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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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Abnormal magnetic field effects on electrogenerated chemiluminescence. Sci Rep 2015; 5:9105. [PMID: 25772580 PMCID: PMC4360477 DOI: 10.1038/srep09105] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Accepted: 02/16/2015] [Indexed: 11/08/2022] Open
Abstract
We report abnormal magnetic field effects on electrogenerated chemiluminescence (MFEECL) based on triplet emission from the Ru(bpy)3Cl2-TPrA electrochemical system: the appearance of MFEECL after magnetic field ceases. In early studies the normal MFEECL have been observed from electrochemical systems during the application of magnetic field. Here, the abnormal MFEECL suggest that the activated charge-transfer [Ru(bpy)3(3+) … TPrA(•)] complexes may become magnetized in magnetic field and experience a long magnetic relaxation after removing magnetic field. Our analysis indicates that the magnetic relaxation can gradually increase the density of charge-transfer complexes within reaction region due to decayed magnetic interactions, leading to a positive component in the abnormal MFEECL. On the other hand, the magnetic relaxation facilitates an inverse conversion from triplets to singlets within charge-transfer complexes. The inverse triplet → singlet conversion reduces the density of triplet light-emitting states through charge-transfer complexes and gives rise to a negative component in the abnormal MFEECL. The combination of positive and negative components can essentially lead to a non-monotonic profile in the abnormal MFEECL after ceasing magnetic field. Nevertheless, our experimental studies may reveal un-usual magnetic behaviors with long magnetic relaxation from the activated charge-transfer [Ru(bpy)3(3+) … TPrA(•)] complexes in solution at room temperature.
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Gupta SK, Dar AA, Rajeshkumar T, Kuppuswamy S, Langley SK, Murray KS, Rajaraman G, Murugavel R. Discrete {GdIII4M} (M = GdIII or CoII) pentanuclear complexes: a new class of metal-organophosphate molecular coolers. Dalton Trans 2015; 44:5961-5. [DOI: 10.1039/c4dt03655g] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A higher magnetic entropy change is observed for the homometallic {GdIII5} complex (25.8 J kg−1 K−1) as compared to the heterometallic {GdIII4CoII} complex (20.3 J kg−1 K−1).
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Affiliation(s)
- Sandeep K. Gupta
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai
- India
| | - Aijaz A. Dar
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai
- India
| | | | | | | | | | - Gopalan Rajaraman
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai
- India
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Semenov NA, Pushkarevsky NA, Suturina EA, Chulanova EA, Kuratieva NV, Bogomyakov AS, Irtegova IG, Vasilieva NV, Konstantinova LS, Gritsan NP, Rakitin OA, Ovcharenko VI, Konchenko SN, Zibarev AV. Bis(toluene)chromium(I) [1,2,5]Thiadiazolo[3,4-c][1,2,5]thiadiazolidyl and [1,2,5]Thiadiazolo[3,4-b]pyrazinidyl: New Heterospin (S1 = S2 = 1/2) Radical-Ion Salts. Inorg Chem 2013; 52:6654-63. [DOI: 10.1021/ic400659q] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
| | | | | | | | | | | | | | | | | | | | - Oleg A. Rakitin
- Institute of Organic Chemistry, Russian Academy of Sciences, 119991 Moscow, Russia
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Rajeshkumar T, Singh SK, Rajaraman G. A computational perspective on magnetic coupling, magneto-structural correlations and magneto-caloric effect of a ferromagnetically coupled {GdIII–GdIII} Pair. Polyhedron 2013. [DOI: 10.1016/j.poly.2012.06.017] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Semenov NA, Pushkarevsky NA, Lonchakov AV, Bogomyakov AS, Pritchina EA, Suturina EA, Gritsan NP, Konchenko SN, Mews R, Ovcharenko VI, Zibarev AV. Heterospin π-Heterocyclic Radical-Anion Salt: Synthesis, Structure, and Magnetic Properties of Decamethylchromocenium [1,2,5]Thiadiazolo[3,4-c][1,2,5]thiadiazolidyl. Inorg Chem 2010; 49:7558-64. [DOI: 10.1021/ic101064c] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | | | | | - Artem S. Bogomyakov
- International Tomography Center, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
| | - Elena A. Pritchina
- Institute of Chemical Kinetics & Combustion
- Department of Natural Sciences, Novosibirsk State University, Novosibirsk, Russia
| | | | - Nina P. Gritsan
- Institute of Chemical Kinetics & Combustion
- Department of Physics
| | | | - Ruediger Mews
- Institute for Inorganic and Physical Chemistry, University of Bremen, Bremen, Germany
| | - Victor I. Ovcharenko
- International Tomography Center, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
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Fourmigué M, Cauchy T, Nomura M. Experimental and theoretical evaluation of magnetic coupling in organometallic radicals: the eloquent case of face-to-face Cp⋯Cp interactions. CrystEngComm 2009. [DOI: 10.1039/b823200h] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Belo D, Mendonça J, Santos IC, Pereira LCJ, Almeida M, Novoa JJ, Rovira C, Veciana J, Gama V. Metallocenium Salts of Nickel Bis(α-thiophenedithiolate) [M(Cp*)2][Ni(α-tpdt)2] (M = Fe, Mn, Cr) - Metamagnetism and Magnetic Frustration. Eur J Inorg Chem 2008. [DOI: 10.1002/ejic.200800621] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Rabaça S, Vieira BJC, Meira R, Santos IC, Pereira LCJ, Duarte MT, da Gama V. Magnetic Coupling and Anisotropy in a Series of Mixed Chain Charge-Transfer Salts [M(Cp*)2][M′(tds)2] (M = Fe, Mn, Cr; M′ = Ni, Pt). Eur J Inorg Chem 2008. [DOI: 10.1002/ejic.200800380] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Flood A, McAdam C, Gordon K, Kjaergaard H, Manning A, Robinson B, Simpson J. Electronic structure and near-IR transitions of FcC2R and FcC4R dyads. Polyhedron 2007. [DOI: 10.1016/j.poly.2006.07.002] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Turek P, Wautelet P, Moigne JL, Stanger JL, André JJ, Bieber A, Rey P, De Cian A, Fischer J. Intramolecular Long Range Electronic Spin Exchange Coupling in Diradicals: A New Magnetic Coupling Unit. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/10587259508055277] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Philippe Turek
- a Istitut Charles Sadron, Université Louis Pasteur , 67083 , Strasbourg Cedex , France
| | - Pascale Wautelet
- b Institut de Physique et Chimie des Matériaux de Strasbourg , 67037 , Strasbourg Cedex , France
| | - Jacques Le Moigne
- b Institut de Physique et Chimie des Matériaux de Strasbourg , 67037 , Strasbourg Cedex , France
| | - Jean-Louis Stanger
- a Istitut Charles Sadron, Université Louis Pasteur , 67083 , Strasbourg Cedex , France
| | - Jean-Jacques André
- a Istitut Charles Sadron, Université Louis Pasteur , 67083 , Strasbourg Cedex , France
| | - André Bieber
- a Istitut Charles Sadron, Université Louis Pasteur , 67083 , Strasbourg Cedex , France
| | - Paul Rey
- c Centre ďEtudes Nucléaires de Grenoble , DRFMC/SESAM, BP85X, 38041 , Grenoble Cedex , France
| | - André De Cian
- d Centre de Recherches Chimie, Université Louis Pasteur , 67070 , Strasbourg Cedex , France
| | - Jean Fischer
- d Centre de Recherches Chimie, Université Louis Pasteur , 67070 , Strasbourg Cedex , France
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Broderick WE, Liu X, Owens S, Toscano PM, Eichhorn DM, Hoffman BM. Ferromagnetism in a New Structural, Phase of [Fe(C5Me5)2] [TCNQ]. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/10587259508031836] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- William E. Broderick
- a Department of Chemistry , University at Albany, State University of New York , Albany , NY , 12222
| | - Xiaohua Liu
- a Department of Chemistry , University at Albany, State University of New York , Albany , NY , 12222
| | - Scott Owens
- a Department of Chemistry , University at Albany, State University of New York , Albany , NY , 12222
| | - Paul M. Toscano
- a Department of Chemistry , University at Albany, State University of New York , Albany , NY , 12222
| | - David M. Eichhorn
- b Department of Chemistry and Materials Research Center , Northwestern University , Evanston , IL , 602
| | - Brian M. Hoffman
- b Department of Chemistry and Materials Research Center , Northwestern University , Evanston , IL , 602
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Affiliation(s)
- Fernando Palacio
- a Instituto de Ciencia de Materiales de Aragon. C.S.I.C. - Universidad de Zaragoza , E-50009 , Zaragoza , Spain
| | - Jose Ramos
- a Instituto de Ciencia de Materiales de Aragon. C.S.I.C. - Universidad de Zaragoza , E-50009 , Zaragoza , Spain
| | - Cristina Castro
- a Instituto de Ciencia de Materiales de Aragon. C.S.I.C. - Universidad de Zaragoza , E-50009 , Zaragoza , Spain
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Rabaça S, Meira R, Pereira L, Teresa Duarte M, Novoa J, Gama V. Metamagnetism in linear chain electron-transfer salts based on decamethylferrocenium and metal–bis(dichalcogenate) acceptors. Inorganica Chim Acta 2001. [DOI: 10.1016/s0020-1693(01)00669-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Electronic structures of organometallic conjugated systems. Possibilities of molecular magnets, magnetic conductors and spin-mediated superconductors composed of metallocene units. J Organomet Chem 1998. [DOI: 10.1016/s0022-328x(98)00786-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Hilbig H, Hudeczek P, Köhler FH, Xie X, Bergerat P, Kahn O. Ferro- and Antiferromagnetic Exchange in Decamethylbimetallocenes. Inorg Chem 1998; 37:4246-4257. [PMID: 11670559 DOI: 10.1021/ic980332t] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
With the aim of studying next-neighbor magnetic interactions in polymeric metallocenes the paramagnetic decamethylbimetallocenes (M'M') have been chosen as most simple model compounds. They have been synthesized for vanadium, cobalt, and nickel (to yield V'V', Co'Co', and Ni'Ni', respectively) by starting from dilithium and dithallium salts of the fulvalene dianion. The latter have been characterized by (13)C NMR spectroscopy. Decamethylbiferrocene has been synthesized as a diamagnetic standard compound, and decamethylbicobaltocenium hexafluorophosphate, as a precursor to Co'Co'. While the methylated M'M' species were stable when protected from air, the synthesis of the parent binickelocene (Ni'Ni') was accompanied by the formation of the ternickelocene NiNiNi. According to (1)H NMR spectroscopy NiNi and NiNiNi were antiferromagnetic and underwent ligand exchange to nickelocene and bisfulvalenedinickel. Unlike the usually green nickelocenes Ni'Ni' was deep red-violet owing to a new band at 528 nm. Measurements of the magnetic susceptibility (chi(m)) and the magnetization established a rare example of ferromagnetic interaction within a purely organometallic compound for Co'Co'. By contrast, V'V' and Ni'Ni' were antiferromagnetic (J = -1.6 and -180 cm(-)(1), respectively, with H = -JS(A).S(B)). The (1)H and (13)C NMR spectra confirmed the expected structures of Co'Co' and Ni'Ni', while the synthesis of V'V'-d(8) and (2)H NMR spectroscopy were necessary to fully establish the vanadium compound. Temperature-dependent measurements of the (1)H NMR signal shifts and of chi(m) yielded similar J values for Ni'Ni'. MO calculations were carried out for M'M', and the results were converted into theoretical NMR spectra of the bridging fulvalene ligand depending on the spin-carrying MO. This allowed the full assignment of the NMR signals and showed that the spin is delocalized to more than one MO. The MOs were shown to have different magnetic coupling capabilities, and the different magnetic behavior of M'M' was attributed to the near-degeneracy of the magnetic orbitals.
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Affiliation(s)
- Harald Hilbig
- Anorganisch-chemisches Institut, Technische Universität München, D-85747 Garching, Germany, and Laboratoratoire des Sciences Moléculaires, Institut de Chimie de la Matière Condensée de Bordeaux, UPR CNRS 9048, Avenue du Dr. A. Schweitzer, F-33608 Pessac Cédex, France
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Yan YK, Mingos DMP, Müller TE, Williams DJ, Kurmoo M. Synthesis and characterisation of the mixed-sandwich complex closo-[3-(η-C5Me5)Fe-4-Me2S-1,2-C2B9H10] and its charge-transfer salts; crystal structure of [Fe(η-C5Me5)-(C2B9H10SMe2)]+[ddq]˙–·CH2Cl2(ddq = 2,3-dichloro-5,6-dicyano-p-benzoquinone). ACTA ACUST UNITED AC 1995. [DOI: 10.1039/dt9950002509] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Sugimoto T. Structural and Functional Aspects of Tetrathaiafulvalene Derivatives and Analogues. PHOSPHORUS SULFUR 1994. [DOI: 10.1080/10426509408034209] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Forward JM, Michael D, Mingos P, Müller TE, Williams DJ, Yan YK. Synthesis and structural characterization of metallacarborane sandwich salts with tetrathiafulvalene (ttf) [M(C2B9H11)2 ][ttf] (M = Cr, Fe, Ni). J Organomet Chem 1994. [DOI: 10.1016/0022-328x(94)80007-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Miller JS, Epstein AJ. Organische und metallorganische molekulare magnetische Materialien: Designer-Magnete. Angew Chem Int Ed Engl 1994. [DOI: 10.1002/ange.19941060405] [Citation(s) in RCA: 197] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Zhou P, Makivic M, Zuo F, Zane S, Miller JS, Epstein AJ. Ferromagnetic behavior and magnetic excitations in a molecular-based alternating-spin chain: Decamethylchromocenium tetracyanoethanide. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 49:4364-4367. [PMID: 10011347 DOI: 10.1103/physrevb.49.4364] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Miller JS, Mclean RS, Vazquez C, Calabrese JC, Zuo F, Epstein AJ. Decamethylchromocenium tetracyanoethenide, (Cr(C5Me5)2]:.+[TCNE]˙+: a molecular ferromagnet with Tc= 3.65 K. ACTA ACUST UNITED AC 1993. [DOI: 10.1039/jm9930300215] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Kollmar C, Kahn O. A Heisenberg Hamiltonian for intermolecular exchange interaction: Spin delocalization and spin polarization. J Chem Phys 1993. [DOI: 10.1063/1.464639] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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