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Maity J, Bhattacharjee G, Satpati B, Sardar D, Ghosalya MK, Bala T. Dexterous Route for Synthesis of Hollow Spherical ZnO and ZnO‐Ag Nanocomposite with Superior Photocatalytic Ability. ChemistrySelect 2019. [DOI: 10.1002/slct.201900760] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Jayeta Maity
- Department of ChemistryUniversity of Calcutta 92, A. P. C. Road Kolkata- 700009 India
| | - Gourab Bhattacharjee
- Surface Physics and Material Science DivisionSaha Institute of Nuclear Physics, HBNI, 1/AF Bidhannagar Kolkata- 700064 India
| | - Biswarup Satpati
- Surface Physics and Material Science DivisionSaha Institute of Nuclear Physics, HBNI, 1/AF Bidhannagar Kolkata- 700064 India
| | - Debasmita Sardar
- Department of ChemistryUniversity of Calcutta 92, A. P. C. Road Kolkata- 700009 India
| | - Manoj Kumar Ghosalya
- Catalysis Division and Center of Excellence on Surface ScienceCSIR-National Chemical Laboratory Pune- 411 008 India
| | - Tanushree Bala
- Department of ChemistryUniversity of Calcutta 92, A. P. C. Road Kolkata- 700009 India
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Sardar D, Ahmed MA, Bandyopadhyay S, Ghosalya MK, Bala T. An organic phase transmetallation approach for synthesis of hollow Ni–Au nanocomposites with tunable cavity size. NEW J CHEM 2018. [DOI: 10.1039/c8nj03668c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Hydrophobized HAuCl4 entered Ni nanoparticles through the fractures on the surface initiating transmetallation at the centre, yielding hollow Ni–Au composites.
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Affiliation(s)
- Debasmita Sardar
- Department of Chemistry
- University of Calcutta
- Kolkata-700009
- India
| | | | | | - Manoj Kumar Ghosalya
- Catalysis Division and Center of Excellence on Surface Science
- CSIR—National Chemical Laboratory
- Pune 411 008
- India
| | - Tanushree Bala
- Department of Chemistry
- University of Calcutta
- Kolkata-700009
- India
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Abstract
The increasingly rapid accumulation of genomic information is revolutionizing natural products discovery. However, the translation of sequence data to chemical products remains a challenge. Here, we detail methods used to circumvent the supply problem of cyanobactin natural products, both by engineered synthesis in Escherichia coli and by using purified enzymes in vitro. Such methodologies exploit nature's strategies of combinatorial chemistry in the cyanobactin class of RiPP natural products. As a result, it is possible to synthesize a wide variety of natural and unnatural compounds.
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Affiliation(s)
- D Sardar
- University of Utah, Salt Lake City, UT, United States
| | - M D Tianero
- University of Utah, Salt Lake City, UT, United States
| | - E W Schmidt
- University of Utah, Salt Lake City, UT, United States.
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Sardar D, Neogi SK, Bandyopadhyay S, Satpati B, Ahir M, Adhikary A, Jain R, Gopinath CS, Bala T. Multifaceted core–shell nanoparticles: superparamagnetism and biocompatibility. NEW J CHEM 2015. [DOI: 10.1039/c5nj01481f] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
A facile method for the synthesis of NicoreAgshell and NicoreAushell nanoparticles with suitable surface modification for the latter has been demonstrated with potential applications.
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Affiliation(s)
| | - S. K. Neogi
- CRNN
- University of Calcutta
- Salt Lake
- India
- Department of Physics
| | | | - Biswarup Satpati
- Surface Physics and Material Science Division
- Saha Institute of Nuclear Physics
- Kolkata-64
- India
| | | | | | - Ruchi Jain
- Catalysis Division and Center of Excellence on Surface Science
- CSIR – National Chemical Laboratory
- Pune-411 008
- India
| | - Chinnakonda S. Gopinath
- Catalysis Division and Center of Excellence on Surface Science
- CSIR – National Chemical Laboratory
- Pune-411 008
- India
| | - Tanushree Bala
- Department of Chemistry
- University of Calcutta
- Kolkata
- India
- CRNN
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Pedraza F, Yust B, Tsin A, Sardar D. NIR to NIR upconversion in KYb2F7: RE 3+ (RE = Tm, Er) nanoparticles for biological imaging. Proc SPIE Int Soc Opt Eng 2014; 8956. [PMID: 26120238 DOI: 10.1117/12.2037913] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Until recently, many contrast agents widely used in biological imaging have absorbed and emitted in the visible region, limiting their usefulness for deeper tissue imaging. In order to push the boundaries of deep tissue imaging with non-ionizing radiation, contrast agents in the near infrared (NIR) regime, which is not strongly absorbed or scattered by most tissues, are being sought after. Upconverting nanoparticles (UCNPs) are attractive candidates since their upconversion emission is tunable with a very narrow bandwidth and they do not photobleach or blink. The upconversion produced by the nanoparticles can be tailored for NIR to NIR by carefully choosing the lanthanide dopants and dopant ratios such as KYb2F7: RE3+ (RE = Tm, Er). Spectroscopic characterization was done by analyzing absorption, fluorescence, and quantum yield data. In order to study the toxicity of the nanoparticles Monkey Retinal Endothelial Cells (MREC) were cultivated in 24 well plates and then treated with nanoparticles at different concentrations in triplicate to obtain the optimal concentration for in vivo experiments. It will be shown that these UCNPs do not elicit a strong toxic response such as quantum dots and some noble metal nanoparticles. 3-D optical slices of nanoparticle treated fibroblast cells were imaged using a confocal microscope where the nucleus and cytoplasm were stained with DAPI and Alexa Fluor respectively. These results presented support the initial assumption, which suggests that KYb2F7: RE3+ would be excellent candidates for NIR contrast agents.
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Affiliation(s)
- F Pedraza
- University of Texas at San Antonio, Physics and Astronomy Department
| | - B Yust
- University of Texas at San Antonio, Physics and Astronomy Department
| | - A Tsin
- University of Texas at San Antonio, Department of Biology
| | - D Sardar
- University of Texas at San Antonio, Physics and Astronomy Department
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Sardar D, Neogi SK, Bandyopadhyay S, Satpati B, Jain R, Gopinath CS, Bala T. A facile method for the synthesis of Co-core Au-shell nanohybrid. NEW J CHEM 2014. [DOI: 10.1039/c4nj00733f] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Heterostructured Co–Au core–shell nanoparticles have been synthesized by reducing AuCl4− ions on cobalt nanoparticles after a minor but effective modification of cobalt surface by an amine.
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Affiliation(s)
- Debasmita Sardar
- Department of Chemistry
- University of Calcutta
- Kolkata-700009, India
- CRNN
- University of Calcutta
| | - S. K. Neogi
- CRNN
- University of Calcutta
- Kolkata-700098, India
- Department of Physics
- University of Calcutta
| | - S. Bandyopadhyay
- CRNN
- University of Calcutta
- Kolkata-700098, India
- Department of Physics
- University of Calcutta
| | - Biswarup Satpati
- Surface Physics and Material Science Division
- Saha Institute of Nuclear Physics
- Kolkata-64, India
| | - Ruchi Jain
- Catalysis Division and Center of Excellence on Surface Science
- CSIR – National Chemical Laboratory
- Pune-411 008, India
| | - Chinnakonda S. Gopinath
- Catalysis Division and Center of Excellence on Surface Science
- CSIR – National Chemical Laboratory
- Pune-411 008, India
| | - Tanushree Bala
- Department of Chemistry
- University of Calcutta
- Kolkata-700009, India
- CRNN
- University of Calcutta
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Sardar D, Naskar B, Sanyal A, Moulik SP, Bala T. Organic–inorganic hybrid: a novel template for synthesis of nanostructured Ag. RSC Adv 2014. [DOI: 10.1039/c3ra43378a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Rajpal R, Singh V, Siddiqui V, Nayak C, Majunder A, Sardar D, Sivadas P, Banoth K. Asclepias currasavica- A multicentric, randomized, double-blind homoeopathic pathogenetic trial. Indian Journal of Research in Homoeopathy 2011. [DOI: 10.53945/2320-7094.1722] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
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Bhunia P, Sardar D, Sarker K, Ray U, Wu JS, Lu TH, Sinha C. Nickel(II)-azido/thiocyanato complexes of 1-alkyl-2-(arylazo) imidazole: single crystal X-ray structure of [Ni(Pai-Me)2(N3)2] (Pai-Me=1-methyl-2(phenylazo)imidazole). J COORD CHEM 2010. [DOI: 10.1080/00958970802291282] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- P. Bhunia
- a Department of Chemistry, Inorganic Chemistry Section , Jadavpur University , Kolkata 700 032, India
| | - D. Sardar
- a Department of Chemistry, Inorganic Chemistry Section , Jadavpur University , Kolkata 700 032, India
| | - K.K. Sarker
- a Department of Chemistry, Inorganic Chemistry Section , Jadavpur University , Kolkata 700 032, India
| | - U.S. Ray
- a Department of Chemistry, Inorganic Chemistry Section , Jadavpur University , Kolkata 700 032, India
| | - J.-S. Wu
- b Department of Physics , National Tsing Hua University , Hsinchu, Taiwan 300, ROC
| | - T.-H. Lu
- b Department of Physics , National Tsing Hua University , Hsinchu, Taiwan 300, ROC
| | - C. Sinha
- a Department of Chemistry, Inorganic Chemistry Section , Jadavpur University , Kolkata 700 032, India
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Sarker KK, Sardar D, Suwa K, Otsuki J, Sinha C. Cadmium(II) complexes of (arylazo)imidazoles: synthesis, structure, photochromism, and density functional theory calculation. Inorg Chem 2007; 46:8291-301. [PMID: 17824607 DOI: 10.1021/ic7012073] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Reaction between CdX2 and 1-alkyl-2-(phenylazo)imidazole (RaaiR') has isolated complexes of composition Cd(RaaiR')2X2 in MeOH or MeCN. Crystallization of Cd(RaaiR')2I2 from N,N-dimethylformamide (DMF) has separated [Cd(RaaiR')I2.DMF], while Cd(RaaiR')2X2 (X = Cl and Br) remains unchanged in its composition upon crystallization under identical conditions. The structure has been established by spectral (UV-vis and 1H NMR) data and confirmation in the latter case by a single-crystal X-ray diffraction study of [Cd(TaiMe)I2.DMF] [where TaiMe = 1-methyl-2-(p-tolylazo)imidazole]. UV-light irradiation in a MeCN solution of Cd(RaaiR')2I2 and [Cd(RaaiR')I2.DMF] shows trans-to-cis isomerization of coordinated azoimidazole. The reverse transformation, cis-to-trans, is very slow with visible light irradiation. Quantum yields (phit-->c) of trans-to-cis isomerization are calculated, and the free ligand shows higher phi values than their cadmium(II) iodo complexes. The cis-to-trans isomerization is a thermally induced process. The activation energy (Ea) of cis-to-trans isomerization is calculated by a controlled-temperature experiment. The effects of the anions (Cl-, Br-, I-, and ClO4-) and the number of coordinated azoimidazoles (RaaiR') [Cd(RaaiR') or Cd(RaaiR')2] on the rate and quantum yields of photochromism are established in this work. A slow rate of photoisomerization of [Cd(RaaiR')4](ClO4)2 compared to Cd(RaaiR')I2 or Cd(RaaiR')2X2 may be associated with the increased mass and rotor volume of the complexes. The rate of isomerization is also dependent on the nature of X and follows the sequence Cd(RaaiR')2Cl2 < Cd(RaaiR')2Br2 < Cd(RaaiR')2I2. It may be related to the size and electronegativity of halide, which reduces the effective molar association in the order of I < Br < Cl and hence the rate. Gaussian 03 calculations of representative complexes and free ligands are used to explain the difference in the rates and quantum yields of photoisomerization.
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Affiliation(s)
- K K Sarker
- Department of Chemistry, Inorganic Chemistry Section, Jadavpur University, Kolkata 7000 032, India
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Mukherjee P, Alam S, Sardar D, Pahari A, Roy S, Chowdhury A. Persistence and dissipation of linuron (Afalon-50wp) in pea cropped soil and its effect on soil microorganisms. Bull Environ Contam Toxicol 2006; 76:407-14. [PMID: 16652253 DOI: 10.1007/s00128-006-0936-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2005] [Accepted: 12/28/2005] [Indexed: 05/08/2023]
Affiliation(s)
- P Mukherjee
- Pesticide Residue Laboratory, Department of Agricultural Chemicals, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, Nadia, Pin 741252 West Bengal, India
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Sardar D, Radcliffe SV, Baer E. Effects of high hydrostatic pressure on the mechanical behavior of a crystalline polymer-polyoxymethylene. POLYM ENG SCI 1968. [DOI: 10.1002/pen.760080409] [Citation(s) in RCA: 54] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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