Browsing by Author "Promod Kumar Yadav"

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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.
Azobenzamide-based proteomorphous objects as a light/pH-induced photoswitchable module
(Royal Society of Chemistry, 2014) Promod Kumar Yadav; Alok Kumar Singh; Anup Kumar; Niraj Kumari; Antonino Gulino; Lallan Mishra; Tarkeshwar Gupta
Azobenzamide-based molecular scaffolds viz. (E)-4,4′(diazene-1,2- diyl)bis(N-pyridin-3-yl)benzamide (1) and (E)-4,4′(diazene-1,2-diyl)bis(N- pyridin-4-yl)benzamide (2), yield proteomorphous architectures i.e., secondary "β-pleated sheet" and tertiary "β-hairpin" respectively, that offer "optical data storage" competence as a result of reversible light-induced conformational changes in organic solvent. © The Royal Society of Chemistry 2014.