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Deekshitha S, Neelavara Makkithaya K, Sajankila Nadumane S, Hussain G, Sankar Mal S, Sundara BK, Pai P, Mazumder N. Spectroscopic evaluation of sesame and mustard oils treated with Murchana method. Lasers Med Sci 2024; 39:99. [PMID: 38602564 PMCID: PMC11008066 DOI: 10.1007/s10103-024-04050-x] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Accepted: 04/05/2024] [Indexed: 04/12/2024]
Abstract
In recent years, there has been a growing interest in traditional medicinal practices such as Ayurveda, which emphasizes the use of natural ingredients for various therapeutic purposes. Vegetable oils are an integral part of our diet and have several applications in the cosmetics and healthcare industries. These oils have also been prescribed in ancient Ayurveda texts to treat various health problems. Ayurveda prescribes a processing technique called 'Murchana' to improve the therapeutic nature of the oils. Spectroscopic techniques have been used for quality assessment in many fields. High sensitivity and a low detection rate make spectroscopy a formidable analytical technique. This study focusses on the spectroscopic analysis of sesame and mustard oils prepared using the ayurvedic processing method 'Murchana'. Spectroscopic analysis techniques including UV-Vis absorbance spectroscopy, fluorescence spectroscopy, and FTIR spectroscopy were employed to study the oils. Origin software was used to plot graphs of the spectra. The results indicated that the murchana process may reduce the components of the oil responsible for its oxidation, thereby increasing the shelf life of the oils. However, further investigations, including other spectroscopy and chromatography techniques, will prove beneficial in ascertaining the effects of the murchana process on vegetable oils. The study's findings also suggest that spectroscopic techniques can be used to supplement chemical techniques to investigate the characteristics of vegetable oils.
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Affiliation(s)
- S Deekshitha
- Department of Rasashastra and Bhaishajya Kalpana, Sri Dharmasthala Manjunatheshwara College of Ayurveda & Hospital, Hassan, 573201, India
| | - Kausalya Neelavara Makkithaya
- Department of Biophysics, Manipal School of Life Sciences, Manipal Academy of Higher Education, Manipal, 576104, India
| | - Sharmila Sajankila Nadumane
- Department of Biophysics, Manipal School of Life Sciences, Manipal Academy of Higher Education, Manipal, 576104, India
| | - Gazala Hussain
- Department of Rasashastra and Bhaishajya Kalpana, Sri Dharmasthala Manjunatheshwara College of Ayurveda & Hospital, Hassan, 573201, India
| | - Sib Sankar Mal
- Materials and Catalysis Lab, Department of Chemistry, National Institute of Technology Karnataka, Surathkal, Karnataka, 575025, India
| | - Babitha K Sundara
- Department of Biophysics, Manipal School of Life Sciences, Manipal Academy of Higher Education, Manipal, 576104, India
| | - Padmini Pai
- Department of Biophysics, Manipal School of Life Sciences, Manipal Academy of Higher Education, Manipal, 576104, India
| | - Nirmal Mazumder
- Department of Biophysics, Manipal School of Life Sciences, Manipal Academy of Higher Education, Manipal, 576104, India.
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N P, Chakraborty I, Mal SS, Bharath Prasad AS, Mahato KK, Mazumder N. Evaluation of physicochemical properties of citric acid crosslinked starch elastomers reinforced with silicon dioxide. RSC Adv 2024; 14:139-146. [PMID: 38173576 PMCID: PMC10758800 DOI: 10.1039/d3ra07868j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2023] [Accepted: 12/11/2023] [Indexed: 01/05/2024] Open
Abstract
Thermoplastic starch (TPS), derived from renewable resources, offers advantages such as biodegradability and lower production costs compared to petroleum-based plastics. However, its limited mechanical properties pose a challenge for broader applications. This research aims to explore the potential of enhancing the mechanical and barrier properties of TPS films through the incorporation of silicon dioxide as a reinforcement filler and citric acid as a crosslinking agent. By introducing silicon dioxide as a reinforcement filler, the mechanical strength of the TPS films is expected to be improved. Additionally, the incorporation of citric acid as a crosslinking agent is anticipated to enhance the barrier properties of the films. The combination of these additives holds promise for creating TPS films with improved performance, contributing to the development of sustainable and environmentally friendly materials in various industries. The results reveal that SiO2 improves the stiffness of the films at lower concentrations but causes brittleness at higher concentrations. In contrast, citric acid crosslinked films exhibit improved flexibility and density. Scanning electron microscopy demonstrates the morphological changes in the films, with SiO2 affecting surface roughness and aggregate formation. SiO2 reduces film thickness and transparency, while citric acid enhances water resistance and barrier properties. X-ray diffraction analysis shows a reduction in crystallinity due to the plasticization process. Fourier-transform infrared spectroscopy highlights chemical changes and antimicrobial activity is observed with citric acid against specific bacteria. The soil burial test reveals that citric acid crosslinked films exhibit slower degradation due to antimicrobial properties. The combination of SiO2 reinforcement and citric acid crosslinking enhances the overall performance of the films, promising sustainable and environmentally friendly materials for various applications.
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Affiliation(s)
- Pooja N
- Department of Biophysics, Manipal School of Life Sciences, Manipal Academy of Higher Education Manipal Karnataka 576104 India
| | - Ishita Chakraborty
- Department of Biophysics, Manipal School of Life Sciences, Manipal Academy of Higher Education Manipal Karnataka 576104 India
| | - Sib Sankar Mal
- Department of Chemistry, National Institute of Technology Karnataka 575025 India
| | - Alevoor Srinivas Bharath Prasad
- Department of Public Health and Genomics, Manipal School of Life Sciences, Manipal Academy of Higher Education Manipal Karnataka 576104 India
| | - Krishna Kishore Mahato
- Department of Biophysics, Manipal School of Life Sciences, Manipal Academy of Higher Education Manipal Karnataka 576104 India
| | - Nirmal Mazumder
- Department of Biophysics, Manipal School of Life Sciences, Manipal Academy of Higher Education Manipal Karnataka 576104 India
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3
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Maity S, Biradar BR, Srivastava S, Chandewar PR, Shee D, Pratim Das P, Mal SS. Waste dry cell derived photo-reduced graphene oxide and polyoxometalate composite for solid-state supercapacitor applications. Phys Chem Chem Phys 2023; 25:24613-24624. [PMID: 37665020 DOI: 10.1039/d3cp01872e] [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: 09/05/2023]
Abstract
In the modern era, realizing highly efficient supercapacitors (SCs) derived through green routes is paramount to reducing environmental impact. This study demonstrates ways to recycle and reuse used waste dry cell anodes to synthesize nanohybrid electrodes for SCs. Instead of contributing to landfill and the emission of toxic gas to the environment, dry cells are collected and converted into a resource for improved SC cells. The high performance of the electrode was achieved by exploiting battery-type polyoxometalate (POM) clusters infused on a reduced graphene oxide (rGO) surface. Polyoxometalate (K5[α-SiMo2VW9O40]) assisted in the precise bottom-up reduction of graphene oxide (GO) under UV irradiation at room temperature to produce vanadosilicate embedded photo-reduced graphene oxide (prGO-Mo2VW9O40). Additionally, a chemical reduction route for GO (crGO) was trialed to relate to the prGO, followed by the integration of a faradaic monolayer (crGO-Mo2VW9O40). Both composite frameworks exhibit unique hierarchical heterostructures that offer synergic effects between the dual components. As a result, the hybrid material's ion transport kinetics and electrical conductivity enhance the critical electrochemical process at the electrode's interface. The simple co-participation method delivers a remarkable specific capacity (capacitance) of 405 mA h g-1 (1622 F g-1) and 117 mA h g-1 (470 F g-1) for prGO-Mo2VW9O40 and crGO-Mo2VW9O40 nanocomposites alongside high capacitance retentions of 94.5% and 82%, respectively, at a current density of 0.3 A g-1. Furthermore, the asymmetric electrochromic supercapacitor crGO//crGO-Mo2VW9O40 was designed, manifesting a broad operating potential (1.2 V). Finally, the asymmetric electrode material resulted in an enhanced specific capacity, energy, and power of 276.8 C g-1, 46.16 W h kg-1, and 1195 W kg-1, respectively, at a current density of 0.5 A g-1. The electrode materials were tested in the operating of a DC motor.
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Affiliation(s)
- Sukanya Maity
- Low Dimensional Physics Laboratory, Department of Physics, National Institute of Technology Karnataka, Surathkal 5750525, India.
| | - Bhimaraya R Biradar
- Low Dimensional Physics Laboratory, Department of Physics, National Institute of Technology Karnataka, Surathkal 5750525, India.
| | - Saurabh Srivastava
- Materials and Catalysis Laboratory, Department of Chemistry, National Institute of Technology Karnataka, Surathkal 5750525, India.
| | - Pranay R Chandewar
- Department of Chemical Engineering, Indian Institute of Technology Hyderabad, Kandi, Sangareddy 502284, Telangana, India
| | - Debaprasad Shee
- Department of Chemical Engineering, Indian Institute of Technology Hyderabad, Kandi, Sangareddy 502284, Telangana, India
| | - Partha Pratim Das
- Low Dimensional Physics Laboratory, Department of Physics, National Institute of Technology Karnataka, Surathkal 5750525, India.
| | - Sib Sankar Mal
- Materials and Catalysis Laboratory, Department of Chemistry, National Institute of Technology Karnataka, Surathkal 5750525, India.
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J E M, Chandewar PR, Shee D, Mal SS. High-performance hybrid supercapacitor-immobilized Wells-Dawson polyoxometalates on activated carbon electrodes. RSC Adv 2023; 13:26744-26754. [PMID: 37681037 PMCID: PMC10481258 DOI: 10.1039/d3ra04478e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Accepted: 08/17/2023] [Indexed: 09/09/2023] Open
Abstract
The nanofabrication of electroactive hybrid materials for next-generation energy storage devices is becoming increasingly significant as supercapacitor (SC) technology develops rapidly. The present study utilizes activated carbon (AC) templates reinforced with Wells-Dawson polyoxotungstates (POMs) to produce nanohybrid electrodes for high-performance supercapacitors. This study analyzes Wells-Dawson polyoxotungstates (P2W18) for the first time integrated with AC, and its structural and electrochemical performances are discussed. First, the electrochemical performances of symmetric supercapacitors were characterized in an acidic aqueous electrolyte (0.5 M H2SO4). It was observed that a supercapacitor cell containing the 5 wt% AC-P2W18 hybrid symmetric displayed a noteworthy specific capacitance of 289 F g-1 and a remarkable energy density of 40 W h kg-1. Moreover, 5% AC-P2W18 symmetric supercapacitor cells showed 89% cyclic stability over 4000 cycles. Three LED lights were charged onto the electrode. The LEDs continued to illuminate continuously for red until 160 seconds, yellow until 20 seconds, and blue until 10 seconds after removing the electrode from the electrochemical workstation, demonstrating the device's power and energy density.
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Affiliation(s)
- Madhusree J E
- Materials and Catalysis Laboratory, Department of Chemistry, National Institute of Technology Karnataka Surathkal 575025 India
| | - Pranay R Chandewar
- Department of Chemical Engineering, Indian Institute of Technology Hyderabad Kandi Sangareddy 502284 Telangana India
| | - Debaprasad Shee
- Department of Chemical Engineering, Indian Institute of Technology Hyderabad Kandi Sangareddy 502284 Telangana India
| | - Sib Sankar Mal
- Materials and Catalysis Laboratory, Department of Chemistry, National Institute of Technology Karnataka Surathkal 575025 India
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Chen MC, Govindaraju I, Wang WH, Chen WL, Mumbrekar KD, Mal SS, Sarmah B, Baruah VJ, Srisungsitthisunti P, Karunakara N, Mazumder N, Zhuo GY. Revealing the Structural Organization of Gamma-irradiated Starch Granules Using Polarization-resolved Second Harmonic Generation Microscopy. Microscopy and Microanalysis 2023; 29:1450-1459. [PMID: 37488816 DOI: 10.1093/micmic/ozad058] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Revised: 04/12/2023] [Accepted: 04/24/2023] [Indexed: 07/26/2023]
Abstract
Starch is a semi-crystalline macromolecule with the presence of amorphous and crystalline components. The amorphous amylose and crystalline amylopectin regions in starch granules are susceptible to certain physical modifications, such as gamma irradiation. Polarization-resolved second harmonic generation (P-SHG) microscopy in conjunction with SHG-circular dichroism (CD) was used to assess the three-dimensional molecular order and inherent chirality of starch granules and their reaction to different dosages of gamma irradiation. For the first time, the relationship between starch achirality (χ21/χ16 and χ22/χ16) and chirality (χ14/χ16) determining susceptibility tensor ratios has been elucidated. The results showed that changes in the structure and orientation of long-chain amylopectin were supported by the decrease in the SHG anisotropy factor and the χ22/χ16 ratio. Furthermore, SHG-CD illustrated the molecular tilt angle by revealing the arrangement of amylopectin molecules pointing either upward or downward owing to molecular polarity.
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Affiliation(s)
- Ming-Chi Chen
- Institute of Translational Medicine and New Drug Development, College of Medicine, China Medical University, No. 91, Xueshi Rd., North Dist., Taichung 404333, Taiwan (R.O.C.)
| | - Indira Govindaraju
- Department of Biophysics, Manipal School of Life Sciences, Manipal Academy of Higher Education, Planetarium complex, Udupi Dist., Manipal, Karnataka, India
| | - Wei-Hsun Wang
- Institute of Translational Medicine and New Drug Development, College of Medicine, China Medical University, No. 91, Xueshi Rd., North Dist., Taichung 404333, Taiwan (R.O.C.)
| | - Wei-Liang Chen
- Center for Condensed Matter Sciences, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Da'an Dist., Taipei 106319, Taiwan (R.O.C.)
| | - Kamalesh Dattaram Mumbrekar
- Department of Radiation Biology and Toxicology, Manipal School of Life Sciences, Manipal Academy of Higher Education, Planetarium complex, Udupi Dist., Manipal, Karnataka, India
| | - Sib Sankar Mal
- Materials and Catalysis Lab, Department of Chemistry, National Institute of Technology Karnataka, Surathkal, Mangalore Dist., Karnataka, 575025, India
| | - Bhaswati Sarmah
- Department of Plant Breeding and Genetics, Assam Agricultural University, Jorhat, Assam 785013, India
| | - Vishwa Jyoti Baruah
- Department of Bioinformatics, Dibrugarh University, Dibrugarh, Assam 786004, India
| | - Pornsak Srisungsitthisunti
- Department of Production Engineering, Faculty of Engineering, King Mongkut's University of Technology North Bangkok, Bangkok 10800, Thailand
| | - Naregundi Karunakara
- Centre for Application of Radioisotopes and Radiation Technology (CARRT), Mangalore University, Mangalore 574199, India
- Center for Advanced Research in Environmental Radioactivity (CARER), Mangalore University, Mangalore 574199, India
| | - Nirmal Mazumder
- Department of Biophysics, Manipal School of Life Sciences, Manipal Academy of Higher Education, Planetarium complex, Udupi Dist., Manipal, Karnataka, India
| | - Guan-Yu Zhuo
- Institute of Translational Medicine and New Drug Development, College of Medicine, China Medical University, No. 91, Xueshi Rd., North Dist., Taichung 404333, Taiwan (R.O.C.)
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Bhat N, Yadav AK, Karmakar M, Thakur A, Mal SS, Dutta S. Preparation of 5-(Acyloxymethyl)furfurals from Carbohydrates Using Zinc Chloride/Acetic Acid Catalyst System and Their Synthetic Value Addition. ACS Omega 2023; 8:8119-8124. [PMID: 36873025 PMCID: PMC9979359 DOI: 10.1021/acsomega.3c00143] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Accepted: 02/02/2023] [Indexed: 06/18/2023]
Abstract
5-(Acyloxymethyl)furfurals (AMFs) have received considerable attention as hydrophobic, stable, and halogen-free congeners of 5-(hydroxymethyl)furfural (HMF) for synthesizing biofuels and biochemicals. In this work, AMFs have been prepared directly from carbohydrates in satisfactory yields using the combination of ZnCl2 as the Lewis acid catalyst and carboxylic acid as the Brønsted acid catalyst. The process was initially optimized for 5-(acetoxymethyl)furfural (AcMF) and then extended to producing other AMFs. The effects of reaction temperature, duration, loading of the substrate, and dosage of ZnCl2 on AcMF yield were explored. Fructose and glucose provided AcMF in 80% and 60% isolated yield, respectively, under optimized parameters (5 wt % substrate, AcOH, 4 equiv ZnCl2, 100 °C, 6 h). Finally, AcMF was converted into high-value chemicals, such as 5-(hydroxymethyl)furfural, 2,5-bis(hydroxymethyl)furan, 2,5-diformylfuran, levulinic acid, and 2,5-furandicarboxylic acid in satisfactory yields to demonstrate the synthetic versatility of AMFs as carbohydrate-derived renewable chemical platforms.
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Affiliation(s)
- Navya
Subray Bhat
- Department
of Chemistry, National Institute of Technology
Karnataka (NITK), Surathkal, Mangalore 575025, Karnataka, India
| | - Abhishek Kumar Yadav
- Department
of Chemistry, National Institute of Technology
Karnataka (NITK), Surathkal, Mangalore 575025, Karnataka, India
| | - Manisha Karmakar
- Department
of Chemistry, Jadavpur University, Kolkata 700032, West Bengal, India
| | - Arunabha Thakur
- Department
of Chemistry, Jadavpur University, Kolkata 700032, West Bengal, India
| | - Sib Sankar Mal
- Department
of Chemistry, National Institute of Technology
Karnataka (NITK), Surathkal, Mangalore 575025, Karnataka, India
| | - Saikat Dutta
- Department
of Chemistry, National Institute of Technology
Karnataka (NITK), Surathkal, Mangalore 575025, Karnataka, India
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Chakraborty I, N. P, Banik S, Govindaraju I, Das K, Mal SS, Zhuo G, Rather MA, Mandal M, Neog A, Biswas R, Managuli V, Datta A, Mahato KK, Mazumder N. Synthesis and detailed characterization of sustainable starch‐based bioplastic. J Appl Polym Sci 2022. [DOI: 10.1002/app.52924] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Ishita Chakraborty
- Department of Biophysics, Manipal School of Life Sciences Manipal Academy of Higher Education Manipal Karnataka India
| | - Pooja N.
- Department of Biophysics, Manipal School of Life Sciences Manipal Academy of Higher Education Manipal Karnataka India
| | - Soumyabrata Banik
- Department of Biophysics, Manipal School of Life Sciences Manipal Academy of Higher Education Manipal Karnataka India
| | - Indira Govindaraju
- Department of Biophysics, Manipal School of Life Sciences Manipal Academy of Higher Education Manipal Karnataka India
| | - Kuheli Das
- Institute of Chemistry Academia Sinica Nankang Taipei Taiwan
| | - Sib Sankar Mal
- Department of Chemistry National Institute of Technology Karnataka India
| | - Guan‐Yu Zhuo
- Institute of New Drug Development China Medical University Taichung Taiwan
| | - Muzamil Ahmad Rather
- Department of Molecular Biology and Biotechnology Tezpur University Tezpur Assam India
| | - Manabendra Mandal
- Department of Molecular Biology and Biotechnology Tezpur University Tezpur Assam India
| | - Ashamoni Neog
- Applied Optics and Photonics Lab, Department of Physics Tezpur University Tezpur Assam India
| | - Rajib Biswas
- Applied Optics and Photonics Lab, Department of Physics Tezpur University Tezpur Assam India
| | - Vishwanath Managuli
- Department of Mechanical and Industrial Engineering Manipal Institute of Technology, Manipal Academy of Higher Education Manipal Karnataka India
| | - Amitabha Datta
- Institute of Chemistry Academia Sinica Nankang Taipei Taiwan
| | - Krishna Kishore Mahato
- Department of Biophysics, Manipal School of Life Sciences Manipal Academy of Higher Education Manipal Karnataka India
| | - Nirmal Mazumder
- Department of Biophysics, Manipal School of Life Sciences Manipal Academy of Higher Education Manipal Karnataka India
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8
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Chakraborty I, N P, Mal SS, Paul UC, Rahman MH, Mazumder N. An Insight into the Gelatinization Properties Influencing the Modified Starches Used in Food Industry: A review. FOOD BIOPROCESS TECH 2022. [DOI: 10.1007/s11947-022-02761-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
AbstractNative starch is subjected to various forms of modification to improve its structural, mechanical, and thermal properties for wider applications in the food industry. Physical, chemical, and dual modifications have a substantial effect on the gelatinization properties of starch. Consequently, this review explores and compares the different methods of starch modification applicable in the food industry and their effect on the gelatinization properties such as onset temperature (To), peak gelatinization temperature (Tp), end set temperature (Tc), and gelatinization enthalpy (ΔH), studied using differential scanning calorimetry (DSC). Chemical modifications including acetylation and acid hydrolysis decrease the gelatinization temperature of starch whereas cross-linking and oxidation result in increased gelatinization temperatures. Common physical modifications such as heat moisture treatment and annealing also increase the gelatinization temperature. The gelatinization properties of modified starch can be applied for the improvement of food products such as ready-to-eat, easily heated or frozen food, or food products with longer shelf life.
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Chakraborty I, Rongpipi S, Govindaraju I, B R, Mal SS, Gomez EW, Gomez ED, Kalita RD, Nath Y, Mazumder N. An insight into microscopy and analytical techniques for morphological, structural, chemical, and thermal characterization of cellulose. Microsc Res Tech 2022; 85:1990-2015. [PMID: 35040538 DOI: 10.1002/jemt.24057] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Revised: 12/30/2021] [Accepted: 12/30/2021] [Indexed: 11/07/2022]
Abstract
Cellulose obtained from plants is a bio-polysaccharide and the most abundant organic polymer on earth that has immense household and industrial applications. Hence, the characterization of cellulose is important for determining its appropriate applications. In this article, we review the characterization of cellulose morphology, surface topography using microscopic techniques including optical microscopy, transmission electron microscopy, scanning electron microscopy, and atomic force microscopy. Other physicochemical characteristics like crystallinity, chemical composition, and thermal properties are studied using techniques including X-ray diffraction, Fourier transform infrared, Raman spectroscopy, nuclear magnetic resonance, differential scanning calorimetry, and thermogravimetric analysis. This review may contribute to the development of using cellulose as a low-cost raw material with anticipated physicochemical properties. HIGHLIGHTS: Morphology and surface topography of cellulose structure is characterized using microscopy techniques including optical microscopy, transmission electron microscopy, scanning electron microscopy, and atomic force microscopy. Analytical techniques used for physicochemical characterization of cellulose include X-ray diffraction, Fourier transform infrared spectroscopy, Raman spectroscopy, nuclear magnetic resonance spectroscopy, differential scanning calorimetry, and thermogravimetric analysis.
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Affiliation(s)
- Ishita Chakraborty
- Department of Biophysics, Manipal School of Life Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, 576104, India
| | - Sintu Rongpipi
- Department of Chemical Engineering, The Pennsylvania State University, State College, Pennsylvania, USA
| | - Indira Govindaraju
- Department of Biophysics, Manipal School of Life Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, 576104, India
| | - Rakesh B
- Department of Life Science, CHRIST (Deemed to be University), Bangalore, Karnataka, 560029, India
| | - Sib Sankar Mal
- Department of Chemistry, National Institute of Technology, Mangaluru, Karnataka, 575025, India
| | - Esther W Gomez
- Department of Chemical Engineering, The Pennsylvania State University, State College, Pennsylvania, USA
- Department of Biomedical Engineering, The Pennsylvania State University, State College, Pennsylvania, USA
| | - Enrique D Gomez
- Department of Chemical Engineering, The Pennsylvania State University, State College, Pennsylvania, USA
- Department of Materials Science and Engineering, The Pennsylvania State University, State College, Pennsylvania, USA
- Materials Research Institute, The Pennsylvania State University, State College, Pennsylvania, USA
| | - Ranjan Dutta Kalita
- Department of Biotechnology, Royal Global University, Guwahati, Assam, 781035, India
| | - Yuthika Nath
- Department of Serology, State Forensic Science Laboratory, Guwahati, India
| | - Nirmal Mazumder
- Department of Biophysics, Manipal School of Life Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, 576104, India
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10
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Govindaraju I, Zhuo GY, Chakraborty I, Melanthota SK, Mal SS, Sarmah B, Baruah VJ, Mahato KK, Mazumder N. Investigation of structural and physico-chemical properties of rice starch with varied amylose content: A combined microscopy, spectroscopy, and thermal study. Food Hydrocoll 2022. [DOI: 10.1016/j.foodhyd.2021.107093] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Vannathan AA, Thakre D, Ali SR, De M, Banerjee A, Mal SS. Investigations into the supercapacitor activity of bisphosphonate-polyoxovanadate compounds. J SOLID STATE CHEM 2021. [DOI: 10.1016/j.jssc.2021.122566] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Vannathan A, Kella T, Shee D, Mal SS. One-Pot Synthesis of Polyoxometalate Decorated Polyindole for Energy Storage Supercapacitors. ACS Omega 2021; 6:11199-11208. [PMID: 34056275 PMCID: PMC8153914 DOI: 10.1021/acsomega.0c05967] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Accepted: 04/07/2021] [Indexed: 06/12/2023]
Abstract
The demand for energy storage supercapacitor devices has increased interest in completing all innovative technologies and renewable energy requirements. Here, we report a simple method of two polyoxomolybdate (H4[PVMo11O40] and H5[PV2Mo10O40]) doped polyindole (PIn) composites for electrochemical supercapacitors. The interactions between polyoxomolybdates and PIn were measured by Fourier transform infrared spectroscopy (FTIR), and powder XRD, and stability was measured by thermogravimetry. The field emission scanning microscopy (FESEM) was employed to investigate the morphology of the materials. The electrochemical measurements show that the PIn/PV2Mo10 electrode exhibits a higher capacitance of 198.09 F/g with an energy density of 10.19 Wh/kg and a power density of 198.54 W/kg at 0.2 A/g current density than the PIn/PVMo11 electrode. Both electrodes show a pseudocapacitance behavior due to the doping of redox-active polyoxomolybdates on the PIn surface and enhance the electrochemical properties. The electrodes' capacitive nature was measured by electrochemical impedance spectroscopy (EIS), which shows that the PIn/PVMo11 electrode has a resistive nature within the electrode-electrode interface. Moreover, the PIn/PV2Mo10 electrode offers remarkable cycle stability, retaining ∼84% of its capacitance after 10,000 cycles (∼83% for the PIn/PVMo11 electrode). The higher specific capacitance, faster charge/discharge rates, and higher cycle stability make them promising electrodes in supercapacitors.
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Affiliation(s)
- Anjana
Anandan Vannathan
- Materials
and Catalysis Laboratory, Department of Chemistry, National Institute of Technology Karnataka, Surathkal 575025, India
| | - Tatinaidu Kella
- Department
of Chemical Engineering, Indian Institute
of Technology Hyderabad, Kandi, Sangareddy, Telangana 502285, India
| | - Debaprasad Shee
- Department
of Chemical Engineering, Indian Institute
of Technology Hyderabad, Kandi, Sangareddy, Telangana 502285, India
| | - Sib Sankar Mal
- Materials
and Catalysis Laboratory, Department of Chemistry, National Institute of Technology Karnataka, Surathkal 575025, India
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13
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Bhat NS, Mal SS, Dutta S. Recent advances in the preparation of levulinic esters from biomass-derived furanic and levulinic chemical platforms using heteropoly acid (HPA) catalysts. Molecular Catalysis 2021. [DOI: 10.1016/j.mcat.2021.111484] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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14
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Vannathan AA, Maity S, Kella T, Shee D, Das PP, Mal SS. In situ vanadophosphomolybdate impregnated into conducting polypyrrole for supercapacitor. Electrochim Acta 2020. [DOI: 10.1016/j.electacta.2020.137286] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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15
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Govindaraju I, Pallen S, Umashankar S, Mal SS, Kaniyala Melanthota S, Mahato DR, Zhuo GY, Mahato KK, Mazumder N. Microscopic and spectroscopic characterization of rice and corn starch. Microsc Res Tech 2020; 83:490-498. [PMID: 32319189 DOI: 10.1002/jemt.23437] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Revised: 12/22/2019] [Accepted: 12/27/2019] [Indexed: 11/09/2022]
Abstract
Starch granules from rice and corn were isolated, and their molecular mechanism on interaction with α-amylase was characterized through biochemical test, microscopic imaging, and spectroscopic measurements. The micro-scale structure of starch granules were observed under an optical microscope and their average size was in the range 1-100 μm. The surface topological structures of starch with micro-holes due to the effect of α- amylase were also visualized under scanning electron microscope. The crystallinity was confirmed by X-ray diffraction patterns as well as second-harmonic generation microscopy. The change in chemical bonds before and after hydrolysis of the starch granules by α- amylase was determined by Fourier transform infrared spectroscopy. Combination of microscopy and spectroscopy techniques relates structural and chemical features that explain starch enzymatic hydrolysis which will provide a valid basis for future studies in food science and insights into the energy transformation dynamics.
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Affiliation(s)
- Indira Govindaraju
- Department of Biophysics, Manipal School of Life Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, 576104, India
| | - Sparsha Pallen
- Department of Biophysics, Manipal School of Life Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, 576104, India
| | - Suchitta Umashankar
- Department of Biophysics, Manipal School of Life Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, 576104, India
| | - Sib Sankar Mal
- Materials and Catalytic Laboratory, Department of Chemistry, NITK, Mangalore, India
| | - Sindhoora Kaniyala Melanthota
- Department of Biophysics, Manipal School of Life Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, 576104, India
| | | | - Guan-Yu Zhuo
- Institute of New Drug Development, China Medical University, Taichung, Taiwan.,Integrative Stem Cell Center, China Medical University Hospital, Taichung, Taiwan
| | - Krishna Kishore Mahato
- Department of Biophysics, Manipal School of Life Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, 576104, India
| | - Nirmal Mazumder
- Department of Biophysics, Manipal School of Life Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, 576104, India
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16
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Fraqueza G, Fuentes J, Krivosudský L, Dutta S, Mal SS, Roller A, Giester G, Rompel A, Aureliano M. Inhibition of Na +/K +- and Ca 2+-ATPase activities by phosphotetradecavanadate. J Inorg Biochem 2019; 197:110700. [PMID: 31075720 DOI: 10.1016/j.jinorgbio.2019.110700] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Revised: 04/16/2019] [Accepted: 04/25/2019] [Indexed: 02/07/2023]
Abstract
Polyoxometalates (POMs) are promising inorganic inhibitors for P-type ATPases. The experimental models used to study the effects of POMs on these ATPases are usually in vitro models using vesicles from several membrane sources. Very recently, some polyoxotungstates, such as the Dawson anion [P2W18O62]6-, were shown to be potent P-type ATPase inhibitors; being active in vitro as well as in ex-vivo. In the present study we broaden the spectrum of highly active inhibitors of Na+/K+-ATPase from basal membrane of epithelial skin to the bi-capped Keggin-type anion phosphotetradecavanadate Cs5.6H3.4PV14O42 (PV14) and we confront the data with activity of other commonly encountered polyoxovanadates, decavanadate (V10) and monovanadate (V1). The X-ray crystal structure of PV14 was solved and contains two trans-bicapped α-Keggin anions HxPV14O42(9-x)-. The anion is built up from the classical Keggin structure [(PO4)@(V12O36)] capped by two [VO] units. PV14 (10 μM) exhibited higher ex-vivo inhibitory effect on Na+/K+-ATPase (78%) than was observed at the same concentrations of V10 (66%) or V1 (33%). Moreover, PV14 is also a potent in vitro inhibitor of the Ca2+-ATPase activity (IC50 5 μM) exhibiting stronger inhibition than the previously reported activities for V10 (15 μM) and V1 (80 μM). Putting it all together, when compared both P-typye ATPases it is suggested that PV14 exibited a high potential to act as an in vivo inhibitor of the Na+/K+-ATPase associated with chloride secretion.
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Affiliation(s)
- Gil Fraqueza
- ISE, University of Algarve, 8005-139 Faro, Portugal; CCMar, University of Algarve, 8005-139 Faro, Portugal
| | - Juan Fuentes
- CCMar, University of Algarve, 8005-139 Faro, Portugal
| | - Lukáš Krivosudský
- Universität Wien, Fakultät für Chemie, Institut für Biophysikalische Chemie, Althanstr. 14, 1090 Wien, Austria; Comenius University, Faculty of Natural Sciences, Department of Inorganic Chemistry, Mlynská dolina, Ilkovičova 6, 842 15 Bratislava, Slovakia
| | - Saikat Dutta
- Department of Chemistry, National Institute of Technology Karnataka, Mangalore 575025, Karnataka, India
| | - Sib Sankar Mal
- Department of Chemistry, National Institute of Technology Karnataka, Mangalore 575025, Karnataka, India.
| | - Alexander Roller
- Universität Wien, Fakultät für Chemie, Zentrum für Röntgenstrukturanalyse, 1090 Wien, Austria
| | - Gerald Giester
- Universität Wien, Fakultät für Geowissenschaften, Geographie und Astronomie, Institut für Mineralogie und Kristallographie, 1090 Wien, Austria
| | - Annette Rompel
- Universität Wien, Fakultät für Chemie, Institut für Biophysikalische Chemie, Althanstr. 14, 1090 Wien, Austria.
| | - Manuel Aureliano
- CCMar, University of Algarve, 8005-139 Faro, Portugal; FCT, University of Algarve, 8005-139 Faro, Portugal.
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17
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Onkarappa SB, Javoor M, Mal SS, Dutta S. Efficient and Scalable Production of Alkyl Levulinates from Cellulose-Derived Levulinic Acid Using Heteropolyacid Catalysts. ChemistrySelect 2019. [DOI: 10.1002/slct.201803641] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
| | - Manjunath Javoor
- Department of Chemistry; National Institute of Technology Karnataka (NITK), Surathkal, Mangalore-; 575025, Karnataka India
| | - Sib Sankar Mal
- Department of Chemistry; National Institute of Technology Karnataka (NITK), Surathkal, Mangalore-; 575025, Karnataka India
| | - Saikat Dutta
- Department of Chemistry; National Institute of Technology Karnataka (NITK), Surathkal, Mangalore-; 575025, Karnataka India
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18
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Marques-da-Silva D, Fraqueza G, Lagoa R, Vannathan AA, Mal SS, Aureliano M. Polyoxovanadate inhibition of Escherichia coli growth shows a reverse correlation with Ca2+-ATPase inhibition. NEW J CHEM 2019. [DOI: 10.1039/c9nj01208g] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Polyoxovanadates were recently found to be the most active among a series of polyoxometalates against bacteria. In this study, a reverse correlation was found between the Ca2+-ATPase IC50 and the E. Coli GI50 values.
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Affiliation(s)
- Dorinda Marques-da-Silva
- ESTG, Polytechnic Institute of Leiria
- Portugal
- UCIBIO, Faculty of Science and Technology
- University NOVA of Lisbon
- Portugal
| | - Gil Fraqueza
- ISE, University of Algarve
- 8005-139 Faro
- Portugal
- CCMar, University of Algarve
- 8005-139 Faro
| | - Ricardo Lagoa
- ESTG, Polytechnic Institute of Leiria
- Portugal
- UCIBIO, Faculty of Science and Technology
- University NOVA of Lisbon
- Portugal
| | | | - Sib Sankar Mal
- Department of Chemistry
- National Institute of Technology Karnataka
- Mangalore 575025
- India
| | - Manuel Aureliano
- CCMar, University of Algarve
- 8005-139 Faro
- Portugal
- FCT
- University of Algarve
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19
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Dugar S, Izarova NV, Mal SS, Fu R, Joo HC, Lee U, Dalal NS, Pope MT, Jameson GB, Kortz U. Characterization of PtIV-containing polyoxometalates by high-resolution solid-state 195Pt and 51V NMR spectroscopy. NEW J CHEM 2016. [DOI: 10.1039/c5nj01242b] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [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
High-resolution solid-state 195Pt MAS NMR spectroscopy is a powerful technique for the characterization of PtIV-containing polyoxometalates, as is demonstrated for several examples.
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Affiliation(s)
- Sneha Dugar
- Department of Chemistry and Biochemistry
- Florida State University and National High Magnetic Field Laboratory
- Tallahassee
- USA
| | - Natalya V. Izarova
- Jacobs University
- Department of Life Sciences and Chemistry
- 28725 Bremen
- Germany
| | - Sib Sankar Mal
- Jacobs University
- Department of Life Sciences and Chemistry
- 28725 Bremen
- Germany
| | - Riqiang Fu
- Department of Chemistry and Biochemistry
- Florida State University and National High Magnetic Field Laboratory
- Tallahassee
- USA
| | - Hea-Chung Joo
- Department of Chemistry
- Pukyong National University
- Pusan 608-737
- South Korea
| | - Uk Lee
- Department of Chemistry
- Pukyong National University
- Pusan 608-737
- South Korea
| | - Naresh S. Dalal
- Department of Chemistry and Biochemistry
- Florida State University and National High Magnetic Field Laboratory
- Tallahassee
- USA
| | | | - Geoffrey B. Jameson
- Institute of Fundamental Sciences
- Massey University
- Palmerston North 4442
- New Zealand
| | - Ulrich Kortz
- Jacobs University
- Department of Life Sciences and Chemistry
- 28725 Bremen
- Germany
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20
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Naseer R, Mal SS, Ibrahim M, Kortz U, Armstrong G, Laffir F, Dickinson C, Vagin M, McCormac T. Redox, surface and electrocatalytic properties of layer-by-layer films based upon Fe(III)-substituted crown polyoxometalate [P8W48O184Fe16(OH)28(H2O)4]20-. Electrochim Acta 2014. [DOI: 10.1016/j.electacta.2014.03.099] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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21
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Mal SS, Tröppner O, Ivanović-Burmazović I, Burger P. Tetraalkylphosphonium Decavanadates: Synthesis, Structures, and Solution Properties. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201201447] [Citation(s) in RCA: 11] [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: 11/08/2022]
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22
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Anwar N, Vagin M, Naseer R, Imar S, Ibrahim M, Mal SS, Kortz U, Laffir F, McCormac T. Redox switching of polyoxometalate-methylene blue-based layer-by-layer films. Langmuir 2012; 28:5480-5488. [PMID: 22356639 DOI: 10.1021/la3004068] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Iron-substituted crown-type polyoxometalate (POM) [P(8)W(48)O(184)Fe(16)(OH)(28)(H(2)O)(4)](20-) has been successfully immobilized onto glassy carbon electrode surfaces by means of the layer-by-layer (LBL) technique employing the cationic redox active dye, methylene blue (MB). The constructed multilayers exhibit pH-dependent redox activity for both the anionic POM and the cationic dye moieties, which is in good agreement with their solution behavior. The films have been characterized by alternating current impedance, atomic force microscopy, and X-ray photoelectron spectroscopy, whereby the nature of the outer layer within the assemblies was found to have an effect upon the film's behavior. Preliminary investigations show that the POM dye-based films show electrocatalytic ability toward the reduction of hydrogen peroxide, however, only when there is an outer anionic POM layer.
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Affiliation(s)
- Nargis Anwar
- Electrochemistry Research Group, Department of Applied Science, Dundalk Institute of Technology, Dublin Road, Dundalk, County Louth, Ireland
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23
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Carraro M, Nsouli N, Oelrich H, Sartorel A, Sorarù A, Mal SS, Scorrano G, Walder L, Kortz U, Bonchio M. Reactive ZrIV and HfIV Butterfly Peroxides on Polyoxometalate Surfaces: Bridging the Gap between Homogeneous and Heterogeneous Catalysis. Chemistry 2011; 17:8371-8. [DOI: 10.1002/chem.201003103] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2010] [Indexed: 11/08/2022]
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24
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Abstract
Mixtures containing ammonia-borane and sec-butylamine-borane remain liquid throughout the hydrogen release process that affords tri(N-sec-butyl)borazine and polyborazylene. Concentrated solutions with metal catalysts afford >5 wt% H(2) in 1 h at 80 °C and addition of (EMIM)EtSO(4) ionic liquid co-solvent eliminates competing formation of insoluble linear poly(aminoborane) (EMIM = 1-ethyl-3-methyl-imidazolium).
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Affiliation(s)
- Sib Sankar Mal
- Department of Chemistry and Center for Catalysis Research and Innovation, University of Ottawa, Ottawa, ON, K1N 6N5 Canada
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25
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Assran AS, Mal SS, Izarova NV, Banerjee A, Suchopar A, Sadakane M, Kortz U. Alpha and beta isomers of tetrahafnium(iv) containing decatungstosilicates, [Hf4(OH)6(CH3COO)2(x-SiW10O37)2]12− (x = α, β). Dalton Trans 2011; 40:2920-5. [DOI: 10.1039/c0dt01543a] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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26
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Ibrahim M, Mal SS, Bassil BS, Banerjee A, Kortz U. Yttrium(III)-Containing Tungstoantimonate(III) Stabilized by Tetrahedral WO42− Capping Unit, [{Y(α-SbW9O31(OH)2)(CH3COO)(H2O)}3(WO4)]17−. Inorg Chem 2010; 50:956-60. [DOI: 10.1021/ic102149c] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Masooma Ibrahim
- Jacobs University, School of Engineering and Science, P.O. Box 750 561, 28725 Bremen, Germany
| | - Sib Sankar Mal
- Jacobs University, School of Engineering and Science, P.O. Box 750 561, 28725 Bremen, Germany
| | - Bassem S. Bassil
- Jacobs University, School of Engineering and Science, P.O. Box 750 561, 28725 Bremen, Germany
| | - Abhishek Banerjee
- Jacobs University, School of Engineering and Science, P.O. Box 750 561, 28725 Bremen, Germany
| | - Ulrich Kortz
- Jacobs University, School of Engineering and Science, P.O. Box 750 561, 28725 Bremen, Germany
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27
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Hussain F, Degonda A, Sandriesser S, Fox T, Mal SS, Kortz U, Patzke GR. Yttrium containing head-on complexes of silico- and germanotungstate: Synthesis, structure and solution properties. Inorganica Chim Acta 2010. [DOI: 10.1016/j.ica.2010.07.053] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Al‐Kadamany G, Mal SS, Milev B, Donoeva BG, Maksimovskaya RI, Kholdeeva OA, Kortz U. Hexazirconium‐ and Hexahafnium‐Containing Tungstoarsenates(III) and Their Oxidation Catalysis Properties. Chemistry 2010; 16:11797-800. [DOI: 10.1002/chem.201000786] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Ghada Al‐Kadamany
- School of Engineering and Science, Jacobs University, 28725, Bremen (Germany), Fax: (+49) 421‐200‐3229
| | - Sib Sankar Mal
- School of Engineering and Science, Jacobs University, 28725, Bremen (Germany), Fax: (+49) 421‐200‐3229
- Current address: Center For Catalysis Research and Innovation, Department of Chemistry, University of Ottawa, 10 Marie Curie, K1N 6N5, ON (Canada)
| | - Borislav Milev
- School of Engineering and Science, Jacobs University, 28725, Bremen (Germany), Fax: (+49) 421‐200‐3229
| | - Baira G. Donoeva
- Boreskov Institute of Catalysis, Lavrentieva 5, Novosibirsk 630090 (Russia), Fax: (+7) 3833‐309573
| | - Raisa I. Maksimovskaya
- Boreskov Institute of Catalysis, Lavrentieva 5, Novosibirsk 630090 (Russia), Fax: (+7) 3833‐309573
| | - Oxana A. Kholdeeva
- Boreskov Institute of Catalysis, Lavrentieva 5, Novosibirsk 630090 (Russia), Fax: (+7) 3833‐309573
| | - Ulrich Kortz
- School of Engineering and Science, Jacobs University, 28725, Bremen (Germany), Fax: (+49) 421‐200‐3229
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Zhang J, Liu T, Mal SS, Kortz U. Unique Supramolecular Assembly of Wheel-Shaped Nanoscale Polyanions with a Hydrophobic Core. Eur J Inorg Chem 2010. [DOI: 10.1002/ejic.201000396] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [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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30
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Bassil BS, Ibrahim M, Mal SS, Suchopar A, Biboum RN, Keita B, Nadjo L, Nellutla S, van Tol J, Dalal NS, Kortz U. Cobalt, Manganese, Nickel, and Vanadium Derivatives of the Cyclic 48-Tungsto-8-Phosphate [H7P8W48O184]33−. Inorg Chem 2010; 49:4949-59. [DOI: 10.1021/ic100050r] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Bassem S. Bassil
- Jacobs University, School of Engineering and Science, P.O. Box 750 561, 28725 Bremen, Germany
| | - Masooma Ibrahim
- Jacobs University, School of Engineering and Science, P.O. Box 750 561, 28725 Bremen, Germany
| | - Sib Sankar Mal
- Jacobs University, School of Engineering and Science, P.O. Box 750 561, 28725 Bremen, Germany
| | - Andreas Suchopar
- Jacobs University, School of Engineering and Science, P.O. Box 750 561, 28725 Bremen, Germany
| | - Rosa Ngo Biboum
- Laboratoire de Chimie Physique, UMR 8000 CNRS, Université Paris-Sud 11, 91405 Orsay Cedex, France
| | - Bineta Keita
- Laboratoire de Chimie Physique, UMR 8000 CNRS, Université Paris-Sud 11, 91405 Orsay Cedex, France
| | - Louis Nadjo
- Laboratoire de Chimie Physique, UMR 8000 CNRS, Université Paris-Sud 11, 91405 Orsay Cedex, France
| | - Saritha Nellutla
- Department of Chemistry and Biochemistry, Florida State University and Center for Interdisciplinary Magnetic Resonance, National High Magnetic Field Laboratory, Tallahassee, Florida 32306−4390
| | - Johan van Tol
- Department of Chemistry and Biochemistry, Florida State University and Center for Interdisciplinary Magnetic Resonance, National High Magnetic Field Laboratory, Tallahassee, Florida 32306−4390
| | - Naresh S. Dalal
- Department of Chemistry and Biochemistry, Florida State University and Center for Interdisciplinary Magnetic Resonance, National High Magnetic Field Laboratory, Tallahassee, Florida 32306−4390
| | - Ulrich Kortz
- Jacobs University, School of Engineering and Science, P.O. Box 750 561, 28725 Bremen, Germany
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31
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Jahier C, Mal SS, Kortz U, Nlate S. Dendritic Zirconium-Peroxotungstosilicate Hybrids: Synthesis, Characterization, and Use as Recoverable and Reusable Sulfide Oxidation Catalysts. Eur J Inorg Chem 2010. [DOI: 10.1002/ejic.200901141] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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32
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Mal SS, Nsouli NH, Carraro M, Sartorel A, Scorrano G, Oelrich H, Walder L, Bonchio M, Kortz U. Peroxo-Zr/Hf-Containing Undecatungstosilicates and -Germanates. Inorg Chem 2009; 49:7-9. [DOI: 10.1021/ic902203p] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sib Sankar Mal
- School of Engineering and Science, Jacobs University, P.O. Box 750 561, 28725 Bremen, Germany
| | - Nadeen H. Nsouli
- School of Engineering and Science, Jacobs University, P.O. Box 750 561, 28725 Bremen, Germany
| | - Mauro Carraro
- Department of Chemical Sciences, ITM-CNR, University of Padova, Via Marzolo 1, 35131 Padova, Italy
| | - Andrea Sartorel
- Department of Chemical Sciences, ITM-CNR, University of Padova, Via Marzolo 1, 35131 Padova, Italy
| | - Gianfranco Scorrano
- Department of Chemical Sciences, ITM-CNR, University of Padova, Via Marzolo 1, 35131 Padova, Italy
| | - Holger Oelrich
- Institute of Chemistry, University of Osnabrück, Barbarastrasse 7, 49069 Osnabrück, Germany
| | - Lorenz Walder
- Institute of Chemistry, University of Osnabrück, Barbarastrasse 7, 49069 Osnabrück, Germany
| | - Marcella Bonchio
- Department of Chemical Sciences, ITM-CNR, University of Padova, Via Marzolo 1, 35131 Padova, Italy
| | - Ulrich Kortz
- School of Engineering and Science, Jacobs University, P.O. Box 750 561, 28725 Bremen, Germany
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Mal SS, Bassil BS, Ibrahim M, Nellutla S, van Tol J, Dalal NS, Fernández JA, López X, Poblet JM, Biboum RN, Keita B, Kortz U. Wheel-Shaped Cu20-Tungstophosphate [Cu20X(OH)24(H2O)12(P8W48O184)]25− Ion (X = Cl, Br, I) and the Role of the Halide Guest. Inorg Chem 2009; 48:11636-45. [DOI: 10.1021/ic901641f] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sib Sankar Mal
- School of Engineering and Science, Jacobs University, P.O. Box 750 561, 28725 Bremen, Germany
| | - Bassem S. Bassil
- School of Engineering and Science, Jacobs University, P.O. Box 750 561, 28725 Bremen, Germany
| | - Masooma Ibrahim
- School of Engineering and Science, Jacobs University, P.O. Box 750 561, 28725 Bremen, Germany
| | - Saritha Nellutla
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306
| | - Johan van Tol
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306
- Center for Interdisciplinary Magnetic Resonance, National High Magnetic Field Laboratory, Tallahassee, Florida 32310
| | - Naresh S. Dalal
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306
- Center for Interdisciplinary Magnetic Resonance, National High Magnetic Field Laboratory, Tallahassee, Florida 32310
| | - Jorge A. Fernández
- Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, Imperial Tàrraco 1, 43005 Tarragona, Spain
| | - Xavier López
- Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, Imperial Tàrraco 1, 43005 Tarragona, Spain
| | - Josep M. Poblet
- Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, Imperial Tàrraco 1, 43005 Tarragona, Spain
| | - Rosa Ngo Biboum
- Laboratoire de Chimie Physique, Groupe d’Electrochimie et de Photoélectrochimie, UMR 8000, CNRS, Université Paris-Sud, Bâtiment 350, 91405 Orsay cedex, France
| | - Bineta Keita
- Laboratoire de Chimie Physique, Groupe d’Electrochimie et de Photoélectrochimie, UMR 8000, CNRS, Université Paris-Sud, Bâtiment 350, 91405 Orsay cedex, France
| | - Ulrich Kortz
- School of Engineering and Science, Jacobs University, P.O. Box 750 561, 28725 Bremen, Germany
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Bao YY, Bi LH, Wu LX, Mal SS, Kortz U. Preparation and characterization of Langmuir-Blodgett films of wheel-shaped Cu-20 tungstophosphate and DODA by two different strategies. Langmuir 2009; 25:13000-13006. [PMID: 19899818 DOI: 10.1021/la901854e] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A novel surfactant-encapsulated organic-inorganic hybrid compound (DODA)(24)Li[Cu(20)Cl(OH)(24)(P(8)W(48)O(184))] x 18 H(2)O (DODA-Cu20) has been prepared from the wheel-shaped tungstophosphate salt K(12)Li(13)[Cu(20)Cl(OH)(24)(H(2)O)(12)(P(8)W(48)O(184))] x 22 H(2)O (Cu20) and dimethyldioctadecylammonium bromide (DODA), and it has been characterized by elemental analysis (EA), thermogravimetric analysis (TGA), (1)H NMR, Fourier transform infrared spectroscopy (FT-IR), and X-ray diffraction (XRD) measurements. Monolayer and multilayer films of DODA-Cu20 were fabricated on different substrates by the Langmuir-Blodgett (LB) technique using H(2)O as the subphase. Another type of organic-inorganic hybrid film, DODA/Cu20, was also deposited on the same substrates as used for the film containing DODA-Cu20 under the same conditions by the LB technique using a Cu20 aqueous solution as the subphase and DODA as the cationic amphiphile for comparison. Both thus-prepared organic-inorganic hybrid films were characterized by UV-vis spectroscopy, XRD, transmission and polarized FT-IR spectroscopy, X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM). The results indicate that stable monolayers at the air-water interface for DODA-Cu20 and at the air-Cu20 solution interface for DODA can be formed and that two LB films containing DODA-Cu20 and DODA/Cu20 constructed by two different methods both exhibit well-ordered lamellar structures. It is proposed that Cu20 exhibits different packing modes in the two LB films depending on the deposition strategy used.
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Affiliation(s)
- Ya-Yan Bao
- College of Chemistry, State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun 130012, People's Republic of China
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Chen L, Hu J, Mal SS, Kortz U, Jaensch H, Mathys G, Richards R. Heterogeneous Wheel-Shaped Cu20-Polyoxotungstate [Cu20Cl(OH)24(H2O)12(P8W48O184)]25−Catalyst for Solvent-Free Aerobic Oxidation ofn-Hexadecane. Chemistry 2009; 15:7490-7. [DOI: 10.1002/chem.200900031] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Barsukova M, Dickman MH, Visser E, Sankar Mal S, Kortz U. Synthesis and Structural Characterization of the Yttrium Containing Isopolytungstate [YW10O36]9−. Z Anorg Allg Chem 2008. [DOI: 10.1002/zaac.200800240] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Al-Kadamany GA, Hussain F, Mal SS, Dickman MH, Leclerc-Laronze N, Marrot J, Cadot E, Kortz U. Cyclic Ti9 Keggin Trimers with Tetrahedral (PO4) or Octahedral (TiO6) Capping Groups. Inorg Chem 2008; 47:8574-6. [DOI: 10.1021/ic801114n] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ghada A. Al-Kadamany
- School of Engineering and Science, Jacobs University, P.O. Box 750561, 28725 Bremen, Germany, and Institut Lavoisier de Versailles, UMR 8180, Université de Versailles, 45 avenue des Etats Unis, 78035 Versailles, France
| | - Firasat Hussain
- School of Engineering and Science, Jacobs University, P.O. Box 750561, 28725 Bremen, Germany, and Institut Lavoisier de Versailles, UMR 8180, Université de Versailles, 45 avenue des Etats Unis, 78035 Versailles, France
| | - Sib Sankar Mal
- School of Engineering and Science, Jacobs University, P.O. Box 750561, 28725 Bremen, Germany, and Institut Lavoisier de Versailles, UMR 8180, Université de Versailles, 45 avenue des Etats Unis, 78035 Versailles, France
| | - Michael H. Dickman
- School of Engineering and Science, Jacobs University, P.O. Box 750561, 28725 Bremen, Germany, and Institut Lavoisier de Versailles, UMR 8180, Université de Versailles, 45 avenue des Etats Unis, 78035 Versailles, France
| | - Nathalie Leclerc-Laronze
- School of Engineering and Science, Jacobs University, P.O. Box 750561, 28725 Bremen, Germany, and Institut Lavoisier de Versailles, UMR 8180, Université de Versailles, 45 avenue des Etats Unis, 78035 Versailles, France
| | - Jérôme Marrot
- School of Engineering and Science, Jacobs University, P.O. Box 750561, 28725 Bremen, Germany, and Institut Lavoisier de Versailles, UMR 8180, Université de Versailles, 45 avenue des Etats Unis, 78035 Versailles, France
| | - Emmanuel Cadot
- School of Engineering and Science, Jacobs University, P.O. Box 750561, 28725 Bremen, Germany, and Institut Lavoisier de Versailles, UMR 8180, Université de Versailles, 45 avenue des Etats Unis, 78035 Versailles, France
| | - Ulrich Kortz
- School of Engineering and Science, Jacobs University, P.O. Box 750561, 28725 Bremen, Germany, and Institut Lavoisier de Versailles, UMR 8180, Université de Versailles, 45 avenue des Etats Unis, 78035 Versailles, France
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Bassil BS, Mal SS, Dickman MH, Kortz U, Oelrich H, Walder L. 6-Peroxo-6-Zirconium Crown and Its Hafnium Analogue Embedded in a Triangular Polyanion: [M6(O2)6(OH)6(γ-SiW10O36)3]18− (M = Zr, Hf). J Am Chem Soc 2008; 130:6696-7. [DOI: 10.1021/ja801424q] [Citation(s) in RCA: 123] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Bassem S. Bassil
- School of Engineering and Science, Jacobs University, P.O. Box 750561, 28725 Bremen, Germany, and Institute of Chemistry, University of Osnabrück, Barbarastrasse 7, 49069 Osnabrück, Germany
| | - Sib Sankar Mal
- School of Engineering and Science, Jacobs University, P.O. Box 750561, 28725 Bremen, Germany, and Institute of Chemistry, University of Osnabrück, Barbarastrasse 7, 49069 Osnabrück, Germany
| | - Michael H. Dickman
- School of Engineering and Science, Jacobs University, P.O. Box 750561, 28725 Bremen, Germany, and Institute of Chemistry, University of Osnabrück, Barbarastrasse 7, 49069 Osnabrück, Germany
| | - Ulrich Kortz
- School of Engineering and Science, Jacobs University, P.O. Box 750561, 28725 Bremen, Germany, and Institute of Chemistry, University of Osnabrück, Barbarastrasse 7, 49069 Osnabrück, Germany
| | - Holger Oelrich
- School of Engineering and Science, Jacobs University, P.O. Box 750561, 28725 Bremen, Germany, and Institute of Chemistry, University of Osnabrück, Barbarastrasse 7, 49069 Osnabrück, Germany
| | - Lorenz Walder
- School of Engineering and Science, Jacobs University, P.O. Box 750561, 28725 Bremen, Germany, and Institute of Chemistry, University of Osnabrück, Barbarastrasse 7, 49069 Osnabrück, Germany
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Lee U, Joo HC, Park KM, Mal SS, Kortz U, Keita B, Nadjo L. Facile Incorporation of Platinum(IV) into Polyoxometalate Frameworks: Preparation of [H2PtIVV9O28]5− and Characterization by195Pt NMR Spectroscopy. Angew Chem Int Ed Engl 2008; 47:793-6. [PMID: 18098259 DOI: 10.1002/anie.200703082] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Uk Lee
- Department of Chemistry, Pukyong National University, 599-1 Daeyeon-3dong, Nam-ku, Busan 608-737, South Korea.
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Nsouli NH, Mal SS, Dickman MH, Kortz U, Keita B, Nadjo L, Clemente-Juan JM. Two Iron-Containing Tungstogermanates: [K(H2O)(β-Fe2GeW10O37(OH))(γ-GeW10O36)]12- and [{β-Fe2GeW10O37(OH)2}2]12-. Inorg Chem 2007; 46:8763-70. [PMID: 17887749 DOI: 10.1021/ic701084x] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Interaction of the dilacunary polyanion precursor [gamma-GeW(10)O(36)](8-) with Fe(3+) ions in aqueous buffer medium (pH 4.8) results in the formation of two dimeric tungstogermanates depending on the reactant ratios. When using an Fe3+ to [gamma-GeW(10)O(36)](8-) ratio of 1:1, the asymmetric anion [K(H(2)O)(beta-Fe(2)GeW(10)O(37)(OH))(gamma-GeW(10)O(36))](12-) (1) is formed, whereas [{beta-Fe(2)GeW(10)O(37)(OH)2}2]12- (2) is formed when using a ratio of 2:1. Single-crystal X-ray analyses were carried out on Cs(3)K(9)[K(H(2)O)(beta-Fe(2)GeW(10)O(37)(OH))(gamma-GeW(10)O(36))].19H(2)O (CsK-1), which crystallizes in the triclinic system, space group P1, a = 11.4547(2), b = 19.9181(5), c = 21.0781(6) A, alpha = 66.7977(12), beta = 89.1061(12), gamma = 84.4457(11) degrees, and Z = 2 and on Cs(7)K(4)Na[{beta-Fe(2)GeW(10)O(37)(OH)(2)}(2)].39H(2)O (CsKNa-2), which crystallizes in the monoclinic system, space group C2/m, a = 32.7569(13), b = 12.2631(5), c = 14.2895(5) A, beta = 104.135(2) degrees , and Z = 2. Polyanion 1 consists of (beta-Fe(2)GeW(10)O(37)) and (gamma-GeW(10)O(36)) units linked via two Fe-O-W bridges and a central potassium ion. Two equivalent FeO(6) octahedra complete the belt of the beta-Keggin unit and link to the (gamma-GeW(10)O(36)) fragment. On the other hand, 2 consists of two {beta-Fe(2)GeW(10)O(37)(OH)(2)} units with four bridging hydroxo groups linking the four Fe(3+) ions, forming an eight-membered ring. The magnetic properties of CsK-1 and CsKNa-2 have been studied by magnetic susceptibility and magnetization measurements and fitted according to an isotropic exchange model. Both polyanions 1 and 2 exhibit diamagnetic ground states with a small amount of paramagnetic impurity. Electrochemistry studies on 1 and 2 were carried out in a pH 5 acetate medium. The two polyanions have in common the simultaneous reduction of all of their Fe(3+) centers. This observation suggests the existence of identical or almost-identical influences on these centers and their equivalence, especially in the reduced state. Controlled potential coulometry results indicate the presence of two Fe(3+) centers in 1 and four in 2. The splitting of the tungsten wave of 1 compared to the single tungsten wave of 2 is attributed to a difference in acid-base properties of the polyanions. Voltammetric peak-potential shifts as a function of pH were studied in the case of 2.
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Affiliation(s)
- Nadeen H Nsouli
- Jacobs University Bremen, School of Engineering and Science, P.O. Box 750 561, 28725 Bremen, Germany
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Liu G, Liu T, Mal SS, Kortz U. Wheel-Shaped Polyoxotungstate [Cu20Cl(OH)24(H2O)12-(P8W48O184)]25- Macroanions Form Supramolecular “Blackberry” Structure in Aqueous Solution [J. Am. Chem. Soc. 2006, 128, 10103−10110]. J Am Chem Soc 2007. [DOI: 10.1021/ja069317a] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Mal SS, Nsouli NH, Dickman MH, Kortz U. Organoruthenium derivative of the cyclic [H7P8W48O184]33? anion: [{K(H2O)}3{Ru(p-cymene)(H2O)}4P8W49O186(H2O)2]27? Dalton Trans 2007:2627-30. [PMID: 17576486 DOI: 10.1039/b706762n] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Reaction of [Ru(p-cymene)Cl2]2 with [H7P8W48O184]33- (P8W48) in aqueous acidic medium results in the organometallic derivative [{K(H2O)}3{Ru(p-cymene)(H2O)}4P8W49O186(H2O)2]27- (1); in addition to the four {Ru(p-cymene)(H2O)} units, an unusual WO6 group with four equatorial, terminal ligands is also grafted to the crown-shaped P8W48 precursor.
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Affiliation(s)
- Sib Sankar Mal
- Jacobs University Bremen, School of Engineering and Science, 28725 Bremen, Germany
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Liu G, Liu T, Mal SS, Kortz U. Wheel-Shaped Polyoxotungstate [Cu20Cl(OH)24(H2O)12(P8W48O184)]25- Macroanions Form Supramolecular “Blackberry” Structure in Aqueous Solution. J Am Chem Soc 2006; 128:10103-10. [PMID: 16881639 DOI: 10.1021/ja0610840] [Citation(s) in RCA: 136] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The hydrophilic polyoxotungstate [Cu20Cl(OH)24(H2O)12(P8W48O184)]25- ({Cu20P8W48}) self-assembles into single-layer, hollow, spherical "blackberry"-type structures in aqueous solutions, as studied by dynamic light scattering (DLS), static light scattering (SLS), zeta potential analysis, and scanning electron microscopy (SEM) techniques. This represents the first report of blackberry formation for a non-Mo-containing polyoxometalate. There is no obvious change in the shape and size of the blackberries during the slow blackberry formation process, neither with macroionic concentration nor with temperature. Our results suggest that the blackberry-type structure formation is most likely a general phenomenon for hydrophilic macroions with suitable size and charge in a polar solvent, and not a specific property of polyoxomolybdates and their derivatives. The {Cu20P8W48} macroions are thus far the smallest type of macroions to date (equivalent radius < 2 nm) showing the unique self-assembly behavior, helping us to move one step closer toward identifying the transition point from simple ions (can be described by the Debye-Hückel theory) to macroions in very dilute solutions. Moreover, by using {Cu20P8W48} blackberry-type structures as the model system, the electrophoretic properties of macroionic supramolecular structures are studied for the first time via zeta-potential analysis. The mobility of blackberry-type structures is determined and used for understanding the state of small cations in solution. We notice that the average charge density on each {Cu20P8W48} macroanion in a blackberry is much lower than that of discrete "free" {Cu20P8W48} macroions. This result suggests that some small alkali counterions are closely associated with, or even incorporated into, the blackberry-type structures and thus do not contribute to solution conductivity. This model is fully consistent with our speculation that monovalent counterions play an important role in the self-assembly of macroions, possibly providing an attractive force contributing to blackberry formation.
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Affiliation(s)
- Guang Liu
- Department of Chemistry, Lehigh University, Bethlehem, Pennsylvania 18015, USA
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Alam MS, Dremov V, Müller P, Postnikov AV, Mal SS, Hussain F, Kortz U. STM/STS Observation of Polyoxoanions on HOPG Surfaces: the Wheel-Shaped [Cu20Cl(OH)24(H2O)12(P8W48O184)]25- and the Ball-Shaped [{Sn(CH3)2(H2O)}24{Sn(CH3)2}12(A-PW9O34)12]36-. Inorg Chem 2006; 45:2866-72. [PMID: 16562942 DOI: 10.1021/ic051586z] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A combination of scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS) techniques have been performed on the wheel-shaped [Cu20Cl(OH)24(H2O)12(P8W48O184)]25- and the ball-shaped [{Sn(CH3)2(H2O)}24{Sn(CH3)2}12(A-PW9O34)12]36- deposited on highly oriented pyrolytic graphite surfaces. Small, regular molecule clusters, as well as separated single molecules, were observed. The size of the molecules is in agreement with the data determined by X-ray crystallography. In STS measurements, we found a rather large contrast at the expected location of the Cu metal centers in our molecules, i.e., the location of the individual Cu ions in their organic matrix is directly addressable by STS.
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Affiliation(s)
- Mohammad S Alam
- Physikalisches Institut III, Universität Erlangen-Nürnberg, Erwin-Rommel-Strasse 1, 91058 Erlangen, Paul Verlaine University - LPMD/IPC, 1 Bd. Arago, F-57078 Metz, France
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Affiliation(s)
- Sib Sankar Mal
- International University Bremen, School of Engineering and Science, P.O. Box 750 561, 28725 Bremen, Germany
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