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Das M, Srinivasan A. Advent and features of pyriporphyrinoids: an overview of a pyridine-based porphyrin analogue. Chem Commun (Camb) 2023; 59:11780-11790. [PMID: 37705415 DOI: 10.1039/d3cc03139j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/15/2023]
Abstract
Pyriporphyrinoids have recently attracted a significant proliferation of attention due to their versatile characters, which stem from structural motifs in which the pyridine moiety is involved. The evolution of pyriporphyrin chemistry revealed the subtle modifications of the macrocyclic core that tweak the electronic structure as compared to the parental macrocycle. The amendment of π-electronic organization inside the core manifests exceptional photophysical and coordination properties that cover a vast range of seemingly contradictory fields. In fundamental chemistry, the pyridine unit acts as a modulator of π-conjugated porphyrinoid systems, resulting in aromaticity swapping. From the applied chemistry perspective, these macrocycles are primarily utilized as (i) sensors, (ii) NIR absorbing photoacoustic dyes, (iii) electrochemical catalysts, (iv) singlet biradicaloid generation and (v) contributors to generate metal complexes with intriguing binding modes. Surprisingly, despite their prominence, pyriporphyrinoids are inadequately investigated, while pyridine unit-embedded calixphyrin, calixpyridinopyrrole and calixpyridine are barely reported. This review article illustrates the controlled formation of specific porphyrinic scaffolds with pyridine unit(s) and diverse functionalized heterocyclic and/or carbocyclic building block(s), and demonstrates a substantial influence on the macrocyclic properties.
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Affiliation(s)
- Mainak Das
- National Institute of Science Education and Research (NISER), An OCC of Homi Bhabha National Institute, Bhubaneswar 752050, Odisha, India.
- Department of Chemistry, Jagiellonian University, 30-387 Kraków, Poland
| | - A Srinivasan
- National Institute of Science Education and Research (NISER), An OCC of Homi Bhabha National Institute, Bhubaneswar 752050, Odisha, India.
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2
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Organometallic Chemistry within the Structured Environment Provided by the Macrocyclic Cores of Carbaporphyrins and Related Systems. Molecules 2023; 28:molecules28031496. [PMID: 36771158 PMCID: PMC9920839 DOI: 10.3390/molecules28031496] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2023] [Revised: 01/27/2023] [Accepted: 01/30/2023] [Indexed: 02/08/2023] Open
Abstract
The unique environment within the core of carbaporphyrinoid systems provides a platform to explore unusual organometallic chemistry. The ability of these structures to form stable organometallic derivatives was first demonstrated for N-confused porphyrins but many other carbaporphyrin-type systems were subsequently shown to exhibit similar or complementary properties. Metalation commonly occurs with catalytically active transition metal cations and the resulting derivatives exhibit widely different physical, chemical and spectroscopic properties and range from strongly aromatic to nonaromatic and antiaromatic species. Metalation may trigger unusual, highly selective, oxidation reactions. Alkyl group migration has been observed within the cavity of metalated carbaporphyrins, and in some cases ring contraction of the carbocyclic subunit takes place. Over the past thirty years, studies in this area have led to multiple synthetic routes to carbaporphyrinoid ligands and remarkable organometallic chemistry has been reported. An overview of this important area is presented.
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Thuita DW, Brückner C. Metal Complexes of Porphyrinoids Containing Nonpyrrolic Heterocycles. Chem Rev 2022; 122:7990-8052. [PMID: 35302354 DOI: 10.1021/acs.chemrev.1c00694] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The replacement of one or more pyrrolic building block(s) of a porphyrin by a nonpyrrolic heterocycle leads to the formation of so-called pyrrole-modified porphyrins (PMPs), porphyrinoids of broad structural variability. The wide range of coordination environments (type, number, charge, and architecture of the donor atoms) that the pyrrole-modified frameworks provide to the central metal ions, the frequent presence of donor atoms at their periphery, and their often observed nonplanarity or conformational flexibility distinguish the complexes of the PMPs clearly from those of the traditional square-planar, dianionic, N4-coordinating (hydro)porphyrins. Their different coordination properties suggest their utilization in areas beyond which regular metalloporphyrins are suitable. Following a general introduction to the synthetic methodologies available to generate pyrrole-modified porphyrins, their general structure, history, coordination chemistry, and optical properties, this Review highlights the chemical, electronic (optical), and structural differences of specific classes of metalloporphyrinoids containing nonpyrrolic heterocycles. The focus is on macrocycles with similar "tetrapyrrolic" architectures as porphyrins, thusly excluding the majority of expanded porphyrins. We highlight the relevance and application of these metal complexes in biological and technical fields as chemosensors, catalysts, photochemotherapeutics, or imaging agents. This Review provides an introduction to the field of metallo-PMPs as well as a comprehensive snapshot of the current state of the art of their synthesis, structures, and properties. It also aims to provide encouragement for the further study of these intriguing and structurally versatile metalloporphyrinoids.
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Affiliation(s)
- Damaris Waiyigo Thuita
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269-3060, United States
| | - Christian Brückner
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269-3060, United States
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Toganoh M, Furuta H. Creation from Confusion and Fusion in the Porphyrin World─The Last Three Decades of N-Confused Porphyrinoid Chemistry. Chem Rev 2022; 122:8313-8437. [PMID: 35230807 DOI: 10.1021/acs.chemrev.1c00065] [Citation(s) in RCA: 34] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Confusion is a novel concept of isomerism in porphyrin chemistry, delivering a steady stream of new chemistry since the discovery of N-confused porphyrin, a porphyrin mutant, in 1994. These days, the number of confused porphyrinoids is increasing, and confusion and associated fusion are found in various fields such as supramolecular chemistry, materials chemistry, biological chemistry, and catalysts. In this review, the birth and growth of confused porphyrinoids in the last three decades are described.
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Affiliation(s)
- Motoki Toganoh
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Hiroyuki Furuta
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
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Das M, Adinarayana B, Srinivasan A. Recent Advances in the Design and Syntheses of Porphyrinoids by Embedding Higher Analogues of Arene and Pyridine Units. ACS OMEGA 2021; 6:35204-35212. [PMID: 34984253 PMCID: PMC8717398 DOI: 10.1021/acsomega.1c05444] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Accepted: 11/26/2021] [Indexed: 06/07/2023]
Abstract
Due to enthralling applications in various fields and augmenting fundamental wisdom, π-conjugated macrocycles in general and porphyrin systems in particular are constantly explored. Subtle modifications of porphyrin structure can amend the rudimentary properties. Pursuing innovative properties provides impetus to underpin arene or pyridine moiety embedded porphyrin derivatives. There have been several reviews related to arene incorporated carbaporphyrinoids; however, recent developments of porphyrin analogues by introducing higher analogues of arenes and pyridine units are not adequately inspected. This mini-review mainly focuses on biphenyl, bipyridine, terphenyl, and mixed arene pyridine embedded porphyrin analogues and their coordination chemistry.
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Affiliation(s)
- Mainak Das
- Department
of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Kraków, Poland
| | - B. Adinarayana
- Department
of Chemistry, Imperial College London, 80 Wood Lane, London W12 7TA, United
Kingdom
| | - A. Srinivasan
- School
of Chemical Sciences, National Institute
of Science Education and Research (NISER), HBNI, Bhubaneswar 752050, Odisha, India
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Das M, Singh D, Chitranshi S, Murugavel M, Srinivasan A. N‐Confused Pyritriphyrin: A New Class of Triphyrin and Its Calixphyrin Analogue. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100891] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Mainak Das
- School of chemical sciences National Institute of Science Education and Research (NISER), HBNI Bhubaneswar 752050 Odisha India
| | - Deepak Singh
- School of chemical sciences National Institute of Science Education and Research (NISER), HBNI Bhubaneswar 752050 Odisha India
| | - Sangya Chitranshi
- School of chemical sciences National Institute of Science Education and Research (NISER), HBNI Bhubaneswar 752050 Odisha India
| | - M. Murugavel
- School of chemical sciences National Institute of Science Education and Research (NISER), HBNI Bhubaneswar 752050 Odisha India
| | - A. Srinivasan
- School of chemical sciences National Institute of Science Education and Research (NISER), HBNI Bhubaneswar 752050 Odisha India
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Rawat N, Thorat KG, Kumar S, Ravikanth M. Synthesis of Expanded Hetero 2,6-Pyrihexaphyrins. European J Org Chem 2020. [DOI: 10.1002/ejoc.201901766] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Nisha Rawat
- Indian Institute of Technology; 400076 Powai Mumbai India
| | | | - Sunit Kumar
- Indian Institute of Technology; 400076 Powai Mumbai India
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8
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A Pincer Motif Etched into a meta-Benziporphyrin Frame. TOP ORGANOMETAL CHEM 2020. [DOI: 10.1007/3418_2020_61] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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9
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Wang Q, Song M, Song X, Bu Y. Unexpected diradical character and large magnetic spin coupling in modified porphyrins induced by inverting pyrrole rings. Phys Chem Chem Phys 2019; 21:17209-17220. [PMID: 31343647 DOI: 10.1039/c9cp02691f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Porphyrin derivatives with inverted pyrrole rings have been experimentally synthesized, and their relevant electronic and magnetic properties have great application prospects in terms of electronic devices. In this work, we rationally design the structures and computationally investigate the electronic properties of porphine and Mg/Zn-porphyrin derivatives with two inverted pyrrole rings, i.e. the dipyrrole-inverted porphine and Mg/Zn-porphyrin analogues (1NN-2H, 2NN-2H, 1NN-Mg, 2NN-Mg, 1NN-Zn and 2NN-Zn), at the B3LYP/6-311G(d,p) level. The main structural characters of these porphyrin derivatives are that the [double bond splayed left]NH units of two pyrrole rings are inverted outwards and the porphyrin-like macrocycles are distorted from square to diamond shapes. More interestingly, these dipyrrole-inverted porphyrin derivatives present diradical characters with noticeably large antiferromagnetic spin coupling constants, i.e.-982.2/-936.3 cm-1 for 1NN-2H/2NN-2H, -796.3/-764.2 cm-1 for 1NN-Mg/2NN-Mg and -1044.5/-1055.2 cm-1 for 1NN-Zn/2NN-Zn, but their monopyrrole-inverted counterparts do not. Examinations of the orbital properties featuring large occupation numbers of the lowest unoccupied natural orbitals and two singly occupied molecular orbitals that are polarized in opposite directions also confirm these findings. These porphyrin derivatives have small singlet-triplet energy gaps and small energy gaps between the highest occupied molecular orbital and lowest unoccupied molecular orbital of the closed-shell singlet states. These are conducive to the emergence of diradical character and large spin coupling constants. Furthermore, the spin-alternation analyses show that each dipyrrole-inverted porphyrin derivative has two resonant structures featuring two spin-opposite single electrons, in agreement with the observed antiferromagnetic spin couplings. This work provides novel insights into the electronic structures and properties of the porphyrin derivatives with modified structures and also provides helpful information for the rational design, synthesis and characterization of new porphyrin-based magnets.
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Affiliation(s)
- Qi Wang
- School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, People's Republic of China.
| | - Meiyu Song
- School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, People's Republic of China.
| | - Xinyu Song
- School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, People's Republic of China.
| | - Yuxiang Bu
- School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, People's Republic of China.
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Affiliation(s)
- Timothy D. Lash
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
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11
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Abebayehu A, Dutta R, Lee CH. Synthesis, Characterization and Properties of Expanded Pyriporphyrins: A New Family of Alkylidenyl Porphyrin Homologues Bearing meso
-Exocyclic Double Bonds. Chemistry 2016; 22:13850-13856. [DOI: 10.1002/chem.201602136] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2016] [Indexed: 11/11/2022]
Affiliation(s)
- Abeje Abebayehu
- Department of Chemistry; Kangwon National University; Chuncheon 200-701 Korea
| | - Ranjan Dutta
- Department of Chemistry; Kangwon National University; Chuncheon 200-701 Korea
| | - Chang-Hee Lee
- Department of Chemistry; Kangwon National University; Chuncheon 200-701 Korea
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12
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Abebayehu A, Park D, Hwang S, Dutta R, Lee CH. Synthesis and spectroscopic behaviour of metal complexes of meso-alkylidenyl carbaporphyrinoids and their expanded analogues. Dalton Trans 2016; 45:3093-101. [DOI: 10.1039/c5dt04566e] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Metal complexes of meso-diethyl malonylidene carbaporphyrinoids have been synthesized and fully characterized.
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Affiliation(s)
- Abeje Abebayehu
- Department of Chemistry Kangwon National University
- Chuncheon
- Korea
| | - Dowoo Park
- Department of Chemistry Kangwon National University
- Chuncheon
- Korea
| | - Seonah Hwang
- Department of Chemistry Kangwon National University
- Chuncheon
- Korea
| | - Ranjan Dutta
- Department of Chemistry Kangwon National University
- Chuncheon
- Korea
| | - Chang-Hee Lee
- Department of Chemistry Kangwon National University
- Chuncheon
- Korea
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13
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Adinarayana B, Thomas AP, Yadav P, Kumar A, Srinivasan A. Bipyricorrole: A Corrole Homologue with a Monoanionic Core as a Fluorescence ZnII
Sensor. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201508829] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- B. Adinarayana
- School of Chemical Sciences; National Institute of Science Education and Research (NISER); Bhubaneswar - 751005 Odisha India
| | - Ajesh P. Thomas
- School of Chemical Sciences; National Institute of Science Education and Research (NISER); Bhubaneswar - 751005 Odisha India
| | - Prerna Yadav
- School of Chemical Sciences; National Institute of Science Education and Research (NISER); Bhubaneswar - 751005 Odisha India
| | - Arun Kumar
- School of Chemical Sciences; National Institute of Science Education and Research (NISER); Bhubaneswar - 751005 Odisha India
| | - A. Srinivasan
- School of Chemical Sciences; National Institute of Science Education and Research (NISER); Bhubaneswar - 751005 Odisha India
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14
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Adinarayana B, Thomas AP, Yadav P, Kumar A, Srinivasan A. Bipyricorrole: A Corrole Homologue with a Monoanionic Core as a Fluorescence ZnII
Sensor. Angew Chem Int Ed Engl 2015; 55:969-73. [DOI: 10.1002/anie.201508829] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2015] [Revised: 11/05/2015] [Indexed: 01/08/2023]
Affiliation(s)
- B. Adinarayana
- School of Chemical Sciences; National Institute of Science Education and Research (NISER); Bhubaneswar - 751005 Odisha India
| | - Ajesh P. Thomas
- School of Chemical Sciences; National Institute of Science Education and Research (NISER); Bhubaneswar - 751005 Odisha India
| | - Prerna Yadav
- School of Chemical Sciences; National Institute of Science Education and Research (NISER); Bhubaneswar - 751005 Odisha India
| | - Arun Kumar
- School of Chemical Sciences; National Institute of Science Education and Research (NISER); Bhubaneswar - 751005 Odisha India
| | - A. Srinivasan
- School of Chemical Sciences; National Institute of Science Education and Research (NISER); Bhubaneswar - 751005 Odisha India
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15
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Białek MJ, Białońska A, Latos-Grażyński L. Oxidation and Oxygenation of Carbonyl Ruthenium(II) Azuliporphyrin. Inorg Chem 2015; 54:6184-94. [DOI: 10.1021/acs.inorgchem.5b00324] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Michał J. Białek
- Department of Chemistry, University of Wrocław, F.
Joliot-Curie 14, 50-383 Wrocław, Poland
| | - Agata Białońska
- Department of Chemistry, University of Wrocław, F.
Joliot-Curie 14, 50-383 Wrocław, Poland
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17
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Lash TD, Toney AM, Castans KM, Ferrence GM. Synthesis of Benziporphyrins and Heterobenziporphyrins and an Assessment of the Diatropic Characteristics of the Protonated Species. J Org Chem 2013; 78:9143-52. [DOI: 10.1021/jo401365p] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Timothy D. Lash
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
| | - Ashley M. Toney
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
| | - Kylie M. Castans
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
| | - Gregory M. Ferrence
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
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19
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Myśliborski R, Rachlewicz K, Latos-Grażyński L. Low-spin organoiron(III) N-confused pyriporphyrin. J PORPHYR PHTHALOCYA 2012. [DOI: 10.1142/s1088424607000229] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Oxidation of ( PyP H) Fe II Br , an iron(II) complex of 6,11,16,21-tetraaryl-3-aza-m-benziporphyrin ( N -confused pyriporphyrin, ( PyP H) H ) has been followed, in the presence of pyridine, by 1 H and 2 H NMR spectroscopy. One-electron oxidation with dioxygen, accompanied by deprotonation of a C (22) H fragment and formation of a Fe - C (22) bond, produced a low-spin, six-coordinate iron(III) complex [( PyP ) Fe III( py )2]+ as confirmed by combination of 1 H NMR, EPR and structural data. The characteristic patterns of 1 H NMR pyrrole and meso-aryl resonances resemble features assigned to the less common, low-spin ground electronic state (( d xz d yz )4( d xy )1) of iron(III) regular porphyrins. A conformational rearrangement process has been detected which involves two structures differentiated by macrocyclic ruffling. The structure of { H [( PyP ) Fe III( py )2]2}( Fe III Br 4)3· CH 2 Cl 2 has been determined by X-ray crystallography. The cationic complex involves a six-coordinate iron atom bound to the N -confused pyriporphyrin through its three nitrogens ( Fe - N (23) = 1.924(7), Fe - N (24) = 1.979(7), Fe - N (25) = 1.9343(7) Å) and the pirydyl trigonal C (22) atom ( Fe (1)- C (22) = 1.972(10) Å). The porphyrin is strongly ruffled, defining two deep grooves along C meso - C meso axes at right angles to each other. Two axial pyridine ligands are located in the prearranged equatorial ligand grooves. The iron lies in the N 3 C plane of the macrocycle defined by coordinating nitrogen and carbon atoms. In the solid, pairs of molecules are positioned along the line defined by Fe (1)- C (22) and Fe (2)- C (91) bonds. The structure demonstrates the head-to-head arrangement of two [( PyP ) Fe III( py )2]+ subunits revealing the adjacency of the two perimeter nitrogen atoms (the N (3)⋯ N (72) distance = 2.587(10) Å) linked by the N ⋯ H ⋯ N hydrogen bond.
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Affiliation(s)
- Radomir Myśliborski
- Department of Chemistry, University of Wrocław, 14 F. Joliot-Curie St. Wrocław 50 383, Poland
| | - Krystyna Rachlewicz
- Department of Chemistry, University of Wrocław, 14 F. Joliot-Curie St. Wrocław 50 383, Poland
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Pacholska-Dudziak E, Gaworek A, Latos-Grażyński L. Iron(II) Vacataporphyrins: A Variable Annulene Conformation inside a Regular Porphyrin Frame. Inorg Chem 2011; 50:10956-65. [DOI: 10.1021/ic2015176] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ewa Pacholska-Dudziak
- Department of Chemistry, University of Wrocław, ul. F. Joliot-Curie 14, 50-383 Wrocław, Poland
| | - Aneta Gaworek
- Department of Chemistry, University of Wrocław, ul. F. Joliot-Curie 14, 50-383 Wrocław, Poland
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Bonner ES, Engle JT, Sripothongnak S, Ziegler CJ. Zinc complexes of the carbahemiporphyrazines. Dalton Trans 2010; 39:1932-4. [DOI: 10.1039/b925669e] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Sripothongnak S, Barone N, Ziegler CJ. C–H bond activation and ring oxidation in nickel carbahemiporphyrazines. Chem Commun (Camb) 2009:4584-6. [DOI: 10.1039/b909871b] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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23
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Bröring M, Kleeberg C. Preparation, Structural Characterization and Ligand Exchange Reactivity of Sterically Hindered 1,3-Bis-(4-methyl-2-thiazolylimino)isoindolinatopalladium(II) Complexes. Z Anorg Allg Chem 2007. [DOI: 10.1002/zaac.200700093] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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24
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Lash TD, Pokharel K, Serling JM, Yant VR, Ferrence GM. Aromatic and Nonaromatic Pyriporphyrins. Org Lett 2007; 9:2863-6. [PMID: 17602489 DOI: 10.1021/ol071052x] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Pyriporphyrins with three different orientations for the pyridine moiety have been prepared using a '3 + 1' strategy. The nonaromatic pyriporphyrins are stable so long as phenyl substituents are present at the meso-positions adjacent to the pyridine ring. An aromatic dihydropyriporphyrin with an external CO2Ph protective group has also been prepared from 2,4-pyridinedicarbaldehyde.
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Affiliation(s)
- Timothy D Lash
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, USA.
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25
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Pacholska‐Dudziak E, Latos‐Grażyński L. NMR Studies of Paramagnetic Metallocarbaporphyrinoids. Eur J Inorg Chem 2007. [DOI: 10.1002/ejic.200700078] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Ewa Pacholska‐Dudziak
- Department of Chemistry, University of Wrocław, 14 F. Joliot‐Curie St., Wrocław 50 383, Poland
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26
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Bröring M, Prikhodovski S, Brandt CD, Tejero EC, Köhler S. Monomeric and polymeric copper and zinc tripyrrins. Dalton Trans 2007:200-8. [PMID: 17180188 DOI: 10.1039/b613800d] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Neutral transition metal complexes of different alpha,omega-dimethyltripyrrins TrpyMX with M = Cu(II) and Zn(II) have been prepared with a variety of anionic halogeno and pseudohalogeno ligands X, and have been studied with respect to coordination modes and structural distortion. Only four- and five-coordinate species have been observed throughout the series. All four-coordinate species display unstrained, but distorted tetrahedral or strained and distorted square-planar coordination environments for zinc(II) and copper(II) species, respectively, thus following the expectations from simple ligand field arguments. Five-coordinate species do not form easily and were observed either in donor solvents or in the solid as 1D coordination polymers with distorted trigonal-bipyramidal coordination and different topologies.
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Affiliation(s)
- Martin Bröring
- Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Strasse, 35032 Marburg, Germany.
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Rachlewicz K, Gorzelańczyk D, Latos-Grazyński L. Iron Complexes of C- and N-Methylated 2-Aza-21-carbaporphyrin: NMR Studies. Inorg Chem 2006; 45:9742-7. [PMID: 17112270 DOI: 10.1021/ic061092h] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Insertion of iron(II) into methylated derivatives of N-confused porphyrins 2-aza-2-methyl-5,10,15,20-tetraphenyl-21-carbaporphyrin (MeCTPPH)H, 2-aza-5,10,15,20-tetraphenyl-21-methyl-21-carbaporphyrin (CTPPMe)H2, and 2-aza-2-methyl-5,10,15,20-tetraphenyl-21-methyl-21-carbaporphyrin (MeCTPPMe)H yielded N- or C-methylated high-spin iron(II) complexes (MeCTPPH)Fe(II)Br, (HCTPPMe)Fe(II)Br, and (MeCTPPMe)Fe(II)Br. One electron oxidation of (Me-CTPPH)Fe(II)Br using Br2, accompanied by deprotonation of a C(21)-H(21) fragment and formation of an Fe-C(21) bond, produces an intermediate-spin, five-coordinate iron(III) complex (MeCTPP)Fe(III)Br. Simultaneously, a high-spin complex [(MeCTPPH)Fe(III)Br]+ was formed which preserved the side-on interaction between the metal ion and the inverted pyrrole ring. &[(MeCTPPH)Fe(III)Br]+ was also obtained by titration of (MeCTPP)FeIIIBr with TFA due to the C(21) protonation. A titration of (HCTPPMe)Fe(II)Br and (MeCTPPMe)Fe(II)Br with Br2 yielded solely corresponding high-spin iron(III) species [(HCTPPMe)Fe(III)Br+ and [(MeCTPPMe)Fe(III)Br+. Dioxygen reacts cleanly with (MeCTPPH)Fe(II)Br carbaporphyrin to form solely (MeCTPP)Fe(III)Br. The 1H NMR spectra of paramagnetic iron(II) and iron(III) complexes were examined. The characteristic patterns of pyrrole, C-methyl, and N-methyl resonances were found diagnostic of the ground electronic state of iron and the coordinating nature of the N-confused pyrrole. The characteristic C-Me resonances occur in a unique window (520-420 ppm) for iron(III) C-methylated N-confused porphyrins which remains in contrast with relatively small values found for iron(II) C-methylated derivatives (50-80 ppm).
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Affiliation(s)
- Krystyna Rachlewicz
- Department of Chemistry, University of Wrocław, 14 F. Joliot-Curie St., Wrocław 50 383, Poland
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