51
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Kianfar AH, Tavanapour S, Eskandari K, Azarian MH, Mahmood WAK, Bagheri M. Experimental and theoretical structural determination, spectroscopy and electrochemistry of cobalt (III) Schiff base complexes: immobilization of complexes onto Montmorillonite-K10 nanoclay. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2017. [DOI: 10.1007/s13738-017-1238-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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52
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Afonso MBA, Cruz TR, Silva YF, Pereira JCA, Machado AE, Goi BE, Lima-Neto BS, Carvalho-Jr VP. Ruthenium(II) complexes of Schiff base derived from cycloalkylamines as pre-catalysts for ROMP of norbornene and ATRP of methyl methacrylate. J Organomet Chem 2017. [DOI: 10.1016/j.jorganchem.2017.09.043] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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53
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Ganji N, Chityala VK, Marri PK, Aveli R, Narendrula V, Daravath S, Shivaraj. DNA incision evaluation, binding investigation and biocidal screening of Cu(II), Ni(II) and Co(II) complexes with isoxazole Schiff bases. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2017; 175:132-140. [DOI: 10.1016/j.jphotobiol.2017.08.038] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2017] [Revised: 08/21/2017] [Accepted: 08/26/2017] [Indexed: 01/24/2023]
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54
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Gupta SK, Sen N, Ganaie JA, Butcher RJ, Jasinski JP. Unusual coordination of mononuclear cobalt(III) complexes with sterically demanding Schiff bases: synthesis, spectroscopy, electrochemistry, crystallography, DNA binding, and theoretical investigation. J COORD CHEM 2017. [DOI: 10.1080/00958972.2017.1380196] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Sushil K. Gupta
- School of Studies in Chemistry, Jiwaji University, Gwalior, India
| | - Neha Sen
- School of Studies in Chemistry, Jiwaji University, Gwalior, India
| | - Javeed A. Ganaie
- School of Studies in Chemistry, Jiwaji University, Gwalior, India
| | - Ray J. Butcher
- Department of Chemistry, Howard University, Washington, DC, USA
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55
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Daravath S, Kumar MP, Rambabu A, Vamsikrishna N, Ganji N, Shivaraj. Design, synthesis, spectral characterization, DNA interaction and biological activity studies of copper(II), cobalt(II) and nickel(II) complexes of 6-amino benzothiazole derivatives. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.05.022] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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56
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Kumar S, Hansda A, Chandra A, Kumar A, Kumar M, Sithambaresan M, Faizi MSH, Kumar V, John RP. Co(II), Ni(II), Cu(II) and Zn(II) complexes of acenaphthoquinone 3-(4-benzylpiperidyl)thiosemicarbazone: Synthesis, structural, electrochemical and antibacterial studies. Polyhedron 2017. [DOI: 10.1016/j.poly.2017.05.055] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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57
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King AP, Gellineau HA, Ahn JE, MacMillan SN, Wilson JJ. Bis(thiosemicarbazone) Complexes of Cobalt(III). Synthesis, Characterization, and Anticancer Potential. Inorg Chem 2017; 56:6609-6623. [PMID: 28509538 PMCID: PMC8113979 DOI: 10.1021/acs.inorgchem.7b00710] [Citation(s) in RCA: 68] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Nine bis(thiosemicarbazone) (BTSC) cobalt(III) complexes of the general formula [Co(BTSC)(L)2]NO3 were synthesized, where BTSC = diacetyl bis(thiosemicarbazone) (ATS), pyruvaldehyde bis(thiosemicarbazone) (PTS), or glyoxal bis(thiosemicarbazone) (GTS) and L = ammonia, imidazole (Im), or benzylamine (BnA). These compounds were characterized by multinuclear NMR spectroscopy, mass spectrometry, cyclic voltammetry, and X-ray crystallography. Their stability in phosphate-buffered saline was investigated and found to be highly dependent on the nature of the axial ligand, L. These studies revealed that complex stability is primarily dictated by the axial ligand following the sequence NH3 > Im > BnA. The cellular uptake and cytotoxicity in cancer cells were also determined. Both the cellular uptake and cytotoxicity were significantly affected by the nature of the equatorial BTSC. Complexes of ATS were taken up much more effectively than those of PTS and GTS. The cytotoxicity of the complexes was correlated to that of the free ligand. Cell uptake and cytotoxicity were also determined under hypoxic conditions. Only minor differences in the hypoxia activity and uptake were observed. Treatment of the cancer cells with the copper-depleting agent tetrathiomolybdate decreased the cytotoxic potency of the complexes, indicating that they may operate via a copper-dependent mechanism. These results provide a structure-activity relationship for this class of compounds, which may be applied for the rational design of new cobalt(III) anticancer agents.
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Affiliation(s)
- A. Paden King
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853, United States
| | - Hendryck A. Gellineau
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853, United States
| | - Jung-Eun Ahn
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853, United States
| | - Samantha N. MacMillan
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853, United States
| | - Justin J. Wilson
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853, United States
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58
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Galini M, Salehi M, Kubicki M, Amiri A, Khaleghian A. Structural characterization and electrochemical studies of Co(II), Zn(II), Ni(II) and Cu(II) Schiff base complexes derived from 2-((E)-(2-methoxyphenylimino)methyl)-4-bromophenol; Evaluation of antioxidant and antibacterial properties. Inorganica Chim Acta 2017. [DOI: 10.1016/j.ica.2017.02.001] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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59
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Ozdemir M, Sonmez M, Sen F, Dincer M, Ozdemir N. Synthesis of a new heterocyclic Schiff base ligand “(E)-5-benzoyl-4-phenyl-1-((pyridin-2-ylmethylene) amino) pyrimidin-2(1H)-one”: An experimental and computational modeling study. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2016.08.031] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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60
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Mahato M, Mondal D, Nayek HP. Syntheses, Structures and Phenoxazinone Synthase Activities of Two Cobalt(III) Complexes. ChemistrySelect 2016. [DOI: 10.1002/slct.201601597] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Mamata Mahato
- Department of Applied Chemistry; Indian Institute of Technology (ISM) Dhanbad, 826004; Jharkhand India
| | - Dipanjan Mondal
- Department of Applied Chemistry; Indian Institute of Technology (ISM) Dhanbad, 826004; Jharkhand India
| | - Hari Pada Nayek
- Department of Applied Chemistry; Indian Institute of Technology (ISM) Dhanbad, 826004; Jharkhand India
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61
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Kianfar AH, Sedighipoor M, Mohammadnezhad G, Görls H, Plass W, Roushani M. Synthesis, spectroscopy, electrochemistry and structural determination of asymmetric cobalt(III) Schiff base complexes. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2016. [DOI: 10.1007/s13738-016-0979-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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62
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Sharbatdaran M, Farzaneh F, Larijani MM, Salimi A, Ghiasi M, Ghandi M. Synthesis, characterization, DFT studies, and immobilization of cobalt(II) complex with N,N′,N″-tris(2-pyrimidinyl)dimethylentriamine on modified iron oxide as oxidation catalyst. Polyhedron 2016. [DOI: 10.1016/j.poly.2016.05.023] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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63
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Tsiliou S, Kefala LA, Hatzidimitriou AG, Kessissoglou DP, Perdih F, Papadopoulos AN, Turel I, Psomas G. Cobalt(II) complexes with non-steroidal anti-inflammatory drugs and α-diimines. J Inorg Biochem 2016; 160:125-39. [DOI: 10.1016/j.jinorgbio.2015.12.015] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2015] [Revised: 11/23/2015] [Accepted: 12/16/2015] [Indexed: 01/16/2023]
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64
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Yan J, Fan L, Qin JC, Li CR, Yang ZY. A novel and resumable Schiff-base fluorescent chemosensor for Zn(II). Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.05.079] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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65
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DNA Binding, Cleavage and Antibacterial Activity of Mononuclear Cu(II), Ni(II) and Co(II) Complexes Derived from Novel Benzothiazole Schiff Bases. J Fluoresc 2016; 26:1317-29. [DOI: 10.1007/s10895-016-1818-z] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2016] [Accepted: 04/26/2016] [Indexed: 12/28/2022]
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66
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Buchwald JR, Kal S, Civic MR, deJoode IM, Filatov AS, Dinolfo PH. Spin modulation and electrochemical behavior of a five-coordinate cobalt(III) salen complex. J COORD CHEM 2016. [DOI: 10.1080/00958972.2016.1175001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- James R. Buchwald
- Department of Chemistry and Chemical Biology, Rensselaer Polytechnic Institute, Troy, NY, USA
| | - Subhadeep Kal
- Department of Chemistry and Chemical Biology, Rensselaer Polytechnic Institute, Troy, NY, USA
| | - Marissa R. Civic
- Department of Chemistry and Chemical Biology, Rensselaer Polytechnic Institute, Troy, NY, USA
| | - Ian M. deJoode
- Department of Chemistry and Chemical Biology, Rensselaer Polytechnic Institute, Troy, NY, USA
| | - Alexander S. Filatov
- Department of Chemistry, University at Albany, State University of New York, Albany, NY, USA
- Department of Chemistry, University of Chicago, Chicago, IL, USA
| | - Peter H. Dinolfo
- Department of Chemistry and Chemical Biology, Rensselaer Polytechnic Institute, Troy, NY, USA
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67
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Lee JJ, Choi YW, You GR, Lee SY, Kim C. A phthalazine-based two-in-one chromogenic receptor for detecting Co(2+) and Cu(2+) in an aqueous environment. Dalton Trans 2016; 44:13305-14. [PMID: 26130313 DOI: 10.1039/c5dt00957j] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new multifunctional and highly selective chemosensor for Co(2+) and Cu(2+) was designed and synthesized. could simultaneously detect both Co(2+) and Cu(2+) by changing its color from pale yellow to pink and to orange in a near-perfect aqueous solution. The binding modes of to Co(2+) and Cu(2+) were determined to be a 2 : 1 complexation stoichiometry through Job's plot, ESI-mass spectrometry analysis and (1)H NMR titration. The detection limits (1.5 and 2.1 μM) of for Co(2+) and Cu(2+) were lower than the DEP guidelines (1.7 μM for Co(2+)) and the WHO guidelines (31.5 μM for Cu(2+)) for drinking water. The chemosensor could be used to quantify Co(2+) and Cu(2+) in water samples. Moreover, could be used as a practical, visible colorimetric test kit for both Co(2+) and Cu(2+). The sensing mechanisms of Co(2+) and Cu(2+) by were supported by theoretical calculations.
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Affiliation(s)
- Jae Jun Lee
- Department of Fine Chemistry and Department of Interdisciplinary Bio IT Materials, Seoul National University of Science and Technology, Seoul 139-743, Korea.
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68
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Sing N, Roy S, Guin PS, Mahali K, Majee P, Mondal SK, Mahata P, Sengupta PS, Mondal P. A Co(ii) complex of a vitamer of vitamin B6acts as a sensor for Hg2+and pH in aqueous media. NEW J CHEM 2016. [DOI: 10.1039/c6nj00410e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A new Co(ii) complex was prepared by template reaction, acting as a dual fluorescent sensor for Hg2+ions and pH in aqueous solution.
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Affiliation(s)
- Nilam Sing
- Department of Chemistry (UG & PG)
- Vivekananda Mahavidyalaya
- Burdwan-713103
- India
| | - Sanjay Roy
- Department of Chemistry
- Shibpur Dinobundhoo Institution (College)
- Howrah-711102
- India
| | - Partha Sarathi Guin
- Department of Chemistry
- Shibpur Dinobundhoo Institution (College)
- Howrah-711102
- India
| | | | - Prakash Majee
- Department of Chemistry
- Visva-Bharati
- Santiniketan-731235
- India
| | | | - Partha Mahata
- Department of Chemistry
- Suri Vidyasagar College
- Suri-731101
- India
| | | | - Palash Mondal
- Department of Chemistry (UG & PG)
- Vivekananda Mahavidyalaya
- Burdwan-713103
- India
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69
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Lee SY, Lee JJ, Bok KH, Kim SY, Kim C. Highly selective and sensitive colorimetric chemosensor for detection of Co2+ in a near-perfect aqueous solution. RSC Adv 2016. [DOI: 10.1039/c6ra03364d] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
An outstanding colorimetric chemosensor was developed to selectively detect Co2+ with the lowest detection limit through the color change from colorless to yellow.
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Affiliation(s)
- Seong Youl Lee
- Department of Fine Chemistry and Department of Interdisciplinary Bio IT Materials
- Seoul National University of Science and Technology
- Seoul 139-743
- Korea
| | - Jae Jun Lee
- Department of Fine Chemistry and Department of Interdisciplinary Bio IT Materials
- Seoul National University of Science and Technology
- Seoul 139-743
- Korea
| | - Kwon Hee Bok
- Department of Fine Chemistry and Department of Interdisciplinary Bio IT Materials
- Seoul National University of Science and Technology
- Seoul 139-743
- Korea
| | - So Young Kim
- Department of Fine Chemistry and Department of Interdisciplinary Bio IT Materials
- Seoul National University of Science and Technology
- Seoul 139-743
- Korea
| | - Cheal Kim
- Department of Fine Chemistry and Department of Interdisciplinary Bio IT Materials
- Seoul National University of Science and Technology
- Seoul 139-743
- Korea
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70
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Tsitsa I, Tarushi A, Doukoume P, Perdih F, de Almeida A, Papadopoulos A, Kalogiannis S, Casini A, Turel I, Psomas G. Structure and biological activities of metal complexes of flumequine. RSC Adv 2016. [DOI: 10.1039/c5ra25776j] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Co(ii)–flumequine complexes were characterized and their biological activity was evaluated in regard to DNA- and albumin-binding and antimicrobial and antiproliferative activity.
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71
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O'Neill ES, Kolanowski JL, Yin GH, Broadhouse KM, Grieve SM, Renfrew AK, Bonnitcha PD, New EJ. Reversible magnetogenic cobalt complexes. RSC Adv 2016. [DOI: 10.1039/c6ra04643f] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A cobalt tris(2-pyridylmethyl)amine complex cycles between stable paramagnetic Co(ii) and diamagnetic Co(iii) forms with corresponding changes in the MRI contrast.
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Affiliation(s)
- E. S. O'Neill
- School of Chemistry
- The University of Sydney
- Australia
| | | | - G. H. Yin
- School of Chemistry
- The University of Sydney
- Australia
| | - K. M. Broadhouse
- Heart Research Institute
- Newtown
- Australia
- Sydney Translational Imaging Laboratory
- Sydney Medical School
| | - S. M. Grieve
- The Kolling Institute
- The University of Sydney
- Australia
- Heart Research Institute
- Newtown
| | - A. K. Renfrew
- School of Chemistry
- The University of Sydney
- Australia
| | | | - E. J. New
- School of Chemistry
- The University of Sydney
- Australia
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72
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Mixed-ligand cobalt(II) complexes of bioinorganic and medicinal relevance, involving dehydroacetic acid and β-diketones: Their synthesis, hyphenated experimental-DFT, thermal and bactericidal facets. J Mol Struct 2015. [DOI: 10.1016/j.molstruc.2015.06.019] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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73
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Heffern MC, Reichova V, Coomes JL, Harney AS, Bajema EA, Meade TJ. Tuning cobalt(III) Schiff base complexes as activated protein inhibitors. Inorg Chem 2015; 54:9066-74. [PMID: 26331337 PMCID: PMC4638226 DOI: 10.1021/acs.inorgchem.5b01415] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Cobalt(III) Schiff base complexes ([Co(acacen)(L)2](+), where L = NH3) inhibit histidine-containing proteins through dissociative exchange of the labile axial ligands (L). This work investigates axial ligand exchange dynamics of [Co(acacen)(L)2](+) complexes toward the development of protein inhibitors that are activated by external triggers such as light irradiation. We sought to investigate ligand exchange dynamics to design a Co(III) complex that is substitutionally inert under normal physiological conditions for selective activation. Fluorescent imidazoles (C3Im) were prepared as axial ligands in [Co(acacen)(L)2](+) to produce complexes (CoC3Im) that could report on ligand exchange and, thus, complex stability. These fluorescent imidazole reporters guided the design of a new dinuclear Co(III) Schiff base complex containing bridging diimidazole ligands, which exhibits enhanced stability to ligand exchange with competing imidazoles and to hydrolysis within a biologically relevant pH range. These studies inform the design of biocompatible Co(III) Schiff base complexes that can be selectively activated for protein inhibition with spatial and temporal specificity.
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Affiliation(s)
| | | | - Joseph L. Coomes
- Departments of Chemistry, Molecular Biosciences, Neurobiology, Biomedical Engineering, and Radiology, Northwestern University, Evanston, Illinois 60208-3113, United States
| | - Allison S. Harney
- Departments of Chemistry, Molecular Biosciences, Neurobiology, Biomedical Engineering, and Radiology, Northwestern University, Evanston, Illinois 60208-3113, United States
| | - Elizabeth A. Bajema
- Departments of Chemistry, Molecular Biosciences, Neurobiology, Biomedical Engineering, and Radiology, Northwestern University, Evanston, Illinois 60208-3113, United States
| | - Thomas J. Meade
- Departments of Chemistry, Molecular Biosciences, Neurobiology, Biomedical Engineering, and Radiology, Northwestern University, Evanston, Illinois 60208-3113, United States
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74
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Supramolecular interactions through lone pair(lp)–π and hydrogen bonding in cobalt(III) and manganese(II) derivatives of N,N′-dimethylvioluric acid: A combined experimental and theoretical study. Inorganica Chim Acta 2015. [DOI: 10.1016/j.ica.2015.06.018] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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75
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Synthesis, crystal structure, antibacterial activity and theoretical studies on a novel mononuclear cobalt(II) complex based on 2,4,6-tris(2-pyridyl)-1,3,5-triazine ligand. J Mol Struct 2015. [DOI: 10.1016/j.molstruc.2015.03.037] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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76
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Gup R, Gökçe C, Dilek N. Seven-coordinated cobalt(II) complexes with 2,6-diacetylpyridine bis(4-hydroxybenzoylhydrazone): synthesis, characterisation, DNA binding and cleavage properties. Supramol Chem 2015. [DOI: 10.1080/10610278.2015.1051978] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Ramazan Gup
- Department of Chemistry, Faculty of Science, Mugla Sιtkι Koçman University, 48100 Mugla, Turkey
| | - Cansu Gökçe
- Department of Chemistry, Faculty of Science, Mugla Sιtkι Koçman University, 48100 Mugla, Turkey
| | - Nefise Dilek
- Department of Physics, Faculty of Arts and Sciences, Aksaray University, 68100 Aksaray, Turkey
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77
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Holbrook RJ, Weinberg DJ, Peterson MD, Weiss EA, Meade TJ. Light-activated protein inhibition through photoinduced electron transfer of a ruthenium(II)-cobalt(III) bimetallic complex. J Am Chem Soc 2015; 137:3379-85. [PMID: 25671465 DOI: 10.1021/jacs.5b00342] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
We describe a mechanism of light activation that initiates protein inhibitory action of a biologically inert Co(III) Schiff base (Co(III)-sb) complex. Photoinduced electron transfer (PET) occurs from a Ru(II) bipyridal complex to a covalently attached Co(III) complex and is gated by conformational changes that occur in tens of nanoseconds. Reduction of the Co(III)-sb by PET initiates displacement of the inert axial imidazole ligands, promoting coordination to active site histidines of α-thrombin. Upon exposure to 455 nm light, the rate of ligand exchange with 4-methylimidazole, a histidine mimic, increases by approximately 5-fold, as observed by NMR spectroscopy. Similarly, the rate of α-thrombin inhibition increases over 5-fold upon irradiation. These results convey a strategy for light activation of inorganic therapeutic agents through PET utilizing redox-active metal centers.
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Affiliation(s)
- Robert J Holbrook
- Department of Chemistry, Northwestern University , Evanston, Illinois 60208, United States
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78
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Özdemir M, Sönmez M, Şen F, Dinçer M, Özdemir N. A novel one-pot synthesis of heterocyclic compound (4-benzoyl-5-phenyl-2-(pyridin-2-yl)-3,3a-dihydropyrazolo[1,5-c]pyrimidin-7(6H)-one): structural (X-ray and DFT) and spectroscopic (FT-IR, NMR, UV-Vis and Mass) characterization studies. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 137:1304-1314. [PMID: 25305624 DOI: 10.1016/j.saa.2014.08.131] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2014] [Revised: 08/27/2014] [Accepted: 08/31/2014] [Indexed: 06/04/2023]
Abstract
In this study, the title compound named as 4-benzoyl-5-phenyl-2-(pyridin-2-yl)-3,3a-dihydropyrazolo[1,5-c]pyrimidin-7(6H)-one (C24H18N4O2) was both experimentally and theoretically investigated. The compound was synthesized and characterized by FT-IR, NMR ((1)H NMR, (13)C NMR and HETCOR-NMR), Mass spectroscopies and single-crystal X-ray diffraction methods. The compound crystallizes in the monoclinic space group P2(1)/n with a=6.1402 (3) Å, b=21.4470 (15) Å, c=15.0049 (8) Å and β=97.407 (4)°. The molecular geometry was obtained from the X-ray structure determination optimized using density functional theory (DFT/B3LYP) method with the 6-31+G(d, p) basis set in ground state. From the optimized structure, geometric parameters, vibrational wavenumbers and chemical shifts of molecule were obtained. Experimental measurements were compared with its corresponding the calculated data. An excellent harmony between the two data was ascertained. Besides, molecular electrostatic potential (MEP), frontier molecular orbitals (FMOs) and non-linear optical (NLO) properties of the title molecule were investigated by theoretical calculations at the B3LYP/6-31+G(d, p) level.
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Affiliation(s)
- Mecit Özdemir
- Kilis 7 Aralık University, Arts and Sciences Faculty, Department of Chemistry, 79000 Kilis, Turkey.
| | - Mehmet Sönmez
- Gaziantep University, Arts and Sciences Faculty, Department of Chemistry, 27310 Gaziantep, Turkey
| | - Fatih Şen
- Kilis 7 Aralık University, Vocational High School of Health Services, Department of Opticianry, 79000 Kilis, Turkey
| | - Muharrem Dinçer
- Ondokuz Mayıs University, Arts and Sciences Faculty, Department of Physics, 55139 Samsun, Turkey
| | - Namık Özdemir
- Ondokuz Mayıs University, Arts and Sciences Faculty, Department of Physics, 55139 Samsun, Turkey
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79
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Na YJ, Choi YW, Yun JY, Park KM, Chang PS, Kim C. Dual-channel detection of Cu(2+) and F(-) with a simple Schiff-based colorimetric and fluorescent sensor. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 136 Pt C:1649-1657. [PMID: 25459728 DOI: 10.1016/j.saa.2014.10.060] [Citation(s) in RCA: 73] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2014] [Revised: 10/10/2014] [Accepted: 10/12/2014] [Indexed: 06/04/2023]
Abstract
A simple and easily synthesized colorimetric and fluorescent receptor 1, based on 4-diethylaminosalicylaldehyde moieties as a binding and signaling unit, has been synthesized and characterized. The receptor 1 has a selective colorimetric sensing ability for copper (II) ion by changing color from colorless to yellow in aqueous solution, and could be utilized to monitor Cu(II) over a wide pH range of 4-11. In addition, the detection limit (12μM) of 1 for Cu(2+) is much lower than that (30μM) recommended by WHO in drinking water, and its copper complex could be reversible simply through treatment with a proper reagent such as EDTA. Moreover, receptor 1 exhibited both a color change from colorless to yellow and fluorescence enhancement with a red shift upon addition to F(-) in DMSO. The recognition mechanism was attributed to the intermolecular proton transfer between the hydroxyl group of the receptor and the fluoride.
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Affiliation(s)
- Yu Jeong Na
- Department of Fine Chemistry and Department of Interdisciplinary Bio IT Materials, Seoul National University of Science and Technology, Seoul 139-743, Republic of Korea
| | - Ye Won Choi
- Department of Fine Chemistry and Department of Interdisciplinary Bio IT Materials, Seoul National University of Science and Technology, Seoul 139-743, Republic of Korea
| | - Jin Yeong Yun
- Department of Fine Chemistry and Department of Interdisciplinary Bio IT Materials, Seoul National University of Science and Technology, Seoul 139-743, Republic of Korea
| | - Kyung-Min Park
- Department of Agricultural Biotechnology, Center for Food and Bioconvergence, and Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 151-742, Republic of Korea
| | - Pahn-Shick Chang
- Department of Agricultural Biotechnology, Center for Food and Bioconvergence, and Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 151-742, Republic of Korea.
| | - Cheal Kim
- Department of Fine Chemistry and Department of Interdisciplinary Bio IT Materials, Seoul National University of Science and Technology, Seoul 139-743, Republic of Korea.
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80
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Characterization, crystal structures, electrochemical and antibacterial studies of four new binuclear cobalt(III) complexes derived from o-aminobenzyl alcohol. Inorganica Chim Acta 2015. [DOI: 10.1016/j.ica.2014.10.023] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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81
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Amirnasr M, Sadeghi Erami R, Mereiter K, Schenk Joß K, Meghdadi S, Abbasi S. Syntheses, characterizations, X-ray crystal structures, and antibacterial activities of Co(II), Ni(II), and Zn(II) complexes of the Schiff base derived from 5-nitro-2-hydroxybenzaldehyde and benzylamine. J COORD CHEM 2015. [DOI: 10.1080/00958972.2014.996144] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Mehdi Amirnasr
- Department of Chemistry, Isfahan University of Technology, Isfahan, Iran
| | | | - Kurt Mereiter
- Faculty of Chemistry, Vienna University of Technology, Vienna, Austria
| | - Kurt Schenk Joß
- CCC-IPSB, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
| | - Soraia Meghdadi
- Department of Chemistry, Isfahan University of Technology, Isfahan, Iran
| | - Soheila Abbasi
- Department of Biological Sciences, University of Isfahan, Isfahan, Iran
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82
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Benramdane R, Benghanem F, Ourari A, Keraghel S, Bouet G. Synthesis and characterization of a new Schiff base derived from 2,3-diaminopyridine and 5-methoxysalicylaldehyde and its Ni(II), Cu(II) and Zn(II) complexes. Electrochemical and electrocatalytical studies. J COORD CHEM 2015. [DOI: 10.1080/00958972.2014.994514] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Razika Benramdane
- Faculté de Technologie, Laboratoire d'Electrochimie, d'Ingénierie Moléculaire et de Catalyse Rédox (LEIMCR), Université Sétif-1, Sétif, Algeria
| | - Fatiha Benghanem
- Faculté de Technologie, Laboratoire d'Electrochimie, d'Ingénierie Moléculaire et de Catalyse Rédox (LEIMCR), Université Sétif-1, Sétif, Algeria
| | - Ali Ourari
- Faculté de Technologie, Laboratoire d'Electrochimie, d'Ingénierie Moléculaire et de Catalyse Rédox (LEIMCR), Université Sétif-1, Sétif, Algeria
| | - Saida Keraghel
- Faculté de Technologie, Laboratoire d'Electrochimie, d'Ingénierie Moléculaire et de Catalyse Rédox (LEIMCR), Université Sétif-1, Sétif, Algeria
| | - Gilles Bouet
- UFR des Sciences Pharmaceutiques et d’Ingénierie de la Santé, Laboratoire SONAS EA 921, SFR QUASAV 4207, UNAM, Université d’Angers, Angers Cedex 01, France
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83
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Irgi EP, Geromichalos GD, Balala S, Kljun J, Kalogiannis S, Papadopoulos A, Turel I, Psomas G. Cobalt(ii) complexes with the quinolone antimicrobial drug oxolinic acid: structure and biological perspectives. RSC Adv 2015. [DOI: 10.1039/c5ra05308k] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The interaction of cobalt(ii)–oxolinato complexes with DNA and albumins was investigated with spectroscopic and physicochemical techniques and molecular docking calculations.
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Affiliation(s)
- Evgenia P. Irgi
- Department of General and Inorganic Chemistry
- Faculty of Chemistry
- Aristotle University of Thessaloniki
- GR-54124 Thessaloniki
- Greece
| | - George D. Geromichalos
- Cell Culture, Molecular Modeling and Drug Design Lab
- Symeonidion Research Center
- Theagenion Cancer Hospital
- Thessaloniki GR-54007
- Greece
| | - Sofia Balala
- Department of Nutrition and Dietetics
- Faculty of Agriculture
- Food Technology and Nutrition
- Alexander Technological Educational Institution
- Thessaloniki
| | - Jakob Kljun
- Faculty of Chemistry and Chemical Technology
- University of Ljubljana
- 1000 Ljubljana
- Slovenia
| | - Stavros Kalogiannis
- Department of Nutrition and Dietetics
- Faculty of Agriculture
- Food Technology and Nutrition
- Alexander Technological Educational Institution
- Thessaloniki
| | - Athanasios Papadopoulos
- Department of Nutrition and Dietetics
- Faculty of Agriculture
- Food Technology and Nutrition
- Alexander Technological Educational Institution
- Thessaloniki
| | - Iztok Turel
- Faculty of Chemistry and Chemical Technology
- University of Ljubljana
- 1000 Ljubljana
- Slovenia
| | - George Psomas
- Department of General and Inorganic Chemistry
- Faculty of Chemistry
- Aristotle University of Thessaloniki
- GR-54124 Thessaloniki
- Greece
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84
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Nesterov DS, Nesterova OV, Guedes da Silva MFC, Pombeiro AJL. Catalytic behaviour of a novel Fe(iii) Schiff base complex in the mild oxidation of cyclohexane. Catal Sci Technol 2015. [DOI: 10.1039/c4cy00888j] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An iron coordination compound, possessing an unsaturated coordination environment, has been prepared by reaction of FeCl3 with a polydentate Schiff base revealing a complex catalytic behaviour in the mild oxidation of cyclohexane by hydrogen peroxide.
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Affiliation(s)
- Dmytro S. Nesterov
- Centro de Química Estrutural
- Instituto Superior Técnico
- Universidade de Lisboa
- 1049-001 Lisboa
- Portugal
| | - Oksana V. Nesterova
- Centro de Química Estrutural
- Instituto Superior Técnico
- Universidade de Lisboa
- 1049-001 Lisboa
- Portugal
| | | | - Armando J. L. Pombeiro
- Centro de Química Estrutural
- Instituto Superior Técnico
- Universidade de Lisboa
- 1049-001 Lisboa
- Portugal
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85
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Basu D, Allard MM, Xavier FR, Heeg MJ, Schlegel HB, Verani CN. Modulation of electronic and redox properties in phenolate-rich cobalt(iii) complexes and their implications for catalytic proton reduction. Dalton Trans 2015; 44:3454-66. [DOI: 10.1039/c4dt03337j] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The redox, spectroscopic and catalytic activity of a series of cobalt complexes with phenolate-rich environments was investigated. The complex [CoIII(LCl)MeOH] shows considerable proton reduction in MeCN:HOAc with TON = 10.8.
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Affiliation(s)
- Debashis Basu
- Department of Chemistry
- Wayne State University
- Detroit
- USA
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86
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Vinod Kumar V, Thenmozhi MK, Ganesan A, Ganesan SS, Anthony SP. Hyperbranched polyethylenimine-based sensor of multiple metal ions (Cu2+, Co2+and Fe2+): colorimetric sensing via coordination or AgNP formation. RSC Adv 2015. [DOI: 10.1039/c5ra13797g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A commercially available HPEI polymer has been used as a single colorimetric probe for the selective colorimetric sensing of multiple metal ions in aqueous solution with distinguishable colors.
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Affiliation(s)
- V. Vinod Kumar
- School of Chemical & Biotechnology
- SASTRA University
- Thanjavur-613401
- India
| | - M. K. Thenmozhi
- School of Chemical & Biotechnology
- SASTRA University
- Thanjavur-613401
- India
| | - Asaithampi Ganesan
- School of Chemical & Biotechnology
- SASTRA University
- Thanjavur-613401
- India
| | - S. Selva Ganesan
- School of Chemical & Biotechnology
- SASTRA University
- Thanjavur-613401
- India
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87
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Protogeraki C, Andreadou EG, Perdih F, Turel I, Pantazaki AA, Psomas G. Cobalt(II) complexes with the antimicrobial drug enrofloxacin: Structure, antimicrobial activity, DNA- and albumin-binding. Eur J Med Chem 2014; 86:189-201. [DOI: 10.1016/j.ejmech.2014.08.043] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2014] [Revised: 08/11/2014] [Accepted: 08/12/2014] [Indexed: 01/11/2023]
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88
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Synthesis, characterization, and X-ray crystal structure of cobalt(III) complexes with a N2O2-donor Schiff base and ancillary ligands. Spectral, antibacterial activity, and electrochemical studies. Polyhedron 2014. [DOI: 10.1016/j.poly.2014.05.049] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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89
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Synthesis, structure and in vitro biological activity of pyridoxal N(4)-substituted thiosemicarbazone cobalt(III) complexes. Inorganica Chim Acta 2014. [DOI: 10.1016/j.ica.2014.05.035] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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90
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Hasanzadeh M, Salehi M, Kubicki M, Shahcheragh SM, Dutkiewicz G, Pyziak M, Khaleghian A. Synthesis, crystal structures, spectroscopic studies and antibacterial properties of a series of mononuclear cobalt(III) Schiff base complexes. TRANSIT METAL CHEM 2014. [DOI: 10.1007/s11243-014-9841-x] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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91
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Shamsi M, Yadav S, Arjmand F. Synthesis and characterization of new transition metal {Cu(II), Ni(II) and Co(II)} l-phenylalanine–DACH conjugate complexes: In vitro DNA binding, cleavage and molecular docking studies. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2014; 136:1-11. [DOI: 10.1016/j.jphotobiol.2014.04.009] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2014] [Revised: 03/28/2014] [Accepted: 04/12/2014] [Indexed: 11/30/2022]
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92
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Kal S, Filatov AS, Dinolfo PH. Electrocatalytic Proton Reduction by a Dicobalt Tetrakis-Schiff Base Macrocycle in Nonaqueous Electrolyte. Inorg Chem 2014; 53:7137-45. [DOI: 10.1021/ic500121f] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Subhadeep Kal
- Department
of Chemistry and Chemical Biology, Rensselaer Polytechnic Institute, 110 Eighth Street, Troy, New York 12180, United States
| | - Alexander S. Filatov
- Department
of Chemistry, University at Albany, State University of New York, Albany, New York 12222, United States
| | - Peter H. Dinolfo
- Department
of Chemistry and Chemical Biology, Rensselaer Polytechnic Institute, 110 Eighth Street, Troy, New York 12180, United States
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93
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Okuhata M, Mochida T. Ionic liquids from the cationic cobalt(III) Schiff base complex, [Co(acacen)L2][Tf2N] (acacen = N,N′-bis(acetylacetone)ethylenediamine, Tf2N = bis(trifluoromethanesulfonyl)amide). J COORD CHEM 2014. [DOI: 10.1080/00958972.2014.917295] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Megumi Okuhata
- Department of Chemistry, Graduate School of Science, Kobe University, Kobe, Japan
| | - Tomoyuki Mochida
- Department of Chemistry, Graduate School of Science, Kobe University, Kobe, Japan
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94
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Beyramabadi SA, Eshtiagh-Hosseini H, Housaindokht MR, Shirzadi S, Morsali A, Naseri MA. Experimental and theoretical characterization of N,N′-bis(2,4-dihydroxybenzylidene)-1,2-diaminobenzene schiff base and its Cu(II) complex. J STRUCT CHEM+ 2014. [DOI: 10.1134/s0022476613060085] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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95
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Synthesis, crystal structure and electrochemistry of cobalt(III) carboxamide complexes with amine and azide ancillary ligands. Polyhedron 2014. [DOI: 10.1016/j.poly.2013.09.032] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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96
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Park GJ, Na YJ, Jo HY, Lee SA, Kim C. A colorimetric organic chemo-sensor for Co2+ in a fully aqueous environment. Dalton Trans 2014; 43:6618-22. [DOI: 10.1039/c4dt00423j] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
A novel practical “naked eye” probe for Co2+ in a fully aqueous solution has been developed.
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Affiliation(s)
- Gyeong Jin Park
- Department of Fine Chemistry
- Seoul National University of Science and Technology
- Seoul 139-743, Korea
| | - Yu Jeong Na
- Department of Fine Chemistry
- Seoul National University of Science and Technology
- Seoul 139-743, Korea
| | - Hyun Yong Jo
- Department of Fine Chemistry
- Seoul National University of Science and Technology
- Seoul 139-743, Korea
| | - Seul Ah Lee
- Department of Fine Chemistry
- Seoul National University of Science and Technology
- Seoul 139-743, Korea
| | - Cheal Kim
- Department of Fine Chemistry
- Seoul National University of Science and Technology
- Seoul 139-743, Korea
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97
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Darabi F, Hadadzadeh H, Ebrahimi M, Khayamian T, Rudbari HA. The piroxicam complex of cobalt(II): Synthesis in two different ionic liquids, structure, DNA- and BSA interaction and molecular modeling. Inorganica Chim Acta 2014. [DOI: 10.1016/j.ica.2013.09.035] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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98
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Fadaee F, Amirnasr M, Schenk-Joß K. Synthesis, characterization and X-ray crystal structures of two polymorphs of a cobalt(III) complex with a N3O2 pentadentate Schiff base ligand, and benzylamine: spectral and electrochemical studies. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2013. [DOI: 10.1007/s13738-013-0246-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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99
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Islam SM, Roy AS, Dalapati S, Saha R, Mondal P, Ghosh K, Chatterjee S, Sarkar K, Guchhait N, Mitra P. Synthesis, crystal structure and spectroscopic studies of a cobalt(III) Schiff base complex and its use as a heterogeneous catalyst for the oxidation reaction under mild condition. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/j.molcata.2013.09.022] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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100
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Heffern MC, Kurutz JW, Meade TJ. Spectroscopic elucidation of the inhibitory mechanism of Cys2His2 zinc finger transcription factors by cobalt(III) Schiff base complexes. Chemistry 2013; 19:17043-53. [PMID: 24203451 DOI: 10.1002/chem.201301659] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2013] [Revised: 10/05/2013] [Indexed: 01/22/2023]
Abstract
Transcription factors are key regulators in both normal and pathological cell processes. Affecting the activity of these proteins is a promising strategy for understanding gene regulation and developing effective therapeutics. Co(III) Schiff base complexes ([Co(acacen)(L)2](+) where L=labile axial ligands) have been shown to be potent inhibitors of a number of zinc metalloproteins including Cys2His2 zinc finger transcription factors. Inhibition by [Co(acacen)(L)2](+) of the target protein is believed to occur through a dissociative exchange of the labile axial ligands for histidine (His) residues essential for function. Here, we report a series of spectroscopic investigations with model peptides of zinc fingers that elucidate the interaction between [Co(acacen)(L)2](+) complexes and zinc finger transcription factors. Observed changes in NMR chemical shifts and 2D (1)H-(1)H NOESY NMR spectra demonstrate the preference of [Co(acacen)(L)2](+) complexes to coordinate His residues over other amino acids. The conformation of [Co(acacen)(L)2](+) upon His coordination was characterized by (1)H NMR spectroscopy, near-UV CD, and electronic absorption. These studies reveal that the resulting His-coordinated [Co(acacen)(L)2](+) complex possesses an octahedral structure. The effects of [Co(acacen)(L)2](+) complexes on the zinc-finger structure were assessed by the degree of hydrogen bonding (probed by 2D NMR spectroscopy) and secondary-structure profiles measured by far-UV CD. These structural studies demonstrate the ability of [Co(acacen)(L)2](+) complexes to disrupt the ββα structure of zinc fingers, resulting in primarily random-coil conformations. A mechanism is described wherein [Co(acacen)(L)2](+) complexes inhibit zinc finger transcription factor activity through selectively coordinating His residues in the zinc finger by dissociative ligand exchange and disrupting the ββα structural motif required for gene regulation.
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Affiliation(s)
- Marie C Heffern
- Department of Chemistry, Molecular Biosciences, Neurobiology, Biomedical Engineering, and Radiology, Northwestern University, Evanston, Illinois 60208-3113 (USA)
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