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Payce EN, Knighton RC, Platts JA, Horton PN, Coles SJ, Pope SJA. Luminescent Pt(II) Complexes Using Unsymmetrical Bis(2-pyridylimino)isoindolate Analogues. Inorg Chem 2024; 63:8273-8285. [PMID: 38656154 PMCID: PMC11080048 DOI: 10.1021/acs.inorgchem.4c00558] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2024] [Revised: 04/09/2024] [Accepted: 04/11/2024] [Indexed: 04/26/2024]
Abstract
A series of ligands based upon a 1,3-diimino-isoindoline framework have been synthesized and investigated as pincer-type (N∧N∧N) chelates for Pt(II). The synthetic route allows different combinations of heterocyclic moieties (including pyridyl, thiazole, and isoquinoline) to yield new unsymmetrical ligands. Pt(L1-6)Cl complexes were obtained and characterized using a range of spectroscopic and analytical techniques: 1H and 13C NMR, IR, UV-vis and luminescence spectroscopies, elemental analyses, high-resolution mass spectrometry, electrochemistry, and one example via X-ray crystallography which showed a distorted square planar environment at Pt(II). Cyclic voltammetry on the complexes showed one irreversible oxidation between +0.75 and +1 V (attributed to Pt2+/3+ couple) and a number of ligand-based reductions; in four complexes, two fully reversible reductions were noted between -1.4 and -1.9 V. Photophysical studies showed that Pt(L1-6)Cl absorbs efficiently in the visible region through a combination of ligand-based bands and metal-to-ligand charge-transfer features at 400-550 nm, with assignments supported by DFT calculations. Excitation at 500 nm led to luminescence (studied in both solutions and solid state) in all cases with different combinations of the heterocyclic donors providing tuning of the emission wavelength around 550-678 nm.
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Affiliation(s)
- Ellie N Payce
- School of Chemistry, Main Building, Cardiff University, Cardiff CF10 3AT, Cymru/Wales, U.K
| | - Richard C Knighton
- School of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, England, U.K
| | - James A Platts
- School of Chemistry, Main Building, Cardiff University, Cardiff CF10 3AT, Cymru/Wales, U.K
| | - Peter N Horton
- UK National Crystallographic Service, Chemistry, Faculty of Natural and Environmental Sciences, University of Southampton, Highfield, Southampton SO17 1BJ, England, U.K
| | - Simon J Coles
- UK National Crystallographic Service, Chemistry, Faculty of Natural and Environmental Sciences, University of Southampton, Highfield, Southampton SO17 1BJ, England, U.K
| | - Simon J A Pope
- School of Chemistry, Main Building, Cardiff University, Cardiff CF10 3AT, Cymru/Wales, U.K
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2
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Abstract
The bis(pyridylimino)isoindoline (BPI) ligand is a tridentate chelate that binds to metals via a meridional coordination mode. However, when this ligand forms a complex with Re(CO)3, an almost exclusively facial moiety, the BPI ligand deforms to coordinate in a facial mode. We have in-vestigated this deformation via structural and theoretical means, and the non-planar binding mode of the ligand bathochromically shifts the metal to ligand charge transfer (MLCT) transition.
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Osinski AJ, Morris DL, Herrick RS, Ziegler CJ. Re(CO) 3-Templated Synthesis of α-Amidinoazadi(benzopyrro)methenes. Inorg Chem 2017; 56:14734-14737. [PMID: 29172475 DOI: 10.1021/acs.inorgchem.7b02140] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
α-Amidinoazadi(benzopyrro)methenes were synthesized using the Re(CO)3 unit as a templating agent. The products of these template reactions are six-coordinate rhenium complexes, with a facial arrangement of carbonyls, a noncoordinating anion, and a tridentate α-amidinoazadi(benzopyrro)methene ligand. The tridentate ligand shows the conversion of one diiminoisoindoline sp2 carbon to a sp3 carbon, which has been seen in the "helmet" and bicyclic phthalocyanines. The bidentate diiminoisoindoline fragment tilts out of the plane of coordination. Five examples of α-amidinoazadi(benzopyrro)methenes produced from these reactions using different nitrile solvents, including the nitrile activation of acetonitrile, propionitrile, butyronitrile, cyclohexanecarbonitrile, and benzonitrile.
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Affiliation(s)
- Allen J Osinski
- Department of Chemistry, University of Akron , Akron, Ohio 44325-3601, United States
| | - Daniel L Morris
- Department of Chemistry, University of Akron , Akron, Ohio 44325-3601, United States
| | - Richard S Herrick
- Department of Chemistry, College of the Holy Cross , 1 College Street, Worcester, Massachusetts 01610, United States
| | - Christopher J Ziegler
- Department of Chemistry, University of Akron , Akron, Ohio 44325-3601, United States
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Filipović NR, Elshaflu H, Grubišić S, Jovanović LS, Rodić M, Novaković I, Malešević A, Djordjević IS, Li H, Šojić N, Marinković A, Todorović TR. Co(iii) complexes of (1,3-selenazol-2-yl)hydrazones and their sulphur analogues. Dalton Trans 2017; 46:2910-2924. [PMID: 28197616 DOI: 10.1039/c6dt04785h] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The first Co(iii) complexes with (1,3-selenazol-2-yl)hydrazones as an unexplored class of ligands were prepared and characterized by NMR spectroscopy and X-ray diffraction analysis. The novel ligands act as NNN tridentate chelators forming octahedral Co(iii) complexes. The impact of structural changes on ligands' periphery as well as that of isosteric replacement of sulphur with selenium on the electrochemical and electronic absorption features of complexes are explored. To support the experimental data, density functional theory (DFT) calculations were also conducted. Theoretical NMR chemical shifts, the relative energies and natural bond orbital (NBO) analysis are calculated within the DFT approach, while the singlet excited state energies and HOMO-LUMO energy gap were calculated with time-dependent density functional theory (TD-DFT). The electrophilic f- and nucleophilic f+ Fukui functions are well adapted to find the electrophile and nucleophile centres in the molecules. Both (1,3-selenazol-2-yl)- and (1,3-thiazol-2-yl)hydrazone Co(iii) complexes showed potent antimicrobial and antioxidant activity. A significant difference among them was a smaller cytotoxicity of selenium compounds.
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Affiliation(s)
- Nenad R Filipović
- Department of Chemistry and Biochemistry, Faculty of Agriculture, University of Belgrade, Nemanjina 6, Belgrade, Serbia
| | - Hana Elshaflu
- Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, Belgrade, Serbia
| | - Sonja Grubišić
- Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Njegoševa 12, Belgrade, Serbia
| | - Ljiljana S Jovanović
- Department of Chemistry, Faculty of Sciences, University of Novi Sad, Trg Dositeja Obradovića 4, Novi Sad, Serbia
| | - Marko Rodić
- Department of Chemistry, Faculty of Sciences, University of Novi Sad, Trg Dositeja Obradovića 4, Novi Sad, Serbia
| | - Irena Novaković
- Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Njegoševa 12, Belgrade, Serbia
| | - Aleksandar Malešević
- Faculty of Chemistry, University of Belgrade, Studentski trg 12-16, Belgrade, Serbia.
| | - Ivana S Djordjević
- Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Njegoševa 12, Belgrade, Serbia
| | - Haidong Li
- University of Bordeaux, Bordeaux INP, ENSCBP, Institut des Sciences Moléculaires, CNRS UMR 5255, 16 Avenue Pey-Berland, 33607 Pessac, France
| | - Nešo Šojić
- University of Bordeaux, Bordeaux INP, ENSCBP, Institut des Sciences Moléculaires, CNRS UMR 5255, 16 Avenue Pey-Berland, 33607 Pessac, France
| | - Aleksandar Marinković
- Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, Belgrade, Serbia
| | - Tamara R Todorović
- Faculty of Chemistry, University of Belgrade, Studentski trg 12-16, Belgrade, Serbia.
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Osinski AJ, Blesener T, Hasheminasab A, Holstrom C, Nemykin VN, Herrick RS, Ziegler CJ. Re(CO)3-Templated Synthesis of Semihemiporphyrazines. Inorg Chem 2016; 55:12527-12530. [PMID: 27989194 DOI: 10.1021/acs.inorgchem.6b02558] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Allen J. Osinski
- Department of Chemistry, University of Akron, Akron, Ohio 44312-3601, United States
| | - Tanner Blesener
- Department of Chemistry, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
| | - Abed Hasheminasab
- Department of Chemistry, University of Akron, Akron, Ohio 44312-3601, United States
| | - Cole Holstrom
- Department of Chemistry and Biochemistry University of Minnesota—Duluth 1039 University Drive, Duluth, Minnesota 55812, United States
| | - Victor N. Nemykin
- Department of Chemistry, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
- Department of Chemistry and Biochemistry University of Minnesota—Duluth 1039 University Drive, Duluth, Minnesota 55812, United States
| | - Richard S. Herrick
- Department
of Chemistry, College of the Holey Cross, 1 College Street, Worcester, Massachusetts 01610, United States
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Abstract
During the past decade isoindoline-based ligands became the subject of growing interest due to their modular set-up.
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Affiliation(s)
- Róbert Csonka
- Department of Chemistry
- University of Pannonia
- 8201 Veszprém
- Hungary
| | - Gábor Speier
- Department of Chemistry
- University of Pannonia
- 8201 Veszprém
- Hungary
| | - József Kaizer
- Department of Chemistry
- University of Pannonia
- 8201 Veszprém
- Hungary
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Martić G, Engle JT, Ziegler CJ. Complexes of 1,3-bis(2-thiazolylimino)isoindoline with middle and late first row transition metals. INORG CHEM COMMUN 2011. [DOI: 10.1016/j.inoche.2011.08.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Bröring M, Kleeberg C. Bis(4-methylthiazolyl)isoindoline (4-Mebti) Complexes of Palladium: Cationic [PdII(4-Mebti)L]+ Species with a L = Neutral Group XIV or Group XV Donor Ligand. Z Anorg Allg Chem 2011. [DOI: 10.1002/zaac.201100211] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Chang SH, Scarfato A, Kleeberg C, Bröring M, Hoffmann G, Wiesendanger R. Adsorption behavior of asymmetric Pd pincer complexes on a Cu(111) surface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:10868-10871. [PMID: 20441153 DOI: 10.1021/la100746a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
We address the adsorption of asymmetric Pd pincer complexes on a Cu(111) surface by scanning tunneling microscopy. The structural asymmetry is manifested in the observation of two chiral enantiomers. To enable an unambiguous identification of individual constituents, three closely related complexes with small modifications are investigated in parallel. Thereby, methyl substituents determine attractive molecule-molecule interaction. Depending on their distribution, dimerization and tetramerization can be observed.
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Affiliation(s)
- Shih-Hsin Chang
- Institute of Applied Physics and Microstructure Research Center Hamburg, University of Hamburg, Germany
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