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Steinke SJ, Dunbar MN, Amalfi Suarez MA, Turro C. Ru(II) Complexes with Absorption in the Photodynamic Therapy Window: 1O 2 Sensitization, DNA Binding, and Plasmid DNA Photocleavage. Inorg Chem 2024; 63:11450-11458. [PMID: 38823006 DOI: 10.1021/acs.inorgchem.4c01665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2024]
Abstract
Two Ru(II) complexes, [Ru(pydppn)(bim)(py)]2+ [2; pydppn = 3-(pyrid-2'-yl)-4,5,9,16-tetraaza-dibenzo[a,c]naphthacene; bim = 2,2'-bisimidazole; py = pyridine] and [Ru(pydppn)(Me4bim)(py)]2+ [3; Me4bim = 2,2'-bis(4,5-dimethylimidazole)], were synthesized and characterized, and their photophysical properties, DNA binding, and photocleavage were evaluated and compared to [Ru(pydppn)(bpy)(py)]2+ (1; bpy = 2,2'-bipyridine). Complexes 2 and 3 exhibit broad 1MLCT (metal-to-ligand charge transfer) transitions with maxima at ∼470 nm and shoulders at ∼525 and ∼600 nm that extend to ∼800 nm. These bands are red-shifted relative to those of 1, attributed to the π-donating ability of the bim and Me4bim ligands. A strong signal at 550 nm is observed in the transient absorption spectra of 1-3, previously assigned as arising from a pydppn-centered 3ππ* state, with lifetimes of ∼19 μs for 1 and 2 and ∼270 ns for 3. A number of methods were used to characterize the mode of binding of 1-3 to DNA, including absorption titrations, thermal denaturation, relative viscosity changes, and circular dichroism, all of which point to the intercalation of the pydpppn ligand between the nucleobases. The photocleavage of plasmid pUC19 DNA was observed upon the irradiation of 1-3 with visible and red light, attributed to the sensitized generation of 1O2 by the complexes. These findings indicate that the bim ligand, together with pydppn, serves to shift the absorption of Ru(II) complexes to the photodynamic therapy window, 600-900 nm, and also extend the excited state lifetimes for the efficient production of cytotoxic singlet oxygen.
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Affiliation(s)
- Sean J Steinke
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United States
| | - Marilyn N Dunbar
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United States
| | - M Agustina Amalfi Suarez
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United States
| | - Claudia Turro
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United States
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2
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Loreto D, Esposito A, Demitri N, Guaragna A, Merlino A. Digging into protein metalation differences triggered by fluorine containing-dirhodium tetracarboxylate analogues. Dalton Trans 2022; 51:7294-7304. [DOI: 10.1039/d2dt00873d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Catalytic and biological properties of dirhodium tetracarboxylates ([Rh2(μ-O2CR)4L2], L=axial ligand, R=CH3-, CH3CH2-, etc) largely depend on the nature of the bridging carboxylate equatorial μ-O2CR ligands, which can be easily exchanged...
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3
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Schmorl S, Börner M, Kersting B. Stable thiolate adducts of Rh 2(OAc) 4 - assembly of hexametallic Ni 4Rh 2 complexes. Dalton Trans 2021; 51:59-62. [PMID: 34889331 DOI: 10.1039/d1dt03509f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Thiolate adducts of dirhodium(II) tetraacetate have proven difficult to prepare. We isolated a stable, paramagnetic Ni4Rh2 adduct containing Ni-based metallothiolates bound in axial positions of the Rh24+ core. The adduct formation is accompanied by a change of the magnetic exchange interaction in the dinuclear Ni2 subunits.
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Affiliation(s)
- Sara Schmorl
- Institut für Anorganische Chemie, Universität Leipzig, Johannisallee 29, 04103 Leipzig, Germany.
| | - Martin Börner
- Institut für Anorganische Chemie, Universität Leipzig, Johannisallee 29, 04103 Leipzig, Germany.
| | - Berthold Kersting
- Institut für Anorganische Chemie, Universität Leipzig, Johannisallee 29, 04103 Leipzig, Germany.
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4
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Laconsay CJ, Pla-Quintana A, Tantillo DJ. Effects of Axial Solvent Coordination to Dirhodium Complexes on the Reactivity and Selectivity in C–H Insertion Reactions: A Computational Study. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00574] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Croix J. Laconsay
- Department of Chemistry, University of California, Davis, California 95616, United States
| | - Anna Pla-Quintana
- Department of Chemistry, University of California, Davis, California 95616, United States
- Institut de Química Computacional i Catàlisi (IQCC) and Departament de Química, Facultat de Ciències, Universitat de Girona (UdG), C/Maria Aurèlia Capmany, 69, Girona 17003, Catalunya, Spain
| | - Dean J. Tantillo
- Department of Chemistry, University of California, Davis, California 95616, United States
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5
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Abshire A, Moore D, Courtney J, Darko A. Heteroleptic dirhodium(II,II) paddlewheel complexes as carbene transfer catalysts. Org Biomol Chem 2021; 19:8886-8905. [PMID: 34611688 DOI: 10.1039/d1ob01414e] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This review highlights the applications of dirhodium(II,II) paddlewheel complexes with a heteroleptic scaffold. Dirhodium(II,II) paddlewheel complexes are well known as highly efficient and selective carbene transfer catalysts. While the majority of described complexes are homoleptic, comparatively fewer studies have concerned heteroleptic complexes. Here, we emphasise the use of heteroleptic complexes in order to highlight their benefits as carbene transfer catalysts and spur future research. Methods to synthesise heteroleptic dirhodium(II,II) paddlewheel complexes are discussed as well as a categorical review of their types of heteroleptic complexes and the carbene reactions in which they have been used.
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Affiliation(s)
- Anthony Abshire
- Department of Chemistry, University of Tennessee, Knoxville, TN 37796-1600, USA.
| | - Desiree Moore
- Department of Chemistry, University of Tennessee, Knoxville, TN 37796-1600, USA.
| | - Jobe Courtney
- Department of Chemistry, University of Tennessee, Knoxville, TN 37796-1600, USA.
| | - Ampofo Darko
- Department of Chemistry, University of Tennessee, Knoxville, TN 37796-1600, USA.
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6
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Binding of histidine and human serum albumin to dirhodium(II) tetraacetate. J Inorg Biochem 2021; 224:111556. [PMID: 34425475 DOI: 10.1016/j.jinorgbio.2021.111556] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Revised: 07/08/2021] [Accepted: 07/16/2021] [Indexed: 10/20/2022]
Abstract
Reactions of the anticancer active dirhodium tetraacetate (1), Rh2(AcO)4 (AcO- = CH3COO-), with the amino acid histidine (HHis) and human serum albumin (HSA) were monitored over time and different metal: ligand ratios using UV-vis spectroscopy and/or electro-spray ionization mass spectrometry. Initially, histidine formed 1:1 and 1:2 adducts in aqueous solutions. The crystal structure of Rh2(AcO)4(L-HHis)2·2H2O (2) confirmed the axial coordination of histidine imidazole groups (average Rh-Naxial 2.23 Å). These adducts, however, were found to be unstable in solution over time (24 h). Heating Rh2(AcO)4 -histidine solutions to 40 °C (near body temperature) or 95 °C accelerated the formation of RhII2(AcO)2(His)2 and RhIII(His)2(AcO) complexes. The corresponding pH change from neutral to mildly acid (pH 4-5) indicates deprotonation of histidine NH3+ groups due to coordination to Rh ions, which simultaneously bind to histidine COO- groups, as evidenced by 13C NMR spectroscopy. In the case of HSA with 16 histidine and one cysteine residues, UV-vis spectroscopy indicates that mono- and di-histidine HSA adducts with Rh2(AcO)4 are formed. X-ray absorption spectroscopy showed almost the same Rh-Rh distance (2.41 ± 0.01 Å) for the Rh2(AcO)4 units as in 2, and a contribution from an axial thiol coordination (Rh-Saxial 2.62 ± 0.05 Å). The Rh2(AcO)4 - HSA complex was found to decompose partially (~15%) over 24 h at ambient temperature. The partial decomposition of Rh2(AcO)4 both through coordination to histidine or to human serum albumin, the most abundant protein in blood plasma, is a factor to consider for its efficacy as a potential anticancer agent.
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Millet A, Xue C, Song E, Turro C, Dunbar KR. Synthetic Strategies for Trapping the Elusive trans-Dirhodium(II,II) Formamidinate Isomer: Effects of Cis versus Trans Geometry on the Photophysical Properties. Inorg Chem 2020; 59:2255-2265. [PMID: 31999106 DOI: 10.1021/acs.inorgchem.9b02966] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The cis- and trans-dirhodium(II,II) complexes cis-[Rh2(μ-DTolF)2(μ-np)(MeCN)4][BF4]2 (1; DTolF = N,N'-di-p-tolylformamidinate and np = 1,8-naphthyridine), cis- and trans-[Rh2(μ-DTolF)2(μ-qxnp)(MeCN)3][BF4]2 [2 and 3, respectively, where qxnp = 2-(1,8-naphthyridin-2-yl)quinoxaline], and trans-[Rh2(μ-DTolF)2(μ-qxnp)2][BF4]2 (4) were synthesized and characterized. A new synthetic methodology was developed that consists of the sequential addition of π-accepting axially blocking ligands to favor formation of the first example of a bis-substituted formamidinate-bearing trans product. Isolation of the intermediates 2 and 3 provides insight into the mechanistic requirements for obtaining 4 and the cis analogue, cis-[Rh2(μ-DTolF)2(μ-qxnp)2][BF4]2 (5). Density functional theory calculations provide support for the synthetic mechanism and proposed intermediates. The metal/ligand-to-ligand charge-transfer (ML-LCT) absorption maximum of the trans complex 4 at 832 nm is red-shifted by 1173 cm-1 and exhibits shorter lifetimes of the 1ML-LCT and 3ML-LCT excited states, 3 ps and 0.40 ns, respectively, compared to those of the cis analogue 5. The shorter excited-state lifetimes of 4 are attributed to the longer Rh-Rh bond of 2.4942(8) Å relative to that in 5, 2.4498(2) Å. A longer metal-metal bond reflects a decreased overlap of the Rh atoms, which leads to more accessible metal-centered excited states for radiationless deactivation. The 3ML-LCT excited states of 4 and 5 undergo reversible bimolecular charge transfer with the electron donor p-phenylenediamine when irradiated with low-energy light. These results indicate that trans isomers are a source of unexplored tunability for potential p-type semiconductor applications and, given their distinct geometric arrangement, constitute useful building blocks for supramolecular architectures with potentially interesting photophysical properties.
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Affiliation(s)
- Agustin Millet
- Department of Chemistry , Texas A&M University , College Station , Texas 77843 , United States
| | - Congcong Xue
- Department of Chemistry and Biochemistry , The Ohio State University , Columbus , Ohio 43210 , United States
| | - Ellen Song
- Department of Chemistry , Texas A&M University , College Station , Texas 77843 , United States
| | - Claudia Turro
- Department of Chemistry and Biochemistry , The Ohio State University , Columbus , Ohio 43210 , United States
| | - Kim R Dunbar
- Department of Chemistry , Texas A&M University , College Station , Texas 77843 , United States
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8
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Wei B, Sharland JC, Lin P, Wilkerson-Hill SM, Fullilove FA, McKinnon S, Blackmond DG, Davies HML. In Situ Kinetic Studies of Rh(II)-Catalyzed Asymmetric Cyclopropanation with Low Catalyst Loadings. ACS Catal 2019. [DOI: 10.1021/acscatal.9b04595] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Bo Wei
- Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, Georgia 30322, United States
| | - Jack C. Sharland
- Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, Georgia 30322, United States
| | - Patricia Lin
- Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, Georgia 30322, United States
| | - Sidney M. Wilkerson-Hill
- Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, Georgia 30322, United States
| | - Felicia A. Fullilove
- Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, Georgia 30322, United States
| | - Sam McKinnon
- Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, Georgia 30322, United States
| | - Donna G. Blackmond
- Department of Chemistry, The Scripps Research Institute, La Jolla, California 92037, United States
| | - Huw M. L. Davies
- Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, Georgia 30322, United States
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9
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Huang XC, Xu R, Chen YZ, Zhang YQ, Shao D. Two Four-Coordinate and Seven-Coordinate Co II Complexes Based on the Bidentate Ligand 1, 8-Naphthyridine Showing Slow Magnetic Relaxation Behavior. Chem Asian J 2019; 15:279-286. [PMID: 31793204 DOI: 10.1002/asia.201901395] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Revised: 11/30/2019] [Indexed: 12/11/2022]
Abstract
For a long time, the cobalt(II) complex ([Co(napy)4 ](ClO4 )2 ) (napy=1, 8-naphthyridine) has been considered as an eight-coordinate complex without any structural proof. After careful considerations, two complexes [Co(napy)2 Cl2 ] (1) and [Co(napy)4 ](ClO4 )2 (2) based on the bidentate ligand napy were synthesized and structurally characterized. X-ray single-crystal structural determination showed that the cobalt(II) center in [Co(napy)2 Cl2 ] (1) is four-coordinate with a tetrahedral geometry (Td ), while [Co(napy)4 ](ClO4 )2 (2) is seven-coordinate rather than eight-coordinate with a capped trigonal prism geometry (C2v ). Direct-current (dc) magnetic data revealed that complexes 1 and 2 possess positive zero-field splitting (ZFS) parameters of 11.08 and 25.30 cm-1 , respectively, with easy-plane magnetic anisotropy. Alternating current(ac) susceptibility measurements revealed that both complexes showed slow magnetic relaxation behaviour. Theoretical calculations demonstrated that the presence of easy-plane magnetic anisotropy (D>0) for complexes 1 and 2 is in agreement with the experimental data. Furthermore, these results pave the way to obtain four-coordinate and seven-coordinate cobalt(II) single-ion magnets (SIMs) by using a bidentate ligand.
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Affiliation(s)
- Xing-Cai Huang
- School of Chemistry and Environmental Engineering, Yancheng Teachers University, Yancheng, 224007, China
| | - Rui Xu
- School of Chemistry and Environmental Engineering, Yancheng Teachers University, Yancheng, 224007, China
| | - Yong-Zhi Chen
- School of Chemistry and Environmental Engineering, Yancheng Teachers University, Yancheng, 224007, China
| | - Yi-Quan Zhang
- Jiangsu Key Lab for NSLSCS, School of Physical Science and Technology, Nanjing Normal University, Nanjing, 210023, China
| | - Dong Shao
- School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, China
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10
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Felder PS, Keller S, Gasser G. Polymetallic Complexes for Applications as Photosensitisers in Anticancer Photodynamic Therapy. ADVANCED THERAPEUTICS 2019. [DOI: 10.1002/adtp.201900139] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Patrick S. Felder
- Chimie ParisTechPSL UniversityCNRSInstitute of Chemistry for Life and Health SciencesLaboratory for Inorganic Chemical BiologyF‐75005 Paris France
| | - Sarah Keller
- Chimie ParisTechPSL UniversityCNRSInstitute of Chemistry for Life and Health SciencesLaboratory for Inorganic Chemical BiologyF‐75005 Paris France
| | - Gilles Gasser
- Chimie ParisTechPSL UniversityCNRSInstitute of Chemistry for Life and Health SciencesLaboratory for Inorganic Chemical BiologyF‐75005 Paris France
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11
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Brunskill V, Enriquez Garcia A, Jalilehvand F, Gelfand BS, Wu M. Reaction of dirhodium(II) tetraacetate with S-methyl- L-cysteine. J COORD CHEM 2019. [DOI: 10.1080/00958972.2019.1651845] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
| | | | | | | | - Mengya Wu
- Department of Chemistry, University of Calgary, Calgary, Canada
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12
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Enriquez Garcia A, Jalilehvand F, Niksirat P. Reactions of Rh 2(CH 3COO) 4 with thiols and thiolates: a structural study. JOURNAL OF SYNCHROTRON RADIATION 2019; 26:450-461. [PMID: 30855255 PMCID: PMC6412178 DOI: 10.1107/s160057751900033x] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Accepted: 01/07/2019] [Indexed: 06/09/2023]
Abstract
The structural differences between the aerobic reaction products of Rh2(AcO)4 (1; AcO- = CH3COO-) with thiols and thiolates in non-aqueous media are probed by X-ray absorption spectroscopy. For this study, ethanethiol, dihydrolipoic acid (DHLA; a dithiol) and their sodium thiolate salts were used. Coordination of simple thiols to the axial positions of Rh2(AcO)4 with Rh-SH bonds of 2.5-2.6 Å keeps the RhII-RhII bond intact (2.41 ± 0.02 Å) but leads to a colour change from emerald green to burgundy. Time-dependent density functional theory (TD-DFT) calculations were performed to explain the observed shifts in the electronic (UV-vis) absorption spectra. The corresponding sodium thiolates, however, break up the Rh2(AcO)4 framework in the presence of O2 to form an oligomeric chain of triply S-bridged Rh(III) ions, each with six Rh-S (2.36 ± 0.02 Å) bonds. The RhIII...RhIII distance, 3.18 ± 0.02 Å, in the chain is similar to that previously found for the aerobic reaction product from aqueous solutions of Rh2(AcO)4 and glutathione (H3A), {Na2[Rh2III(HA)4]·7H2O}n, in which each Rh(III) ion is surrounded by about four Rh-S (2.33 ± 0.02 Å) and about two Rh-O (2.08 ± 0.02 Å). The reaction products obtained in this study can be used to predict how dirhodium(II) tetracarboxylates would react with cysteine-rich proteins and peptides, such as metallothioneins.
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Affiliation(s)
- Alejandra Enriquez Garcia
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4
| | - Farideh Jalilehvand
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4
| | - Pantea Niksirat
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4
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13
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Abstract
As a rare element with no known natural biological function, rhodium has a limited history in biological chemistry and chemical biology. However, rhodium complexes have unique structure and reactivity attributes, and chemists have increasingly used these attributes to probe and perturb living systems. This brief review focuses on recent advances in the use of rhodium complexes in biological contexts, including medicinal chemistry, protein science, and chemical biology. In particular, we highlight both structure- and reactivity-driven approaches to biological probes and discuss how coordination environment affects molecular properties in a biological environment.
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Affiliation(s)
- Jun Ohata
- Department of Chemistry, Rice University, 6100 Main St., Houston, Texas, USA.
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14
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Enriquez Garcia A, Lai B, Gopinathan SG, Harris HH, Shemanko CS, Jalilehvand F. Nuclear localization of dirhodium(ii) complexes in breast cancer cells by X-ray fluorescence microscopy. Chem Commun (Camb) 2019; 55:8223-8226. [DOI: 10.1039/c9cc00521h] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
X-ray fluorescence microscopy confirms the necessity of vacant axial sites in dirhodium(ii) carboxylates for their cellular uptake and cytotoxicity.
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Affiliation(s)
| | - Barry Lai
- Advanced Photon Source
- X-ray Science Division
- Argonne National Laboratory
- Argonne
- USA
| | | | - Hugh H. Harris
- Department of Chemistry
- The University of Adelaide
- Australia
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15
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Enriquez Garcia A, Jalilehvand F, Niksirat P, Gelfand BS. Methionine Binding to Dirhodium(II) Tetraacetate. Inorg Chem 2018; 57:12787-12799. [PMID: 30247895 PMCID: PMC6311416 DOI: 10.1021/acs.inorgchem.8b01979] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The reaction between antitumor active dirhodium(II) tetraacetate and dl-methionine (HMet) was followed in aqueous solution and showed initially mixtures of 1:1 and 1:2 adducts [Rh2(AcO)4(HMet)(H2O)] (AcO- = CH3COO-) and [Rh2(AcO)4(HMet)2] formed at room temperature (RT), as evidenced by UV-vis spectroscopy and electrospray ionization mass spectrometry (ESI-MS). Rh K-edge extended X-ray absorption fine structure (EXAFS) spectroscopy confirmed methionine thioether binding to the axial positions of the Rh2(AcO)4 cage structure. With excess HMet at RT, stepwise displacement of the acetate groups was observed after some time using ESI-MS. Heating the solution to 40° for 24 h accelerated the substitution reaction leading to stable dirhodium(II) species with two acetate ligands displaced by two methionine groups. The crystal structure of the purple [RhII2(AcO)2(d-Met)(l-Met)]·6H2O compound obtained from the solution revealed tridentate coordination of the methionine ligands to the Rh(II) ions, with the thioether S atoms in equatorial positions. A minor amount of a light orange monomeric [RhIII(Met)2](AcO) complex also formed in the solution was isolated by size exclusion chromatography and identified by ESI-MS. Crystals of [RhIII(d-Met)(l-Met)]Cl·3H2O were prepared by reacting RhCl3 and dl-HMet. The crystal structure showed tridentate binding of the methionine ligands to the Rh(III) ion in a trans-S, N, O arrangement.
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Affiliation(s)
| | - Farideh Jalilehvand
- Department of Chemistry , University of Calgary , Calgary , Alberta , Canada T2N 1N4
| | - Pantea Niksirat
- Department of Chemistry , University of Calgary , Calgary , Alberta , Canada T2N 1N4
| | - Benjamin S Gelfand
- Department of Chemistry , University of Calgary , Calgary , Alberta , Canada T2N 1N4
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16
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Whittemore TJ, Millet A, Sayre HJ, Xue C, Dolinar BS, White EG, Dunbar KR, Turro C. Tunable Rh 2(II,II) Light Absorbers as Excited-State Electron Donors and Acceptors Accessible with Red/Near-Infrared Irradiation. J Am Chem Soc 2018; 140:5161-5170. [PMID: 29617115 DOI: 10.1021/jacs.8b00599] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A series of dirhodium(II,II) paddlewheeel complexes of the type cis-[Rh2(μ-DTolF)2(μ-L)2][BF4]2, where DTolF = N,N'-di( p-tolyl)formamidinate and L = 1,8-naphthyridine (np), 2-(pyridin-2-yl)-1,8-naphthyridine (pynp), 2-(quinolin-2-yl)-1,8-naphthyridine (qnnp), and 2-(1,8-naphthyridin-2-yl)quinoxaline (qxnp), were synthesized and characterized. These molecules feature new tridentate ligands that concomitantly bridge the dirhodium core and cap the axial positions. The complexes absorb light strongly throughout the ultraviolet/visible range and into the near-infrared region and exhibit relatively long-lived triplet excited-state lifetimes. Both the singlet and triplet excited states exhibit metal/ligand-to-ligand charge transfer (ML-LCT) in nature as determined by transient absorption spectroscopy and spectroelectrochemistry measurements. When irradiated with low-energy light, these black dyes are capable of undergoing reversible bimolecular electron transfer both to the electron acceptor methyl viologen and from the electron donor p-phenylenediamine. Photoinduced charge transfer in the latter was inaccessible with previous Rh2(II,II) complexes. These results underscore the fact that the excited state of this class of molecules can be readily tuned for electron-transfer reactions upon simple synthetic modification and highlight their potential as excellent candidates for p- and n-type semiconductor applications and for improved harvesting of low-energy light to drive useful photochemical reactions.
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Affiliation(s)
- Tyler J Whittemore
- Department of Chemistry and Biochemistry , The Ohio State University , Columbus , Ohio 43210 , United States
| | - Agustin Millet
- Department of Chemistry , Texas A&M University , College Station , Texas 77843 , United States
| | - Hannah J Sayre
- Department of Chemistry and Biochemistry , The Ohio State University , Columbus , Ohio 43210 , United States
| | - Congcong Xue
- Department of Chemistry and Biochemistry , The Ohio State University , Columbus , Ohio 43210 , United States
| | - Brian S Dolinar
- Department of Chemistry , Texas A&M University , College Station , Texas 77843 , United States
| | - Eryn G White
- Department of Chemistry , Texas A&M University , College Station , Texas 77843 , United States
| | - Kim R Dunbar
- Department of Chemistry , Texas A&M University , College Station , Texas 77843 , United States
| | - Claudia Turro
- Department of Chemistry and Biochemistry , The Ohio State University , Columbus , Ohio 43210 , United States
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17
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Witt SE, White TA, Li Z, Dunbar KR, Turro C. Cationic dirhodium(ii,ii) complexes for the electrocatalytic reduction of CO 2 to HCOOH. Chem Commun (Camb) 2018; 52:12175-12178. [PMID: 27722523 DOI: 10.1039/c6cc03253b] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two formamidinate bridged dirhodium(ii,ii) complexes with chelating diimine ligands L, [Rh2(μ-DTolF)2(L)2]2+, were shown to electrocatalytically reduce CO2 in the presence of H2O. Analysis of the reaction mixture and headspace following bulk electrolysis revealed H2 and HCOOH as the major products. The variation in relative product formation is discussed.
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Affiliation(s)
- Suzanne E Witt
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, OH 43210, USA.
| | - Travis A White
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, OH 43210, USA.
| | - Zhanyong Li
- Department of Chemistry, Texas A&M University, College Station, TX 77843, USA.
| | - Kim R Dunbar
- Department of Chemistry, Texas A&M University, College Station, TX 77843, USA.
| | - Claudia Turro
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, OH 43210, USA.
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18
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Esteghamat-Panah R, Hadadzadeh H, Farrokhpour H, Simpson J, Abdolmaleki A, Abyar F. Synthesis, structure, DNA/protein binding, and cytotoxic activity of a rhodium(III) complex with 2,6-bis(2-benzimidazolyl)pyridine. Eur J Med Chem 2017; 127:958-971. [DOI: 10.1016/j.ejmech.2016.11.005] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2016] [Revised: 11/01/2016] [Accepted: 11/03/2016] [Indexed: 10/20/2022]
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19
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Tsai BC, Liu YH, Peng SM, Liu ST. Coordination Chemistry of an Unsymmetrical Naphthyridine-Based Tetradentate Ligand toward Various Transition-Metal Ions. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600163] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Bing-Chen Tsai
- Department of Chemistry; National Taiwan University; 1, Sec. 4, Roosevelt Road 10617 Taipei Taiwan
| | - Yi-Hung Liu
- Department of Chemistry; National Taiwan University; 1, Sec. 4, Roosevelt Road 10617 Taipei Taiwan
| | - Shie-Ming Peng
- Department of Chemistry; National Taiwan University; 1, Sec. 4, Roosevelt Road 10617 Taipei Taiwan
| | - Shiuh-Tzung Liu
- Department of Chemistry; National Taiwan University; 1, Sec. 4, Roosevelt Road 10617 Taipei Taiwan
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20
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Esteghamat-Panah R, Farrokhpour H, Hadadzadeh H, Abyar F, Rudbari HA. An experimental and quantum chemical study on the non-covalent interactions of a cyclometallated Rh(iii) complex with DNA and BSA. RSC Adv 2016. [DOI: 10.1039/c5ra24540k] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
The interaction of a new cyclometallated Rh(iii) complex with DNA and BSA was investigated. The three-layer ONIOM method was employed to calculate the interaction energy between DNA and the complex.
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Affiliation(s)
| | - Hossein Farrokhpour
- Department of Chemistry
- Isfahan University of Technology
- Isfahan 84156-83111
- Iran
| | - Hassan Hadadzadeh
- Department of Chemistry
- Isfahan University of Technology
- Isfahan 84156-83111
- Iran
| | - Fatemeh Abyar
- Department of Engineering
- Ardakan University
- Ardakan 89518-95491
- Iran
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21
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White TA, Dunbar KR, Thummel RP, Turro C. Electronic influences of bridging and chelating diimine ligand coordination in formamidinate-bridged Rh2(II,II) dimers. Polyhedron 2016. [DOI: 10.1016/j.poly.2015.10.015] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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22
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Palmer AM, Knoll JD, Turro C. Photoinduced interactions of two dirhodium complexes with d(GTCGAC)2 probed by 2D NOESY. Dalton Trans 2015; 44:3640-6. [PMID: 25557067 DOI: 10.1039/c4dt03119a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
The interactions between the 6-mer duplex oligonucleotide d(GTCGAC)2 and the photoactive dirhodium complexes cis-H,H-[Rh2(HNOCCH3)2(L)(CH3CN)4](2+), where L represents bpy (1, 2,2'-bipyridine) and dppz (2, dipyrido[3,2-a:2',3'-c]phenazine), were probed using 2D (1)H-(1)H NOESY NMR spectroscopy. Complex does not interact with the duplex in the dark, but binds covalently to the terminal guanine following irradiation with visible light. Similar behavior was observed for 2, but in addition to the photoinduced covalent DNA binding, the planar dppz ligand of the complex shields the terminal cytosine protons after irradiation. The results are consistent with photoinduced guanine coordination and end-capping of the duplex through π-stacking interactions with the terminal GC base pair. These data show that in the presence of the 6-mer duplex oligonucleotide, 1 and 2 exhibit photoinduced covalent binding to DNA. In addition, the π-stacking interactions of 2 with the duplex are enhanced upon irradiation.
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Affiliation(s)
- Alycia M Palmer
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, OH 43210, USA.
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23
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Majer Z, Bősze S, Szabó I, Mihucz VG, Gaál A, Szilvágyi G, Pepponi G, Meirer F, Wobrauschek P, Szoboszlai N, Ingerle D, Streli C. Study of dinuclear Rh(II) complexes of phenylalanine derivatives as potential anticancer agents by using X-ray fluorescence and X-ray absorption. Microchem J 2015. [DOI: 10.1016/j.microc.2015.01.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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24
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Tang GY, Pribisko MA, Henning RK, Lim P, Termini J, Gray HB, Grubbs RH. An in vitro enzymatic assay to measure transcription inhibition by gallium(III) and H3 5,10,15-tris(pentafluorophenyl)corroles. J Vis Exp 2015:52355. [PMID: 25867444 PMCID: PMC4401371 DOI: 10.3791/52355] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
Chemotherapy often involves broad-spectrum cytotoxic agents with many side effects and limited targeting. Corroles are a class of tetrapyrrolic macrocycles that exhibit differential cytostatic and cytotoxic properties in specific cell lines, depending on the identities of the chelated metal and functional groups. The unique behavior of functionalized corroles towards specific cell lines introduces the possibility of targeted chemotherapy. Many anticancer drugs are evaluated by their ability to inhibit RNA transcription. Here we present a step-by-step protocol for RNA transcription in the presence of known and potential inhibitors. The evaluation of the RNA products of the transcription reaction by gel electrophoresis and UV-Vis spectroscopy provides information on inhibitive properties of potential anticancer drug candidates and, with modifications to the assay, more about their mechanism of action. Little is known about the molecular mechanism of action of corrole cytotoxicity. In this experiment, we consider two corrole compounds: gallium(III) 5,10,15-(tris)pentafluorophenylcorrole (Ga(tpfc)) and freebase analogue 5,10,15-(tris)pentafluorophenylcorrole (tpfc). An RNA transcription assay was used to examine the inhibitive properties of the corroles. Five transcription reactions were prepared: DNA treated with Actinomycin D, triptolide, Ga(tpfc), tpfc at a [complex]:[template DNA base] ratio of 0.01, respectively, and an untreated control. The transcription reactions were analyzed after 4 hr using agarose gel electrophoresis and UV-Vis spectroscopy. There is clear inhibition by Ga(tpfc), Actinomycin D, and triptolide. This RNA transcription assay can be modified to provide more mechanistic detail by varying the concentrations of the anticancer complex, DNA, or polymerase enzyme, or by incubating the DNA or polymerase with the complexes prior to RNA transcription; these modifications would differentiate between an inhibition mechanism involving the DNA or the enzyme. Adding the complex after RNA transcription can be used to test whether the complexes degrade or hydrolyze the RNA. This assay can also be used to study additional anticancer candidates.
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Affiliation(s)
- Grace Y Tang
- Division of Chemistry and Chemical Engineering, California Institute of Technology
| | - Melanie A Pribisko
- Division of Chemistry and Chemical Engineering, California Institute of Technology
| | - Ryan K Henning
- Division of Chemistry and Chemical Engineering, California Institute of Technology
| | - Punnajit Lim
- Department of Molecular Medicine, Beckman Research Institute of the City of Hope
| | - John Termini
- Department of Molecular Medicine, Beckman Research Institute of the City of Hope
| | - Harry B Gray
- Division of Chemistry and Chemical Engineering, California Institute of Technology
| | - Robert H Grubbs
- Division of Chemistry and Chemical Engineering, California Institute of Technology;
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25
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Sarkar M, Daw P, Ghatak T, Bera JK. Amide-Functionalized Naphthyridines on a RhII-RhIIPlatform: Effect of Steric Crowding, Hemilability, and Hydrogen-Bonding Interactions on the Structural Diversity and Catalytic Activity of Dirhodium(II) Complexes. Chemistry 2014; 20:16537-49. [DOI: 10.1002/chem.201402936] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2014] [Indexed: 11/05/2022]
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26
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Patra SC, Weyhermüller T, Ghosh P. Ruthenium, Rhodium, Osmium, and Iridium Complexes of Osazones (Osazones = Bis-Arylhydrazones of Glyoxal): Radical versus Nonradical States. Inorg Chem 2014; 53:2427-40. [DOI: 10.1021/ic4022432] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sarat Chandra Patra
- Department of Chemistry, R. K. Mission Residential College, Narendrapur, Kolkata 103, West Bengal, India
| | - Thomas Weyhermüller
- Max-Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Prasanta Ghosh
- Department of Chemistry, R. K. Mission Residential College, Narendrapur, Kolkata 103, West Bengal, India
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27
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Chartrand D, Hanan GS. Rhodium Amidinate Dimers as Structural and Functional Hubs for Multimetallic Assemblies. Inorg Chem 2013; 53:624-36. [DOI: 10.1021/ic4024585] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Daniel Chartrand
- Department
of Chemistry, Université de Montréal, Montréal, Quebec, H3T 1J4 Canada
| | - Garry S. Hanan
- Department
of Chemistry, Université de Montréal, Montréal, Quebec, H3T 1J4 Canada
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28
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Chen X, Gao F, Yang WY, Zhou ZX, Lin JQ, Ji LN. Structure-activity relationship of polypyridyl ruthenium(II) complexes as DNA intercalators, DNA photocleavage reagents, and DNA topoisomerase and RNA polymerase inhibitors. Chem Biodivers 2013; 10:367-84. [PMID: 23495154 DOI: 10.1002/cbdv.201100414] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2011] [Indexed: 11/08/2022]
Abstract
To investigate the relationship between the molecular structure and biological activity of polypyridyl Ru(II) complexes, such as DNA binding, photocleavage ability, and DNA topoisomerase and RNA polymerase inhibition, six new [Ru(bpy)(2)(dppz)](2+) (bpy=2,2'-bipyridine; dppz=dipyrido[3,2-a:2,',3'-c]phenazine) analogs have been synthesized and characterized by means of (1)H-NMR spectroscopy, mass spectrometry, and elemental analysis. Interestingly, the biological properties of these complexes have been identified to be quite different via a series of experimental methods, such as spectral titration, DNA thermal denaturation, viscosity, and gel electrophoresis. To explain the experimental regularity and reveal the underlying mechanism of biological activity, the properties of energy levels and population of frontier molecular orbitals and excited-state transitions of these complexes have been studied by density-functional theory (DFT) and time-depended DFT (TDDFT) calculations. The results suggest that DNA intercalative ligands with better planarity, greater hydrophobicity, and less steric hindrance are beneficial to the DNA intercalation and enzymatic inhibition of their complexes.
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Affiliation(s)
- Xing Chen
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, State Key Laboratory of Optoelectronic Materials and Technologies, MOE Key Laboratory of Gene Engineering, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, PR China
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29
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Majer Z, Szilvágyi G, Benedek L, Csámpai A, Hollósi M, Vass E. Chelate Structure of a Dirhodium–Amino Acid Complex Identified by Chiroptical and NMR Spectroscopy. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201300057] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Zsuzsa Majer
- Institute of Chemistry, Eötvös Loránd University, 1117 Budapest Pázmány Péter sétány 1/A, Hungary, Fax: +36‐1‐3722592, http://www.chem.elte.hu/departments/kiro/
| | - Gábor Szilvágyi
- Institute of Chemistry, Eötvös Loránd University, 1117 Budapest Pázmány Péter sétány 1/A, Hungary, Fax: +36‐1‐3722592, http://www.chem.elte.hu/departments/kiro/
| | - László Benedek
- Institute of Chemistry, Eötvös Loránd University, 1117 Budapest Pázmány Péter sétány 1/A, Hungary, Fax: +36‐1‐3722592, http://www.chem.elte.hu/departments/kiro/
| | - Antal Csámpai
- Institute of Chemistry, Eötvös Loránd University, 1117 Budapest Pázmány Péter sétány 1/A, Hungary, Fax: +36‐1‐3722592, http://www.chem.elte.hu/departments/kiro/
| | - Miklós Hollósi
- Institute of Chemistry, Eötvös Loránd University, 1117 Budapest Pázmány Péter sétány 1/A, Hungary, Fax: +36‐1‐3722592, http://www.chem.elte.hu/departments/kiro/
| | - Elemér Vass
- Institute of Chemistry, Eötvös Loránd University, 1117 Budapest Pázmány Péter sétány 1/A, Hungary, Fax: +36‐1‐3722592, http://www.chem.elte.hu/departments/kiro/
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30
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Synthesis, structure, DNA interaction and nuclease activity of rhodium(III)–arylazoimidazole complexes. Inorganica Chim Acta 2013. [DOI: 10.1016/j.ica.2012.08.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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31
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Sears RB, Joyce LE, Ojaimi M, Gallucci JC, Thummel RP, Turro C. Photoinduced ligand exchange and DNA binding of cis-[Ru(phpy)(phen)(CH3CN)2]+ with long wavelength visible light. J Inorg Biochem 2012; 121:77-87. [PMID: 23353083 DOI: 10.1016/j.jinorgbio.2012.12.003] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2012] [Revised: 12/02/2012] [Accepted: 12/07/2012] [Indexed: 01/28/2023]
Abstract
The complex cis-[Ru(phpy)(phen)(CH3CN)2](+) (phpy=2-phenylpyridine, phen=1,10-phenanthroline) was investigated as a potential photodynamic therapy (PDT) agent. This complex presents desirable photochemical characteristics including a low energy absorption tail extending into the PDT window (600-850nm) and photoinduced exchange of the CH3CN ligands, generating a species analogous to the chemotherapy drug cisplatin. Furthermore, photochemical reactivity can be controlled through selective irradiation into the Ru-phen singlet metal-to-ligand charge transfer ((1)MLCT) band (λirr=500 nm) of [Ru(phpy)(phen)(CH3CN)2](+) in the presence of excess t-butylammonium chloride (TBACl) resulting in efficient photoinduced production of [Ru(phpy)(phen)(CH3CN)Cl] (Φ=0.25). This lower energy irradiation resulted in greater quantum yield of photosubstitution when compared to direct irradiation into the Ru-phpy (1)MLCT peak (λirr=450 nm; Φ=0.08) in CH2Cl2. It was found that the lower quantum yield observed for irradiation into the Ru→phpy(-)(1)MLCT band results from significant orbital mixing of the phpy(-) ligand with the t2g-type filled set in the metal, giving this state significant ligand-centered character. Lastly, this complex produced a decrease in the mobility of linearized ds-DNA when irradiated with λirr≥420nm, indicative of covalent binding by the transition metal complex similar to that observed for cisplatin. No change in mobility was found for the same samples kept in the dark indicating, unlike cisplatin, DNA binding of cis-[Ru(phpy)(phen)(CH3CN)2](+) only occurs with the activation of light. These observations support the use of cis-[Ru(phpy)(phen)(CH3CN)2](+) as a potential PDT agent by the photoinduced generation of a cisplatin analog.
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Affiliation(s)
- R Bryan Sears
- Department of Chemistry, The Ohio State University, Columbus, OH 43210, USA
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32
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Burya SJ, Palmer AM, Gallucci JC, Turro C. Photoinduced Ligand Exchange and Covalent DNA Binding by Two New Dirhodium Bis-Amidato Complexes. Inorg Chem 2012; 51:11882-90. [DOI: 10.1021/ic3017886] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Scott J. Burya
- Department
of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United
States
| | - Alycia M. Palmer
- Department
of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United
States
| | - Judith C. Gallucci
- Department
of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United
States
| | - Claudia Turro
- Department
of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United
States
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33
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Siu FM, Lin IWS, Yan K, Lok CN, Low KH, Leung TYC, Lam TL, Che CM. Anticancer dirhodium(ii,ii) carboxylates as potent inhibitors of ubiquitin-proteasome system. Chem Sci 2012. [DOI: 10.1039/c2sc00620k] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
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34
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35
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Xu X, Doyle MP. Enantiomer recognition of amides by dirhodium(II) tetrakis[methyl 2-oxopyrrolidine-5(S)-carboxylate]. Inorg Chem 2011; 50:7610-7. [PMID: 21736309 DOI: 10.1021/ic200609u] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Association constants of the chiral dirhodium(II) carboxamidate Rh(2)(5S-MEPY)(4) with Lewis bases including acetonitrile and amides have been determined by UV-vis titration experiments. With chiral lactams and acyclic acetamides in their R- and S-configurations equilibrium constants with chiral dirhodium carboxamidates are measures of chiral differentiation, and equilibrium constant ratios as high as three have been determined. From equilibrium associations with acetamide, N-methylacetamide, and N,N-dimethylacetamide, as well as equilibrium constants for lactams and acyclic amides, higher values occur when both the amide carbonyl oxygen and N-H are bound to Rh(2)(5S-MEPY)(4). This cooperative bonding mode is confirmed by NMR measurements that show a distinctive shift of a N-H absorption, as well as perturbation of the ligands on dirhodium compound, and they suggest N-H association with a ligated oxygen of Rh(2)(5S-MEPY)(4). Measurements were made on the dirhodium(II) compound from which protective axial ligands have been removed to enhance their reliability.
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Affiliation(s)
- Xichen Xu
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
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36
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Gracia R, Adams H, Patmore NJ. Unexpected structural and electronic effects of internal rotation in diruthenium paddlewheel complexes containing bulky carboxylate ligands. Inorganica Chim Acta 2010. [DOI: 10.1016/j.ica.2010.07.024] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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37
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Frade RF, Candeias NR, Duarte CM, André V, Teresa Duarte M, Gois PM, Afonso CA. New dirhodium complex with activity towards colorectal cancer. Bioorg Med Chem Lett 2010; 20:3413-5. [DOI: 10.1016/j.bmcl.2010.04.002] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2010] [Revised: 03/30/2010] [Accepted: 04/05/2010] [Indexed: 01/25/2023]
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38
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Joyce LE, Aguirre JD, Angeles-Boza AM, Chouai A, Fu PKL, Dunbar KR, Turro C. Photophysical Properties, DNA Photocleavage, and Photocytotoxicity of a Series of Dppn Dirhodium(II,II) Complexes. Inorg Chem 2010; 49:5371-6. [DOI: 10.1021/ic100588d] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Lauren E. Joyce
- Department of Chemistry, The Ohio State University, Columbus, Ohio 43210
| | - J. Dafhne Aguirre
- Department of Chemistry, Texas A&M University, College Station, Texas 77843
| | | | - Abdellatif Chouai
- Department of Chemistry, Texas A&M University, College Station, Texas 77843
| | - Patty K.-L. Fu
- Governors State University, University Park, Illinois 60484
| | - Kim R. Dunbar
- Department of Chemistry, Texas A&M University, College Station, Texas 77843
| | - Claudia Turro
- Department of Chemistry, The Ohio State University, Columbus, Ohio 43210
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39
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Chen X, Gao F, Zhou ZX, Yang WY, Guo LT, Ji LN. Effect of ancillary ligands on the topoisomerases II and transcription inhibition activity of polypyridyl ruthenium(II) complexes. J Inorg Biochem 2010; 104:576-82. [DOI: 10.1016/j.jinorgbio.2010.01.010] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2009] [Revised: 01/23/2010] [Accepted: 01/25/2010] [Indexed: 11/16/2022]
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40
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Helix Induction by Dirhodium: Access to Biocompatible Metallopeptides with Defined Secondary Structure. Chemistry 2010; 16:6651-9. [DOI: 10.1002/chem.200903092] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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41
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Aguirre JD, Angeles-Boza AM, Chouai A, Pellois JP, Turro C, Dunbar KR. Live cell cytotoxicity studies: documentation of the interactions of antitumor active dirhodium compounds with nuclear DNA. J Am Chem Soc 2009; 131:11353-60. [PMID: 19624128 DOI: 10.1021/ja9021717] [Citation(s) in RCA: 84] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The promising antitumor activity of dirhodium complexes has been known for over 30 years. There remains, however, a general lack of understanding of their activity in cellulo. In this study, we report the DNA interactions and activity in living cells of six monosubstituted dirhodium(II,II) complexes of general formula [Rh(2)(mu-O(2)CCH(3))(2)(eta(1)-O(2)CCH(3))(L)(CH(3)OH)](+), where L = bpy (2,2'-bipyridine) (1), phen (1,10-phenanthroline) (2), dpq (dipyrido[3,2-f:2',3'-h]quinoxaline) (3), dppz (dipyrido[3,2-a:2',3'-c]phenazine) (4), dppn (benzo[i]dipyrido[3,2-a:2',3'-c]phenazine) (5), and dap (4,7-dihydrodibenzo[de,gh][1,10]phenanthroline) (6). DNA interactions were investigated by UV/visible spectroscopy, relative viscosity measurements, and electrophoretic mobility shift assay. These measurements indicate that compound 5 exhibits the strongest interaction with DNA. Compound 5 also causes the most damage to DNA after cellular internalization, as evaluated by the alkaline comet assay. Compound 5, however, is not the most effective at inhibiting cell viability of the human cancer cells HeLa and COLO-316. The greater hydrophobicity of 5 as compared to that of 4, which is the most effective compound in the series, hinders its ability to reach its cellular target(s). Data from modulation studies of glutathione using N-acetylcysteine and L-buthionine-sulfoximine indicate that changes in glutathione levels do not affect the activity of these particular dirhodium complexes. These results suggest that glutathione is not the only agent involved in the deactivation of these dirhodium complexes.
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Affiliation(s)
- J Dafhne Aguirre
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, USA
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42
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Aguirre JD, Angeles-Boza AM, Chouai A, Turro C, Pellois JP, Dunbar KR. Anticancer activity of heteroleptic diimine complexes of dirhodium: a study of intercalating properties, hydrophobicity and in cellulo activity. Dalton Trans 2009:10806-12. [PMID: 20023910 DOI: 10.1039/b915357h] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The series of complexes cis-[Rh(2)(mu-O(2)CCH(3))(2)(dppn)(L)](2+), where dppn = benzo[i]dipyrido[3,2-a:2',3'-c] phenazine, and L = bpy (2,2'-bipyridine) (1), phen (1,10-phenanthroline) (2), dpq (dipyrido[3,2-f:2',3'-h]quinoxaline) (3), dppz (dipyrido[3,2-a:2',3'-c]phenazine) (4), and dppn (5) were synthesized and their effect on the human cancer cells HeLa and COLO-316 was monitored. Complexes 1 and 2 interact with DNA through intercalation, whereas compounds 3-5 bind only electrostatically. It was found that the dirhodium complex 4 is the most effective compound at inhibiting cell viability of the human cancer cells HeLa and COLO-316. A general conclusion is that the hydrophobicity of the compounds correlates with their in cellulo activity in both cell lines. The ability of the compounds to reach nuclear DNA and form adducts was explored using the comet assay. The results indicate that compounds 1-5 either do not form adducts with DNA that are detrimental to the cell or that they are successfully repaired by the cellular machinery. The results of an annexin V assay indicate that compounds 1-4 trigger apoptosis, whereas compound 5 clearly does not. These findings are significant because they support the contention that dirhodium complexes can be tuned to direct their effect to cellular targets other than nuclear DNA.
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Affiliation(s)
- J Dafhne Aguirre
- Department of Chemistry, Texas A&M University, College Station, TX 77843, USA
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43
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Zaykov A, MacKenzie K, Ball Z. Controlling Peptide Structure with Coordination Chemistry: Robust and Reversible Peptide-Dirhodium Ligation. Chemistry 2009; 15:8961-5. [DOI: 10.1002/chem.200901266] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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44
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Gao F, Chen X, Wang JQ, Chen Y, Chao H, Ji LN. In Vitro Transcription Inhibition by Ruthenium(II) Polypyridyl Complexes with Electropositive Ancillary Ligands. Inorg Chem 2009; 48:5599-601. [DOI: 10.1021/ic900902f] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Feng Gao
- MOE Laboratory of Bioinorganic and Synthetic Chemistry, State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, P. R. China
| | - Xing Chen
- MOE Laboratory of Bioinorganic and Synthetic Chemistry, State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, P. R. China
| | - Jin-Quan Wang
- School of Life Science and Biopharmacology, Guangdong Pharmaceutical University, Guangzhou, 510006, P. R. China
| | - Yu Chen
- MOE Laboratory of Bioinorganic and Synthetic Chemistry, State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, P. R. China
| | - Hui Chao
- MOE Laboratory of Bioinorganic and Synthetic Chemistry, State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, P. R. China
| | - Liang-Nian Ji
- MOE Laboratory of Bioinorganic and Synthetic Chemistry, State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, P. R. China
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45
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Haeubl M, Reith LM, Gruber B, Karner U, Müller N, Knör G, Schoefberger W. DNA interactions and photocatalytic strand cleavage by artificial nucleases based on water-soluble gold(III) porphyrins. J Biol Inorg Chem 2009; 14:1037-52. [PMID: 19471974 DOI: 10.1007/s00775-009-0547-z] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2009] [Accepted: 05/04/2009] [Indexed: 11/28/2022]
Abstract
The novel gold porphyrin complex (5,10,15-tris(N-methylpyridinium-4-yl)-20-(1-pyrenyl)-porphyrinato)gold(III) chloride, [Au(III)(TMPy3Pyr1P)]Cl4, was prepared and characterized by optical spectroscopy, high-resolution nuclear magnetic resonance (NMR), and electrospray mass spectrometry. This cationic multichromophore compound exhibits excellent water solubility and does not form aggregates under physiological conditions. Binding interactions of this complex and related model compounds with nucleic acid substrates have been studied and characterized by NMR and circular dichroism spectroscopy. The photoreactivity of [Au(III)(TMPy3Pyr1P)]Cl4 was investigated under anaerobic and aerobic conditions in the presence of an excess of purine nucleoside, guanosine, and plasmid DNA. Photocatalytic oxidative degradation of guanosine and the change from supercoiled to circular plasmid DNA upon monochromatic irradiation and polychromatic blue-light exposure with a maximum at 420 nm was explored. The potential of the novel water-soluble cationic metallointercalator complex [Au(III)(TMPy3Pyr1P)]Cl4 to serve as a catalytic photonuclease for the cleavage of DNA has been demonstrated.
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Affiliation(s)
- Martin Haeubl
- Institut für Organische Chemie, Johannes Kepler Universität Linz (JKU), Altenberger Str. 69, 4040 Linz, Austria
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46
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Rogachev AY, Petrukhina MA. Insights Into Metal−π Arene Interactions of the Highly Lewis Acidic Rh24+ Core with a Broad Set of π-Ligands: From Ethylene to Corannulene and C60-Fullerene. J Phys Chem A 2009; 113:5743-53. [DOI: 10.1021/jp901271g] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Andrey Yu. Rogachev
- Department of Chemistry, University at Albany, State University of New York, 1400 Washington Avenue, Albany, New York 12222-0100
| | - Marina A. Petrukhina
- Department of Chemistry, University at Albany, State University of New York, 1400 Washington Avenue, Albany, New York 12222-0100
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47
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Aguirre JD, Chifotides HT, Angeles-Boza AM, Chouai A, Turro C, Dunbar KR. Redox-Regulated Inhibition of T7 RNA Polymerase via Establishment of Disulfide Linkages by Substituted Dppz Dirhodium(II,II) Complexes. Inorg Chem 2009; 48:4435-44. [DOI: 10.1021/ic900164j] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- J. Dafhne Aguirre
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, and Department of Chemistry, The Ohio State University, Columbus, Ohio 43210
| | - Helen T. Chifotides
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, and Department of Chemistry, The Ohio State University, Columbus, Ohio 43210
| | - Alfredo M. Angeles-Boza
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, and Department of Chemistry, The Ohio State University, Columbus, Ohio 43210
| | - Abdellatif Chouai
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, and Department of Chemistry, The Ohio State University, Columbus, Ohio 43210
| | - Claudia Turro
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, and Department of Chemistry, The Ohio State University, Columbus, Ohio 43210
| | - Kim R. Dunbar
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, and Department of Chemistry, The Ohio State University, Columbus, Ohio 43210
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48
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Ghosh A, Mandoli A, Kumar DK, Yadav NS, Ghosh T, Jha B, Thomas JA, Das A. DNA binding and cleavage properties of a newly synthesised Ru(II)-polypyridyl complex. Dalton Trans 2009:9312-21. [DOI: 10.1039/b906756f] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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49
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Sadhukhan N, Bera JK. Mixed-Metal Assemblies Involving Ferrocene−Naphthyridine Hybrids. Inorg Chem 2008; 48:978-90. [DOI: 10.1021/ic801586d] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Nabanita Sadhukhan
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208 016, India
| | - Jitendra K. Bera
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208 016, India
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50
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Correlation of Electrochemical Characteristics and Catalytic Activity of Rh2(OAc)4in the Presence of Various Phosphines. B KOREAN CHEM SOC 2008. [DOI: 10.5012/bkcs.2008.29.8.1624] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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