Molecular Memory Switching Device Based on a Tetranuclear Organotin Sulfide Cage [(RSn^IV)₄(μ-S)₆]·2CHCl₃·4H₂O (R = 2‑(Phenylazo)phenyl): Synthesis, Structure, DFT Studies, and Memristive Behavior

RSnCl3 (R = 2-phenylazophenyl) on reaction with Na2S·9H2O in a 1:1 mixture of acetone and methanol afforded a tetranuclear monoorganotin sulfide cage [(RSnIV)4(μ-S)6]·2CHCl3·4H2O (R = 2-phenylazophenyl) (1). Complex 1 crystallizes in the monoclinic space group P2/n. The molecular structure of 1 contains five-coordinate tin centers in distorted trigonal bipyramidal geometry. Complex 1 is monoorganotin sulfide derivative having a tetranuclear double-decker cage-like structure. In 1, four tin centers are bridged by a μ2-S unit affording a ubiquitous Sn–S–Sn motif among monoorganotin sulfide compounds. In addition, each tin also has intramolecular coordination to a nitrogen atom of a 2-phenylazophenyl substituent (N → Sn). The DFT calculation suggests that the complex 1 involves mainly ligand based transitions. The complex 1 based device was studied for its electrical behavior and was found to show stable, reproducible memristive behavior with an on–off ratio of 103, which suggests that the complex 1 is a promising material for memory device applications

Novel extraction technique: quantification of major phytoconstituents of arjuna in infused edible oil

A rapid, precise, accurate, and cost-effective liquid chromatography-mass spectrometer method was developed by using a novel extraction technique for the simultaneous quantification of major oleane derivatives: arjunetin, arjungenin, arjunolic acid, and arjunic acid of Terminalia arjuna in infused edible oil. An innovative idea was implemented to extract the active phytoconstituents from the oil matrix based on the freezing point of oils and extraction solvent. The developed method was validated for all four active compounds in the linear working range of 0.47–1.72 µg/mL, 0.845–2.93 µg/mL, 1.73–5.95 µg/mL and 0.62–2.22  µg/mL with good correlations value (r2) more than 0.99 for arjunetin, arjungenin, arjunolic acid, and arjunetin, respectively. Furthermore, the HPTLC method was also developed for the quick identification of all four active markers along with other phytoconstituents infused in oil.</p