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Ghimire S, Bork MA, Zhang H, Fanwick PE, Zeller M, Choi JH, McMillin DR. DNA binding of Pd(TC3), a conformable cationic porphyrin with a long-lived triplet state. Dalton Trans 2016; 45:14277-84. [PMID: 27534907 DOI: 10.1039/c6dt01918h] [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
The goal of this work has been to synthesize and investigate Pd(TC3), an intercalating porphyrin that has conformable substituents capable of groove binding to B-form DNA. (TC3 denotes the doubly deprotonated form of 5,10,15,20-tetra[3-(3'-methylimidazolium-1'-yl)prop-1-yl]porphyrin.) Palladium(ii) is an apt choice for the central metal ion because it remains strictly four-coordinate and provides for a luminescent triplet excited state with a long lifetime. The DNA hosts are hairpin-forming sequences programmed to differ in base composition. Luminescence, absorbance, and circular dichroism results are consistent with the idea that congruent structural reorganization takes place at the host and ligand during uptake. Photoexcitation of DNA-bound Pd(TC3) generates a comparatively modest steady state concentration of singlet oxygen, due to a relatively slow reaction with molecular oxygen in solution. The sheer size of the substituent groups disfavors quenching, but groove-binding interactions compound the problem by inhibiting mobility. The results show how ligand design affects adduct structure as well as function.
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Affiliation(s)
- Srijana Ghimire
- Department of Chemistry, Purdue University, 560 Oval Dr., West Lafayette, IN 47907, USA.
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Ghimire S, Fanwick PE, McMillin DR. DNA-Binding Studies of a Tetraalkyl-Substituted Porphyrin and the Mutually Adaptive Distortion Principle. Inorg Chem 2014; 53:11108-18. [PMID: 25271570 DOI: 10.1021/ic501683t] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Srijana Ghimire
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United States
| | - Phillip E. Fanwick
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United States
| | - David R. McMillin
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United States
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Gaier AJ, Ghimire S, Fix SE, McMillin DR. Internal Versus External Binding of Cationic Porphyrins to Single-Stranded DNA. Inorg Chem 2014; 53:5467-73. [PMID: 24828700 DOI: 10.1021/ic403105q] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Abby J. Gaier
- Department of Chemistry, Purdue University, 560 Oval Dr., West Lafayette, Indiana 47907, United States
| | - Srijana Ghimire
- Department of Chemistry, Purdue University, 560 Oval Dr., West Lafayette, Indiana 47907, United States
| | - Sarah E. Fix
- Department of Chemistry, Purdue University, 560 Oval Dr., West Lafayette, Indiana 47907, United States
| | - David R. McMillin
- Department of Chemistry, Purdue University, 560 Oval Dr., West Lafayette, Indiana 47907, United States
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Briggs BN, Gaier AJ, Fanwick PE, Dogutan DK, McMillin DR. Cationic Copper(II) Porphyrins Intercalate into Domains of Double-Stranded RNA. Biochemistry 2012; 51:7496-505. [PMID: 22947040 DOI: 10.1021/bi300828z] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Breeze N. Briggs
- Purdue University, 560 Oval Drive, West
Lafayette, Indiana 47907, United States
| | - Abby J. Gaier
- Purdue University, 560 Oval Drive, West
Lafayette, Indiana 47907, United States
| | - Phillip E. Fanwick
- Purdue University, 560 Oval Drive, West
Lafayette, Indiana 47907, United States
| | - Dilek K. Dogutan
- Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts
02139, United States
| | - David R. McMillin
- Purdue University, 560 Oval Drive, West
Lafayette, Indiana 47907, United States
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Zhang M, Powell HV, Mackenzie SR, Unwin PR. Kinetics of porphyrin adsorption and DNA-assisted desorption at the silica-water interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:4004-4012. [PMID: 20104901 DOI: 10.1021/la903438p] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Evanescent wave cavity ring-down spectroscopy (EW-CRDS) has been used to study in situ the kinetics of the adsorption of 5,10,15,20-tetrakis(4-N-methylpyridiniumyl)porphyrin (TMPyP) from pH 7.4 phosphate buffer solution (PBS) to the silica-water interface and the interaction of calf thymus DNA (CT-DNA) with the resulting TMPyP-functionalized surface. TMPyP was delivered to the silica surface using an impinging jet technique to allow relatively fast surface kinetics to be accessed. Adsorption was first-order in TMPyP, and the initial adsorption rate constant at the bare surface was found to be k = (4.1 +/- 0.6) x 10(-2) cm s(-1). A deceleration in the adsorption kinetics was observed at longer times that could be described semiquantitatively using an Elovich-type kinetic expression. The limiting value of the absorbance corresponded approximately to monolayer coverage (6.2 x 10(13) molecules cm(-2)). Exposure of the TMPyP-modified silica surface to CT-DNA, achieved by flowing CT-DNA solution over the functionalized surface, resulted in efficient desorption of the TMPyP. The desorption process was driven by the interaction of TMPyP with CT-DNA, which UV-vis spectroscopy indicated involved intercalative binding. The desorption kinetics were also simulated using complementary finite element modeling of convection-diffusion coupled to a surface process.
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Affiliation(s)
- Meiqin Zhang
- Department of Chemistry, University of Warwick, Coventry CV4 7AL, United Kingdom
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Dehghanpour S, Fotouhi L, Amini MM, Khavasi HR, Jahani KH, Nouroozi F, Zamanifar E. Synthesis and characterization of [Cu(mb2en)2]ClO4 and [Cu(mb2en)(PPh3)2]BPh4: crystal structure of [Cu(mb2en)2]ClO4. J COORD CHEM 2008. [DOI: 10.1080/00958970701360717] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Saeed Dehghanpour
- a Department of Chemistry , Alzahra University , Tehran 1993891176, Iran
| | - Lida Fotouhi
- a Department of Chemistry , Alzahra University , Tehran 1993891176, Iran
| | | | - Hamid Reza Khavasi
- b Department of Chemistry , Shahid Beheshti University , Evin, Tehran 1983963113, Iran
| | - KHadijeh Jahani
- a Department of Chemistry , Alzahra University , Tehran 1993891176, Iran
| | - Fatemeh Nouroozi
- a Department of Chemistry , Alzahra University , Tehran 1993891176, Iran
| | - Elham Zamanifar
- a Department of Chemistry , Alzahra University , Tehran 1993891176, Iran
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Andrews K, McMillin DR. A Pared-Down Version of 5,10,15,20-Tetra(N-methylpyridinium-4-yl)porphyrin Intercalates into B-Form DNA Regardless of Base Composition: Binding Studies of Tri(N-methylpyridinium-4-yl)porphyrins. Biochemistry 2008; 47:1117-25. [PMID: 18171084 DOI: 10.1021/bi7018755] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Kim Andrews
- Department of Chemistry, 560 Oval Drive, Purdue University, West Lafayette, Indiana 47907-2084
| | - David R. McMillin
- Department of Chemistry, 560 Oval Drive, Purdue University, West Lafayette, Indiana 47907-2084
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Affiliation(s)
- Guy A Hembury
- Japan Science and Technology Agency and Department of Applied Chemistry, Osaka University, 2-1 Yamada-oka, Suita 565-0871, Japan
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Evans SE, Mendez MA, Turner KB, Keating LR, Grimes RT, Melchoir S, Szalai VA. End-stacking of copper cationic porphyrins on parallel-stranded guanine quadruplexes. J Biol Inorg Chem 2007; 12:1235-49. [PMID: 17786488 DOI: 10.1007/s00775-007-0292-0] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2007] [Accepted: 08/12/2007] [Indexed: 12/16/2022]
Abstract
Nucleic acids that contain multiple sequential guanines assemble into guanine quadruplexes (G-quadruplexes). Drugs that induce or stabilize G-quadruplexes are of interest because of their potential use as therapeutics. Previously, we reported on the interaction of the Cu(2+) derivative of 5,10,15,20-tetrakis(1-methyl-4-pyridyl)-21H,23H-porphine (CuTMpyP4), with the parallel-stranded G-quadruplexes formed by d(T(4)G( n )T(4)) (n = 4 or 8) (Keating and Szalai in Biochemistry 43:15891-15900, 2004). Here we present further characterization of this system using a series of guanine-rich oligonucleotides: d(T(4)G( n )T(4)) (n = 5-10). Absorption titrations of CuTMpyP4 with all d(T(4)G( n )G(4)) quadruplexes produce approximately the same bathochromicity (8.3 +/- 2 nm) and hypochromicity (46.2-48.6%) of the porphyrin Soret band. Induced emission spectra of CuTMpyP4 with d(T(4)G( n )T(4))(4) quadruplexes indicate that the porphyrin is protected from solvent. Electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry revealed a maximum porphyrin to quadruplex stoichiometry of 2:1 for the shortest (n = 4) and longest (n = 10) quadruplexes. Electron paramagnetic resonance spectroscopy shows that bound CuTMpyP4 occupies magnetically noninteracting sites on the quadruplexes. Consistent with our previous model for d(T(4)G(4)T(4)), we propose that two CuTMpyP4 molecules are externally stacked at each end of the run of guanines in all d(T(4)G( n )T(4)) (n = 4-10) quadruplexes.
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Affiliation(s)
- Sarah E Evans
- Department of Chemistry and Biochemistry, University of Maryland-Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USA
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Shelton AH, Rodger A, McMillin DR. DNA binding studies of a new dicationic porphyrin. Insights into interligand interactions. Biochemistry 2007; 46:9143-54. [PMID: 17630777 DOI: 10.1021/bi700293g] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Cationic porphyrins have an affinity for DNA and potential for applications in the fields of photodynamic therapy and cellular imaging. This report describes a new dicationic porphyrin, 5,15-dimethyl-10,20-di(N-methylpyridinium-4-yl)porphyrin, abbreviated H2tMe2D4. Although tetrasubstituted, H2tMe2D4 presents modest steric requirements and forms in reasonable yield by a "2+2" synthetic method. Accordingly, studies of the zinc(II)- and copper(II)-containing derivatives, Zn(tMe2D4) and Cu(tMe2D4), have also been possible. Methods used to characterize DNA-binding motifs include absorption, emission, linear, and circular dichroism spectroscopies, as well as viscometry. An unusually detailed picture of porphyrin uptake emerges. As the ratio of DNA to porphyrin increases during a typical titration, H2tMe2D4 or Cu(tMe2D4) initially aggregates on the host and then shifts to intercalative binding at close quarters before finally dispersing into non-interacting intercalation sites of the host. Emission studies of the copper(II) porphyrin have been very valuable. The existence of a measurable signal is diagnostic of intercalative binding, and the saturation behavior establishes that internalization typically monopolizes approximately three base pairs. In the moderate loading regime, emission data are most telling because dipole-dipole interactions between near-neighbor porphyrins tend to confuse other spectroscopic assays. The third ligand, Zn(tMe2D4), behaves differently in that the uptake is a strictly cooperative process. The mode of binding also varies with the base content of the DNA host. When the DNA is rich in A=T base pairs, the porphyrin remains five-coordinate and binds externally; however, Zn(tMe2D4) loses its axial ligand and binds by intercalation if the host contains only G[triple bond]C base pairs.
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Affiliation(s)
- Alexander H Shelton
- Department of Chemistry, 560 Oval Drive, Purdue University, West Lafayette, Indiana 47907-2084, USA
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McMillin DR, Shelton AH, Bejune SA, Fanwick PE, Wall RK. Understanding binding interactions of cationic porphyrins with B-form DNA. Coord Chem Rev 2005. [DOI: 10.1016/j.ccr.2004.11.016] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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12
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Lainé M, Richard F, Tarnaud E, Bied-Charreton C, Verchère-Béaur C. Synthesis of novel types of copper-bipyridyl porphyrins and characterization of their interactions and reactivity with DNA. J Biol Inorg Chem 2004; 9:550-62. [PMID: 15156371 DOI: 10.1007/s00775-004-0550-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2003] [Accepted: 04/14/2004] [Indexed: 12/01/2022]
Abstract
The inherent ability to interact with DNA makes cationic metallo-porphyrins attractive targets as antitumor drugs. Many studies describe their interaction with DNA and the mechanism by which they induce DNA cleavage. Since porphyrins can be used as anchors for chemically reactive groups, it is possible to modify them to generate a family of compounds with specific functions. In the present work, we used chemical groups such as copper-bipyridinium (Cu-bpy), which hydrolyze phosphodiester bonds, and a porphyrin core to synthesize two novel Cu(2)-bpy-porphyrins. Their interactions with DNA have been characterized using classic spectroscopic methods, and their oxidative and hydrolytic reactivity toward supercoiled plasmid DNA has been studied in vitro. Our results show that Cu(2)-bpy-porphyrins interact with DNA via external association and intercalation and that their ability to cleave DNA and the mechanisms depends on the experimental conditions.
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Affiliation(s)
- M Lainé
- Laboratoire de Chimie Bioorganique et Bioinorganique, Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris XI Orsay, 91405 Orsay cedex, France.
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Kubát P, Lang K, Král V, Anzenbacher P. Preprogramming of Porphyrin−Nucleic Acid Assemblies via Variation of the Alkyl/Aryl Substituents of Phosphonium Tetratolylporphyrins. J Phys Chem B 2002. [DOI: 10.1021/jp014405x] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Pavel Kubát
- J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, 182 23 Praha 8, Czech Republic, Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, 250 68 Řež, Czech Republic, Institute of Chemical Technology at Prague, 166 28 Praha 6, Czech Republic, and Department of Chemistry and Center for Photochemical Sciences, Overman Hall, Bowling Green State University, Bowling Green, Ohio 43403
| | - Kamil Lang
- J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, 182 23 Praha 8, Czech Republic, Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, 250 68 Řež, Czech Republic, Institute of Chemical Technology at Prague, 166 28 Praha 6, Czech Republic, and Department of Chemistry and Center for Photochemical Sciences, Overman Hall, Bowling Green State University, Bowling Green, Ohio 43403
| | - Vladimír Král
- J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, 182 23 Praha 8, Czech Republic, Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, 250 68 Řež, Czech Republic, Institute of Chemical Technology at Prague, 166 28 Praha 6, Czech Republic, and Department of Chemistry and Center for Photochemical Sciences, Overman Hall, Bowling Green State University, Bowling Green, Ohio 43403
| | - Pavel Anzenbacher
- J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, 182 23 Praha 8, Czech Republic, Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, 250 68 Řež, Czech Republic, Institute of Chemical Technology at Prague, 166 28 Praha 6, Czech Republic, and Department of Chemistry and Center for Photochemical Sciences, Overman Hall, Bowling Green State University, Bowling Green, Ohio 43403
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Okada H, Imai H, Uemori Y. Intercalation of water-soluble bis-porphyrins into poly(dA)-poly(dT) double helix. Bioorg Med Chem 2001; 9:3301-7. [PMID: 11711306 DOI: 10.1016/s0968-0896(01)00239-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The association constants (K) of nucleic acid monomers with a series of water-soluble bis-porphyrins (bisMC1, bisMC3, bisMC5, bisMC7, and bisMC11) in which two porphyrin units were linked by a methylene chain of various lengths were estimated spectrophotometrically. Among the bis-porphyrins, the K values are similar for each nucleic acid monomer, indicating that the bridging chain length does not affect the association of the bis-porphyrins with the nucleic acid monomers. The melting curves of poly(dA)-poly(dT) in the presence of bisMC3 or bisMC5 were found to be biphasic, suggesting that bisMC3 and bisMC5 are bound to poly(dA)-poly(dT) with a binding mode different from the groove binding exhibited by the corresponding porphyrin monomers. A negative-induced CD peak in the Soret region of bisMC3 and bisMC5 with poly(dA)-poly(dT) is observed and the visible spectral changes of bisMC3 and bisMC5 upon addition of poly(dA)-poly(dT) are accompanied by a large red shift of the Soret band (bisMC3: 21 nm, bisMC5: 23 nm) with substantial hypochromicity (bisMC3: 49%, bisMC5: 40%). Therefore, it is reasonable to conclude that both of the porphyrin units of bisMC3 and bisMC5 intercalate into poly(dA)-poly(dT). In contrast to poly(dA)-poly(dT), the melting curves of poly(dA.dT)(2) in the presence of the bis-porphyrins did not show such biphasic behavior. Together with the CD and visible absorption data, it is certain that these bis-porphyrins do not intercalate into poly(dA.dT)(2).
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Affiliation(s)
- H Okada
- Faculty of Pharmaceutical Sciences, Hokuriku University, 3-Ho, Kanagawa-Machi, Kanazawa, 920-1181, Japan.
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Thomas KE, McMillin DR. Competitive Binding Studies of H2T4 with DNA Hairpins (H2T4 = meso-Tetrakis(4-(N-methylpyridiniumyl))porphyrin). J Phys Chem B 2001. [DOI: 10.1021/jp011860k] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Keith E. Thomas
- Department of Chemistry, 1393 Brown Building, Purdue University, West Lafayette, Indiana 47907-1393
| | - David R. McMillin
- Department of Chemistry, 1393 Brown Building, Purdue University, West Lafayette, Indiana 47907-1393
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Five-coordinate complex formation and luminescence quenching study of copper(II) porphyrins. Inorganica Chim Acta 2001. [DOI: 10.1016/s0020-1693(01)00620-x] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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17
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Kruglik SG, Mojzes P, Mizutani Y, Kitagawa T, Turpin PY. Time-Resolved Resonance Raman Study of the Exciplex Formed between Excited Cu−Porphyrin and DNA. J Phys Chem B 2001. [DOI: 10.1021/jp004207q] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Sergei G. Kruglik
- Institute for Molecular Science, Okazaki National Research Institutes, Nishigonaka 38, Myodaiji, Okazaki, Aichi 444-8585, Japan, B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, F. Skaryna Ave. 70, Minsk 220072, Belarus, Institute of Physics, Charles University, Ke Karlovu 5, CS-12116 Prague 2, Czech Republic, and LPBC, CNRS ESA 7033, Université Pierre et Marie Curie, Case Courrier 138, 4 Place Jussieu, 75252 Paris Cedex 05, France
| | - Peter Mojzes
- Institute for Molecular Science, Okazaki National Research Institutes, Nishigonaka 38, Myodaiji, Okazaki, Aichi 444-8585, Japan, B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, F. Skaryna Ave. 70, Minsk 220072, Belarus, Institute of Physics, Charles University, Ke Karlovu 5, CS-12116 Prague 2, Czech Republic, and LPBC, CNRS ESA 7033, Université Pierre et Marie Curie, Case Courrier 138, 4 Place Jussieu, 75252 Paris Cedex 05, France
| | - Yasuhisa Mizutani
- Institute for Molecular Science, Okazaki National Research Institutes, Nishigonaka 38, Myodaiji, Okazaki, Aichi 444-8585, Japan, B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, F. Skaryna Ave. 70, Minsk 220072, Belarus, Institute of Physics, Charles University, Ke Karlovu 5, CS-12116 Prague 2, Czech Republic, and LPBC, CNRS ESA 7033, Université Pierre et Marie Curie, Case Courrier 138, 4 Place Jussieu, 75252 Paris Cedex 05, France
| | - Teizo Kitagawa
- Institute for Molecular Science, Okazaki National Research Institutes, Nishigonaka 38, Myodaiji, Okazaki, Aichi 444-8585, Japan, B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, F. Skaryna Ave. 70, Minsk 220072, Belarus, Institute of Physics, Charles University, Ke Karlovu 5, CS-12116 Prague 2, Czech Republic, and LPBC, CNRS ESA 7033, Université Pierre et Marie Curie, Case Courrier 138, 4 Place Jussieu, 75252 Paris Cedex 05, France
| | - Pierre-Yves Turpin
- Institute for Molecular Science, Okazaki National Research Institutes, Nishigonaka 38, Myodaiji, Okazaki, Aichi 444-8585, Japan, B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, F. Skaryna Ave. 70, Minsk 220072, Belarus, Institute of Physics, Charles University, Ke Karlovu 5, CS-12116 Prague 2, Czech Republic, and LPBC, CNRS ESA 7033, Université Pierre et Marie Curie, Case Courrier 138, 4 Place Jussieu, 75252 Paris Cedex 05, France
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Temperature dependence study of five-coordinate complex formation of zinc(II) octaethyl and tetraphenylporphyrin. Inorganica Chim Acta 2000. [DOI: 10.1016/s0020-1693(00)00280-2] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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19
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Anderson ME, Barrett AGM, Hoffman BM. Super-Charged Porphyrazines: Synthesis and Physical Properties of Octacationic Tetraazaporphyrins. Inorg Chem 1999; 38:6143-6151. [PMID: 11671325 DOI: 10.1021/ic990410s] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
We report the synthesis of octacationic macrocycles based on the porphyrazine (tetraazaporphyrin) core. The first stage is the synthesis of Mg(II) 2,3,7,8,12,13,17,18-octakis(4-pyridyl)porphyrazine, [Mgpz(pyr)(8)], and the parent [H(2)pz(pyr)(8)]. Both compounds are freely soluble in aqueous acid due to protonation of the pyridyl groups but with concomitant loss of Mg(2+) by the latter. Methylation of [H(2)pz(pyr)(8)] gives the octacation, 2,3,7,8,12,13,17,18-octakis(N-methyl-4-pyridiniumyl)porphyrazine, [H(2)pz(Me-pyr)(8)](8+), which is freely soluble in water as the chloride salt. The peripheral charges greatly lower the pK(a) values of the pyrrole protons of [H(2)pz(Me-pyr)(8)](8+) in aqueous solution. Global fitting of optical pH titration curves gives pK(a) values for the first and second deprotonations of 6.3 and 8.8 in 2.0 M NaCl and 4.1 and 5.6 at 0.1 M NaCl. The analysis further gives the UV-visible spectra of the [H(2)pz(Me-pyr)(8)](8+), [Hpz(Me-pyr)(8)](7+), and [pz(Me-pyr)(8)](6+) species. The free-base compound [H(2)pz(Me-pyr)(8)](8+) rapidly incorporates a variety of metal ions (Ba(II), Cd(II), Co(II), Cu(II), Mn(III), Ni(II), Pd(II), and Zn(II)) to form [Mpz(Me-pyr)(8)](8+). We present the complete synthesis and characterization of the [Nipz(Me-pyr)(8)](8+) and [Cupz(Me-pyr)(8)](8+) derivatives.
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Affiliation(s)
- Máirín E. Anderson
- Departments of Chemistry, Northwestern University, Evanston, Illinois 60208, and Imperial College of Science, Technology and Medicine, London, England
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Chirvony VS, Galievsky VA, Terekhov SN, Dzhagarov BM, Ermolenkov VV, Turpin PY. Binding of the cationic 5-coordinate Zn(II)-5,10,15,20-tetrakis(4-N-methylpyridyl)porphyrin to DNA and model polynucleotides: Ionic-strength dependent intercalation in [poly(dG-dC)]2. ACTA ACUST UNITED AC 1999. [DOI: 10.1002/(sici)1520-6343(1999)5:5<302::aid-bspy5>3.0.co;2-n] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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