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Nayak S, Bhattacharya S, Roy P, Bhakta V, Bhattacharya S. Supramolecular interaction of PCBM with porphyrins in solution: Photophysical insights. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2024; 305:123476. [PMID: 37827003 DOI: 10.1016/j.saa.2023.123476] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Revised: 09/23/2023] [Accepted: 09/29/2023] [Indexed: 10/14/2023]
Abstract
This work reports the self-assembly between [6,6]-phenyl C71 butyric acid methyl ester (PCBM) and 2,3,7,8,12,13,17,18-octaethyl-21H,23H porphyrin (1)(and/2,3,7,8,12,13,17,18-octaethyl-21H,23H porphyrin Zn(II) (2) in toluene. Ground state intermolecular interaction is evidenced from absorption spectrophotometric measurements. New absorption bands are observed in the visible region which may be identified due to charge transfer (CT). Several important physicochemical factors are enumerated for PCBM-1 and PCBM-2 systems. Fluorescence investigations elicit complex formation of PCBM with porphyrins (with both 1 and 2) and reveal considerable magnitude of binding constant (K) for PCBM-2 system, i.e., KPCBM-2 = 80,435 dm3⋅mol-1 compared to PCBM-1 system, i.e., KPCM-1 = 12,600 dm3·mol-1 as well as highly ratio of selectivity in binding (KPCBM-2/KPCBM-1 ∼ 6.4). Time resolved fluorescence experiments reveal that photoexcited decay from the excited singlet state of porphyrins (i.e., 1* and 2*) by PCBM is statically controlled compared to dynamic path. Magnitude of solvent reorganization energy indicates possibility of faster charge recombination in case of PCBM-2 system. Both 1H and 13C NMR measurements provide substantial support behind complexation of PCBM with porphyrins (both 1 and 2) in solution. Ab initio calculations in vacuo support the trend in K for PCBM-1 and PCBM-2 systems and establish the proper orientation of PCBM towards 1 (and/ 2) during complexation. Transient absorption measurements establish two different mode of energy transfer pathway from porphyrin to PCBM in toluene.
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Affiliation(s)
- Subrata Nayak
- Physical Research Laboratory-2, Chemistry Department, The University of Burdwan, Golapbag, Purba Bardhaman, West Bengal 713 104, India
| | - Shalmali Bhattacharya
- Department of Computer Science & Engineering, Academy of Technology, Adisaptagram, Hooghly 712 502, India
| | - Pialee Roy
- Department of Chemistry, Guskara Mahavidyalaya, Guskara, West Bengal 713 128, India
| | - Viki Bhakta
- Department of Chemistry, Rajabazar Science College, University of Calcutta, 92, Acharya Prafulla Chandra Road, Kolkata, West Bengal 700009, India
| | - Sumanta Bhattacharya
- Physical Research Laboratory-2, Chemistry Department, The University of Burdwan, Golapbag, Purba Bardhaman, West Bengal 713 104, India.
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The Interaction and Thermodynamic Studies on the Binding of Congo Red Dye with Collagen Protein by Polarographic and Equilibrium Dialysis Techniques. Z PHYS CHEM 2018. [DOI: 10.1515/zpch-2018-1181] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The survey of the existing literature revealed that the binding of Molybdenum, Vanadium, Zinc, Cadmium, Copper, Nickel and Cobalt with the protein is well known but no binding studies of Congo red molecules with collagen are reported. With a view to extend the existed knowledge of ecological nature of dye-protein system, it was thought of interest to investigate of properties of dye-protein mixture. The binding of Congo red dye has been studied with collagen protein using polarographic and equilibrium dialysis techniques. The intrinsic association constants and the number of binding sites have been calculated from Scatchard plots. The effect of pH on these constants was studied at pH 5.57, 7.50, 9.50 by polarographic technique and it was found that these values were decreased with increasing pH. The effect of pH was found to be similar by equilibrium dialysis technique. The values of different thermodynamic parameters have been reported. The free energies of aggregation, ΔG associated with the binding interaction of the dyes and protein were calculated. The negative values of the ΔG confirm the feasibility of interaction between the dye and protein.
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Vellaiswamy G, Ramaswamy S. Co(II) Complexes of4-((3-ethoxy-2-hydroxybenzylidene)amino)-N-(thiazol-2-yl)benzenesulphonamide and 4-((pyridin-2-ylmethylene)amino)-N-(thiazol-2-tl)benzenesulfonamide: Synthesis, Fluorescence Properties and Anticancer Activity. J Fluoresc 2017; 27:1559-1565. [PMID: 28447182 DOI: 10.1007/s10895-017-2096-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Accepted: 04/04/2017] [Indexed: 11/24/2022]
Abstract
Two new Co(II) complexes of 4-((3-ethoxy-2-hydroxybenzylidene)amino)-N-(thiazol-2-yl)benzenesulphonamide and 4-((pyridin-2-ylmethylene)amino)-N-(thiazol-2-yl)benzene sulfonamide were synthesised. The structure of the complexes was identified by elemental analysis, FT-IR, electronic, EI mass, Powder XRD spectra and magnetic moment. The TG and DTA patterns of the complexes were supported the structures. The fluorescence quenching of these complexes with alizarin dye were premeditated and the free energy change (∆Get) for electron transfer process was designed by Rehm-Weller equation. The [Co(L1-H)2(H2O)2] and [Co(L2)2(H2O)2].2H2O were submitted for in vitro cytotoxicity studies in human breast cancer cell line (MCF 7).
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Affiliation(s)
- Gomathi Vellaiswamy
- PG and Research Department of Chemistry, Seethalakshmi Ramaswami College, Tiruchirappalli, Tamil Nadu, 620 002, India.
| | - Selvameena Ramaswamy
- PG and Research Department of Chemistry, Seethalakshmi Ramaswami College, Tiruchirappalli, Tamil Nadu, 620 002, India
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Mongwaketsi NP, Kotsedi L, Nuru ZY, Sparrow R, Garab G, Maaza M. Porphyrin nanorods-polymer composites for solar radiation harvesting applications. J PORPHYR PHTHALOCYA 2015. [DOI: 10.1142/s1088424614500941] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The interest in exploring porphyrin-based nanostructures for artificial solar radiation harvesting stems from their structural similarity to chlorophylls. In nature, the precise organization and orientation of the chlorophylls result in efficient absorption of light energy. Inspired by these naturally occurring architectures relevant optical studies including the dynamics of intermolecular and intra-molecular processes of the porphyrin nanorods were investigated. The design of artificial light harvesting systems requires several key factors, such as absorption in the UV-visible and near-infrared wavelengths, energy transfer ability and the selection of light absorbing pigments. Another key factor is the organizational structure through which the components will interact. We attempted to accomplish this by incorporating porphyrin nanorods into polymer matrices and this will also aid in achieving an arrangement where they can be directly used as devices. The nanorods were embedded in a polymeric matrix, using latex technology and electrospinning which gave the possibility of investigating the orientation of nanorods in the polymer. Spectroscopic and microscopic studies were conducted to investigate the optical and morphological properties of the porphyrin nanorods-polymer composites for applications in artificial solar radiation harvesting systems.
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Affiliation(s)
- Nametso P. Mongwaketsi
- iThemba LABS, Materials Research Department, National Research Foundation, P. O. Box 722 Somerset West 7129, South Africa
| | - Lebogang Kotsedi
- iThemba LABS, Materials Research Department, National Research Foundation, P. O. Box 722 Somerset West 7129, South Africa
- UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology, College of Graduate Studies, University of South Africa, Muckleneuk Ridge, P. O. Box 392, Pretoria 0001, South Africa
| | - Zebib Y. Nuru
- iThemba LABS, Materials Research Department, National Research Foundation, P. O. Box 722 Somerset West 7129, South Africa
- UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology, College of Graduate Studies, University of South Africa, Muckleneuk Ridge, P. O. Box 392, Pretoria 0001, South Africa
| | - Raymond Sparrow
- Council for Scientific & Industrial Research, Biosciences, P. O. Box 395, Pretoria 0001, South Africa
| | - Gyozo Garab
- Institute of Plant Biology, Biological Research Center, P. O. Box 521, Szeged H-6701, Hungary
| | - Malik Maaza
- iThemba LABS, Materials Research Department, National Research Foundation, P. O. Box 722 Somerset West 7129, South Africa
- UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology, College of Graduate Studies, University of South Africa, Muckleneuk Ridge, P. O. Box 392, Pretoria 0001, South Africa
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Highly sensitive fluorescence biosensors for sparfloxacin detection at nanogram level based on electron transfer mechanism of cadmium telluride quantum dots. Biotechnol Lett 2015; 37:1057-61. [DOI: 10.1007/s10529-015-1767-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2014] [Accepted: 01/07/2015] [Indexed: 10/24/2022]
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Tan X, Liu S, Shen Y, He Y, Yang J. Quantum dots (QDs) based fluorescence probe for the sensitive determination of kaempferol. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 133:66-72. [PMID: 24929317 DOI: 10.1016/j.saa.2014.05.032] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2014] [Revised: 05/09/2014] [Accepted: 05/14/2014] [Indexed: 05/09/2023]
Abstract
In this work, using the quenching of fluorescence of thioglycollic acid (TGA)-capped CdTe quantum dots (QDs), a novel method for the determination of kaempferol (KAE) has been developed. Under optimum conditions, a linear calibration plot of the quenched fluorescence intensity at 552nm against the concentration of KAE was observed in the range of 4-44μgmL(-1) with a detection limit (3σ/K) of 0.79μgmL(-1). In addition, the detailed reaction mechanism has also been proposed on the basis of electron transfer supported by ultraviolet-visible (UV-vis) absorption and fluorescence (FL) spectroscopy. The method has been applied for the determination of KAE in pharmaceutical preparations with satisfactory results. The proposed method manifested several advantages such as high sensitivity, short analysis time, low cost and ease of operation.
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Affiliation(s)
- Xuanping Tan
- School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
| | - Shaopu Liu
- School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
| | - Yizhong Shen
- School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
| | - Youqiu He
- School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
| | - Jidong Yang
- School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China; School of Chemistry and Environmental Engineering, Chongqing Three Gorges University, Chongqing, Wanzhou 404000, China.
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Shen Y, Liu S, He Y. Fluorescence quenching investigation on the interaction of glutathione-CdTe/CdS quantum dots with sanguinarine and its analytical application. LUMINESCENCE 2013; 29:176-82. [PMID: 23640753 DOI: 10.1002/bio.2525] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2012] [Revised: 03/10/2013] [Accepted: 03/24/2013] [Indexed: 11/05/2022]
Abstract
Water-soluble glutathione (GSH)-capped core/shell CdTe/CdS quantum dots (QDs) were synthesized. In pH5.4 sodium phosphate buffer medium, the interaction between GSH-CdTe/CdS QDs and sanguinarine (SA) was investigated by spectroscopic methods, including fluorescence spectroscopy and ultraviolet-visible absorption spectroscopy. Addition of SA to GSH-CdTe/CdS QDs results in fluorescence quenching of GSH-CdTe/CdS QDs. Quenching intensity was in proportion to the concentration of SA in a certain range. Investigation of the quenching mechanism, proved that the fluorescence quenching of GSH-CdTe/CdS QDs by SA is a result of electron transfer. Based on the quenching of the fluorescence of GSH-CdTe/CdS QDs by SA, a novel, simple, rapid and specific method for SA determination was proposed. The detection limit for SA was 3.4 ng/mL and the quantitative determination range was 0.2-40.0 µg/mL with a correlation coefficient of 0.9988. The method has been applied to the determination of SA in synthetic samples and fresh urine samples of healthy human with satisfactory results.
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Affiliation(s)
- Yizhong Shen
- School of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, People's Republic of China
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Asha Jhonsi M, Kathiravan A, Paramaguru G, Manivannan C, Renganathan R. Fluorescence Quenching of Tris(2,2′-bipyridine)Ruthenium(II) Dichloride by Certain Organic Dyes. J SOLUTION CHEM 2010. [DOI: 10.1007/s10953-010-9594-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Kathiravan A, Renganathan R. Fluorescence Quenching of Phycoerythrin by Anthraquinone Dyes. Z PHYS CHEM 2010. [DOI: 10.1524/zpch.2010.5518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Abstract
Fluorescence quenching of phycoerythrin (PE) by a series of anthraquinone dyes has been investigated using steady state fluorescence technique in water medium. The dyes used were Uniblue, Acid blue 129, Alizarin and Alizarin red S. The quenching of PE was found to obey the Stern-Volmer equation and the corresponding Stern-Volmer plots were linear indicating the dynamic quenching. The quenching rate constants (k
q) were calculated by using fluorescence data. The mechanism of quenching is discussed on the basis of quenching rate constants as well as the reduction potential of dyes. The electron transfer mechanism has been proved by the calculation of free energy change (ΔGet) by applying Rehm-Weller equation.
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