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Xia CC, Zhang XY, Zhang CC, Li G, Wei HY, Wang XY. Syntheses and magnetic properties of a bis-bidentate nitronyl nitroxide radical based on triazolopyrimidine and its metal complexes. Dalton Trans 2023. [PMID: 37326416 DOI: 10.1039/d3dt01277h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
A novel bis-bidentate nitronyl nitroxide radical based on triazolopyrimidine, NIT-2-TrzPm (NIT-2-TrzPm = (2-(2'-triazolopyrimidine)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazol-1-oxy-3-oxide)) and six new transition metal complexes of this ligand, namely [M(hfac)2(NIT-2-TrzPm)]·CH2Cl2 (M = Mn (1Mn) and Co (2Co)), [M(hfac)2]2(NIT-2-TrzPm) (M = Mn (3Mn) and Co (4Co)), [Mn(NIT-2-TrzPm)2(MeOH)2](ClO4)2·MeOH (5Mn), and [Co(NIT-2-TrzPm)2(MeOH)2]2(ClO4)4·4MeOH (6Co) were prepared and characterized structurally and magnetically. These complexes can be selectively synthesized by controlling the reaction ratio of M(hfac)2·2H2O to the radical ligand (for 1Mn to 4Co) or using metal perchlorates as the starting materials (for 5Mn and 6Co). Single crystal X-ray crystallographic analyses confirmed that 1Mn and 2Co are isostructural 3d-2p MII-radical complexes, in which the NIT-2-TrzPm radical acts as a terminal bidentate ligand chelating to one 3d ion, while 3Mn and 4Co are isostructural 3d-2p-3d MII-radical-MII complexes with the NIT-2-TrzPm radical acting as a bridging ligand between two 3d ions. For complexes 5Mn and 6Co, two NIT-2-TrzPm ligands from the equatorial positions coordinate with the metal center to form the 2p-3d-2p structures with the axial positions occupied by two methanol molecules. Magnetic analysis on the MnII complexes revealed the existence of a strong antiferromagnetic interaction between the MnII and the NIT radical spin, while weak ferromagnetic coupling for Mn⋯Mn and Rad⋯Rad in the Mn-NIT-Mn and Rad-Mn-Rad spins was confirmed. Interestingly, although the NIT-bridged complexes 3Mn and 4Co possess significantly different magnetic anisotropy, field-induced slow magnetic relaxation can be observed in both complexes, which was assigned to the phonon bottleneck effect for 3Mn and field-induced SMM behavior for 4Co. To the best of our knowledge, 3Mn is the first example of the NIT-bridged binuclear MnII complex undergoing slow magnetic relaxation.
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Affiliation(s)
- Cheng-Cai Xia
- State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China.
| | - Xin-Yu Zhang
- State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China.
| | - Cheng-Cheng Zhang
- State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China.
| | - Gang Li
- State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China.
| | - Hai-Yan Wei
- Jiangsu Key Laboratory of Biofunctional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023, China.
| | - Xin-Yi Wang
- State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China.
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Zhang P, Luo QC, Zhu Z, He W, Song N, Lv J, Wang X, Zhai QG, Zheng YZ, Tang J. Radical-Bridged Heterometallic Single-Molecule Magnets Incorporating Four Lanthanoceniums. Angew Chem Int Ed Engl 2023; 62:e202218540. [PMID: 36710242 DOI: 10.1002/anie.202218540] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Revised: 01/25/2023] [Accepted: 01/26/2023] [Indexed: 01/31/2023]
Abstract
The syntheses and magnetic properties of organometallic heterometallic compounds [K(THF)6 ]{CoI [(μ3 -HAN)RE2 Cp*4 ]2 } (1-RE) and [K(Crypt)]2 {CoI [(μ3 -HAN)RE2 Cp*4 ]2 } (2-RE) containing hexaazatrinaphthylene radicals (HAN⋅3- ) and four rare earth (RE) ions are reported. 1-RE shows isolable species with ligand-based mixed valency as revealed by cyclic voltammetry (CV) thus leading to the isolation of 2-RE via one-electron chemical reduction. Strong electronic communication in mixed-valency supports stronger overall ferromagnetic behaviors in 2-RE than 1-RE containing Gd and Dy ions. Ac magnetic susceptibility data reveal 1-Dy and 2-Dy both exhibit slow magnetic relaxation. Importantly, larger coercive field was observed in the hysteresis of 2-Dy at 2.0 K, indicating the enhanced SMM behavior compared with 1-Dy. Ligand-based mixed-valency strategy has been used for the first time to improve the magnetic coupling in lanthanide (Ln) SMMs, thus opening up new ways to construct strongly coupled Ln-SMMs.
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Affiliation(s)
- Peng Zhang
- School of Chemistry & Chemical Engineering, Shaanxi Normal University, Xi'an, 710119, China
| | - Qian-Cheng Luo
- Frontier Institute of Science and Technology (FIST), Xi'an Jiaotong University Xi An Shi, Xi'an, 710054, China
| | - Zhenhua Zhu
- State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China
| | - Wanrong He
- School of Chemistry & Chemical Engineering, Shaanxi Normal University, Xi'an, 710119, China
| | - Nan Song
- School of Chemistry & Chemical Engineering, Shaanxi Normal University, Xi'an, 710119, China
| | - Junting Lv
- School of Chemistry & Chemical Engineering, Shaanxi Normal University, Xi'an, 710119, China
| | - Xuning Wang
- School of Chemistry & Chemical Engineering, Shaanxi Normal University, Xi'an, 710119, China
| | - Quan-Guo Zhai
- School of Chemistry & Chemical Engineering, Shaanxi Normal University, Xi'an, 710119, China
| | - Yan-Zhen Zheng
- Frontier Institute of Science and Technology (FIST), Xi'an Jiaotong University Xi An Shi, Xi'an, 710054, China
| | - Jinkui Tang
- State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China
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Xia CC, Ji WJ, Zhang XY, Miao H, Zhang YQ, Wang XY. Syntheses, structures, and magnetic properties of the lanthanide complexes of imidazole-substituted nitronyl nitroxide biradicals. Dalton Trans 2022; 51:12362-12372. [PMID: 35904351 DOI: 10.1039/d2dt01652d] [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
Two new bis-bidentate imidazole-substituted nitronyl nitroxide biradicals, BNITIm-C2 (BNITIm-C2 = 1,1'-(1,2-ethanediyl)bis(1H-imidazole-2-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazol-1-oxy-3-oxide)) and BNITIm-C4 (BNITIm-C4 = 1,1'-(1,4-butanediyl)bis(1H-imidazole-2-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazol-1-oxy-3-oxide)), and two series of lanthanide complexes, namely [(BNITIm-C2)Ln(NO3)3](MeOH) (Ln = Gd (1Gd) and Tb (2Tb)), (BNITIm-C2)Dy(NO3)3 (3Dy) and (BNITIm-C4)[Ln(hfac)3]2(C7H8)2 (Ln = Gd (4Gd), Tb (5Tb) and Dy (6Dy), hfac = hexafluoroacetylacetonate), have been prepared and characterized structurally and magnetically. Single crystal X-ray crystallographic analyses revealed that complexes 1Gd-3Dy exhibit 1D chain structures where the Ln(NO3)3 units are bridged by the BNITIm-C2 bis-bidentate biradical, while complexes 4Gd-6Dy exhibit binuclear structures with two Ln(hfac)3 units bridged by the BNITIm-C4 biradical. The bulky hfac anions prohibit the further coordination of LnIII to another NIT ligand and the formation of a similar 1D chain structure. Due to the very long intra- and intermolecular distances of the spin centers, complexes 1Gd-3Dy can be magnetically regarded as an isolated 2p-4f-2p tri-spin system while complex 4Gd-6Dy can be regarded as an isolated 2p-4f bi-spin system. Magnetic analyses on the two GdIII compounds revealed the ferromagnetic GdIII-NIT interactions and antiferromagnetic NIT-NIT interactions through the GdIII ion in 1Gd. Alternating-current (ac) magnetic susceptibility investigations revealed that complex 5Tb exhibits the typical SMM behavior under a zero dc field while complex 6Dy was proved to be a field-induced SMM. Ab initio calculations were performed on complexes 2Tb and 5Tb to understand their magnetic anisotropy together with their different magnetic dynamics.
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Affiliation(s)
- Cheng-Cai Xia
- State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China.
| | - Wen-Jie Ji
- State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China.
| | - Xin-Yu Zhang
- State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China.
| | - Hao Miao
- State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, School of Chemistry and Chemical Engineering, 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.
| | - Xin-Yi Wang
- State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China.
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Romanenko NR, Kuzmin AV, Mikhailenko MV, Faraonov MA, Khasanov SS, Yudanova EI, Shestakov AF, Otsuka A, Yamochi H, Kitagawa H, Konarev DV. Trinuclear coordination assemblies of low-spin dicyano manganese(II) ( S = 1/2) and iron(II) ( S = 0) phthalocyanines with manganese(II) acetylacetonate, tris(cyclopentadienyl)gadolinium(III) and neodymium(III). Dalton Trans 2022; 51:9770-9779. [PMID: 35704389 DOI: 10.1039/d2dt01052f] [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
The reaction of MnIIPc, FeIIPc or FeIIPcCl16 with KCN in the presence of cryptand[2.2.2] yielded dicyano-complexes {cryptand(K+)}2{MII(CN)2(macrocycle2-)}2-·XC6H4Cl2 (M = Mn and Fe, X = 1 and 2) that were used for the preparation of trinuclear assemblies of the general formula {cryptand(K+)}2{MII(CN)2Pc·(ML)2}2-·nC6H4Cl2 (MII = MnII and FeII; n = 1, 4 and 5). These assemblies were formed via coordination of two manganese(II) acetylacetonate (ML = MnII(acac)2, S = 5/2), tris(cyclopentadienyl)gadolinium (ML = Cp3GdIII, S = 7/2) or tris(cyclopentadienyl)neodymium (ML = Cp3NdIII, S = 3/2) units to the nitrogen atoms of bidentate cyano ligands. The N(CN)-Mn{MnII(acac)2} bond is 2.129(3) Å long but the bonds are elongated to 2.43-2.49 Å for tris(cyclopentadienyl)lanthanides. {Cryptand(K+)}2{MnII(CN)2Pc·(MnII(acac)2)2}2-·5C6H4Cl2 (2) contains three Mn(II) ions in different spin states (S = 5/2 and 1/2). Strong antiferromagnetic coupling of spins observed between them with the exchange interaction (J) of -17.6 cm-1 enables the formation of a high S = 9/2 spin state for {MnII(CN)2Pc·(MnII(acac)2)2}2- dianions at 2 K. The estimated exchange interaction between MnII (S = 1/2) and GdIII (S = 7/2) spins in {MnII(CN)2Pc·(Cp3GdIII)2}2- is only -1.1 cm-1, and in contrast to 2, nearly independent GdIII and MnII centers are formed. As a result, no transition to the high-spin state is observed in {MnII(CN)2Pc·(Cp3GdIII)2}2-. The {MnII(CN)2Pc·(Cp3NdIII)2}2- and{FeII(CN)2Pc·(Cp3NdIII)2}2- dianions with Cp3NdIII show a decrease of χMT values in the whole studied temperature range (300-1.9 K). A similar behaviour was found previously for pristine Cp3NdIII and Cp3NdIII·L complexes (L = alkylisocyanide ligand).
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Affiliation(s)
- Nikita R Romanenko
- Institute of Problems of Chemical Physics, RAS, Chernogolovka, Moscow region, 142432 Russia.
| | - Alexey V Kuzmin
- Institute of Solid State Physics, RAS, Chernogolovka, Moscow region, 142432 Russia
| | - Maxim V Mikhailenko
- Institute of Problems of Chemical Physics, RAS, Chernogolovka, Moscow region, 142432 Russia.
| | - Maxim A Faraonov
- Institute of Problems of Chemical Physics, RAS, Chernogolovka, Moscow region, 142432 Russia.
| | - Salavat S Khasanov
- Division of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Evgeniya I Yudanova
- Institute of Problems of Chemical Physics, RAS, Chernogolovka, Moscow region, 142432 Russia.
| | - Alexander F Shestakov
- Institute of Problems of Chemical Physics, RAS, Chernogolovka, Moscow region, 142432 Russia.
| | - Akihiro Otsuka
- Division of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan.,Research Center for Low Temperature and Materials Sciences, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - Hideki Yamochi
- Division of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan.,Research Center for Low Temperature and Materials Sciences, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - Hiroshi Kitagawa
- Division of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Dmitri V Konarev
- Institute of Problems of Chemical Physics, RAS, Chernogolovka, Moscow region, 142432 Russia.
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Kapurwan S, Gupta A, Mondal A, Konar S. Halo‐Substituted Blatter Radicals and Their Role in Modulating Magnetic Interaction in Metal Complexes: A Combined Experimental and Theoretical Study. ChemistrySelect 2022. [DOI: 10.1002/slct.202104536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Sandhya Kapurwan
- Department of Chemistry Indian Institute of Science Education and Research Bhopal Bhopal By-pass Road, Bhauri Madhya Pradesh India- 462066
| | - Arindam Gupta
- Department of Chemistry Indian Institute of Science Education and Research Bhopal Bhopal By-pass Road, Bhauri Madhya Pradesh India- 462066
| | - Arpan Mondal
- Department of Chemistry Indian Institute of Science Education and Research Bhopal Bhopal By-pass Road, Bhauri Madhya Pradesh India- 462066
| | - Sanjit Konar
- Department of Chemistry Indian Institute of Science Education and Research Bhopal Bhopal By-pass Road, Bhauri Madhya Pradesh India- 462066
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6
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Mikhailenko MV, Khasanov SS, Shestakov AF, Kuzmin AV, Otsuka A, Yamochi H, Kitagawa H, Konarev DV. Weak Antiferromagnetic Exchange and Ferromagnetic Alignment of Fe II (S=2) Spins in Differently Charged {HAT ⋅ (Fe II Cl 2 ) 3 } n (n=2- and 3-) Assemblies of Hexaazatriphenylenes (HAT). Chemistry 2022; 28:e202104165. [PMID: 34981590 DOI: 10.1002/chem.202104165] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2021] [Indexed: 01/07/2023]
Abstract
Hexaazatrianthracene (HATA) and hexaazatriphenylenehexacarbonitrile {HAT(CN)6 } are reduced by metallic iron in the presence of crystal violet (CV+ )(Cl- ). Anionic ligands are produced, which simultaneously coordinate three FeII Cl2 to form (CV+ )2 {HATA ⋅ (FeII Cl2 )3 }2- ⋅ 3 C6 H4 Cl2 (1) and (CV+ )3 {HAT(CN)6. (FeII Cl2 )3 }3- ⋅ 0.5CVCl ⋅ 2.5 C6 H4 Cl2 (2). High-spin (S=2) FeII atoms in both structures are arranged in equilateral triangles at a distance of 7 Å. An antiferromagnetic exchange is observed between FeII in {HATA ⋅ (FeII Cl2 )3 }2- (1) with a Weiss temperature (Θ) of -80 K, the PHI estimated exchange interaction (J) is -4.7 cm-1 . The {HAT(CN)6 ⋅ (FeII Cl2 )3 }3- assembly is obtained in 2. The formation of HAT(CN)6 .3- is supported by the appearance of an intense EPR signal with g=2.0037. The magnetic behavior of 2 is described by a strong antiferromagnetic coupling between the FeII and HAT(CN)6 .3- spins with J1 =-164 cm-1 (-2 J formalism) and by a weaker antiferromagnetic coupling between the FeII spins with J2 =-15.4 cm-1 . The stronger coupling results in the spins of the three FeII Cl2 units to be aligned parallel to each other in the assembly. As a result, an increase of the χM T values is observed with the decrease of temperature from 9.82 at 300 K up to 15.06 emu ⋅ K/mol at 6 K, and the Weiss temperature is also positive being at +23 K. Thus, a change in the charge and spin state of the HAT-type ligand to ⋅3- results in ferromagnetic alignment of the FeII spins, yielding a high-spin (S=11/2) system. DFT calculations showed that, due to the high symmetry and nearly degenerated LUMO of both HATA and HAT(CN)6 , their complexes with FeII Cl2 have a variety of closely lying excited high-spin states with multiplicity up to S=15/2.
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Affiliation(s)
- Maxim V Mikhailenko
- Institute of Problems of Chemical Physics RAS, Chernogolovka, 142432, Russian Federation
| | - Salavat S Khasanov
- Institute of Solid State Physics RAS, Chernogolovka, 142432, Russian Federation
| | - Alexader F Shestakov
- Institute of Problems of Chemical Physics RAS, Chernogolovka, 142432, Russian Federation
| | - Aleksey V Kuzmin
- Institute of Solid State Physics RAS, Chernogolovka, 142432, Russian Federation
| | - Akihiro Otsuka
- Division of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan.,Research Center for Low Temperature and Materials Sciences, Kyoto University, Sakyo-ku, Kyoto, 606-8501, Japan
| | - Hideki Yamochi
- Division of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan.,Research Center for Low Temperature and Materials Sciences, Kyoto University, Sakyo-ku, Kyoto, 606-8501, Japan
| | - Hiroshi Kitagawa
- Division of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Dmitri V Konarev
- Institute of Problems of Chemical Physics RAS, Chernogolovka, 142432, Russian Federation
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Benner F, Demir S. Isolation of the elusive bisbenzimidazole Bbim 3−˙ radical anion and its employment in a metal complex. Chem Sci 2022; 13:5818-5829. [PMID: 35685798 PMCID: PMC9132035 DOI: 10.1039/d1sc07245e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Accepted: 04/05/2022] [Indexed: 11/28/2022] Open
Abstract
The discovery of singular organic radical ligands is a formidable challenge due to high reactivity arising from the unpaired electron. Matching radical ligands with metal ions to engender magnetic coupling is crucial for eliciting preeminent physical properties such as conductivity and magnetism that are crucial for future technologies. The metal-radical approach is especially important for the lanthanide ions exhibiting deeply buried 4f-orbitals. The radicals must possess a high spin density on the donor atoms to promote strong coupling. Combining diamagnetic 89Y (I = 1/2) with organic radicals allows for invaluable insight into the electronic structure and spin-density distribution. This approach is hitherto underutilized, possibly owing to the challenging synthesis and purification of such molecules. Herein, evidence of an unprecedented bisbenzimidazole radical anion (Bbim3−˙) along with its metalation in the form of an yttrium complex, [K(crypt-222)][(Cp*2Y)2(μ-Bbim˙)] is provided. Access of Bbim3−˙ was feasible through double-coordination to the Lewis acidic metal ion and subsequent one-electron reduction, which is remarkable as Bbim2− was explicitly stated to be redox-inactive in closed-shell complexes. Two molecules containing Bbim2− (1) and Bbim3−˙ (2), respectively, were thoroughly investigated by X-ray crystallography, NMR and UV/Vis spectroscopy. Electrochemical studies unfolded a quasi-reversible feature and emphasize the role of the metal centre for the Bbim redox-activity as neither the free ligand nor the Bbim2− complex led to analogous CV results. Excitingly, a strong delocalization of the electron density through the Bbim3−˙ ligand was revealed via temperature-dependent EPR spectroscopy and confirmed through DFT calculations and magnetometry, rendering Bbim3−˙ an ideal candidate for single-molecule magnet design. The long sought-after bisbenzimidazole radical was isolated through complexation to two rare earth metallocenes followed by reduction, and analysed through crystallography, VT EPR spectroscopy, electrochemistry, magnetometry, and DFT computations.![]()
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Affiliation(s)
- Florian Benner
- Department of Chemistry, Michigan State University, 578 South Shaw Lane, East Lansing, Michigan 48824, USA
| | - Selvan Demir
- Department of Chemistry, Michigan State University, 578 South Shaw Lane, East Lansing, Michigan 48824, USA
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8
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Yang L, Dincă M. Redox Ladder of Ni
3
Complexes with Closed‐Shell, Mono‐, and Diradical Triphenylene Units: Molecular Models for Conductive 2D MOFs. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202109304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Luming Yang
- Department of Chemistry Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge MA 02139 USA
| | - Mircea Dincă
- Department of Chemistry Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge MA 02139 USA
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Yang L, Dincă M. Redox Ladder of Ni 3 Complexes with Closed-Shell, Mono-, and Diradical Triphenylene Units: Molecular Models for Conductive 2D MOFs. Angew Chem Int Ed Engl 2021; 60:23784-23789. [PMID: 34472695 DOI: 10.1002/anie.202109304] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Revised: 08/16/2021] [Indexed: 01/07/2023]
Abstract
We report the isolation and characterization of a series of trinickel complexes with 2,3,6,7,10,11-hexaoxytriphenylene (HOTP), [(Me3 TPANi)3 (HOTP)](BF4 )n (Me3 TPA=N,N,N-tris[(6-methyl-2-pyridyl)methyl]amine) (n=2, 3, 4 for complexes 1, 2, 3). These complexes comprise a redox ladder whereby the HOTP core displays increasingly quinoidal character as its formal oxidation state changes from -4, to -3, and -2 in 1, 2, and 3, respectively. No formal oxidation state changes occur on Ni, allowing the isolation of singlet diradical, monoradical, and closed-shell configurations for HOTP in 1, 2, and 3, respectively, with a concomitant decrease in the spin coupling strength upon oxidation. Because the three complexes can be considered models of the smallest building blocks of 2D conductive metal-organic frameworks such as Ni9 HOTP4 , these results serve as possible inspiration for the construction of extended materials with targeted electric and magnetic properties.
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Affiliation(s)
- Luming Yang
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
| | - Mircea Dincă
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
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Konarev DV, Khasanov SS, Kuzmin AV, Mikhailenko MV, Otsuka A, Yamochi H, Kitagawa H, Lyubovskaya RN. Solid-State Properties of Hexaazatriphenylenehexacarbonitrile HAT(CN) 6 .- Radical Anions in Crystalline Salts Containing Cryptand(M + ) and Crystal Violet Cations. Chemistry 2020; 26:17470-17480. [PMID: 32852068 DOI: 10.1002/chem.202002967] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2020] [Revised: 07/31/2020] [Indexed: 01/07/2023]
Abstract
Crystalline {Cryptand[2.2.2](Na+ )}{HAT(CN)6 .- }⋅0.5C6 H4 Cl2 (1), {Cryptand[2.2.2](K+ )}{HAT(CN)6 .- } (2), (CV+ ){HAT(CN)6 .- } (3), and (CV+ ){HAT(CN)6 .- }⋅2C6 H4 Cl2 (4) salts (where CV+ is the crystal violet cation) containing hexaazatriphenylenehexacarbonitrile radical anions have been obtained. The solid-state molecular structure as well as the optical and magnetic properties of HAT(CN)6 .- are studied. The formation of HAT(CN)6 .- in 1-4 leads to the appearance of new bands in the visible range, at 694 and 740 nm. The HAT(CN)6 .- radical anions have spin state S=1/2 and are packed in one-dimensional stacks containing the {HAT(CN)6 .- }2 dimers alternated with weaker interacting pairs of HAT(CN)6 .- in 1 and nearly isolated {HAT(CN)6 .- }2 dimers in 2. The {HAT(CN)6 .- }2 dimers are diamagnetic in 1 but they effectively mediate one-dimensional antiferromagnetic coupling of spins within the stacks with moderate exchange interaction of J/kB = -80 K. The behaviour of salt 2 is described by a singlet-triplet model for the {HAT(CN)6 .- }2 dimers with an energy gap of 434(±7) K. Magnetic behaviour of both salts agree well with the data of extended Hückel calculations. Salts 3 and 4 contain isolated stacks of alternated HAT(CN)6 .- and CV+ ions, and in this case, nearly paramagnetic behaviour is observed with Weiss temperatures of -1 and -7 K, respectively. Narrow Lorentzian EPR signals with g = 2.0033-2.0039 were found for the HAT(CN)6 .- radical anions in 1 and 4 but in solution g-factor shifts to 1.9964. The electronic structure of HAT(CN)6 .- is analysed based on X-ray diffraction data for 2, showing a Jahn-Teller distortion of the radical anion that reduces the symmetry from D3h to Cs and splits the initially degenerated LUMOs.
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Affiliation(s)
- Dmitri V Konarev
- Department of Kinetics and Catalysis, Institute of Problems of, Chemical Physics RAS, 142432, Chernogolovka, Russian Federation
| | - Salavat S Khasanov
- Institute of Solid State Physics RAS, 142432, Chernogolovka, Russian Federation
| | - Alexey V Kuzmin
- Institute of Solid State Physics RAS, 142432, Chernogolovka, Russian Federation
| | - Maxim V Mikhailenko
- Department of Kinetics and Catalysis, Institute of Problems of, Chemical Physics RAS, 142432, Chernogolovka, Russian Federation.,Moscow State University, Leninskie Gory, 119991, Moscow, Russia
| | - Akihiro Otsuka
- Division of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan.,Research Center for Low Temperature and Materials Sciences, Kyoto University, Sakyo-ku, Kyoto, 606-8501, Japan
| | - Hideki Yamochi
- Division of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan.,Research Center for Low Temperature and Materials Sciences, Kyoto University, Sakyo-ku, Kyoto, 606-8501, Japan
| | - Hiroshi Kitagawa
- Division of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Rimma N Lyubovskaya
- Department of Kinetics and Catalysis, Institute of Problems of, Chemical Physics RAS, 142432, Chernogolovka, Russian Federation
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11
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Konarev DV, Khasanov SS, Mikhailenko MV, Batov MS, Shestakov AF, Kuzmin AV, Otsuka A, Yamochi H, Kitagawa H, Lyubovskaya RN. Magnetic Exchange through the Dianionic Hexaazatrinaphthylene (HATNA) Ligand in {HATNA(Fe
II
Cl
2
)
3
}
2−
Containing Fe
II
(
S
=2) Triangles. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000946] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Dmitri V. Konarev
- Institute of Problems of Chemical Physics RAS Chernogolovka, Moscow region 142432 Russia
| | - Salavat S. Khasanov
- Institute of Solid State Physics RAS Chernogolovka, Moscow region 142432 Russia
| | - Maxim V. Mikhailenko
- Institute of Problems of Chemical Physics RAS Chernogolovka, Moscow region 142432 Russia
- Moscow State University Leninskie Gory Moscow 119991 Russia
| | - Mikhail S. Batov
- Institute of Problems of Chemical Physics RAS Chernogolovka, Moscow region 142432 Russia
- Moscow State University Leninskie Gory Moscow 119991 Russia
| | - Alexander F. Shestakov
- Institute of Problems of Chemical Physics RAS Chernogolovka, Moscow region 142432 Russia
| | - Alexey V. Kuzmin
- Institute of Solid State Physics RAS Chernogolovka, Moscow region 142432 Russia
| | - Akihiro Otsuka
- Division of Chemistry Graduate School of Science Kyoto University, Sakyo-ku Kyoto 606-8502 Japan
- Research Center for Low Temperature and Materials Sciences Kyoto University, Sakyo-ku Kyoto 606-8501 Japan
| | - Hideki Yamochi
- Division of Chemistry Graduate School of Science Kyoto University, Sakyo-ku Kyoto 606-8502 Japan
- Research Center for Low Temperature and Materials Sciences Kyoto University, Sakyo-ku Kyoto 606-8501 Japan
| | - Hiroshi Kitagawa
- Division of Chemistry Graduate School of Science Kyoto University, Sakyo-ku Kyoto 606-8502 Japan
| | - Rimma N. Lyubovskaya
- Institute of Problems of Chemical Physics RAS Chernogolovka, Moscow region 142432 Russia
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12
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Markovic A, Gerhards L, Sander P, Dosche C, Klüner T, Beckhaus R, Wittstock G. Electronic Transitions in Different Redox States of Trinuclear 5,6,11,12,17,18-Hexaazatrinaphthylene-Bridged Titanium Complexes: Spectroelectrochemistry and Quantum Chemistry. Chemphyschem 2020; 21:2506-2514. [PMID: 32969136 PMCID: PMC7756296 DOI: 10.1002/cphc.202000547] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Revised: 09/22/2020] [Indexed: 11/14/2022]
Abstract
Multinuclear transition metal complexes bridged by ligands with extended π-electronic systems show a variety of complex electronic transitions and electron transfer reactions. While a systematic understanding of the photochemistry and electrochemistry has been attained for binuclear complexes, much less is known about trinuclear complexes such as hexaphenyl-5,6,11,12,17,18-hexaazatrinaphthylene-tristitanocene [(Cp2 Ti)3 HATN(Ph)6 ]. The voltammogram of [(Cp2 Ti)3 HATN(Ph)6 ] shows six oxidation and three reduction waves. Solution spectra of [(Cp2 Ti)3 HATN(Ph)6 ] and of the electrochemically formed oxidation products show electronic transitions in the UV, visible and the NIR ranges. Density functional theory (DFT) and linear response time-dependent DFT show that the three formally titanium(II) centers transfer an electron to the HATN ligand in the ground state. The optically excited transitions occur exclusively between ligand-centered orbitals. The charged titanium centers only provide an electrostatic frame to the extended π-electronic system. Complete active self-consistent field (CASSCF) calculation on a structurally simplified model compound, which considers the multi-reference character imposed by the three titanium centers, can provide an interpretation of the experimentally observed temperature-dependent magnetic behavior of the different redox states of the title compound in full consistency with the interpretation of the electronic spectra.
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Affiliation(s)
- Aleksandra Markovic
- School of Mathematics and ScienceChemistry DepartmentCarl von Ossietzky University of Oldenburg26111OldenburgGermany
| | - Luca Gerhards
- School of Mathematics and ScienceChemistry DepartmentCarl von Ossietzky University of Oldenburg26111OldenburgGermany
| | - Pia Sander
- School of Mathematics and ScienceChemistry DepartmentCarl von Ossietzky University of Oldenburg26111OldenburgGermany
| | - Carsten Dosche
- School of Mathematics and ScienceChemistry DepartmentCarl von Ossietzky University of Oldenburg26111OldenburgGermany
| | - Thorsten Klüner
- School of Mathematics and ScienceChemistry DepartmentCarl von Ossietzky University of Oldenburg26111OldenburgGermany
| | - Rüdiger Beckhaus
- School of Mathematics and ScienceChemistry DepartmentCarl von Ossietzky University of Oldenburg26111OldenburgGermany
| | - Gunther Wittstock
- School of Mathematics and ScienceChemistry DepartmentCarl von Ossietzky University of Oldenburg26111OldenburgGermany
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13
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Structure changes from radical-3d ring dimer to radical-3d-4f 1D chain with different magnetic properties. Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2020.119867] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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14
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Xi L, Li H, Sun J, Ma Y, Tang J, Li L. Designing Multicoordinating Nitronyl Nitroxide Radical Toward Multinuclear Lanthanide Aggregates. Inorg Chem 2020; 59:443-451. [PMID: 31846321 DOI: 10.1021/acs.inorgchem.9b02739] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Profiting from a multicoordinating nitronyl nitroxide radical, i.e. a functionalized nitronyl nitroxide biradical ligand, a family of novel tetranuclear lanthanide complexes, formulated as [RE4(hfac)12(NITPhO-3Pybis)2] (RE = Gd 1, Tb 2, Dy 3, Ho 4, and Y 5; NITPhO-3Pybis = 5-(3-pyridinyloxy)-1,3-bis(1'-oxyl-3'-oxido-4',4',5',5'-tetramethyl-4,5-hydro-1H-imidazol-2-yl)benzene; hfac = hexafluoroacetylacetonate) were successfully constructed and characterized. In these complexes, the designed functionalized nitronyl nitroxide biradical ligand functions as the chelating and/or bridging ligand to bind the lanthanide ions, resulting in tetranuclear octa-spin lanthanide complexes with a circle-shaped arrangement. Direct-current magnetic data show that antiferromagnetic interaction dominates in the Gd derivative, while ferromagnetic coupling plays a leading role in complex Y, in which the relevant magnetic exchange parameters were obtained through applicable magnetic models. Dynamic magnetic studies of Tb and Dy analogues exhibit apparent frequency-dependent out-of-phase signals, which are typical features for slow magnetic relaxation behavior. The values of Ueff and τ0 were obtained as follows: Ueff = 10.5 K and τ0 = 6.6 × 10-7 s for the Tb complex and Ueff = 5.2 K and τ0 = 2.5 × 10-6 s for the Dy compound. Intriguingly, the butterfly shaped hysteresis loop is found for the Tb analogue. Guided by fluorescence spectra, the representative peaks are identified for the Tb derivative.
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Affiliation(s)
- Lu Xi
- Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry, College of Chemistry , Nankai University , Tianjin 300071 , China
| | - Hongdao Li
- Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry, College of Chemistry , Nankai University , Tianjin 300071 , China
| | - Juan Sun
- Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry, College of Chemistry , Nankai University , Tianjin 300071 , China
| | - Yue Ma
- Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry, College of Chemistry , Nankai University , Tianjin 300071 , China
| | - Jinkui Tang
- State Key Laboratory of Rare Earth Resource Utilization , Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun 130022 , China
| | - Licun Li
- Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry, College of Chemistry , Nankai University , Tianjin 300071 , China
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15
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Xi L, Sun J, Wang K, Lu J, Jing P, Li L. Slow magnetic relaxation in CoII–LnIII heterodinuclear complexes achieved through a functionalized nitronyl nitroxide biradical. Dalton Trans 2020; 49:1089-1096. [DOI: 10.1039/c9dt04036f] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Five nitronyl nitroxide biradical-CoII–LnIII heterodinuclear complexes were achieved and the DyCo derivative displayed visible temperature/frequency-dependent χ′′ peaks, indicating the SMM behavior.
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Affiliation(s)
- Lu Xi
- Department of Chemistry
- Key Laboratory of Advanced Energy Materials Chemistry
- College of Chemistry
- Nankai University
- Tianjin 300071
| | - Juan Sun
- Department of Chemistry
- Key Laboratory of Advanced Energy Materials Chemistry
- College of Chemistry
- Nankai University
- Tianjin 300071
| | - Kang Wang
- Department of Chemistry
- Key Laboratory of Advanced Energy Materials Chemistry
- College of Chemistry
- Nankai University
- Tianjin 300071
| | - Jiao Lu
- Department of Chemistry
- Key Laboratory of Advanced Energy Materials Chemistry
- College of Chemistry
- Nankai University
- Tianjin 300071
| | - Pei Jing
- Department of Chemistry
- Key Laboratory of Advanced Energy Materials Chemistry
- College of Chemistry
- Nankai University
- Tianjin 300071
| | - Licun Li
- Department of Chemistry
- Key Laboratory of Advanced Energy Materials Chemistry
- College of Chemistry
- Nankai University
- Tianjin 300071
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16
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Shimizu D, Ide Y, Ikeue T, Osuka A. Coordination‐Induced Spin‐State Switching of an Aminyl‐Radical‐Bridged Nickel(II) Porphyrin Dimer between Doublet and Sextet States. Angew Chem Int Ed Engl 2019; 58:5023-5027. [PMID: 30761702 DOI: 10.1002/anie.201900792] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2019] [Indexed: 12/18/2022]
Affiliation(s)
- Daiki Shimizu
- Department of ChemistryGraduate School of ScienceKyoto University, Sakyo-ku Kyoto 606-8502 Japan
| | - Yuki Ide
- Interdisciplinary Graduate School of Science and EngineeringShimane University, Nishikawatsu-Cho Matsue 690-8504 Japan
| | - Takahisa Ikeue
- Interdisciplinary Graduate School of Science and EngineeringShimane University, Nishikawatsu-Cho Matsue 690-8504 Japan
| | - Atsuhiro Osuka
- Department of ChemistryGraduate School of ScienceKyoto University, Sakyo-ku Kyoto 606-8502 Japan
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17
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Shimizu D, Ide Y, Ikeue T, Osuka A. Coordination‐Induced Spin‐State Switching of an Aminyl‐Radical‐Bridged Nickel(II) Porphyrin Dimer between Doublet and Sextet States. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201900792] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Daiki Shimizu
- Department of ChemistryGraduate School of ScienceKyoto University, Sakyo-ku Kyoto 606-8502 Japan
| | - Yuki Ide
- Interdisciplinary Graduate School of Science and EngineeringShimane University, Nishikawatsu-Cho Matsue 690-8504 Japan
| | - Takahisa Ikeue
- Interdisciplinary Graduate School of Science and EngineeringShimane University, Nishikawatsu-Cho Matsue 690-8504 Japan
| | - Atsuhiro Osuka
- Department of ChemistryGraduate School of ScienceKyoto University, Sakyo-ku Kyoto 606-8502 Japan
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18
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Ma X, Suturina EA, De S, Négrier P, Rouzières M, Clérac R, Dechambenoit P. A Redox-Active Bridging Ligand to Promote Spin Delocalization, High-Spin Complexes, and Magnetic Multi-Switchability. Angew Chem Int Ed Engl 2018; 57:7841-7845. [PMID: 29714814 DOI: 10.1002/anie.201803842] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2018] [Indexed: 11/08/2022]
Abstract
A dinuclear CoII complex, [Co2 (tphz)(tpy)2 ]n+ (n=4, 3 or 2; tphz: tetrapyridophenazine; tpy: terpyridine), has been assembled using the redox-active and strongly complexing tphz bridging ligand. The magnetic properties of this complex can be tuned from spin-crossover with T1/2 ≈470 K for the pristine compound (n=4) to single-molecule magnet with an ST =5/2 spin ground state when once reduced (n=3) to finally a diamagnetic species when twice reduced (n=2). The two successive and reversible reductions are concomitant with an increase of the spin delocalization within the complex, promoting remarkably large magnetic exchange couplings and high-spin species even at room temperature.
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Affiliation(s)
- Xiaozhou Ma
- CNRS, CRPP, UMR 5031, 33600, Pessac, France.,Univ. Bordeaux, CRPP, UMR 5031, 33600, Pessac, France
| | - Elizaveta A Suturina
- School of Chemistry, University of Southampton, Highfield Campus, Southampton, SO17 1BJ, UK
| | - Siddhartha De
- CNRS, CRPP, UMR 5031, 33600, Pessac, France.,Univ. Bordeaux, CRPP, UMR 5031, 33600, Pessac, France
| | - Philippe Négrier
- CNRS, LOMA, UMR 5798, 33400, Talence, France.,Univ. Bordeaux, LOMA, UMR 5798, 33400, Talence, France
| | - Mathieu Rouzières
- CNRS, CRPP, UMR 5031, 33600, Pessac, France.,Univ. Bordeaux, CRPP, UMR 5031, 33600, Pessac, France
| | - Rodolphe Clérac
- CNRS, CRPP, UMR 5031, 33600, Pessac, France.,Univ. Bordeaux, CRPP, UMR 5031, 33600, Pessac, France
| | - Pierre Dechambenoit
- CNRS, CRPP, UMR 5031, 33600, Pessac, France.,Univ. Bordeaux, CRPP, UMR 5031, 33600, Pessac, France
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19
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Ma X, Suturina EA, De S, Négrier P, Rouzières M, Clérac R, Dechambenoit P. A Redox-Active Bridging Ligand to Promote Spin Delocalization, High-Spin Complexes, and Magnetic Multi-Switchability. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201803842] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Xiaozhou Ma
- CNRS; CRPP, UMR 5031; 33600 Pessac France
- Univ. Bordeaux; CRPP, UMR 5031; 33600 Pessac France
| | - Elizaveta A. Suturina
- School of Chemistry; University of Southampton; Highfield Campus Southampton SO17 1BJ UK
| | - Siddhartha De
- CNRS; CRPP, UMR 5031; 33600 Pessac France
- Univ. Bordeaux; CRPP, UMR 5031; 33600 Pessac France
| | - Philippe Négrier
- CNRS; LOMA, UMR 5798; 33400 Talence France
- Univ. Bordeaux; LOMA, UMR 5798; 33400 Talence France
| | - Mathieu Rouzières
- CNRS; CRPP, UMR 5031; 33600 Pessac France
- Univ. Bordeaux; CRPP, UMR 5031; 33600 Pessac France
| | - Rodolphe Clérac
- CNRS; CRPP, UMR 5031; 33600 Pessac France
- Univ. Bordeaux; CRPP, UMR 5031; 33600 Pessac France
| | - Pierre Dechambenoit
- CNRS; CRPP, UMR 5031; 33600 Pessac France
- Univ. Bordeaux; CRPP, UMR 5031; 33600 Pessac France
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20
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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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21
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Gould CA, Darago LE, Gonzalez MI, Demir S, Long JR. A Trinuclear Radical‐Bridged Lanthanide Single‐Molecule Magnet. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201612271] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Colin A. Gould
- Department of Chemistry University of California, Berkeley Berkeley CA 94720 USA
| | - Lucy E. Darago
- Department of Chemistry University of California, Berkeley Berkeley CA 94720 USA
| | - Miguel I. Gonzalez
- Department of Chemistry University of California, Berkeley Berkeley CA 94720 USA
| | - Selvan Demir
- Institut für Anorganische Chemie Georg-August-Universität Göttingen Tammannstrasse 4 37077 Göttingen Germany
| | - Jeffrey R. Long
- Department of Chemistry University of California, Berkeley Berkeley CA 94720 USA
- Department of Chemical and Biomolecular Engineering University of California, Berkeley and Materials Sciences Division, Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
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22
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Gould CA, Darago LE, Gonzalez MI, Demir S, Long JR. A Trinuclear Radical‐Bridged Lanthanide Single‐Molecule Magnet. Angew Chem Int Ed Engl 2017; 56:10103-10107. [DOI: 10.1002/anie.201612271] [Citation(s) in RCA: 96] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2016] [Revised: 01/15/2017] [Indexed: 01/07/2023]
Affiliation(s)
- Colin A. Gould
- Department of Chemistry University of California, Berkeley Berkeley CA 94720 USA
| | - Lucy E. Darago
- Department of Chemistry University of California, Berkeley Berkeley CA 94720 USA
| | - Miguel I. Gonzalez
- Department of Chemistry University of California, Berkeley Berkeley CA 94720 USA
| | - Selvan Demir
- Institut für Anorganische Chemie Georg-August-Universität Göttingen Tammannstrasse 4 37077 Göttingen Germany
| | - Jeffrey R. Long
- Department of Chemistry University of California, Berkeley Berkeley CA 94720 USA
- Department of Chemical and Biomolecular Engineering University of California, Berkeley and Materials Sciences Division, Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
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