Highly emissive host–guest based on nanoclay intercalated with an Eu3+ complex bearing a new Ru2+ organometallic ligand. (22nd August 2018)

• Record Type: Journal Article
• Authors: Celedón, Salvador; de Camargo, Andrea S. S.; Fuentealba, Mauricio; Artigas, Vania; Benavente, Eglantina; González, Guillermo
• Is Part Of: New journal of chemistry. Volume 42:Number 18(2018)
• Page Start: 15284
• Page End: 15294
• Publication Date: 2018-08-22
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/c8nj02432d
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : An optical nanomaterial of bentonite clay with efficient red pure luminescence from a new europium(iii ) complex based on an organometallic ruthenium(ii ) cationic ligand. Abstract : This work describes the design, synthesis and physicochemical properties of the highly emissive nanocomposite [bentonite][Eu{(η 5 -Cp*)Ru(η 6 -bzac)}3 Phen]0.09 [H2 O]0.22 based on the Eu(iii ) complex [Eu{(η 5 -Cp*)Ru(η 6 -bzac)}3 Phen][PF6 ]3, bearing a new Ru(ii ) organometallic β-diketone ligand [(η 5 -Cp*)Ru(η 6 -Hbzac)][PF6 ], intercalated into bentonite-Na + nanoclay. Single crystal X-ray diffraction analysis of the ligand showed that the [(η 5 -Cp*)Ru] + is bound to the phenyl group of a highly planar and conjugated organic β-diketone 1-phenyl-1, 3-butanedione (Hbzac) through η 6 -coordination. The complex was inserted into bentonite-Na + by ion exchange reactions at room temperature. The products display interlaminar distances and stoichiometries in agreement with the ion exchange capacity and the interlayer space available in the clay. Thermal gravimetric analysis was used to establish the decomposition temperatures of the complex and the nanocomposite, which exceed or border 280 °C. Both compounds exhibit luminescence of high colorimetric purity in the red region. The intensity of the characteristic narrow emission band of Eu 3+ in the red region, corresponding to 5 D0 → 7 F2 transition, is accentuated in the intercalated nanocomposite, reaching a symmetry parameter R = I ( 5 D0 → 7 F2 )/ I ( 5 D0 → 7 F1 ) and Judd–Ofelt Ω 2 parameter approximately three and two times larger respectively than that of the starting complex. The ruthenium(ii )–europium(iii ) based nanocomposite is presented as a potential luminescent material with considerably high stability over time.