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Wakizaka M, Matsumoto T, Chang HC. Switching of the redox centers of a tris-2-mercaptophenolato chromium(III) metalloligand by a guest metal ion. Dalton Trans 2023; 52:1538-1542. [PMID: 36722901 DOI: 10.1039/d2dt03502b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
This work reports that the redox-active metalloligand (ML) fac-[CrIII(mp)3]3- (mp: 2-mercaptophenolato) coordinates with a Co(III) ion to afford the trianionic complex [CoIII{fac-CrIII(mp)3}2]3-. The free ML shows ligand-centered redox processes, whereas the guest-metal-bound trinuclear structure exhibited a guest-metal-centered Co(II)/Co(III) redox couple, demonstrating redox switching through guest-metal binding to the MLs.
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Affiliation(s)
- Masanori Wakizaka
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo, University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan. .,Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, 6-3 Aramaki-Aza-Aoba, Aoba-ku, Sendai 980-8578, Japan
| | - Takeshi Matsumoto
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo, University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan.
| | - Ho-Chol Chang
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo, University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan.
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Kundu BK, Ranjan R, Mukherjee A, Mobin SM, Mukhopadhyay S. Mannich base Cu(II) complexes as biomimetic oxidative catalyst. J Inorg Biochem 2019; 195:164-173. [PMID: 30954693 DOI: 10.1016/j.jinorgbio.2019.03.023] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Revised: 03/23/2019] [Accepted: 03/28/2019] [Indexed: 11/16/2022]
Abstract
Galactose Oxidase (GOase) and catechol oxidase (COase) are the metalloenzymes of copper having monomeric and dimeric sites of coordination, respectively. This paper summarizes the results of our studies on the structural, spectral and catalytic properties of new mononuclear copper (II) complexes [CuL(OAc)] (1), and [CuL2] (2), (HL = 2,4‑dichloro‑6‑{[(2'‑dimethyl‑aminoethyl)methylamino]methyl}‑phenol) which can mimic the functionalities of the metalloenzymes GOase and COase. The structure of the compounds has been elucidated by X-ray crystallography and the mimicked Cu(II) catalysts were further characterized by EPR. These mimicked models were used for GOase and COase catalysis. The GOase catalytic results were identified by GC-MS and, analyzed by HPLC at room temperature. The conversion of benzyl alcohol to benzaldehyde were significant in presence of a strong base, Bu4NOMe in comparison to the neutral medium. Apart from that, despite of being monomeric in nature, both the homogeneous catalysts are very prone to participate in COase mimicking oxidation reaction. Nevertheless, during COase catalysis, complex 1 was found to convert 3,5‑ditertarybutyl catechol (3,5-DTBC) to 3,5‑ditertarybutyl quinone (3,5-DTBQ) having greater rate constant, kcat or turn over number (TON) value over complex 2. The generation of reactive intermediates during COase catalysis were accounted by electrospray ionization mass spectrometry (ESI-MS). Through mechanistic approach, we found that H2O2 is the byproduct for both the GOase and COase catalysis, thus, confirming the generation of reactive oxygen species during catalysis. Notably, complex 1 having mono-ligand coordinating atmosphere has superior catalytic activity for both cases in comparison to complex 2, that is having di-ligand environment.
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Affiliation(s)
- Bidyut Kumar Kundu
- Discipline of Chemistry, School of Basic Sciences, Indian Institute of Technology Indore, Khandwa Road, Simrol, Indore 453552, India
| | - Rishi Ranjan
- Discipline of Chemistry, School of Basic Sciences, Indian Institute of Technology Indore, Khandwa Road, Simrol, Indore 453552, India
| | | | - Shaikh M Mobin
- Discipline of Chemistry, School of Basic Sciences, Indian Institute of Technology Indore, Khandwa Road, Simrol, Indore 453552, India
| | - Suman Mukhopadhyay
- Discipline of Chemistry, School of Basic Sciences, Indian Institute of Technology Indore, Khandwa Road, Simrol, Indore 453552, India; Discipline of Biosciences and Biomedical Engineering, School of Engineering, Indian Institute of Technology Indore, Khandwa Road, Simrol, Indore 453552, India.
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Holder AA, Taylor P, Magnusen AR, Moffett ET, Meyer K, Hong Y, Ramsdale SE, Gordon M, Stubbs J, Seymour LA, Acharya D, Weber RT, Smith PF, Dismukes GC, Ji P, Menocal L, Bai F, Williams JL, Cropek DM, Jarrett WL. Preliminary anti-cancer photodynamic therapeutic in vitro studies with mixed-metal binuclear ruthenium(II)-vanadium(IV) complexes. Dalton Trans 2013; 42:11881-99. [PMID: 23783642 PMCID: PMC3751419 DOI: 10.1039/c3dt50547b] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
We report the synthesis and characterisation of mixed-metal binuclear ruthenium(II)-vanadium(IV) complexes, which were used as potential photodynamic therapeutic agents for melanoma cell growth inhibition. The novel complexes, [Ru(pbt)2(phen2DTT)](PF6)2·1.5H2O 1 (where phen2DTT = 1,4-bis(1,10-phenanthrolin-5-ylsulfanyl)butane-2,3-diol and pbt = 2-(2'-pyridyl)benzothiazole) and [Ru(pbt)2(tpphz)](PF6)2·3H2O 2 (where tpphz = tetrapyrido[3,2-a:2',3'-c:3'',2''-h:2''',3'''-j]phenazine) were synthesised and characterised. Compound 1 was reacted with [VO(sal-L-tryp)(H2O)] (where sal-L-tryp = N-salicylidene-L-tryptophanate) to produce [Ru(pbt)2(phen2DTT)VO(sal-L-tryp)](PF6)2·5H2O 4; while [VO(sal-L-tryp)(H2O)] was reacted with compound 2 to produce [Ru(pbt)2(tpphz)VO(sal-L-tryp)](PF6)2·6H2O 3. All complexes were characterised by elemental analysis, HRMS, ESI MS, UV-visible absorption, ESR spectroscopy, and cyclic voltammetry, where appropriate. In vitro cell toxicity studies (with the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) colorimetric assay) via dark and light reaction conditions were carried out with sodium diaqua-4,4',4'',4''' tetrasulfophthalocyaninecobaltate(II) (Na4[Co(tspc)(H2O)2]), [VO(sal-L-tryp)(phen)]·H2O, and the chloride salts of complexes 3 and 4. Such studies involved A431, human epidermoid carcinoma cells; human amelanotic malignant melanoma cells; and HFF, non-cancerous human skin fibroblast cells. Both chloride salts of complexes 3 and 4 were found to be more toxic to melanoma cells than to non-cancerous fibroblast cells, and preferentially led to apoptosis of the melanoma cells over non-cancerous skin cells. The anti-cancer property of the chloride salts of complexes 3 and 4 was further enhanced when treated cells were exposed to light, while no such effect was observed on non-cancerous skin fibroblast cells. ESR and (51)V NMR spectroscopic studies were also used to assess the stability of the chloride salts of complexes 3 and 4 in aqueous media at pH 7.19. This research illustrates the potential for using mixed-metal binuclear ruthenium(II)-vanadium(IV) complexes to fight skin cancer.
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Affiliation(s)
- Alvin A. Holder
- Department of Chemistry and Biochemistry, The University of Southern Mississippi, 118 College Drive, # 5043, Hattiesburg, Mississippi 39406-0001, U.S.A. , telephone: 601-266-4767, and fax: 601-266-6075
| | - Patrick Taylor
- Department of Chemistry and Biochemistry, The University of Southern Mississippi, 118 College Drive, # 5043, Hattiesburg, Mississippi 39406-0001, U.S.A. , telephone: 601-266-4767, and fax: 601-266-6075
| | - Anthony R. Magnusen
- Department of Chemistry and Biochemistry, The University of Southern Mississippi, 118 College Drive, # 5043, Hattiesburg, Mississippi 39406-0001, U.S.A. , telephone: 601-266-4767, and fax: 601-266-6075
| | - Erick T. Moffett
- Department of Chemistry and Biochemistry, The University of Southern Mississippi, 118 College Drive, # 5043, Hattiesburg, Mississippi 39406-0001, U.S.A. , telephone: 601-266-4767, and fax: 601-266-6075
| | - Kyle Meyer
- Department of Biology, University of Dayton, 300 College Park, Dayton, OH 45469-2320, U.S.A
| | - Yiling Hong
- Department of Biology, University of Dayton, 300 College Park, Dayton, OH 45469-2320, U.S.A
| | - Stuart E. Ramsdale
- Department of Chemistry and Biochemistry, The University of Southern Mississippi, 118 College Drive, # 5043, Hattiesburg, Mississippi 39406-0001, U.S.A. , telephone: 601-266-4767, and fax: 601-266-6075
| | - Michelle Gordon
- Department of Chemistry and Biochemistry, The University of Southern Mississippi, 118 College Drive, # 5043, Hattiesburg, Mississippi 39406-0001, U.S.A. , telephone: 601-266-4767, and fax: 601-266-6075
| | - Javelyn Stubbs
- Department of Chemistry and Biochemistry, The University of Southern Mississippi, 118 College Drive, # 5043, Hattiesburg, Mississippi 39406-0001, U.S.A. , telephone: 601-266-4767, and fax: 601-266-6075
| | - Luke A. Seymour
- Department of Chemistry and Biochemistry, The University of Southern Mississippi, 118 College Drive, # 5043, Hattiesburg, Mississippi 39406-0001, U.S.A. , telephone: 601-266-4767, and fax: 601-266-6075
| | - Dhiraj Acharya
- Department of Biological Sciences, The University of Southern Mississippi, MS 39406, U.S.A
| | - Ralph T. Weber
- EPR Division Bruker BioSpin, 44 Manning Road, Billerica, MA 01821, U.S.A
| | - Paul F. Smith
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, U.S.A
| | - G. Charles Dismukes
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, U.S.A
| | - Ping Ji
- Department of Medicine, Stony Brook University, HSC T-17 room 080, Stony Brook, NY 11794-8175, U.S.A
| | - Laura Menocal
- Department of Medicine, Stony Brook University, HSC T-17 room 080, Stony Brook, NY 11794-8175, U.S.A
| | - Fengwei Bai
- Department of Biological Sciences, The University of Southern Mississippi, MS 39406, U.S.A
| | - Jennie L. Williams
- Department of Medicine, Stony Brook University, HSC T-17 room 080, Stony Brook, NY 11794-8175, U.S.A
| | - Donald M. Cropek
- U.S. Army Corps of Engineers, Construction Engineering Research Laboratory, Champaign, IL 61822, U.S.A
| | - William L. Jarrett
- School of Polymers and High-Performance Materials, The University of Southern Mississippi, 118 College Drive, #5050, Hattiesburg, MS 39406-0076, U.S.A
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