of 1 was generated because of π⋯π interactions. The argentophilic interactions involved in the formation of 2D and 3D structures of 2 and 3 respectively. The photoluminescent properties of CPs 1–3 were studied in a solid state at room temperature. CPs 1 and 2 showed emission bands at 432 and 401 nm respectively because of intra-ligand charge transfer transitions. In the case of 1, the emission band is red-shifted with respect to azpy since of π-π stacking in the solid state. CP 3 showed emission in the visible region at 488 nm, is due to the promotion of the lone pair of electrons of the metal to the π* orbital of the ligand.

Item Type: Journal Article
Publication: Inorganica Chimica Acta
Publisher: Elsevier S.A.
Additional Information: The copyright for this article belongs to Elsevier S.A.
Keywords: Charge transfer; Crystal structure; Ligands; Photoluminescence; Polymers; Red Shift; Silver; Silver compounds; Single crystals; X rays, Argentophilic interaction; Bipyridines; Charge transfer transitions; Coordination Polymers; Nitrilotriacetate; Photo-luminescent properties; Photoluminescence properties; Three-dimensional structure, X ray crystallography
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 07 Jan 2023 05:40
Last Modified: 07 Jan 2023 05:40
URI: https://eprints.iisc.ac.in/id/eprint/78854

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