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Institution

Indian Association for the Cultivation of Science

EducationKolkata, India
About: Indian Association for the Cultivation of Science is a education organization based out in Kolkata, India. It is known for research contribution in the topics: Excited state & Catalysis. The organization has 3867 authors who have published 10457 publications receiving 220098 citations.
Topics: Excited state, Catalysis, Ligand, Thin film, Band gap


Papers
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Journal ArticleDOI
TL;DR: A structurally characterized new oxo-chromene functionalized rhodamine derivative L1 exhibits high selectivity toward Sn(4+) by forming a 1:1 complex, among other biologically important metal ions, as studied by fluorescence, absorption, and HRMS spectroscopy.
Abstract: A structurally characterized new oxo-chromene functionalized rhodamine derivative L1 exhibits high selectivity toward Sn(4+) by forming a 1:1 complex, among other biologically important metal ions, as studied by fluorescence, absorption, and HRMS spectroscopy. Complexing with Sn(4+) triggers the formation of a highly fluorescent ring-open form which is pink in color. The sensor shows extremely high fluorescence enhancement upon complexation with Sn(4+), and it can be used as a "naked-eye" sensor. DFT computational studies carried out in mimicking the formation of a 1:1 complex between L1 and Sn(4+) resulted in a nearly planar pentacoordinate Sn(IV) complex. Studies reveal that the in situ prepared L1-Sn complex is selectively and fully reversible in presence of sulfide anions. Further, confocal microscopic studies confirmed that the receptor shows in vitro detection of Sn(4+) ions in RAW cells.

67 citations

Journal ArticleDOI
TL;DR: In this article, the authors show that even under the best conditions (using both CuX2 and X- ion additives), the PDI is high, ca. 1.6−1.7.
Abstract: Atom transfer radical polymerization (ATRP) of acrylamide has been carried out in water or in glycerol−water (1:1 v/v) medium at 130 °C using water-soluble initiators, viz. 2-chloropropionamide (2-Cl-PA) or 2-bromopropionamide (2-Br-PA) and CuX (X = Cl, Br) bipyridine complex as catalyst. Extraneous addition of CuX2 (20 mol % of CuX) and/or excess X- ions (1 M alkali halide) in the reaction mixture helps to reduce molecular weight polydispersity (PDI). However, even under the best conditions (using both CuX2 and X- ion additives), the PDI is high, ca. 1.6−1.7. Also, the GPC traces show shoulders. The chain extension experiment, however, confirms the living nature of the polymers. Replacement of glycerol−water with water as the medium results in sluggish polymerization. The ln M0/M vs t plots are curved to start with but become linear after polymerization proceeds to variable extents depending on the additives used. The molecular weights tend to agree with the theoretical values as conversion increases. A ...

67 citations

Journal ArticleDOI
TL;DR: The structural analysis reveals that bridging glutarate gives rise to dinuclear and tetranuclear species, whereas the adipate dianion leads to octanuclear, one-dimensional and two-dimensional polymeric complexes, although they have been prepared under similar conditions.
Abstract: Eight new metal-organic hybrid materials of Cu(ll) have been synthesized by using flexible glutarate/adipate as a bridging ligand, 2,2'-bipyridine/1,10-phenanthroline as a chelating ligand, and BF 4 -/Cl0 4 -/Cl- as a counteranion. These materials are characterized by single-crystal X-ray diffraction analyses and variable temperature magnetic measurements. Out of them, complexes 1, 3, 5, and 8 crystallize in the triclinic system with space group P1. Complexes 2, 4, 6, and 7 crystallize in the monoclinic system with space group P2 1 /n (2, 4), F2 1 /c (6), and C2 (7). The structural analysis reveals that bridging glutarate gives rise to dinuclear and tetranuclear species, whereas the adipate dianion leads to octanuclear, one-dimensional and two-dimensional polymeric complexes, although they have been prepared under similar conditions. Supramolecular architectures of higher dimensionality have been achieved through H-bonding and π-π interaction. In all the complexes, the bridging and/or counteranions as well as chelating ligand have a vital role in directing the solid-state structure. A variable temperature (2-300 K) magnetic susceptibility study discloses the antiferromagnetic coupling for all of the complexes.

67 citations

Journal ArticleDOI
TL;DR: DFT calculations provide a detailed insight into how the, apparently weak, 2nd sphere interactions lead to efficient CO2 activation for reduction and suggest that H-bonding alone can tune the rate of CO2 reduction by as much as 1000 fold.
Abstract: Iron porphyrins are potential catalysts for the electrocatalytic and photocatalytic reduction of CO2. It has been recently established that the reduction of CO2 by an iron porphyrin complex with a hydrogen bonding distal pocket involves at least two intermediates: a Fe(II)–CO22− and a Fe(II)–COOH species. A distal hydrogen bonding interaction was found to be key in determining the stability of these intermediates and affecting both the selectivity and rate of CO2 reduction. In this report, a series of iron porphyrins that vary only in the distal H-bonding network are further investigated and these exhibit turnover frequencies (TOFs) ranging from 1.0 s−1 to 103 s−1. The experimental TOFs correlate with the H-bonding ability of the distal superstructure of these iron porphyrin complexes and analysis suggests that H-bonding alone can tune the rate of CO2 reduction by as much as 1000 fold. DFT calculations provide a detailed insight into how the, apparently weak, 2nd sphere interactions lead to efficient CO2 activation for reduction. The ability to tune CO2 reduction rates by changing the H-bonding residue instead of the acid source is a convenient way to tune CO2 reduction electrocatalysis without compromising selectivity by introducing competitive hydrogen evolution reaction or formate generation.

67 citations

Journal ArticleDOI
TL;DR: The magnetic susceptibility and magnetization data confirm a paramagnetic behavior, and no remnant magnetization exists in any of these compounds at vanishing magnetic field.
Abstract: A new family of 3d–4f heterometal 2 × 2 complexes [CoII2(L)2(PhCOO)2LnIII2(hfac)4] (1–5) (Ln = Gd (compound 1), Tb (compound 2), Dy (compound 3), Ho (compound 4), and La (compound 5)) have been synthesized in moderate yields (48–63%) following a single-pot protocol using stoichiometric amounts (1:1 mol ratio) of [CoII(H2L)(PhCOO)2] (H2L = N,N′-dimethyl-N,N′-bis(2-hydroxy-3,5-dimethylbenzyl)ethylenediamine) as a metalloligand and [LnIII(hfac)3(H2O)2] (Hhfac = hexafluoroacetylacetone) as a lanthanide precursor compound. Also reported with this series is the Zn–Dy analog [ZnII2(L)2(PhCOO)2DyIII2(hfac)4] 6 to help us in understanding the magnetic properties of these compounds. The compounds 1–6 are isostructural. Both hexafluoroacetylacetonate and benzoate play crucial roles in these structures as coligands in generating a tetranuclear core of high thermodynamic stability through a self-assembly process. The metal centers are arranged alternately at the four corners of this rhombic core, and the carboxylato o...

66 citations


Authors

Showing all 3900 results

NameH-indexPapersCitations
Yves Pommier12378958898
Flemming Besenbacher11472851827
Katsuhiko Ariga11286445242
Shunichi Fukuzumi111125652764
Rajdeep Mohan Chatterjee11099051407
Kwang S. Kim9764262053
Amar K. Mohanty8153831856
Nigel D. Browning8164623621
Andrea Caneschi8043525896
Rodolphe Clérac7850622604
Subrata Ghosh7884132147
Miaofang Chi7730422817
Yuan Ping Feng7765025846
D. D. Sarma7052118082
Asim Bhaumik6946616882
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
202310
202283
2021443
2020447
2019452
2018467