Browsing by Author "Rajamani Nagarajan"

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A light/pH/multiple ion-driven smart switchable module for computing sequential logic operations via a resettable dual-optical readout
(Royal Society of Chemistry, 2015) Alok Kumar Singh; Promod Kumar Yadav; Niraj Kumari; Rajamani Nagarajan; Lallan Mishra
A switchable module comprising pendant pyridine groups, an amide linkage and a photoswitchable functionality (azobenzene) has been designed and characterized via a full battery of physico-chemical techniques. The module has been exploited for ternary/binary data storage with non-destructive optical identity owing to its high photo-stability, excellent reversibility, and chemical-/photo-switchability. Moreover the module exhibits sequential logic gate-based detection of multiple ions (Cu2+, CN-, F- and I-) at ppm levels via a "turn on" signature which potentially meets real-world challenges in terms of the simple synthesis route, rapid response, water based activity, naked-eye visualization, regenerative action, high selectivity and multiple readout for precise analysis. © The Royal Society of Chemistry 2015.
A smart switchable module for the detection of multiple ions: Via turn-on dual-optical readout and their cell imaging studies
(Royal Society of Chemistry, 2016) Abhishek Rai; Alok Kumar Singh; Avinash Kumar Sonkar; Anand Prakash; Jagat Kumar Roy; Rajamani Nagarajan; Lallan Mishra
A module switchable as a function of multi-stimuli response has been designed. The module displays sequential logic gate-based detection of multiple ions (Fe3+, Hg2+, CN- and S2-) at ppm levels via a "turn on" signature which potentially meets real-world-challenges through a simple synthetic route, a fast response, water based-activity, naked-eye visualization, regenerative-action, high selectivity and multiple readout for precise analysis. Living cell imaging of Fe3+ and Hg2+ has also been carried out in HeLa cell lines. © 2016 The Royal Society of Chemistry.
Pyridyl substituted 4-(1,3-Dioxo-1H,3H-benzo[de]isoquinolin-2-ylmethyl)-benzamides with aggregation enhanced emission and multi-stimuli-responsive properties
(Elsevier B.V., 2017) Ashish Kumar Srivastava; Alok Kumar Singh; Niraj Kumari; Richa Yadav; Antonino Gulino; Adolfo Speghini; Rajamani Nagarajan; Lallan Mishra
1,8-Naphthalimide connected to benzoic acid chloride via methylene group was condensed separately with 3-amino pyridine and 4-amino pyridine and provided compounds 4-(1,3-Dioxo-2,3-dihydro-1H-phenalen-2-ylmethyl)-N-pyridin-3-yl-benzamide 1 and 4-(1,3-Dioxo-2,3-dihydro-1H-phenalen-2-ylmethyl)-N-pyridin-4-yl-benzamide 2. The compounds are characterized by spectral (IR, UV–Visible, 1H and 13C NMR) measurements and supported by their X-ray crystallography. Their photoelectron spectroscopy, SEM and TEM measurements are also made. They are found luminescent in DMF solution as well as in the solid state and form nano-aggregates with enhanced emission (AEE) in aqueous-DMF solution. Their AEE behavior depends on the polarity of the solvents. On grinding, crystalline solids 1 and 2 turn to amorphous and the process is reversible on annealing as supported by their powder X-ray diffraction (PXRD) measurements. Both compounds show mechanochromic properties and display multi-stimuli response. Density Functional Theory calculations rationalize their optical data. © 2016 Elsevier B.V.