Publications by authors named "Monalisa Gangopadhyay"

Self-assembly of suitable molecular building blocks is an efficient and convenient approach to generate nanomaterials with various morphologies and functions. Moreover, understanding the nature of molecules and controlling factors of their self-assembly process is crucial in fundamental aspects of molecular self-assembly which provide insights into the design of new assemblies with functional nano-architectures. To this end, the present study reports water induced self-assembled multifaceted morphology formation and the plausible pathway of the morphology transformation of a single poly(aryl ether) dendron amphiphile 1(D).

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The appropriate choice of the host molecules with well-defined optical activity (S-H/R-H) helps in the differentiation between two secondary ammonium ion-derivative guest molecules with different optical activities (R-G/S-G) based on the fluorescence resonance energy transfer (FRET)-based luminescence responses. Crown ether-based host molecules with opposite chiral configurations (R-H, S-H) have been derived from 1,1'-bi-2-naphthol (BINOL) derivatives that have axially chiral biaryl centers. These chiral crown ethers form host-guest complexes (i.

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A unique fluorescence resonance energy transfer (FRET) process is found to be operational in a unilamellar lipid self-assembly in the aqueous phase. A newly synthesized naphthyl based long chain lipid derivative [N-(naphthalene-1-ylmethyl)tetradecane-1-ammonium chloride, 14NA] forms various self-assembled architectures in the aqueous phase. Controlled changes in lipid concentration lead to a transition of the self-assemblies from micelles to vesicles to rods.

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Binary pseudorotaxane formation between an aza crown derivative as host (H) and two different imidazolium derivatives as guests (G and G) have been studied in detail by NMR (H NMR, 2D NOESY), optical (steady state electronic and emission spectroscopy), and mass spectroscopy. Binding stoichiometry (1:1), association constant for the respective [2]pseudorotaxane formation (K = (2.61 ± 0.

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The helical handedness in achiral self-assemblies is mostly complex due to spontaneous symmetry breaking or kinetically controlled random assembly formation. Here an attempt has been made to address this issue through chiral anion exchange. A new class of cationic achiral C3-symmetric gelator devoid of any conventional gelation assisting functional units is found to form both right- and left-handed helical structures.

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A chemodosimteric reagent (1) for the efficient detection of cyanide species (CN and/or HCN) in aq. medium as well as under physiological conditions has been described. Selective reaction of the cyanide species with this reagent in the presence of all common interfering anions, amino acids and glutathione (GSH) led to the generation of the corresponding cyanohydrin derivative.

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A newly synthesized triphenylamine derivative (1Cl3) shows significant differences in inclusion complex formation with two different macrocyclic hosts, cucurbit[7]uril (CB[7]) and β-cyclodextrin (β-CD). Detailed investigations by NMR spectroscopy reveal that CB[7] forms a 1:3 host-guest complex ([1·3{CB[7]}]Cl3) in which three arms of 1Cl3 are bound to three host molecules. On the other hand, β-CD forms a dynamic 1:1 inclusion complex ([1·{β-CD}]Cl3) by binding to only one of the three arms of 1Cl3 at a given time.

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Article Synopsis
  • Chemists have effectively harnessed predictable non-covalent interactions to create complex functional structures, which are important in supramolecular chemistry.
  • The review outlines strategies for designing host and guest components, enhancing their optical responses through fluorophore tagging upon assembly formation.
  • These innovations contribute to the development of smart materials that react to stimuli, offering potential applications in self-healing technologies and improved understanding in biophysical chemistry.
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Article Synopsis
  • The study focuses on a novel [2]pseudorotaxane complex formed using a NO6-based azacrown ether as the host and various guest molecules, demonstrating unique fluorescence and electron transfer properties.
  • Different guest molecules (G1, G2, G3, G4) were tested, showing that only G4, with a bulkier stopper, fails to form the complex; the size of the stopper affects the complex's stability and association constant.
  • Thermodynamic analysis reveals the formation of the complexes is primarily driven by a positive entropic gain, and differences in proton exchange between the acidic NH2(+) of guests impact the efficiency of the observed photoinduced electron transfer-cou
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