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Title: | Synthesis of an aggregation-induced emission (AIE) active salicylaldehyde based Schiff base: study of mechanoluminescence and sensitive Zn(ii) sensing |
Authors: | Laskar, Inamur Rahaman |
Keywords: | Chemistry Synthesis Mechanoluminescence Sensitive Zn(ii) sensing |
Issue Date: | 2017 |
Publisher: | RSC |
Abstract: | Syntheses of multi-functional Aggregation-Induced Emission (AIE) active molecules in a simple manner have been drawing great attention in current luminescence materials research. In this report a simple diamine molecule (N1-tritylethane-1,2-diamine(1)) is reacted with salicylaldehyde using a Schiff-base technique which results in a new AIE active organic molecule [2-((2-(tritylamino)ethylideneamino)methyl)phenol (2)]. Computational calculations support that the nature of the transition is intra-molecular charge transfer/twisted intramolecular charge transfer (ICT/TICT). The mechanism of AIE has been attributed to restricted intramolecular rotation (RIR). Packing diagrams support that the nature of the aggregation is J-aggregation. The compound, 2, exhibits an irreversible mechanoluminescence (ML) property with a drastic colour change from blue to green (λmax, 445 nm → 512 nm) upon grinding. However, it undergoes a reversible transition with the same colour change (blue → green) through applying pressure axially (using a hydraulic press). The reversible transition is observed by lowering the temperature of 2 to that of liquid nitrogen. The causes of such transitions showing variations in the emission colour upon different triggers have been investigated. In addition, 2 has been successfully tested for the sensing of Zn(II) and shows a rare turn-on luminescence change, the mechanism behind which has been explored. The detection limit for Zn(II) is determined to be 0.064 ppm. |
URI: | https://pubs.rsc.org/en/content/articlelanding/2017/tc/c7tc03046k http://dspace.bits-pilani.ac.in:8080/xmlui/handle/123456789/3120 |
Appears in Collections: | Department of Chemistry |
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