Al3+ triggered aggregation induced emission of an anthracence based azine derivative in SDS medium. (12th May 2020)

• Record Type: Journal Article
• Authors: Khanra, Somnath; Ta, Sabyasachi; Ghosh, Milan; Chatterjee, Sudeshna; Mukherjee, Pallabi; Das, Debasis
• Is Part Of: New journal of chemistry. Volume 44:Number 20(2020)
• Page Start: 8477
• Page End: 8485
• Publication Date: 2020-05-12
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/d0nj00968g
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : Single crystal X-ray structurally characterized anthracene appended unsymmetrical azine derivative, viz. 4-(anthracen-9-ylmethylene-hydrazonomethyl)-2-methoxy-phenol (L5 ) shows Al 3+ assisted aggregation induced emission in SDS medium. Abstract : An anthracene based unsymmetrical azine derivative, viz. 4-(anthracen-9-ylmethylene-hydrazonomethyl)-2-methoxy-phenol (L5 ), is synthesized and structurally characterized by single crystal X-ray diffraction (SC-XRD) analysis. The photo-physical interaction of L5 with Al 3+ in sodium dodecyl sulfate (SDS) is highly selective, allowing recognition of nanomolar (62.8 nM) Al 3+ without interference from common cations. The Job plot shows a 1 : 1 (mole ratio) interaction with an associated binding constant of 9.14 × 10 4 M −1 . The "turn ON" fluorescence is attributed to aggregation induced emission (AIE). The Al 3+ assisted particle size enhancement of L5 from 52.70 nm to 3413.06 nm (3.413 μM) observed through DLS studies corroborates the AIE mechanism. FESEM images also support the proposed mechanism. The cylindrical morphology of L5 changes to a cube shape due to aggregation of the [Al 3+ + L5 ] adduct. Fluorescence lifetime decay (TCSPC) data indicate that the radiative decay of L5 is enhanced about ten times in the presence of Al 3+ . The average lifetime of L5 in the absence and presence of Al 3+ is 0.98 ns and 1.45 respectively. In the presence of Na2 EDTA, the emission intensity of the [L5 + Al 3+ ] system is significantly quenched due to chelation of Al 3+ by EDTA. TDDFT studies indicate higher stability of the [L5 + Al 3+ ] adduct over free L5 .