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Campanella AJ, Ozvat TM, Zadrozny JM. Ligand design of zero-field splitting in trigonal prismatic Ni(II) cage complexes. Dalton Trans 2022; 51:3341-3348. [PMID: 35137732 PMCID: PMC8992015 DOI: 10.1039/d1dt02156g] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Complexes of encapsulated metal ions are promising potential metal-based electron paramagnetic resonance imaging (EPRI) agents due to zero-field splitting. Herein, we synthesize and magnetically characterize a series of five new Ni(II) complexes based on a clathrochelate ligand to provide a new design strategy for zero-field splitting in an encaged environment. UV-Vis and X-ray single-crystal diffraction experiments demonstrate slight physical and electronic structure changes as a function of the differing substituents. The consequence of these changes at the remote apical and sidearm positions of the encaging ligands is a zero-field splitting parameter (D) that varies over a large range of 11 cm-1. These results demonstrate a remarkable flexibility of the zero-field splitting and electronic structure in nickelous cages and give a clear toolkit for modifying zero-field splitting in highly stable ligand shells.
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Affiliation(s)
| | - Tyler M. Ozvat
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA
| | - Joseph M. Zadrozny
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA
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Shylin SI, Pogrebetsky JL, Husak AO, Bykov D, Mokhir A, Hampel F, Shova S, Ozarowski A, Gumienna-Kontecka E, Fritsky IO. Expanding manganese(IV) aqueous chemistry: unusually stable water-soluble hexahydrazide clathrochelate complexes. Chem Commun (Camb) 2021; 57:11060-11063. [PMID: 34610631 DOI: 10.1039/d1cc04870h] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Mn cage complexes are rare, and the ones successfully isolated in the solid state are not stable in water and organic solvents. Herein, we present the first report of mononuclear Mn clathrochelates, in which the encapsulated metal exists in the oxidation state +4. The complexes are extremely stable in the crystalline state and in solutions and show rich redox chemistry.
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Affiliation(s)
- Sergii I Shylin
- Department of Chemistry, Taras Shevchenko National University of Kyiv, 64, Volodymyrska Str., 01601 Kiev, Ukraine. .,Department of Chemistry - Ångström Laboratory, Uppsala University, PO Box 523, 75120 Uppsala, Sweden
| | - James L Pogrebetsky
- Department of Chemistry, Taras Shevchenko National University of Kyiv, 64, Volodymyrska Str., 01601 Kiev, Ukraine.
| | - Alina O Husak
- Department of Chemistry, Taras Shevchenko National University of Kyiv, 64, Volodymyrska Str., 01601 Kiev, Ukraine. .,PBMR Labs Ukraine, Murmanska 1, 02094 Kiev, Ukraine
| | - Dmytro Bykov
- National Center for Computational Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Andriy Mokhir
- Department of Chemistry and Pharmacy, Friedrich-Alexander-University Erlangen-Nürnberg, Nikolaus-Fiebiger-Str. 10, 91058 Erlangen, Germany
| | - Frank Hampel
- Department of Chemistry and Pharmacy, Friedrich-Alexander-University Erlangen-Nürnberg, Nikolaus-Fiebiger-Str. 10, 91058 Erlangen, Germany
| | - Sergiu Shova
- "Poni Petru" Institute of Macromolecular Chemistry, Aleea Gr. Ghica Voda 41A, 700487 Iasi, Romania
| | - Andrew Ozarowski
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA
| | | | - Igor O Fritsky
- Department of Chemistry, Taras Shevchenko National University of Kyiv, 64, Volodymyrska Str., 01601 Kiev, Ukraine. .,PBMR Labs Ukraine, Murmanska 1, 02094 Kiev, Ukraine
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Ureche D, Bulhac I, Rija A, Coropceanu E, Bourosh P. Dianilineglyoxime Salt and Its Binuclear Zn(II) and Mn(II) Complexes with 1,3-Benzenedicarboxylic Acid: Synthesis and Structures. RUSS J COORD CHEM+ 2020. [DOI: 10.1134/s107032841912008x] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Liu M, Fang W, Liu S. Novel 99mTc(III) Complexes [99mTcCl(CDO)(CDOH)2B–R] (CDOH2 = Cyclohexanedione Dioxime) Useful as Radiotracers for Heart Imaging. Bioconjug Chem 2016; 27:2770-2779. [DOI: 10.1021/acs.bioconjchem.6b00552] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Min Liu
- Department
of Radiation Medicine and Protection, Medical College, Soochow University, China
- School
of Health Sciences, Purdue University, Indiana 47907, United States
| | - Wei Fang
- Department
of Nuclear Medicine, Fuwai Hospital, the National Center for Cardiovascular
Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Shuang Liu
- School
of Health Sciences, Purdue University, Indiana 47907, United States
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New rhenium(III) semiclathrochelates with biorelevant apical substituents: Synthesis, X-ray structure and reactivity. INORG CHEM COMMUN 2016. [DOI: 10.1016/j.inoche.2016.07.019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Kaya Y, Icsel C, Yilmaz VT, Buyukgungor O. A palladium(II) complex containing both carbonyl and imine oxime ligands: crystal structure, experimental and theoretical UV-vis, IR and NMR studies. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 108:133-140. [PMID: 23466323 DOI: 10.1016/j.saa.2013.01.054] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2012] [Revised: 01/22/2013] [Accepted: 01/23/2013] [Indexed: 06/01/2023]
Abstract
A new palladium(II) complex, [Pd(ppeieo)(inap)]·DMSO (ppeieo=(1E,2E)-phenyl-[(1-phenylethyl)imino]-ethanal oxime and inap=isonitrosoacetophenone) has been synthesized and characterized by elemental analysis, UV-vis, IR, NMR. X-ray diffraction analysis of the DMSO solvate of the complex shows that the palladium(II) ion is coordinated in a distorted square-planar geometry by ppeieo and inap, which is formed during the hydrolysis of ppeieo. DFT (B3LYP/LANL2DZ) calculations on the complex have been carried out to correlate geometry and spectroscopic properties such as electronic, vibrational and NMR chemical shifts. The complete vibrational frequency assignments were made and the calculation results were applied to simulate infrared spectra of the title compound which shows good agreement with observed spectra. The calculated HOMO and LUMO energies show that several transitions including the π→π(*) and charge transfer occur within the molecule. The chemical shifts reasonably correspond to the calculated spectra.
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Affiliation(s)
- Yunus Kaya
- Department of Chemistry, Faculty of Arts and Sciences, Uludag University, 16059 Bursa, Turkey
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8
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Theoretical study of hydrolysis of an imine oxime in aqueous solution and crystal structure and spectroscopic characterization of a platinum(II) complex containing the hydrolysis product. Struct Chem 2013. [DOI: 10.1007/s11224-013-0273-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Four novel polytungstate compounds built up of paradodecatungstate clusters and transition-metal complexes/transition metal: Synthesis, structure, and electrochemical properties. Inorganica Chim Acta 2011. [DOI: 10.1016/j.ica.2011.10.011] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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10
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The characteristics of sub 10 nm manganese oxide T1 contrast agents of different nanostructured morphologies. Biomaterials 2010; 31:4073-8. [DOI: 10.1016/j.biomaterials.2010.01.087] [Citation(s) in RCA: 113] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2009] [Accepted: 01/15/2010] [Indexed: 11/18/2022]
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Stamatatos TC, Nastopoulos V, Tasiopoulos AJ, Moushi EE, Wernsdorfer W, Christou G, Perlepes SP. High nuclearity single-molecule magnets: a mixed-valence Mn26 cluster containing the di-2-pyridylketone diolate dianion. Inorg Chem 2008; 47:10081-9. [PMID: 18841928 DOI: 10.1021/ic801342f] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The employment of the dianion (dpkd(2-)) of the gem-diol form of di-2-pyridylketone (dpk) as a tetradentate chelate in manganese chemistry is reported, and the synthesis, crystal structure, and magnetochemical characterization of [Mn26O16(OMe)12(dpkd)12(MeOH)6](OH)6 x solv (3 x solv) are described. The reaction of Mn(ClO4)2 x 6 H2O, dpk, NaOMe, and NEt3 (2:1:4:2) in MeCN/MeOH affords complex 3, which possesses a rare metal topology and is mixed-valence (4 Mn(II), 22 Mn(III)). The complicated [Mn26(mu4-O)10(mu3-O)6(mu3-OMe)12(mu-OR)12](18+) core of 3 consists of an internal Mn(III)16 cage of adjacent Mn4 tetrahedra surrounded by an external Mn(II)4Mn(III)6 shell. The latter is held together by the alkoxide arms of twelve eta(1):eta(2):eta(1):eta(1):mu3 dpkd(2-) groups. Variable-temperature, solid-state direct current (dc), and alternating current (ac) magnetization studies were carried out on 3 in the 1.8-300 K range. Complex 3 is predominantly antiferromagnetically coupled with a resulting S = 6 ground state, a conclusion confirmed by the in-phase (chi'(M)) ac susceptibility data. The observation of out-of-phase (chi''(M)) ac susceptibility signals suggested that 3 might be a single-molecule magnet, and this was confirmed by single-crystal magnetization vs dc field sweeps that exhibited hysteresis, the diagnostic property of a magnet. Combined ac chi''(M) and magnetization decay vs time data collected below 1.1 K were used to construct an Arrhenius plot; the fit of the thermally activated region above approximately 0.1 K gave U(eff) = 30 K, where U(eff) is the effective relaxation barrier. At lower temperatures, the complex exhibits temperature-independent relaxation, characteristic of ground-state quantum tunneling of magnetization between the lowest-lying M(s) = +/-6 levels. The combined work demonstrates the ligating flexibility of dipyridyl-diolate chelates and their usefulness in the synthesis of polynuclear Mn(x) clusters with interesting magnetic properties, without requiring the co-presence of carboxylate ligands.
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