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1. A Supramolecular View on the Cooperative Role of Brønsted and Lewis Acid Sites in Zeolites for Methanol Conversion

Author:
Chowdhury, Abhishek Dutta,   et al.   ; Bailleul, Simon; Yarulina, Irina; Hoffman, Alexander E. J.; Dokania, Abhay; Abou-Hamad, Edy; Pieters, Giovanni; Hajek, Julianna; De Wispelaere, Kristof; Waroquier, Michel; Gascon, Jorge; Van Speybroeck, Veronique;     Show all 12 Authors
Source:
Journal of the American Chemical Society 2019 v.141 no.37 pp. 14823-14842
ISSN:
1520-5126
Subject:
Bronsted acids; Lewis acids; acidity; aluminum; barium; benzene; calcium; catalysts; catalytic activity; magnesium; methanol; methylation; propylene; pyridines; spectral analysis; strontium; zeolites
Abstract:
... A systematic molecular level and spectroscopic investigation is presented to show the cooperative role of Brønsted acid and Lewis acid sites in zeolites for the conversion of methanol. Extra-framework alkaline-earth metal containing species and aluminum species decrease the number of Brønsted acid sites, as protonated metal clusters are formed. A combined experimental and theoretical effort shows ...
DOI:
10.1021/jacs.9b07484

2. Reversible and Site-Dependent Proton-Transfer in Zeolites Uncovered at the Single-Molecule Level

Author:
Chowdhury, Abhishek Dutta,   et al.   ; Ristanović, Zoran; Brogaard, Rasmus Y.; Houben, Klaartje; Baldus, Marc; Hofkens, Johan; Roeffaers, Maarten B. J.; Weckhuysen, Bert M.;     Show all 8 Authors
Source:
Journal of the American Chemical Society 2018 v.140 no.43 pp. 14195-14205
ISSN:
1520-5126
Subject:
Bronsted acids; dimerization; fluorescence; fluorescence microscopy; moieties; nuclear magnetic resonance spectroscopy; photostability; solvents; styrene; thermodynamics; zeolites
Abstract:
... Zeolite activity and selectivity is often determined by the underlying proton and hydrogen-transfer reaction pathways. For the first time, we use single-molecule fluorescence microscopy to directly follow the real-time behavior of individual styrene-derived carbocationic species formed within zeolite ZSM-5. We find that intermittent fluorescence and remarkable photostability of carbocationic inter ...
DOI:
10.1021/jacs.8b08041

3. Isolating Clusters of Light Elements in Molecular Sieves with Atom Probe Tomography

Author:
Chowdhury, Abhishek Dutta,   et al.   ; Schmidt, Joel E.; Peng, Linqing; Paioni, Alessandra Lucini; Ehren, Helena Leona; Guo, Wei; Mazumder, Baishakhi; Matthijs de Winter, D. A.; Attila, Özgün; Fu, Donglong; Houben, Klaartje; Baldus, Marc; Poplawsky, Jonathan D.; Weckhuysen, Bert M.;     Show all 14 Authors
Source:
Journal of the American Chemical Society 2018 v.140 no.29 pp. 9154-9158
ISSN:
1520-5126
Subject:
Bronsted acids; active sites; aluminum; carbon; catalysts; electron microscopy; nuclear magnetic resonance spectroscopy; oxygen; phosphorus; porous media; silicon; stable isotopes; structure-activity relationships; tomography
Abstract:
... Understanding the 3-D distribution and nature of active sites in heterogeneous catalysts is critical to developing structure–function relationships. However, this is difficult to achieve in microporous materials as there is little relative z-contrast between active and inactive framework elements (e.g., Al, O, P, and Si), making them difficult to differentiate with electron microscopies. We have a ...
DOI:
10.1021/jacs.8b04494
PubMed:
30003782
PubMed Central:
PMC6065070

4. Synthesis, crystal structure, DNA interaction and in vitro anticancer activity of a Cu(ii) complex of purpurin: dual poison for human DNA topoisomerase I and II

Author:
Chowdhury, Abhishek Dutta,   et al.   ; Das, Piyal; Jain, Chetan Kumar; Dey, Sanjoy K.; Saha, Rajat; Roychoudhury, Susanta; Kumar, Sanjay; Majumder, Hemanta Kumar; Das, Saurabh;     Show all 9 Authors
Source:
RSC advances 2014 v.4 no.103 pp. 59344-59357
ISSN:
2046-2069
Subject:
DNA; DNA topoisomerase; DNA topoisomerase (ATP-hydrolysing); NAD (coenzyme); NADH dehydrogenase; antineoplastic activity; cell growth; copper; crystal structure; doxorubicin; growth retardation; humans; models; neoplasm cells; neoplasms; pH; quinones; reactive oxygen species; spectral analysis
Abstract:
... Although generation of reactive oxygen species (ROS) by anthracycline anticancer drugs is essential for anti-tumor activity, they make these drugs cardiotoxic. Metal–anthracyclines that generate relatively fewer ROS are however, effective antitumor agents. Purpurin (LH₃), a hydroxy-9,10-anthraquinone, closely resembles doxorubicin, an established anthracycline drug. This molecule was chosen to stu ...
DOI:
10.1039/c4ra07127a

5. Is a naked platinum nanocatalyst better than the analogous supported catalysts?

Author:
Chowdhury, Abhishek Dutta,   et al.   ; Bhaduri, Sumit; Lahiri, Goutam Kumar;     Show all 3 Authors
Source:
RSC advances 2013 v.3 no.16 pp. 5341-5344
ISSN:
2046-2069
Subject:
catalysts; nanomaterials; platinum; polymers; water solubility
Abstract:
... The performance of naked nanocatalyst 1, derived from Chini cluster ([Pt₁₅(CO)₃₀]²⁻), has been evaluated with special reference to the analogous catalysts 2 and 3 which were derived from the same [Pt₁₅(CO)₃₀]²⁻ but supported by MCM-41 and the water soluble polymer PDADMAC, respectively. ...
DOI:
10.1039/c3ra23392h

6. Influence of nitrosyl coordination on the binding mode of quinaldate in selective ruthenium frameworks. Electronic structure and reactivity aspects

Author:
Chowdhury, Abhishek Dutta,   et al.   ; De, Prinaka; Mobin, Shaikh M.; Lahiri, Goutam Kumar;     Show all 4 Authors
Source:
RSC advances 2012 v.2 no.8 pp. 3437-3446
ISSN:
2046-2069
Subject:
X-radiation; electron paramagnetic resonance spectroscopy; geometry; nitric oxide; nitrogen dioxide; oxygen; pH; ruthenium; solvents
Abstract:
... The nitrosyl complexes, [Ruᴵᴵ(trpy)(L)(NO⁺)Cl]BF₄, [1]BF₄, and [Ruᴵᴵ(trpy)(L)(NO⁺)](BF₄)₂, [2](BF₄)₂, (trpy = 2,2′:6′,2′′-terpyridine, L⁻ = deprotonated form of unsymmetrical quinaldic acid) have been synthesized. Single crystal X-ray structures of [1]BF₄ and [2](BF₄)₂ reveal that in the former L⁻ binds to the ruthenium ion selectively in a monodentate fashion through the O⁻ donor whereas the usua ...
DOI:
10.1039/c2ra00953f