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Roy S, Paul S, Misra A. A Theoretical Account of the Coupling between Metal- and Ligand-centred Spins. Chemphyschem 2023; 24:e202200889. [PMID: 36622254 DOI: 10.1002/cphc.202200889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2022] [Revised: 01/04/2023] [Accepted: 01/09/2023] [Indexed: 01/10/2023]
Abstract
This study addresses the magnetic interaction between paramagnetic metal ions and the radical ligands taking the [CuII (hfac)2 (imVDZ)] and [MII (hfac)2 (pyDTDA)] (imVDZ=1,5-dimethyl-3-(1-methyl-2-imidazolyl)-6-oxoverdazyl; hfac=(1,1,1,5,5,5)hexafluroacetylacetonate; pyDTDA=4-(2'-pyridyl)-1,2,3,5-dithiadiazolyl), (M=Cu, Ni, Co, Fe, Mn) compounds as reference systems. The coupling between the metal and ligand spins is quantified in terms of the exchange coupling constant (J) in the platform of density functional theory (DFT) and the wave function-based complete active space self-consistent field (CASSCF) method. Application of DFT and broken symmetry (BS) formalism results ferromagnetic coupling for all the transition metal complexes except the Mn(II) complex. This DFT-BS prediction of magnetic nature matches with the experimental finding for all the complexes other than the Fe(II)-pyDTDA complex, for which an antiferromagnetic coupling between high spin iron and the thiazyl ligand has been reported. However, evaluation of spin state energetics through the multiconfigurational wave function-based method produces the S=3/2 ground spin state for the iron-thiazyl in parity with experiment. Electronic structure analyses find the overlap between the metal- and ligand-based singly occupied molecular orbitals (SOMOs) to be one of the major reasons attributing to different extent of exchange coupling in the systems under investigation.
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Affiliation(s)
- Sriparna Roy
- Department of Chemistry, University of North Bengal, Siliguri, Darjeeling , 734013, India
| | - Satadal Paul
- Department of Chemistry, Bangabasi Morning College, 19 R.C Sarani, Kolkata, 700009, India
| | - Anirban Misra
- Department of Chemistry, University of North Bengal, Siliguri, Darjeeling , 734013, India
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2
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Kaim W, Löw I, Ringenberg MR, Schwederski B, Filippou V, Fiedler J. Tetrazine Chelate Ligands Bridging Two [Ru(acac)2] Fragments: Mixed Valency and Radical Complex Formation. Z Anorg Allg Chem 2022. [DOI: 10.1002/zaac.202200152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Wolfgang Kaim
- Universität Stuttgart Institut für Anorganische Chemie Pfaffenwaldring 55 70550 Stuttgart GERMANY
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3
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Wang T, Yao B, Guo Z, Chang X, Deng YF, Zhang YZ. Self-assembly of Ni(II) metallacycles (a square and a triangle) supported by tetrazine radical bridges. Dalton Trans 2022; 51:7644-7649. [PMID: 35510917 DOI: 10.1039/d2dt00221c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Two Ni(II) molecular metallacycles of [Ni4(bpz*tz˙-)4(N3)4] (1) and [Ni3(bpzPhtz˙-)3(pzPh(Cl)tz˙-)3]·1.3CH3OH·9.3H2O (2) (bpz*tz = 3,6-bis(3,5-dimethyl-pyrazolyl)-1,2,4,5-tetrazine; bpzPhtz = 3,6-bis(3-phenyl-pyrazolyl)-1,2,4,5-tetrazine; and pzPh(Cl)tz = 3-bis(3-phenyl-pyrazolyl)-6-Cl-1,2,4,5-tetrazine) are reported. The single-crystal X-ray diffraction study reveals that 1 displays a square structure while 2 shows a triangle structure due to the steric effect, both bearing tetrazine radical bridges. Furthermore, magnetic studies reveal that the Ni-radical interaction in 1 is strongly ferromagnetic with a coupling constant (J) of 90.8 cm-1 in the 2J formalist, while the overall antiferromagnetic behaviour of 2 is presumably due to the compete ferromagnetic (for the Ni-radicalbridging interaction with J1 = 95.4 cm-1) and antiferromagnetic (for the Ni-radicalterminal interaction, J2 = -57.5 cm-1) couplings.
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Affiliation(s)
- Te Wang
- Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen, 518055, P. R. China.
| | - Binling Yao
- Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen, 518055, P. R. China.
| | - Zhilin Guo
- Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen, 518055, P. R. China.
| | - Xiaoyong Chang
- Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen, 518055, P. R. China.
| | - Yi-Fei Deng
- Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen, 518055, P. R. China.
| | - Yuan-Zhu Zhang
- Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen, 518055, P. R. China.
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4
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Yao B, Singh MK, Deng YF, Zhang YZ. A Dicobalt(II) Single-Molecule Magnet via a Well-Designed Dual-Capping Tetrazine Radical Ligand. Inorg Chem 2021; 60:18698-18705. [PMID: 34823356 DOI: 10.1021/acs.inorgchem.1c02094] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The recent years have witnessed the glory development for the construction of high-performance mononuclear single molecule magnets (SMMs) within a specific coordination geometry, which, however, is not well applied in cluster-based SMMs due to the synthetic challenges. Given that the monocobalt(II) complexes within a trigonal-prismatic (TPR) coordination geometry have been classified as excellent SMMs with huge axial anisotropy (D ≈ -100 cm-1), here we designed and synthesized a new dual-capping tetrazine ligand, 3,6-bis(6-(di(1H-pyrazol-1-yl)methyl)pyridin-2-yl)-1,2,4,5-tetrazine (bpptz), and prepared a novel dicobalt(II) complex, [Cp2CoIII][{(hfac)CoII}2(bpptz•-)][hfac]2·2Et2O (1, hfac = hexafluoroacetylacetonate). In the structure of 1, the bpptz•- radical ligand enwraps two Co(II) centers within quasi-TPR geometries, which are further bridged by the tetrazine radical in the trans mode. The magnetic study revealed that the interaction between the Co centers and the tetrazine radical is strongly antiferromagnetic with a coupling constant (J) of -65.8 cm-1 (in the -2J formalism). Remarkably, 1 exhibited the typical SMM behavior with an effective energy barrier of 69 cm-1 under a 1.5 kOe dc field, among the largest for polynuclear transition metal SMMs. In addition, DFT and ab initio calculations suggested that the presence of a strong Co(II)-radical magnetic interaction effectively quenches the QTM effect and enhances the barrier height for the magnetization reversal.
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Affiliation(s)
- Binling Yao
- Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China
| | - Mukesh Kumar Singh
- EastCHEM School of Chemistry, The University of Edinburgh, David Brewster Road, Edinburgh, Scotland EH9 3FJ, U.K
| | - Yi-Fei Deng
- Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China
| | - Yuan-Zhu Zhang
- Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China
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5
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Klokishner S, Reu O, Roman M. Valence tautomeric transformation in the [CrCo] compound: exploration of cooperative interactions. Phys Chem Chem Phys 2021; 23:21714-21728. [PMID: 34581720 DOI: 10.1039/d1cp03209g] [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
A crystal containing the heterometallic Cr-ligand-Co cluster with an unpaired electron on the ligand as a structural unit is examined. The developed model which describes the magnetic and polarizability characteristics of this crystal takes into account that the electron residing on the ligand can be transferred to the Co-ion, thus converting the diamagnetic ls-CoIII ion into the paramagnetic hs-CoII one. Since this transformation is accompanied by electron density redistribution and elongation of the Co-N bond lengths, the vibronic interaction of the Co-ion with totally symmetric displacements of the nearest surroundings and cooperative dipole-dipole and electron-deformational interactions are accounted for as well. The exchange interactions between the CrIII ion and the electron localized on the ligand as well as in the CrIII-hs-CoII pair are also included in consideration; the parameters of these interactions are estimated within the framework of the DFT method. Bistability in the magnetic and polarization characteristics is predicted for certain strengths of intra- and intercluster interactions in the crystal under study. Within the framework of the developed approach an explanation of the observed magnetic properties of the [Cr(SS-cth)(Co(RR-cth)(μ-dhbq))](PF6)2Cl crystal is given.
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Affiliation(s)
- Sophia Klokishner
- Institute of Applied Physics, MD-2028, Academy str. 5, MD-2028, Chişinau, Republic of Moldova.
| | - Oleg Reu
- Institute of Applied Physics, MD-2028, Academy str. 5, MD-2028, Chişinau, Republic of Moldova.
| | - Marianna Roman
- Institute of Applied Physics, MD-2028, Academy str. 5, MD-2028, Chişinau, Republic of Moldova.
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6
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Wang P, Saber MR, VanNatta PE, Yap GPA, Popescu CV, Scarborough CC, Kieber-Emmons MT, Dunbar KR, Riordan CG. Molecular and Electronic Structures and Single-Molecule Magnet Behavior of Tris(thioether)-Iron Complexes Containing Redox-Active α-Diimine Ligands. Inorg Chem 2021; 60:6480-6491. [PMID: 33840189 DOI: 10.1021/acs.inorgchem.1c00214] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Incorporating radical ligands into metal complexes is one of the emerging trends in the design of single-molecule magnets (SMMs). While significant effort has been expended to generate multinuclear transition metal-based SMMs with bridging radical ligands, less attention has been paid to mononuclear transition metal-radical SMMs. Herein, we describe the first α-diiminato radical-containing mononuclear transition metal SMM, namely, [κ2-PhTttBu]Fe(AdNCHCHNAd) (1), and its analogue [κ2-PhTttBu]Fe(CyNCHCHNCy) (2) (PhTttBu = phenyltris(tert-butylthiomethyl)borate, Ad = adamantyl, and Cy = cyclohexyl). 1 and 2 feature nearly identical geometric and electronic structures, as shown by X-ray crystallography and electronic absorption spectroscopy. A more detailed description of the electronic structure of 1 was obtained through EPR and Mössbauer spectroscopies, SQUID magnetometry, and DFT, TD-DFT, and CAS calculations. 1 and 2 are best described as high-spin iron(II) complexes with antiferromagnetically coupled α-diiminato radical ligands. A strong magnetic exchange coupling between the iron(II) ion and the ligand radical was confirmed in 1, with an estimated coupling constant J < -250 cm-1 (J = -657 cm-1, DFT). Calibrated CAS calculations revealed that the ground-state Fe(II)-α-diiminato radical configuration has significant ionic contributions, which are weighted specifically toward the Fe(I)-neutral α-diimine species. Experimental data and theoretical calculations also suggest that 1 possesses an easy-axis anisotropy, with an axial zero-field splitting parameter D in the range from -4 to-1 cm-1. Finally, dynamic magnetic studies show that 1 exhibits slow magnetic relaxation behavior with an energy barrier close to the theoretical maximum, 2|D|. These results demonstrate that incorporating strongly coupled α-diiminato radicals into mononuclear transition metal complexes can be an effective strategy to prepare SMMs.
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Affiliation(s)
- Peng Wang
- Department of Chemistry & Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Mohamed R Saber
- Department of Chemistry, Texas A&M University, College Station, Texas 77842-3012, United States.,Department of Chemistry, Fayoum University, Fayoum 63514, Egypt
| | - Peter E VanNatta
- Department of Chemistry, University of Utah, Salt Lake City, Utah 84112-0850, United States
| | - Glenn P A Yap
- Department of Chemistry & Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Codrina V Popescu
- Department of Chemistry, University of Saint Thomas, 2115 Summit Avenue, Saint Paul, Minnesota 55105, United States
| | - Christopher C Scarborough
- Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, Georgia 30322, United States.,Syngenta Crop Protection AG, Schaffhauserstrasse, CH-4332 Stein, Switzerland
| | | | - Kim R Dunbar
- Department of Chemistry, Texas A&M University, College Station, Texas 77842-3012, United States
| | - Charles G Riordan
- Department of Chemistry & Biochemistry, University of Delaware, Newark, Delaware 19716, United States
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7
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Mono- and Binuclear Copper(II) and Nickel(II) Complexes with the 3,6-Bis(picolylamino)-1,2,4,5-Tetrazine Ligand. Molecules 2021; 26:molecules26082122. [PMID: 33917122 PMCID: PMC8067877 DOI: 10.3390/molecules26082122] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Revised: 03/28/2021] [Accepted: 03/31/2021] [Indexed: 11/30/2022] Open
Abstract
Four new compounds of formulas [Cu(hfac)2(L)] (1), [Ni(hfac)2(L)] (2), [{Cu(hfac)2}2(µ-L)]·2CH3OH (3) and [{Ni(hfac)2}2(µ-L)]·2CH3CN (4) [Hhfac = hexafluoroacetylacetone and L = 3,6-bis(picolylamino)-1,2,4,5-tetrazine] have been prepared and their structures determined by X-ray diffraction on single crystals. Compounds 1 and 2 are isostructural mononuclear complexes where the metal ions [copper(II) (1) and nickel(II) (2)] are six-coordinated in distorted octahedral MN2O4 surroundings which are built by two bidentate hfac ligands plus another bidentate L molecule. This last ligand coordinates to the metal ions through the nitrogen atoms of the picolylamine fragment. Compounds 3 and 4 are centrosymmetric homodinuclear compounds where two bidentate hfac units are the bidentate capping ligands at each metal center and a bis-bidentate L molecule acts as a bridge. The values of the intramolecular metal···metal separation are 7.97 (3) and 7.82 Å (4). Static (dc) magnetic susceptibility measurements were carried out for polycrystalline samples 1–4 in the temperature range 1.9–300 K. Curie law behaviors were observed for 1 and 2, the downturn of χMT in the low temperature region for 2 being due to the zero-field splitting of the nickel(II) ion. Very weak [J = −0.247(2) cm−1] and relatively weak intramolecular antiferromagnetic interactions [J = −4.86(2) cm−1] occurred in 3 and 4, respectively (the spin Hamiltonian being defined as H = −JS1·S2). Simple symmetry considerations about the overlap between the magnetic orbitals across the extended bis-bidentate L bridge in 3 and 4 account for their magnetic properties.
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8
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Guo Z, Deng YF, Pikramenou Z, Dunbar KR, Zhang YZ. Strong Coupling and Slow Relaxation of the Magnetization for an Air-Stable [Co 4] Square with Both Tetrazine Radicals and Azido Bridges. Inorg Chem 2021; 60:3651-3656. [PMID: 33656338 DOI: 10.1021/acs.inorgchem.0c03158] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Introducing both tetrazine radical and azido bridges afforded two air-stable square complexes [MII4(bpztz•-)4(N3)4] (MII = Zn2+, 1; Co2+, 2; bpztz = 3,6-bis(3,5-dimethylpyrazolyl)-1,2,4,5-tetrazine), where the metal ions are cobridged by μ1,1-azido bridges and tetrazine radicals. Magnetic studies revealed strong antiferromagnetic metal-radical interaction with a coupling constant of -64.7 cm-1 in the 2J formalism in 2. Remarkably, 2 exhibits slow relaxation of magnetization with an effective barrier for spin reverse of 96 K at zero applied field.
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Affiliation(s)
- Zhilin Guo
- Department of Chemistry, Southern University of Science and Technology, Shenzhen 518055, China.,School of Chemistry, The University of Birmingham, Edgbaston B15 2TT, United Kingdom
| | - Yi-Fei Deng
- Department of Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
| | - Zoe Pikramenou
- School of Chemistry, The University of Birmingham, Edgbaston B15 2TT, United Kingdom
| | - Kim R Dunbar
- Department of Chemistry, Texas A&M University, College Station, Texas 77842, United States
| | - Yuan-Zhu Zhang
- Department of Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
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9
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Richardson P, Marin R, Zhang Y, Gabidullin B, Ovens J, Moilanen JO, Murugesu M. Asymmetric Ring Opening in a Tetrazine-Based Ligand Affords a Tetranuclear Opto-Magnetic Ytterbium Complex. Chemistry 2021; 27:2361-2370. [PMID: 32926489 DOI: 10.1002/chem.202003556] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Revised: 09/13/2020] [Indexed: 12/15/2022]
Abstract
We report the formation of a tetranuclear lanthanide cluster, [Yb4 (bpzch)2 (fod)10 ] (1), which occurs from a serendipitous ring opening of the functionalised tetrazine bridging ligand, bpztz (3,6-dipyrazin-2-yl-1,2,4,5-tetrazine) upon reacting with Yb(fod)3 (fod- =6,6,7,7,8,8,8-heptafluoro-2,2-dimethyl-3,5-octandionate). Compound 1 was structurally elucidated via single-crystal X-ray crystallography and subsequently magnetically and spectroscopically characterised to analyse its magnetisation dynamics and its luminescence behaviour. Computational studies validate the observed MJ energy levels attained by spectroscopy and provides a clearer picture of the slow relaxation of the magnetisation dynamics and relaxation pathways. These studies demonstrate that 1 acts as a single-molecule magnet (SMM) under an applied magnetic field in which the relaxation occurs via a combination of Raman, direct, and quantum tunnelling processes, a behaviour further rationalised analysing the luminescent properties. This marks the first lanthanide-containing molecule that forms by means of an asymmetric tetrazine decomposition.
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Affiliation(s)
- Paul Richardson
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie-Curie Pvt., Ottawa, ON, K1N 6N5, Canada
| | - Riccardo Marin
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie-Curie Pvt., Ottawa, ON, K1N 6N5, Canada
| | - Yixin Zhang
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie-Curie Pvt., Ottawa, ON, K1N 6N5, Canada
| | - Bulat Gabidullin
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie-Curie Pvt., Ottawa, ON, K1N 6N5, Canada
| | - Jeffrey Ovens
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie-Curie Pvt., Ottawa, ON, K1N 6N5, Canada
| | - Jani O Moilanen
- Department of Chemistry, Nanoscience Centre, University of Jyväskylä, P.O. Box 35, 40014, Jyväskylä, Finland
| | - Muralee Murugesu
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie-Curie Pvt., Ottawa, ON, K1N 6N5, Canada
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Mavragani N, Kitos AA, Brusso JL, Murugesu M. Enhancing Magnetic Communication between Metal Centres: The Role of s-Tetrazine Based Radicals as Ligands. Chemistry 2021; 27:5091-5106. [PMID: 33079452 DOI: 10.1002/chem.202004215] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Revised: 10/19/2020] [Indexed: 12/31/2022]
Abstract
Although 1,2,4,5-tetrazines or s-tetrazines have been known in the literature for more than a century, their coordination chemistry has become increasingly popular in recent years due to their unique redox activity, multiple binding sites and their various applications. The electron-poor character of the ring and stabilization of the radical anion through all four nitrogen atoms in their metal complexes provide new aspects in molecular magnetism towards the synthesis of new high performing Single Molecule Magnets (SMMs). The scope of this review is to examine the role of s-tetrazine radical ligands in transition metal and lanthanide based SMMs and provide a critical overview of the progress thus far in this field. As well, general synthetic routes and new insights for the preparation of s-tetrazines are discussed, along with their redox activity and applications in various fields. Concluding remarks along with the limitations and perspectives of these ligands are discussed.
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Affiliation(s)
- Niki Mavragani
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie Curie, Ottawa, Ontario, K1N 6N5, Canada
| | - Alexandros A Kitos
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie Curie, Ottawa, Ontario, K1N 6N5, Canada
| | - Jaclyn L Brusso
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie Curie, Ottawa, Ontario, K1N 6N5, Canada
| | - Muralee Murugesu
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie Curie, Ottawa, Ontario, K1N 6N5, Canada
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11
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Stetsiuk O, Abhervé A, Avarvari N. 1,2,4,5-Tetrazine based ligands and complexes. Dalton Trans 2020; 49:5759-5777. [PMID: 32239040 DOI: 10.1039/d0dt00827c] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
One of the most intriguing nitrogen based aromatic heterocycles is 1,2,4,5-tetrazine or s-tetrazine (TTZ) thanks to its electron acceptor character and fluorescence properties and the possibilities of functionalization in the 3 and 6 positions allowing access to various ligands. In this review we focus on the two main families of TTZ based ligands, i.e. ditopic symmetric and monotopic non-symmetric, together with their metal complexes, with a special emphasis on their solid state structures and physical properties. After a description of the most representative complexes containing unsubstituted TTZ as a ligand, symmetric TTZ ligands and complexes derived thereof are discussed in the order: 3,6-bis(2-pyridyl)-tetrazine, 3,6-bis(3-pyridyl)-tetrazine, 3,6-bis(4-pyridyl)-tetrazine, 3,6-bis(2-pyrimidyl)-tetrazine, 3,6-bis(2-pyrazinyl)-tetrazine, 3,6-bis(monopicolylamine)-tetrazine, 3,6-bis(vanillin-hydrazinyl)-tetrazine and TTZ containing carboxylic acids. Remarkable results have been obtained in recent years for metal-organic frameworks and magnetic compounds in which magnetic coupling is enhanced when the tetrazine bridge is reduced to radical anions. Non-symmetric ligands, such as dipicolylamine-TTZ and monopicolylamine-TTZ, are comparatively more recent than the symmetric ones. They allow in principle the preparation of mononuclear complexes in a controlled manner, although binuclear complexes have been isolated as well. Moreover, in the monopicolylamine-TTZ-Cl ligand, deprotonation of the amine, thanks to the electron acceptor character of TTZ, afforded a negatively charged ligand equivalent of a guanidinate.
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Affiliation(s)
- Oleh Stetsiuk
- MOLTECH-Anjou, UMR 6200, CNRS, UNIV Angers, 2 bd Lavoisier, 49045 ANGERS Cedex, France.
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12
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Lemes MA, Mavragani N, Richardson P, Zhang Y, Gabidullin B, Brusso JL, Moilanen JO, Murugesu M. Unprecedented intramolecular pancake bonding in a {Dy2} single-molecule magnet. Inorg Chem Front 2020. [DOI: 10.1039/d0qi00365d] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The first example of unique coordination induced intramolecular pancake bonding was achieved through the reduction of two bis(pyrazolyl)-tetrazine ligands.
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Affiliation(s)
- Maykon A. Lemes
- Department of Chemistry and Biomolecular Sciences. University of Ottawa
- ON
- Canada
| | - Niki Mavragani
- Department of Chemistry and Biomolecular Sciences. University of Ottawa
- ON
- Canada
| | - Paul Richardson
- Department of Chemistry and Biomolecular Sciences. University of Ottawa
- ON
- Canada
| | - Yixin Zhang
- Department of Chemistry and Biomolecular Sciences. University of Ottawa
- ON
- Canada
| | - Bulat Gabidullin
- Department of Chemistry and Biomolecular Sciences. University of Ottawa
- ON
- Canada
| | - Jaclyn L. Brusso
- Department of Chemistry and Biomolecular Sciences. University of Ottawa
- ON
- Canada
| | - Jani O. Moilanen
- Department of Chemistry
- Nanoscience Centre
- University of Jyväskylä
- FI-40014
- Finland
| | - Muralee Murugesu
- Department of Chemistry and Biomolecular Sciences. University of Ottawa
- ON
- Canada
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Alexandropoulos DI, Vignesh KR, Xie H, Dunbar KR. Quinoxaline radical-bridged transition metal complexes with very strong antiferromagnetic coupling. Chem Commun (Camb) 2020; 56:9122-9125. [DOI: 10.1039/d0cc03713c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Synthesis, magnetic studies and, theoretical calculations of a new family of transition metal complexes bridged by a quinoxaline-based radical.
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Affiliation(s)
| | | | - Haomiao Xie
- Department of Chemistry
- Texas A&M University
- College Station
- USA
| | - Kim R. Dunbar
- Department of Chemistry
- Texas A&M University
- College Station
- USA
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14
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Gransbury GK, Boulon ME, Mole RA, Gable RW, Moubaraki B, Murray KS, Sorace L, Soncini A, Boskovic C. Single-ion anisotropy and exchange coupling in cobalt(ii)-radical complexes: insights from magnetic and ab initio studies. Chem Sci 2019; 10:8855-8871. [PMID: 31803460 PMCID: PMC6853083 DOI: 10.1039/c9sc00914k] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Accepted: 07/27/2019] [Indexed: 01/18/2023] Open
Abstract
The concurrent effects of single-ion anisotropy and exchange interactions on the electronic structure and magnetization dynamics have been analyzed for a cobalt(ii)-semiquinonate complex. Analogs containing diamagnetic catecholate and tropolonate ligands were employed for comparison of the magnetic behavior and zinc congeners assisted with the spectroscopic characterization and assessment of intermolecular interactions in the cobalt(ii) compounds. Low temperature X-band (ν ≈ 9.4 GHz) and W-Band (ν ≈ 94 GHz) electron paramagnetic resonance spectroscopy and static and dynamic magnetic measurements have been used to elucidate the electronic structure of the high spin cobalt(ii) ion in [Co(Me3tpa)(Br4cat)] (1; Me3tpa = tris[(6-methyl-2-pyridyl)methyl]amine, Br4cat2- = tetrabromocatecholate) and [Co(Me3tpa)(trop)](PF6) (2(PF6); trop- = tropolonate), which show slow relaxation of the magnetization in applied field. The cobalt(ii)-semiquinonate exchange interaction in [Co(Me3tpa)(dbsq)](PF6)·tol (3(PF6)·tol; dbsq- = 3,5-di-tert-butylsemiquinonate, tol = toluene) has been determined using an anisotropic exchange Hamiltonian in conjunction with multistate restricted active space self-consistent field ab initio modeling and wavefunction analysis, with comparison to magnetic and inelastic neutron scattering data. Our results demonstrate dominant ferromagnetic exchange for 3+ that is of similar magnitude to the anisotropy parameters of the cobalt(ii) ion and contains a significant contribution from spin-orbit coupling. The nature of the exchange coupling between octahedral high spin cobalt(ii) and semiquinonate ligands is a longstanding question; answering this question for the specific case of 3+ has confirmed the considerable sensitivity of the exchange to the molecular structure. The methodology employed will be generally applicable for elucidating exchange coupling between orbitally-degenerate metal ions and radical ligands and relevant to the development of bistable molecules and their integration into devices.
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Affiliation(s)
- Gemma K Gransbury
- School of Chemistry , University of Melbourne , Parkville , Victoria 3010 , Australia .
| | - Marie-Emmanuelle Boulon
- UdR INSTM , Department of Chemistry "U. Schiff" , University of Florence , 50019 Sesto Fiorentino (FI) , Italy
| | - Richard A Mole
- Australian Nuclear Science and Technology Organisation , Locked Bag 2001 , Kirrawee DC , New South Wales 2232 , Australia
| | - Robert W Gable
- School of Chemistry , University of Melbourne , Parkville , Victoria 3010 , Australia .
| | - Boujemaa Moubaraki
- School of Chemistry , Monash University , Clayton , Victoria 3800 , Australia
| | - Keith S Murray
- School of Chemistry , Monash University , Clayton , Victoria 3800 , Australia
| | - Lorenzo Sorace
- UdR INSTM , Department of Chemistry "U. Schiff" , University of Florence , 50019 Sesto Fiorentino (FI) , Italy
| | - Alessandro Soncini
- School of Chemistry , University of Melbourne , Parkville , Victoria 3010 , Australia .
| | - Colette Boskovic
- School of Chemistry , University of Melbourne , Parkville , Victoria 3010 , Australia .
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15
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Dipicolylamino-methoxy-1,2,4,5-tetrazine ligand and its metal complexes: Structural and photophysical studies. Polyhedron 2019. [DOI: 10.1016/j.poly.2019.05.050] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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16
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Shi T, Xu Y, Zou YJ, Wang ZX. Synthesis, structure and magnetic properties of copper(ii) azide. Dalton Trans 2019; 48:11186-11190. [PMID: 31273361 DOI: 10.1039/c9dt01450k] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel azide-bridged copper compound without an auxiliary ligand has been synthesized and characterized by single-crystal diffraction analysis. The compound consists of 1D double chains with end-on (EO) azide bridges. Furthermore, the neighboring chains are connected by weak coordination bonds, which leads to the formation of a 3D architecture. Low-temperature magnetic measurements reveal that antiferromagnetic interactions are dominant, with concomitant spin-canted antiferromagnetism.
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Affiliation(s)
- Taqing Shi
- School of Pharmacy, Guangdong Medical University, Dongguan 523800, People's Republic of China
| | - Ye Xu
- Department of Chemistry, Centre for Supramolecular Chemistry and Catalysis, Innovative Drug Research Centre, Shanghai University, Shanghai 200444, People's Republic of China.
| | - Ya-Jing Zou
- Department of Chemistry, Centre for Supramolecular Chemistry and Catalysis, Innovative Drug Research Centre, Shanghai University, Shanghai 200444, People's Republic of China.
| | - Zhao-Xi Wang
- Department of Chemistry, Centre for Supramolecular Chemistry and Catalysis, Innovative Drug Research Centre, Shanghai University, Shanghai 200444, People's Republic of China.
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17
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Stetsiuk O, Petrusenko SR, Sorace L, Lupan A, Attia AAA, Kokozay VN, El-Ghayoury A, Avarvari N. Versatile coordination behaviour of the chloro-tetrazine-picolylamine ligand: mixed-valence binuclear Cu(i)/Cu(ii) complexes. Dalton Trans 2019; 48:11966-11977. [PMID: 31313787 DOI: 10.1039/c9dt02379h] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The 3-Cl-6-amino-(2'-picolyl)-1,2,4,5-tetrazine ligand HL1 has been synthesized and structurally characterized. Its versatile coordination behavior has been evidenced through reactions with Cu(Hfac)2 and Cu(triflate)2 precursors, which provided mixed-valence bimetallic Cu1.5Cu1.5 complexes [Cu2(μ-Cl)(L1)2] 2 and [Cu2(μ-triflate)(L1)2] 5. Changing the Cu(ii) precursor and the solvent leads to the formation of mononuclear octahedral Cu(ii) complexes [CuCl2(HL1)2]·2CH3CN 3 and [Cu(Hfac)2(HL1)] 4, in which only the amino-pyridine unit is involved in the coordination of the metal center. In contrast, in complexes 2 and 5, the ligands are deprotonated and bridge the metal centers as pyridine-amido-tetrazine fragments, while a bridging chloride or triflate ligand completes the coordination sphere of the metal ions. The Cu-Cu distances of 2.4313(4) Å in 2 and 2.5198(10) Å in 5 lie among the shorter values within mixed-valence bimetallic Cu complexes. Mixed-valence character is strongly supported by DFT calculations, showing the equal repartition of the unpaired electron between the two metal centers.
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Affiliation(s)
- Oleh Stetsiuk
- MOLTECH-Anjou, UMR 6200, CNRS, UNIV Angers, 2 bd Lavoisier, 49045 ANGERS Cedex, France. and Department of Inorganic Chemistry, Taras Shevchenko National University of Kyiv, Volodymyrska str. 64/13, Kyiv 01601, Ukraine
| | - Svitlana R Petrusenko
- Department of Inorganic Chemistry, Taras Shevchenko National University of Kyiv, Volodymyrska str. 64/13, Kyiv 01601, Ukraine
| | - Lorenzo Sorace
- Dipartimento di Chimica "Ugo Schiff" and UdR INSTM, Università di Firenze, 50019 Sesto Fiorentino, Italy
| | - Alexandru Lupan
- Faculty of Chemistry and Chemical Engineering, Babes-Bolyai University, Cluj-Napoca, Romania
| | - Amr A A Attia
- Faculty of Chemistry and Chemical Engineering, Babes-Bolyai University, Cluj-Napoca, Romania
| | - Vladimir N Kokozay
- Department of Inorganic Chemistry, Taras Shevchenko National University of Kyiv, Volodymyrska str. 64/13, Kyiv 01601, Ukraine
| | - Abdelkrim El-Ghayoury
- MOLTECH-Anjou, UMR 6200, CNRS, UNIV Angers, 2 bd Lavoisier, 49045 ANGERS Cedex, France.
| | - Narcis Avarvari
- MOLTECH-Anjou, UMR 6200, CNRS, UNIV Angers, 2 bd Lavoisier, 49045 ANGERS Cedex, France.
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18
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Wang Y, Li J, Zhang L, Chen C, Feng R, Zhao Y, Zhang YQ, Tan G, Song Y, Wang X. Magnetic on-off switching in redox non-innocent ligand bridged binuclear cobalt complexes. Dalton Trans 2018; 47:17211-17215. [PMID: 30484464 DOI: 10.1039/c8dt04157a] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The redox non-innocent ligand 2,2'-bipyrimidine (bpym) reacted with two molar equivalents of LCo(tol) (L = CH(MeC[double bond, length as m-dash]NAr)2, Ar = 2,6-iPr2C6H3) to afford the binuclear CoII complex (LCo)2(μ-bpym) (1), in which the bpym moiety accepts two electrons from the metal centers and in the dianion state. Complex 1 readily underwent one-electron oxidation when treated with [Cp2Fe]+[BPh4]- affording the cation salt [(LCo)2(μ-bpym)][BPh4] (2) with the bpym moiety in the radical anion state. Meanwhile, complex 2 could be converted back to 1 with elemental potassium. The magnetic studies revealed that complex 2 is a single molecular magnet (SMM) under a small external field, while 1 has no SMM activity. This represents a new example of a SMM exhibiting a fully reversible 'on/off' switching ability in anodic and neutral states.
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Affiliation(s)
- Yichen Wang
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210023, China.
| | - Jing Li
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210023, China.
| | - Li Zhang
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210023, China.
| | - Chao Chen
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210023, China.
| | - Rui Feng
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210023, China.
| | - Yue Zhao
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210023, China.
| | - Yi-Quan Zhang
- Jiangsu Key Laboratory for NSLSCS, School of Physical Science and Technology, Nanjing Normal University, Nanjing 210023, China
| | - Gengwen Tan
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210023, China.
| | - You Song
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210023, China.
| | - Xinping Wang
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210023, China.
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19
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Brunet G, Hamwi M, Lemes MA, Gabidullin B, Murugesu M. A tunable lanthanide cubane platform incorporating air-stable radical ligands for enhanced magnetic communication. Commun Chem 2018. [DOI: 10.1038/s42004-018-0090-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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20
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Tempas CD, Skomski D, Cook BJ, Le D, Smith KA, Rahman TS, Caulton KG, Tait SL. Redox Isomeric Surface Structures Are Preferred over Odd‐Electron Pt
1+. Chemistry 2018; 24:15852-15858. [DOI: 10.1002/chem.201802943] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2018] [Indexed: 11/11/2022]
Affiliation(s)
| | - Daniel Skomski
- Department of Chemistry Indiana University Bloomington Indiana 47405 USA
- Current address: Merck and Co. 770 Sumneytown Pike West Point Pennsylvania 19486 USA
| | - Brian J. Cook
- Department of Chemistry Indiana University Bloomington Indiana 47405 USA
- Current address: Center for Catalysis and Florida Center for Heterocyclic Compounds University of Florida Gainesville Florida 32611 USA
| | - Duy Le
- Department of Physics University of Central Florida Orlando Florida 32816 USA
| | - Kevin A. Smith
- Department of Physics Indiana University Bloomington Indiana 47405 USA
| | - Talat S. Rahman
- Department of Physics University of Central Florida Orlando Florida 32816 USA
- Department of Physics University of California, Berkeley Berkeley California 94720 USA
| | - Kenneth G. Caulton
- Department of Chemistry Indiana University Bloomington Indiana 47405 USA
| | - Steven L. Tait
- Department of Chemistry Indiana University Bloomington Indiana 47405 USA
- Department of Physics Indiana University Bloomington Indiana 47405 USA
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21
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Kojima T, Ogishima F, Nishibu T, Kotani H, Ishizuka T, Okajima T, Nozawa S, Shiota Y, Yoshizawa K, Ohtsu H, Kawano M, Shiga T, Oshio H. Intermediate-Spin Iron(III) Complexes Having a Redox-Noninnocent Macrocyclic Tetraamido Ligand. Inorg Chem 2018; 57:9683-9695. [DOI: 10.1021/acs.inorgchem.8b00037] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Takahiko Kojima
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8571, Japan
- CREST, Japan Science and Technology Agency, 4 Chome-1-8, Kawaguchi, Honcho, Saitama 332-0012, Japan
| | - Fumiya Ogishima
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8571, Japan
| | - Takahisa Nishibu
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8571, Japan
| | - Hiroaki Kotani
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8571, Japan
| | - Tomoya Ishizuka
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8571, Japan
| | - Toshihiro Okajima
- Kyushu Synchrotron Light Research Center, 8-7 Yayoigaoka, Tosu, Saga 841-0005, Japan
| | - Shunsuke Nozawa
- Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
| | - Yoshihito Shiota
- Institute for Materials Chemistry and Engineering, Kyushu University, Motooka, Nishi-Ku, Fukuoka 819-0395, Japan
| | - Kazunari Yoshizawa
- CREST, Japan Science and Technology Agency, 4 Chome-1-8, Kawaguchi, Honcho, Saitama 332-0012, Japan
- Institute for Materials Chemistry and Engineering, Kyushu University, Motooka, Nishi-Ku, Fukuoka 819-0395, Japan
| | - Hiroyoshi Ohtsu
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan
| | - Masaki Kawano
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan
| | - Takuya Shiga
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8571, Japan
| | - Hiroki Oshio
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8571, Japan
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22
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Lemes MA, Stein HN, Gabidullin B, Robeyns K, Clérac R, Murugesu M. Probing Magnetic-Exchange Coupling in Supramolecular Squares Based on Reducible Tetrazine-Derived Ligands. Chemistry 2018; 24:4259-4263. [PMID: 29430742 DOI: 10.1002/chem.201800126] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2018] [Indexed: 12/12/2022]
Abstract
Reducible 3,6-bis(3,5-dimethyl-pyrazolyl)1,2,4,5-tetrazine was employed to isolate supramolecular air-stable [Co4 ] and [Zn4 ] squares, which were achieved via careful selection of counterions rather than the use of reducing agents. Magnetic susceptibility studies revealed a strong radical-CoII exchange coupling (Jrad-Co /hc=-118 cm-1 , -2J formalism) with a spin ground state of ST =4, whereas the unreduced analogue revealed negligible coupling between the Co centers (JCo-Co /hc=-0.64 cm-1 ). Radical-radical coupling was also probed in the [Zn4 ] congener, which led to Jrad-rad /hc=-15.9(5) cm-1 . These results highlight the versatile air-stable coordination chemistry of tetrazine and the importance of exploiting easily reducible delocalized radical to promote strong exchange coupling between spin carriers.
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Affiliation(s)
- Maykon A Lemes
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, D'lorio Hall, 10 Marie Curie, Ottawa, ON, K1N6N5, Canada
| | - Hilarie N Stein
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, D'lorio Hall, 10 Marie Curie, Ottawa, ON, K1N6N5, Canada
| | - Bulat Gabidullin
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, D'lorio Hall, 10 Marie Curie, Ottawa, ON, K1N6N5, Canada
| | - Koen Robeyns
- Institute of Condensed Matter and Nanosciences, MOST-Inorganic Chemistry, Université catholique de Louvain, Place L. Pasteur 1, 1348, Louvain-la-Neuve, Belgium
| | - Rodolphe Clérac
- CNRS, CRPP, UMR 5031, 33600, Pessac, France.,Univ. Bordeaux, CRPP, UMR 5031, 33600, Pessac, France
| | - Muralee Murugesu
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, D'lorio Hall, 10 Marie Curie, Ottawa, ON, K1N6N5, Canada
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23
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Wang ZX, Wu LF, Zhang X, Xing F, Li MX. Structural diversity and magnetic properties of six cobalt coordination polymers based on 2,2'-phosphinico-dibenzoate ligand. Dalton Trans 2018; 45:19500-19510. [PMID: 27896355 DOI: 10.1039/c6dt04010a] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Six novel Co(ii) coordination polymers, namely, [Co10L6(OH)2(H2O)9]·10.5H2O (1), [Co3L2(3-abpt)2]·4H2O (2), [Co3L2(4-azpy)2(H2O)2(EtOH)] (3), [Co3L2(4,4'-bipy)2(H2O)2(MeCN)] (4), [Co3L2(4,4'-bipy)2] (5), and [Co5L2(OH)2(ina)2(H2O)2] (6) (H3L = 2,2'-phosphinico-dibenzoic acid, 3-abpt = 4-amino-3,5-bis(3-pyridyl)-1,2,4-triazole, 4-azpy = 4,4'-azobispyridine, 4,4'-bipy = 4,4'-bipyridine, Hina = isonicotinic acid), have been hydrothermally synthesized and their magnetic properties have been characterized. The L3- anion displays six types of coordination modes in the compounds. Compound 1 exhibits a novel 1D ladder-like structure, which consists of non-centrosymmetric Co10 units. Compounds 2-4 comprise 2D networks assembled from Co3L2 chains and N-heterocyclic linkers. Compound 5 comprises a 3D framework built from six neighboring parallel Co3L2 ladders bridged by 4,4'-bipy linkers. Compound 6 features a 3D framework that exhibits pcu topology with the Schläfli symbol of (412·63) using a pentanuclear [Co5(OH)2]8+ cluster as the node. Variable-temperature magnetic susceptibility studies indicate that the six coordination polymers exhibit remarkable magnetic behavior such as spin-canted antiferromagnetism and spin glass, which were found to coexist in compound 6.
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Affiliation(s)
- Zhao-Xi Wang
- Department of Chemistry, Center for Supramolecular Chemistry and Catalysis, Innovative Drug Research Center, Shanghai University, Shanghai 200444, People's Republic of China. and State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing 210093, People's Republic of China
| | - Lin-Fei Wu
- Department of Chemistry, Center for Supramolecular Chemistry and Catalysis, Innovative Drug Research Center, Shanghai University, Shanghai 200444, People's Republic of China.
| | - Xuan Zhang
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, TX 77842-3012, USA
| | - Feifei Xing
- Department of Chemistry, Center for Supramolecular Chemistry and Catalysis, Innovative Drug Research Center, Shanghai University, Shanghai 200444, People's Republic of China.
| | - Ming-Xing Li
- Department of Chemistry, Center for Supramolecular Chemistry and Catalysis, Innovative Drug Research Center, Shanghai University, Shanghai 200444, People's Republic of China.
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24
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Stetsiuk O, El-Ghayoury A, Lloret F, Julve M, Avarvari N. Mononuclear and One-Dimensional Cobalt(II) Complexes with the 3,6-Bis(picolylamino)-1,2,4,5-tetrazine Ligand. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201701224] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Oleh Stetsiuk
- Laboratoire MOLTECH-Anjou, UMR 6200; CNRS Université d'Angers, UFR Sciences, Bât. K; 2 Bd. Lavoisier 49045 Angers France
- Department of Inorganic Chemistry; Taras Shevchenko National University of Kyiv; Volodymyrska str. 64/13 01601 Kyiv Ukraine
| | - Abdelkrim El-Ghayoury
- Laboratoire MOLTECH-Anjou, UMR 6200; CNRS Université d'Angers, UFR Sciences, Bât. K; 2 Bd. Lavoisier 49045 Angers France
| | - Francesc Lloret
- Instituto de Ciencia Molecular (ICMol)/Departament de Química Inorgànica; Universitat de València; C/Catedrático José Beltrán 2 46980 Paterna (Valencia) Spain
| | - Miguel Julve
- Instituto de Ciencia Molecular (ICMol)/Departament de Química Inorgànica; Universitat de València; C/Catedrático José Beltrán 2 46980 Paterna (Valencia) Spain
| | - Narcis Avarvari
- Laboratoire MOLTECH-Anjou, UMR 6200; CNRS Université d'Angers, UFR Sciences, Bât. K; 2 Bd. Lavoisier 49045 Angers France
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25
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Woods TJ, Stout HD, Dolinar BS, Vignesh KR, Ballesteros-Rivas MF, Achim C, Dunbar KR. Strong Ferromagnetic Exchange Coupling Mediated by a Bridging Tetrazine Radical in a Dinuclear Nickel Complex. Inorg Chem 2017; 56:12094-12097. [PMID: 28945087 DOI: 10.1021/acs.inorgchem.7b01812] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The radical bridged compound [(Ni(TPMA))2-μ-bmtz•-](BF4)3·3CH3CN (bmtz = 3,6-bis(2'-pyrimidyl)-1,2,4,5-tetrazine, TPMA = tris(2-pyridylmethyl)amine) exhibits strong ferromagnetic exchange between the S = 1 NiII centers and the bridging S = 1/2 bmtz radical with J = 96 ± 5 cm-1 (-2JNi-radSNiSrad). DFT calculations support the existence of strong ferromagnetic exchange.
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Affiliation(s)
- Toby J Woods
- Department of Chemistry, Texas A&M University , College Station, Texas 77842-3012, United States
| | - Heather D Stout
- Department of Chemistry, Carnegie Mellon University , Pittsburgh, Pennsylvania 15213, United States
| | - Brian S Dolinar
- Department of Chemistry, Texas A&M University , College Station, Texas 77842-3012, United States
| | - Kuduva R Vignesh
- Department of Chemistry, Texas A&M University , College Station, Texas 77842-3012, United States
| | | | - Catalina Achim
- Department of Chemistry, Carnegie Mellon University , Pittsburgh, Pennsylvania 15213, United States
| | - Kim R Dunbar
- Department of Chemistry, Texas A&M University , College Station, Texas 77842-3012, United States
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26
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Alexandropoulos DI, Dolinar BS, Vignesh KR, Dunbar KR. Putting a New Spin on Supramolecular Metallacycles: Co 3 Triangle and Co 4 Square Bearing Tetrazine-Based Radicals as Bridges. J Am Chem Soc 2017; 139:11040-11043. [PMID: 28728414 DOI: 10.1021/jacs.7b06925] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The synthesis of two new radical-bridged compounds [Co3(bptz)3(dbm)3]·2toluene (1) and [Co4(bptz)4(dbm)4]·4MeCN (2) (bptz = 3,6-bis(pyridyl)-1,2,4,5-tetrazine; dbm = 1,3-diphenyl-1,3-propanedionate) is reported. The presence of the ligand-centered radical has been confirmed by X-ray crystallography and SQUID magnetometry. These complexes are the first metallacycles bearing nitrogen heterocyclic radicals as bridges. Magnetic studies reveal strong antiferromagnetic metal···radical coupling with coupling constants of J = -67.5 and -66.8 cm-1 for 1 and 2, respectively. DFT calculations further support the strong antiferromagnetic coupling between CoII ions and bptz radicals and confirm S = 3 and S = 4 spin ground states for 1 and 2, respectively.
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Affiliation(s)
| | - Brian S Dolinar
- Department of Chemistry, Texas A&M University , College Station, Texas 77842-3012, United States
| | - Kuduva R Vignesh
- Department of Chemistry, Texas A&M University , College Station, Texas 77842-3012, United States
| | - Kim R Dunbar
- Department of Chemistry, Texas A&M University , College Station, Texas 77842-3012, United States
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27
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Lemes MA, Brunet G, Pialat A, Ungur L, Korobkov I, Murugesu M. Strong ferromagnetic exchange coupling in a {Ni} cluster mediated through an air-stable tetrazine-based radical anion. Chem Commun (Camb) 2017; 53:8660-8663. [PMID: 28718476 DOI: 10.1039/c7cc04554a] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A planar tetradentate 3,6-bis(2-pyrimidyl)-1,2,4,5-tetrazine (BpymTz) templating chelate affords the formation of an unprecedented BpymTz˙- radical anion bridged {Ni} complex. Detailed magnetic measurements performed on the isolated air stable [Ni(BpymTz˙-)Cl6(DMF)8]Cl·0.5(H2O) compound reveal strong ferromagnetic NiII-BpymTz˙- interactions with a coupling constant of J = 98.84 cm-1.
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Affiliation(s)
- Maykon A Lemes
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, ON K1N 6N5, Canada.
| | - Gabriel Brunet
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, ON K1N 6N5, Canada.
| | - Amélie Pialat
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, ON K1N 6N5, Canada.
| | - Liviu Ungur
- Theory of Nanomaterials Group and INPC - Institute for Nanoscale Physics and Chemistry, Katholieke Universitiet Leuven, Celestijnenlaan, 200F, 3001 Leuven, Belgium
| | - Ilia Korobkov
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, ON K1N 6N5, Canada.
| | - Muralee Murugesu
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, ON K1N 6N5, Canada.
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28
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Zhang D, Bousquet B, Mulatier JC, Pitrat D, Jean M, Vanthuyne N, Guy L, Dutasta JP, Martinez A. Synthesis, Resolution, and Absolute Configuration of Chiral Tris(2-pyridylmethyl)amine-Based Hemicryptophane Molecular Cages. J Org Chem 2017; 82:6082-6088. [PMID: 28481535 DOI: 10.1021/acs.joc.7b00559] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The synthesis, characterization, and chiroptical properties of a new class of hemicryptophane cages combining a cyclotriveratrylene unit and a tris(2-pyridylmethyl)amine (TPA) moiety are reported. Changing the linkers between these two units allows for the modification of the size and shape of the cavity. The synthesis is straightforward and efficient, providing gram-scale of cage compounds. The racemic mixture of each hemicryptophane host can be readily resolved by chiral HPLC, giving an easy access to the enantiopure molecular cages of which absolute configurations have been assigned by ECD spectroscopy. These new hemicryptophanes are available chemical platforms ready to use for various purposes due to the versatile metal complexation properties of the TPA unit. A Zn(II)@hemicryptophane complex has been obtained and used as a heteroditopic host for the selective recognition of zwitterionic guests.
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Affiliation(s)
- Dawei Zhang
- Laboratoire de Chimie, École Normale Supérieure de Lyon, CNRS, UCBL , 46 allée d'Italie, F-69364 Lyon, France
| | - Benjamin Bousquet
- Laboratoire de Chimie, École Normale Supérieure de Lyon, CNRS, UCBL , 46 allée d'Italie, F-69364 Lyon, France
| | - Jean-Christophe Mulatier
- Laboratoire de Chimie, École Normale Supérieure de Lyon, CNRS, UCBL , 46 allée d'Italie, F-69364 Lyon, France
| | - Delphine Pitrat
- Laboratoire de Chimie, École Normale Supérieure de Lyon, CNRS, UCBL , 46 allée d'Italie, F-69364 Lyon, France
| | - Marion Jean
- Aix Marseille Univ, CNRS , Centrale Marseille, iSm2, Marseille, France
| | - Nicolas Vanthuyne
- Aix Marseille Univ, CNRS , Centrale Marseille, iSm2, Marseille, France
| | - Laure Guy
- Laboratoire de Chimie, École Normale Supérieure de Lyon, CNRS, UCBL , 46 allée d'Italie, F-69364 Lyon, France
| | - Jean-Pierre Dutasta
- Laboratoire de Chimie, École Normale Supérieure de Lyon, CNRS, UCBL , 46 allée d'Italie, F-69364 Lyon, France
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29
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Liu JJ, Jiang SD, Neugebauer P, van Slageren J, Lan Y, Wernsdorfer W, Wang BW, Gao S. Magnetic and HFEPR Studies of Exchange Coupling in a Series of μ-Cl Dicobalt Complexes. Inorg Chem 2017; 56:2417-2425. [DOI: 10.1021/acs.inorgchem.6b02368] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jia-Jia Liu
- National Laboratory for Molecular Sciences, State Key
Laboratory of Rare Earth Materials Chemistry and Applications, College
of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China
| | - Shang-Da Jiang
- National Laboratory for Molecular Sciences, State Key
Laboratory of Rare Earth Materials Chemistry and Applications, College
of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China
| | - Petr Neugebauer
- Institut für Physikalische Chemie, Universität Stuttgart, Pfaffenwaldring 55, Stuttgart D-70569, Germany
| | - Joris van Slageren
- Institut für Physikalische Chemie, Universität Stuttgart, Pfaffenwaldring 55, Stuttgart D-70569, Germany
| | - Yanhua Lan
- Institut Néel−CNRS, 25 Avenue des Martyrs, BP 166, 38042 Grenoble Cedex 9, France
| | - Wolfgang Wernsdorfer
- Institut Néel−CNRS, 25 Avenue des Martyrs, BP 166, 38042 Grenoble Cedex 9, France
| | - Bing-Wu Wang
- National Laboratory for Molecular Sciences, State Key
Laboratory of Rare Earth Materials Chemistry and Applications, College
of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China
| | - Song Gao
- National Laboratory for Molecular Sciences, State Key
Laboratory of Rare Earth Materials Chemistry and Applications, College
of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China
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30
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Dolinar BS, Gómez-Coca S, Alexandropoulos DI, Dunbar KR. An air stable radical-bridged dysprosium single molecule magnet and its neutral counterpart: redox switching of magnetic relaxation dynamics. Chem Commun (Camb) 2017; 53:2283-2286. [DOI: 10.1039/c6cc09824j] [Citation(s) in RCA: 68] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Addition of a radical to the bridging tetrazine ligand of a Dy2 complex dramatically alters the magnetic properties. The radical complex undergoes magnetic relaxation via a thermal relaxation pathway, whereas the neutral compound relaxes via quantum tunneling of the magnetization.
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Affiliation(s)
| | | | | | - Kim R. Dunbar
- Department of Chemistry
- Texas A&M University
- College Station
- USA
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31
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Ansari MA, Mandal A, Beyer K, Paretzki A, Schwederski B, Kaim W, Lahiri GK. Non-innocence and mixed valency in tri- and tetranuclear ruthenium complexes of a heteroquinone bridging ligand. Dalton Trans 2017; 46:15589-15598. [DOI: 10.1039/c7dt03509h] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The potential of a heteroquinone to bridge up to four metal fragments has been structurally elucidated and multiple redox processes have been ascertained.
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Affiliation(s)
- Mohd. Asif Ansari
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai 400076
- India
| | - Abhishek Mandal
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai 400076
- India
| | - Katharina Beyer
- Institut für Anorganische Chemie
- Universität Stuttgart
- D-70550 Stuttgart
- Germany
| | - Alexa Paretzki
- Institut für Anorganische Chemie
- Universität Stuttgart
- D-70550 Stuttgart
- Germany
| | | | - Wolfgang Kaim
- Institut für Anorganische Chemie
- Universität Stuttgart
- D-70550 Stuttgart
- Germany
| | - Goutam Kumar Lahiri
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai 400076
- India
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32
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Lacelle T, Brunet G, Pialat A, Holmberg RJ, Lan Y, Gabidullin B, Korobkov I, Wernsdorfer W, Murugesu M. Single-molecule magnet behaviour in a tetranuclear DyIII complex formed from a novel tetrazine-centered hydrazone Schiff base ligand. Dalton Trans 2017; 46:2471-2478. [DOI: 10.1039/c6dt04413a] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
A tetranuclear dysprosium complex, bridged by a novel tetrazine-centered Schiff base ligand, exhibits ferromagnetic exchange coupling and a large anisotropic barrier.
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Affiliation(s)
- T. Lacelle
- Department of Chemistry and Biomolecular Sciences
- University of Ottawa
- Ottawa
- Canada
| | - G. Brunet
- Department of Chemistry and Biomolecular Sciences
- University of Ottawa
- Ottawa
- Canada
| | - A. Pialat
- Department of Chemistry and Biomolecular Sciences
- University of Ottawa
- Ottawa
- Canada
| | - R. J. Holmberg
- Department of Chemistry and Biomolecular Sciences
- University of Ottawa
- Ottawa
- Canada
| | - Y. Lan
- Institut Néel
- CNRS and Université Grenoble Alpes
- 38042 Grenoble
- France
| | - B. Gabidullin
- Department of Chemistry and Biomolecular Sciences
- University of Ottawa
- Ottawa
- Canada
| | - I. Korobkov
- Department of Chemistry and Biomolecular Sciences
- University of Ottawa
- Ottawa
- Canada
| | - W. Wernsdorfer
- Institut Néel
- CNRS and Université Grenoble Alpes
- 38042 Grenoble
- France
- Physikalisches Institut
| | - M. Murugesu
- Department of Chemistry and Biomolecular Sciences
- University of Ottawa
- Ottawa
- Canada
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33
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Vaidya S, Tewary S, Singh SK, Langley SK, Murray KS, Lan Y, Wernsdorfer W, Rajaraman G, Shanmugam M. What Controls the Sign and Magnitude of Magnetic Anisotropy in Tetrahedral Cobalt(II) Single-Ion Magnets? Inorg Chem 2016; 55:9564-9578. [DOI: 10.1021/acs.inorgchem.6b01073] [Citation(s) in RCA: 84] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shefali Vaidya
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, Maharashtra India
| | - Subrata Tewary
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, Maharashtra India
| | - Saurabh Kumar Singh
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, Maharashtra India
| | - Stuart K. Langley
- School
of Science and the Environment, Chemistry Division, Manchester Metropolitan University, Manchester M15 6HB, U.K
| | - Keith S. Murray
- School
of Chemistry, Monash University, Clayton 3800, Victoria, Australia
| | - Yanhua Lan
- Institut
Néel, CNRS and Université Grenoble Alpes, BP 166,
25 Avenue des Martyrs, 38042 Grenoble Cedex 9, France
| | - Wolfgang Wernsdorfer
- Institut
Néel, CNRS and Université Grenoble Alpes, BP 166,
25 Avenue des Martyrs, 38042 Grenoble Cedex 9, France
| | - Gopalan Rajaraman
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, Maharashtra India
| | - Maheswaran Shanmugam
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, Maharashtra India
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34
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Palii AV, Korchagin DV, Yureva EA, Akimov AV, Misochko EY, Shilov GV, Talantsev AD, Morgunov RB, Aldoshin SM, Tsukerblat BS. Single-Ion Magnet Et4N[CoII(hfac)3] with Nonuniaxial Anisotropy: Synthesis, Experimental Characterization, and Theoretical Modeling. Inorg Chem 2016; 55:9696-9706. [DOI: 10.1021/acs.inorgchem.6b01473] [Citation(s) in RCA: 57] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Andrew V. Palii
- Institute of Problems of Chemical Physics, Chernogolovka, Moscow Region, Russia
- Institute
of Applied Physics, Academy of Sciences of Moldova, Chisinau, Moldova
| | - Denis V. Korchagin
- Institute of Problems of Chemical Physics, Chernogolovka, Moscow Region, Russia
| | - Elena A. Yureva
- Institute of Problems of Chemical Physics, Chernogolovka, Moscow Region, Russia
| | - Alexander V. Akimov
- Institute of Problems of Chemical Physics, Chernogolovka, Moscow Region, Russia
| | | | - Gennady V. Shilov
- Institute of Problems of Chemical Physics, Chernogolovka, Moscow Region, Russia
| | - Artem D. Talantsev
- Institute of Problems of Chemical Physics, Chernogolovka, Moscow Region, Russia
| | - Roman B. Morgunov
- Institute of Problems of Chemical Physics, Chernogolovka, Moscow Region, Russia
| | - Sergey M. Aldoshin
- Institute of Problems of Chemical Physics, Chernogolovka, Moscow Region, Russia
| | - Boris S. Tsukerblat
- Department
of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
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35
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Golla U, Adhikary A, Mondal AK, Tomar RS, Konar S. Synthesis, structure, magnetic and biological activity studies of bis-hydrazone derived Cu(ii) and Co(ii) coordination compounds. Dalton Trans 2016; 45:11849-63. [PMID: 27377047 DOI: 10.1039/c6dt01496h] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Four coordination compounds of formulae [Cu(II)2(H2L(1))(HL(1))](ClO4)3·H2O (1), [Cu(II)2(H2L(2))(CH3OH)2](ClO4)2·2CH3OH (2), [Co(II)2(H2L(1))2](ClO4)4 (3) and [Co(II)2(H2L(2))2]·2H2O (4) were synthesized via self-assembly of succinohydrazone derived ligands (H2L(1) = N',N'-4-bis(2-pyridyl)succinohydrazide, H4L(2) = N',N'-4-bis(2-hydroxybenzylidene)succinohydrazide) and Cu(2+) and Co(2+) ions, respectively. The compounds were characterized by crystal structure determination, magnetic measurements and biological activities. Compounds 1, 3 and 4 have discrete double helicate structures, whereas compound 2 is a one-dimensional chain. Magnetic studies show antiferromagnetic exchange interactions in 2 with a J value of -67.1 cm(-1) and antiferromagnetic spin-canting in compound 3 originates through supramolecular H-bonding. For compound 3, a clear bifurcation was observed in zero field cooled (ZFC) and field cooled (FC) measurement at a temperature of 3.5 K and field of 0.1 T, implying long range magnetic ordering below this temperature. Interestingly, all of compounds 1-4 show significant changes in their absorption (hypo- and hyperchromism) in the presence of SS-DNA, inferring interaction between the compounds and DNA. In addition, compounds 1-4 significantly exhibited nuclease activities on both RNA and pUC19 plasmid DNA. Moreover, the nuclease activity was further enhanced in the presence of oxidant (H2O2) and suggests the possible role of reactive oxygen species in DNA nicking ability of compounds 1-4. Furthermore, compounds 1, 2 and 4 exhibited significant cytotoxicity against mammalian cancer cell lines (HeLa, A549 and MDAMB-231). In addition, our results from Annexin/PI staining and DNA fragmentation assays revealed that these compounds are capable of inducing apoptosis and have potential to act as anticancer drugs.
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36
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Study of a novel hepta-coordinated FeIII bimetallic complex with an unusual 1,2,4,5-tetrazine-ring opening. Polyhedron 2016. [DOI: 10.1016/j.poly.2015.11.024] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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37
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Mandal A, Grupp A, Schwederski B, Kaim W, Lahiri GK. Noninnocently Behaving Bridging Anions of the Widely Distributed Antioxidant Ellagic Acid in Diruthenium Complexes. Inorg Chem 2015; 54:10049-57. [DOI: 10.1021/acs.inorgchem.5b01868] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Abhishek Mandal
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India
| | - Anita Grupp
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550 Stuttgart, Germany
| | - Brigitte Schwederski
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550 Stuttgart, Germany
| | - Wolfgang Kaim
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550 Stuttgart, Germany
| | - Goutam Kumar Lahiri
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India
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