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Landart A, Quesada-Moreno MM, Palacios MA, Li Y, Ozerov M, Krzystek J, Colacio E. Control of the geometry and anisotropy driven by the combination of steric and anion coordination effects in Co II complexes with N 6-tripodal ligands: the impact of the size of the ligand on the magnetization relaxation time. Dalton Trans 2024; 53:12876-12892. [PMID: 38716508 DOI: 10.1039/d4dt00622d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/07/2024]
Abstract
Four mononuclear CoII complexes of formula [Co(L)(SCN)2(CH3OH)0.5(H2O)0.5]·1.5H2O·0.75CH3OH (1), [Co(L1)Cl2]·H2O·2CH3CN (2), [Co(L1)(SCN)2]·1.5H2O·CH3OH (3) and [Co(L1)]ClO4·2CH3OH (4) were prepared from the N6-tripodal Schiff base ligands (S)P[N(Me)NC(H)2-Q]3 (L) and (S)P[N(Me)NC(H)1-ISOQ]3 (L1), where Q and ISOQ represent quinolyl and isoquinolyl moieties, respectively. In 1, the L ligand does not coordinate to the CoII ion in a tripodal manner but using a new N,N,S tridentate mode, which is due to the fact that the N6-tripodal coordination promotes a strong steric hindrance between the quinolyl moieties. However, L1 can coordinate to the CoII ions either in a tripodal manner using CoII salts with poorly coordinating anions to give 4 or in a bisbidentate fashion using CoII salt-containing medium to strongly coordinating anions to afford 2 and 3. In the case of L1, there is no steric hindrance between ISOQ moieties after coordination to the CoII ion. The CoII ion exhibits a distorted octahedral geometry for compounds 1-3, with the anions in cis positions for the former and in trans positions for the two latter compounds. Compound 4 shows an intermediate geometry between an octahedral and trigonal prism but closer to the latter one. DC magnetic properties, HFEPR and FIRMS measurements and ab initio calculations demonstrate that distorted octahedral complexes 1-3 exhibit easy-plane magnetic anisotropy (D > 0), whereas compound 4 shows large easy-axis magnetic anisotropy (D < 0). Comparative analysis of the magneto-structural data underlines the important role that is played not only by the coordination geometry but also the electronic effects in determining the anisotropy of the CoII ions. Compounds 2-3 show a field-induced slow relaxation of magnetization. Despite its large easy-axis magnetic anisotropy, compound 4 does not show significant slow relaxation (SMR) above 2 K under zero applied magnetic fields, but its magnetic dilution with ZnII triggers SMR at zero field. Finally, it is worth remarking that compounds 2-4 show smaller relaxation times than the analogous complexes with the tripodal ligand bearing in its arms pyridine instead of isoquinoline moieties, which is most likely due to the increase of the molecular size in the former one.
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Affiliation(s)
- Aritz Landart
- Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Granada, 18071 Granada, Spain.
| | - María Mar Quesada-Moreno
- Departamento de Química Física y Analítica, Facultad de Ciencias Experimentales, Universidad de Jaén, Campus Las Lagunillas, 23071 Jaén, Spain
| | - María A Palacios
- Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Granada, 18071 Granada, Spain.
| | - Yanling Li
- Sorbonne Université Institut Parisien de Chimie Moléculaire, CNRS UMR 8232 4 place Jussieu 75252, Paris cedex 5, France
| | - Mykhaylo Ozerov
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA
| | - J Krzystek
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA
| | - Enrique Colacio
- Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Granada, 18071 Granada, Spain.
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2
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Shuku Y, Suizu R, Tsuchiizu M, Awaga K. Ideal trigonal prismatic coordination geometry of Co(II) in a honeycomb MOF with a triptycene-based ligand. Chem Commun (Camb) 2023; 59:10105-10108. [PMID: 37519283 DOI: 10.1039/d3cc02986g] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/01/2023]
Abstract
A metal-organic framework (MOF) comprised of cobalt ions and triptycene-based 3-fold symmetric bridging ligands 9,10-[1,2]benzenoanthracene-2,3,6,7,14,15(9H,10H)-hexaone (o-TT) was prepared. Single-crystal structure analysis revealed a 2D honeycomb network structure and the ideal trigonal prismatic geometry of the Co(II) ion. The magnetic anisotropy of the Co(II) ion in the trigonal prism coordination geometry was analyzed via magnetic measurements and model calculations.
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Affiliation(s)
- Yoshiaki Shuku
- Department of Chemistry & Integrated Research Consortium on Chemical Sciences (IRCCS), Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan.
| | - Rie Suizu
- Department of Chemistry & Integrated Research Consortium on Chemical Sciences (IRCCS), Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan.
- Japan Science and Technology Agency (JST), PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
| | - Masahisa Tsuchiizu
- Department of Physics, Nara Women's University, Kitauoyanishi-machi, Nara 630-8506, Japan
| | - Kunio Awaga
- Department of Chemistry & Integrated Research Consortium on Chemical Sciences (IRCCS), Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan.
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3
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Yao B, Zhang YQ, Deng YF, Li T, Zhang YZ. Series of Benzoquinone-Bridged Dicobalt(II) Single-Molecule Magnets. Inorg Chem 2022; 61:15392-15397. [PMID: 36134570 DOI: 10.1021/acs.inorgchem.2c01851] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Mononuclear complexes within a particular coordination geometry have been well recognized for high-performance single-molecule magnets (SMMs), while the incorporation of such well-defined geometric ions into multinuclear complexes remains less explored. Using the rigid 2-(di(1H-pyrazol-1-yl)methyl)-6-(1H-pyrazol-1-yl)pyridine (PyPz3) ligand, here, we prepared a series of benzoquinone-bridged dicobalt(II) SMMs [{(PyPz3)Co}2(L)][PF6]2, (1, L = 2,5-dioxo-1,4-benzoquinone (dhbq2-); 2, L = chloranilate (CA2-); and 3, L = bromanilate (BA2-)), in which each Co(II) center adopts a distorted trigonal prismatic (TPR) geometry and the distortion increases with the sizes of 3,6-substituent groups (H (1) < Cl (2) < Br (3)). Accordingly, the magnetic study revealed that the axial anisotropy parameter (D) of the Co ions decreased from -78.5 to -56.5 cm-1 in 1-3, while the rhombic one (E) increased significantly. As a result, 1 exhibited slow relaxation of magnetization under a zero dc field, while both 2 and 3 showed only the field-induced SMM behaviors, likely due to the increased rhombic anisotropy that leads to the serious quantum tunneling of the magnetization. Our study demonstrated that the relaxation dynamics and performances of a multinuclear complex are strongly dependent on the coordination geometry of the local metal ions, which may be engineered by modifying the substituent groups.
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Affiliation(s)
- Binling Yao
- Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China
| | - Yi-Quan Zhang
- Jiangsu Key Laboratory for NSLSCS, School of Physical Science and Technology, Nanjing Normal University, Nanjing 210023, China
| | - Yi-Fei Deng
- Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China
| | - Tianran Li
- 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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4
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Pashanova KI, Poddel'sky AI, Piskunov AV. Complexes of “late” transition metals of the 3d row based on functionalized o-iminobenzoquinone type ligands: Interrelation of molecular and electronic structure, magnetic behaviour. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2021.214399] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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5
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Campanella AJ, Ozvat TM, Zadrozny JM. Ligand design of zero-field splitting in trigonal prismatic Ni(II) cage complexes. Dalton Trans 2022; 51:3341-3348. [PMID: 35137732 PMCID: PMC8992015 DOI: 10.1039/d1dt02156g] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Complexes of encapsulated metal ions are promising potential metal-based electron paramagnetic resonance imaging (EPRI) agents due to zero-field splitting. Herein, we synthesize and magnetically characterize a series of five new Ni(II) complexes based on a clathrochelate ligand to provide a new design strategy for zero-field splitting in an encaged environment. UV-Vis and X-ray single-crystal diffraction experiments demonstrate slight physical and electronic structure changes as a function of the differing substituents. The consequence of these changes at the remote apical and sidearm positions of the encaging ligands is a zero-field splitting parameter (D) that varies over a large range of 11 cm-1. These results demonstrate a remarkable flexibility of the zero-field splitting and electronic structure in nickelous cages and give a clear toolkit for modifying zero-field splitting in highly stable ligand shells.
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Affiliation(s)
- Anthony J Campanella
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA.
| | - Tyler M Ozvat
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA.
| | - Joseph M Zadrozny
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA.
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6
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Landart Gereka A, Quesada-Moreno MM, Díaz-Ortega IF, Nojiri H, Ozerov M, Krzystek J, Palacios MA, Colacio E. Large easy-axis magnetic anisotropy in a series of trigonal prismatic mononuclear cobalt (II) complexes with zero-field hidden single-molecule magnet behaviour: The important role of the distortion of the coordination sphere and intermolecular interactions on the slow relaxation. Inorg Chem Front 2022. [DOI: 10.1039/d2qi00275b] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The complexes [Co(L)]X·S (X = CoCl42- , S = CH3CN (1); X = ZnCl42- , S = CH3OH (2)), [Co(L)]X2·S (X = ClO4-, S = 2CH3OH (3) and X =...
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7
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Kwon HY, Ashley DC, Jakubikova E. Halogenation affects driving forces, reorganization energies and "rocking" motions in strained [Fe(tpy) 2] 2+ complexes. Dalton Trans 2021; 50:14566-14575. [PMID: 34586133 DOI: 10.1039/d1dt02314d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Controlling the energetics of spin crossover (SCO) in Fe(II)-polypyridine complexes is critical for designing new multifunctional materials or tuning the excited-state lifetimes of iron-based photosensitizers. It is well established that the Fe-N "breathing" mode is important for intersystem crossing from the singlet to the quintet state, but this does not preclude other, less obvious, structural distortions from affecting SCO. Previous work has shown that halogenation at the 6 and 6'' positions of tpy (tpy = 2,2';6',2''-terpyridine) in [Fe(tpy)2]2+ dramatically increased the lifetime of the excited MLCT state and also had a large impact on the ground state spin-state energetics. To gain insight into the origins of these effects, we used density functional theory calculations to explore how halogenation impacts spin-state energetics and molecular structure in this system. Based on previous work we focused on the ligand "rocking" motion associated with SCO in [Fe(tpy)2]2+ by constructing one-dimensional potential energy surfaces (PESs) along the tpy rocking angle for various spin states. It was found that halogenation has a clear and predictable impact on ligand rocking and spin-state energetics. The rocking is correlated to numerous other geometrical distortions, all of which likely affect the reorganization energies for spin-state changes. We have quantified trends in reorganization energy and also driving force for various spin-state changes and used them to interpret the experimentally measured excited-state lifetimes.
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Affiliation(s)
- Hyuk-Yong Kwon
- Department of Chemistry, North Carolina State University, 2620 Yarbrough Dr., Raleigh, NC 27695, USA.
| | - Daniel C Ashley
- Department of Chemistry, North Carolina State University, 2620 Yarbrough Dr., Raleigh, NC 27695, USA.
| | - Elena Jakubikova
- Department of Chemistry, North Carolina State University, 2620 Yarbrough Dr., Raleigh, NC 27695, USA.
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8
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Grieve ML, Davey PRWJ, Forsyth CM, Paterson BM. The Synthesis of a Bis(thiosemicarbazone) Macrocyclic Ligand and the Mn(II), Co(II), Zn(II) and 68Ga(III) Complexes. Molecules 2021; 26:3646. [PMID: 34203751 PMCID: PMC8232287 DOI: 10.3390/molecules26123646] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Revised: 06/10/2021] [Accepted: 06/11/2021] [Indexed: 11/28/2022] Open
Abstract
A 1,4,7,10-tetraazacyclododecane (cyclen) variant bearing two thiosemicarbazone pendant groups has been prepared. The ligand forms complexes with Mn2+, Co2+ and Zn2+. X-ray crystallography of the Mn2+, Co2+ and Zn2+ complexes showed that the ligand provides a six-coordinate environment for the metal ions. The Mn2+ and Zn2+ complexes exist in the solid state as racemic mixtures of the Δ(δ,δ,δ,δ)/Λ(λ,λ,λ,λ) and Δ(λ,λ,λ,λ)/Λ(δ,δ,δ,δ) diastereomers, and the Co2+ complex exists as the Δ(δ,δ,δ,δ)/Λ(λ,λ,λ,λ) and Δ(λ,λ,λ,δ)/Λ(δ,δ,δ,λ) diastereomers. Density functional theory calculations indicated that the relative energies of the diastereomers are within 10 kJ mol-1. Magnetic susceptibility of the complexes indicated that both the Mn2+ and Co2+ ions are high spin. The ligand was radiolabelled with gallium-68, in the interest of developing new positron emission tomography imaging agents, which produced a single species in high radiochemical purity (>95%) at 90 °C for 10 min.
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Affiliation(s)
- Melyssa L. Grieve
- School of Chemistry, Monash University, Clayton, VIC 3800, Australia; (M.L.G.); (P.R.W.J.D.); (C.M.F.)
| | - Patrick R. W. J. Davey
- School of Chemistry, Monash University, Clayton, VIC 3800, Australia; (M.L.G.); (P.R.W.J.D.); (C.M.F.)
| | - Craig M. Forsyth
- School of Chemistry, Monash University, Clayton, VIC 3800, Australia; (M.L.G.); (P.R.W.J.D.); (C.M.F.)
| | - Brett M. Paterson
- School of Chemistry, Monash University, Clayton, VIC 3800, Australia; (M.L.G.); (P.R.W.J.D.); (C.M.F.)
- Monash Biomedical Imaging, Monash University, Clayton, VIC 3800, Australia
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9
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Anandababu K, Ramasubramanian R, Wadepohl H, Comba P, Johnee Britto N, Jaccob M, Mayilmurugan R. A Structural and Functional Model for the Tris-Histidine Motif in Cysteine Dioxygenase. Chemistry 2019; 25:9540-9547. [PMID: 31090109 DOI: 10.1002/chem.201901005] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2019] [Revised: 04/23/2019] [Indexed: 01/14/2023]
Abstract
The iron(II) complexes [Fe(L)(MeCN)3 ](SO3 CF3 )2 (L are two derivatives of tris(2-pyridyl)-based ligands) have been synthesized as models for cysteine dioxygenase (CDO). The molecular structure of one of the complexes exhibits octahedral coordination geometry and the Fe-Npy bond lengths [1.953(4)-1.972(4) Å] are similar to those in the Cys-bound FeII -CDO; Fe-NHis : 1.893-2.199 Å. The iron(II) centers of the model complexes exhibit relatively high FeIII/II redox potentials (E1/2 =0.988-1.380 V vs. ferrocene/ferrocenium electrode, Fc/Fc+ ), within the range for O2 activation and typical for the corresponding nonheme iron enzymes. The reaction of in situ generated [Fe(L)(MeCN)(SPh)]+ with excess O2 in acetonitrile (MeCN) yields selectively the doubly oxygenated phenylsulfinic acid product. Isotopic labeling studies using 18 O2 confirm the incorporation of both oxygen atoms of O2 into the product. Kinetic and preliminary DFT studies reveal the involvement of an FeIII peroxido intermediate with a rhombic S= 1 / 2 FeIII center (687-696 nm; g≈2.46-2.48, 2.13-2.15, 1.92-1.94), similar to the spectroscopic signature of the low-spin Cys-bound FeIII CDO (650 nm, g≈2.47, 2.29, 1.90). The proposed FeIII peroxido intermediates have been trapped, and the O-O stretching frequencies are in the expected range (approximately 920 and 820 cm-1 for the alkyl- and hydroperoxido species, respectively). The model complexes have a structure similar to that of the enzyme and structural aspects as well as the reactivity are discussed.
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Affiliation(s)
- Karunanithi Anandababu
- Bioinorganic Chemistry Laboratory/Physical Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai, 625021, India
| | - Ramamoorthy Ramasubramanian
- Bioinorganic Chemistry Laboratory/Physical Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai, 625021, India
| | - Hubert Wadepohl
- Anorganisch-Chemisches Institut and Interdisciplinary Center for Scientific Computing, Universität Heidelberg, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
| | - Peter Comba
- Anorganisch-Chemisches Institut and Interdisciplinary Center for Scientific Computing, Universität Heidelberg, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
| | | | - Madhavan Jaccob
- Department of Chemistry, Loyola College, Chennai, 600034, India
| | - Ramasamy Mayilmurugan
- Bioinorganic Chemistry Laboratory/Physical Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai, 625021, India
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10
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Brown RT, Fletcher NC, Danos L, Halcovitch NR. A Tripodal Ruthenium(II) Polypyridyl Complex with pH Controlled Emissive Quenching. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800891] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Rodney T. Brown
- School of Chemistry and Chemical Engineering; Queen's University Belfast; BT9 5AG Belfast Northern Ireland UK
| | - Nicholas C. Fletcher
- Department of Chemistry; Lancaster University; Bailrigg 4YB Lancaster, LA1 UK
- School of Chemistry and Chemical Engineering; Queen's University Belfast; BT9 5AG Belfast Northern Ireland UK
| | - Lefteris Danos
- Department of Chemistry; Lancaster University; Bailrigg 4YB Lancaster, LA1 UK
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11
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Petzold H, Hörner G, Schnaubelt L, Rüffer T. Slow spin crossover in bis-meridional Fe 2+ complexes through spin-state auto-adaptive N6/N8 coordination. Dalton Trans 2018; 47:17257-17265. [PMID: 30488935 DOI: 10.1039/c8dt03652g] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Fe2+ spin crossover (SCO) complexes with long-lived excited high-spin (HS) states are promising molecular switches. An enhanced kinetic stability of spin-state isomers can be expected to foster applications beyond the limits of cooperative SCO. In this study, we describe a new approach to slow down the spin-state exchange by simple commutation of a phenyl substituent by a pyridyl substituent. To this end, N4 ligand 6-(3-(pyridin-2-yl)-1H-pyrazol-1-yl)-2,2'-bipyridine (3b) is synthesized as an N4 homologue of the well-established meridional N3 ligands motif. Phenyl-substituted 6-(3-phenyl-1H-pyrazol-1-yl)-2,2'-bipyridine (3a) serves as an intrinsic N3 reference throughout. 3b offers variable coordination numbers, N3 versus N3(+1) and N4, reflecting the preferences of the metal center. As is shown herein through an extended solid-state structure-chemical and solution-state NMR study, which is augmented by density-functional theory modeling, both the coordination geometry and its structural dynamics are indeed highly sensitive towards the expansion of the nominal donor number. The additional donors in 3b introduced through the phenyl-pyridine commutation actually give rise to a rich and diverse stereochemistry of the derived Zn2+ and Fe2+ complexes. Notably, even within a single complex unit coordination of 3b ranges from strongly distorted N3 coordination with a long assisting additional contact (Zn2+ and Fe2+) to a more symmetric N2(+2) or N4 situation in Fe2+. DFT modeling unravels that the additional donors are hemi-labile and coordinate to the Fe2+ only in HS state, leaving the elusive low-spin (LS) state in a fairly undisturbed octahedral environment with 3b being N3 coordinate. That is, the coordination number of the complex autogeneously responds to the altered spin-state. Necessarily this switch in coordination number requires strong structural changes upon SCO. This leads to increased activation barriers for SCO as could be deduced from a temperature-dependent analysis of the dynamic 1H NMR-line broadening and corroborated by accompanying theoretical analysis of the SCO reaction coordinate. For [Fe(3b)2]2+ long spin-state lifetimes τ > 1 ms prevail below the characteristic temperature T (1 ms) = 235 K; this value should be compared with a lifetime of only 150 ns derived for the close analogue [Fe(3a)2]2+. The principle applied herein is general and allows transferring of LS Fe2+ complexes with suitably placed phenyl substituents into SCO complexes with spin-state adaptive coordination number and hence long-lived HS excited states.
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Affiliation(s)
- Holm Petzold
- TU Chemnitz, Institut für Chemie, Anorganische Chemie, Straße der Nationen 62, 09111 Chemnitz, Germany.
| | - Gerald Hörner
- TU Berlin, Institut für Chemie, Straße des 17. Juni 135, 10623 Berlin, Germany.
| | - Linda Schnaubelt
- TU Chemnitz, Institut für Chemie, Anorganische Chemie, Straße der Nationen 62, 09111 Chemnitz, Germany.
| | - Tobias Rüffer
- TU Chemnitz, Institut für Chemie, Anorganische Chemie, Straße der Nationen 62, 09111 Chemnitz, Germany.
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12
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Carreras A, Bernuz E, Marugan X, Llunell M, Alemany P. Effects of Temperature on the Shape and Symmetry of Molecules and Solids. Chemistry 2018; 25:673-691. [DOI: 10.1002/chem.201801682] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2018] [Revised: 07/17/2018] [Indexed: 01/22/2023]
Affiliation(s)
- Abel Carreras
- Donostia International Physics Center (DIPC) Paseo Manuel de Lardizabal 4 20018 Donostia, Euskadi Spain
| | - Efrem Bernuz
- Departament de Ciència dels Materials i Química Física andInstitut de Química Teòrica i Computacional (IQTCUB)Universitat de Barcelona Diagonal 647 08028 Barcelona, Catalunya Spain
| | - Xavier Marugan
- Departament de Ciència dels Materials i Química Física andInstitut de Química Teòrica i Computacional (IQTCUB)Universitat de Barcelona Diagonal 647 08028 Barcelona, Catalunya Spain
| | - Miquel Llunell
- Departament de Ciència dels Materials i Química Física andInstitut de Química Teòrica i Computacional (IQTCUB)Universitat de Barcelona Diagonal 647 08028 Barcelona, Catalunya Spain
| | - Pere Alemany
- Departament de Ciència dels Materials i Química Física andInstitut de Química Teòrica i Computacional (IQTCUB)Universitat de Barcelona Diagonal 647 08028 Barcelona, Catalunya Spain
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13
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Yao B, Deng YF, Li T, Xiong J, Wang BW, Zheng Z, Zhang YZ. Construction and Magnetic Study of a Trigonal-Prismatic Cobalt(II) Single-Ion Magnet. Inorg Chem 2018; 57:14047-14051. [DOI: 10.1021/acs.inorgchem.8b02692] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Binling Yao
- Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China
| | - Yi-Fei Deng
- Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China
| | - Tianran Li
- Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China
| | - Jin Xiong
- Beijing National Laboratory of Molecular Science, College of Chemistry and Molecular Engineering, State Key Laboratory of Rare Earth Materials Chemistry and Applications, Peking University, Beijing 100871, P. R. China
| | - Bing-Wu Wang
- Beijing National Laboratory of Molecular Science, College of Chemistry and Molecular Engineering, State Key Laboratory of Rare Earth Materials Chemistry and Applications, Peking University, Beijing 100871, P. R. China
| | - Zhiping Zheng
- 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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14
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Piskunov AV, Pashanova KI, Bogomyakov AS, Smolyaninov IV, Starikov AG, Fukin GK. Cobalt complexes with hemilabile o-iminobenzoquinonate ligands: a novel example of redox-induced electron transfer. Dalton Trans 2018; 47:15049-15060. [PMID: 30303221 DOI: 10.1039/c8dt02733a] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The tetracoordinated square-planar CoIII complex (imSQC(O)Ph)CoIII(APC(O)Ph) (1) bearing a radical anion and the closed-shell o-amidophenolate forms of the functionalized o-aminophenol H2LC(O)Ph were synthesized. The intermediate spin state (SCo = 1) CoIII center was found for compound 1. The cyclic voltammogram of derivative 1 contains two oxidative processes and one reductive redox process as well as an additional multi-electron wave at high negative potentials above -2 V, which can involve both the ligand and metal center. One-electron oxidation of 1 by silver triflate produces the [(imSQC(O)Ph)CoII(imQC(O)Ph)]OTf·2toluene (2) derivative with the trigonal prismatic coordination environment of the metal arising from the additional coordination of -C(O)Ph hemilabile groups. This is a first example of a trigonal prismatic coordination polyhedron in cobalt-based complexes featuring o-iminobenzoquinone ligands. The trigonal prismatic geometry achieved by the unique flexibility of the ligand allows metal-to-ligand redox-induced electron transfer (RIET). Chemical oxidation of complex 1 promotes the reduction of CoIII to CoII in compound 2 due to the redox-active nature of o-iminobenzoquinonate ligands. Remarkably, this is the first example of RIET in cobalt-based derivatives with this type of ligand. The oxidative states of the ligands and cobalt ion in both complexes were unequivocally established according to the X-ray data collection by using the utility of "metric oxidation state" (MOS). The spin states of the metal centers were unambiguously determined by density functional theory. The strong antiferromagnetic exchange via metal-ligand interactions is dominant in compounds 1 and 2, giving the doublet (S = 1/2) and triplet (S = 1) ground spin state, respectively.
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Affiliation(s)
- Alexandr V Piskunov
- G.A. Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, Laboratory of Organoelement Compounds, 49 Tropinina Street, 603137, Nizhny Novgorod, Russian Federation.
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15
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Synthesis, crystal structure, theoretical studies and biological properties of three novel trigonal prismatic Co(II), Ni(II) and Cu(II) macroacyclic Schiff base complexes incorporating piperazine moiety. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2018.02.028] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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16
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Singh C, Mukhopadhyay S, Das SK. Polyoxometalate-Supported Bis(2,2′-bipyridine)mono(aqua)nickel(II) Coordination Complex: an Efficient Electrocatalyst for Water Oxidation. Inorg Chem 2018; 57:6479-6490. [DOI: 10.1021/acs.inorgchem.8b00541] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Chandani Singh
- School of Chemistry, University of Hyderabad, Hyderabad-500046, India
| | | | - Samar K. Das
- School of Chemistry, University of Hyderabad, Hyderabad-500046, India
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17
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Ashley DC, Jakubikova E. Ray-Dutt and Bailar Twists in Fe(II)-Tris(2,2′-bipyridine): Spin States, Sterics, and Fe–N Bond Strengths. Inorg Chem 2018; 57:5585-5596. [DOI: 10.1021/acs.inorgchem.8b00560] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Daniel C. Ashley
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695, United States
| | - Elena Jakubikova
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695, United States
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18
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Schnidrig S, Bachmann C, Müller P, Weder N, Spingler B, Joliat-Wick E, Mosberger M, Windisch J, Alberto R, Probst B. Structure-Activity and Stability Relationships for Cobalt Polypyridyl-Based Hydrogen-Evolving Catalysts in Water. CHEMSUSCHEM 2017; 10:4570-4580. [PMID: 29052339 DOI: 10.1002/cssc.201701511] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2017] [Revised: 10/14/2017] [Indexed: 06/07/2023]
Abstract
A series of eight new and three known cobalt polypyridyl-based hydrogen-evolving catalysts (HECs) with distinct electronic and structural differences are benchmarked in photocatalytic runs in water. Methylene-bridged bis-bipyridyl is the preferred scaffold, both in terms of stability and rate. For a cobalt complex of the tetradentate methanol-bridged bispyridyl-bipyridyl complex [CoII Br(tpy)]Br, a detailed mechanistic picture is obtained by combining electrochemistry, spectroscopy, and photocatalysis. In the acidic branch, a proton-coupled electron transfer, assigned to formation of CoIII -H, is found upon reduction of CoII , in line with a pKa (CoIII -H) of approximately 7.25. Subsequent reduction (-0.94 V vs. NHE) and protonation close the catalytic cycle. Methoxy substitution on the bipyridyl scaffold results in the expected cathodic shift of the reduction, but fails to change the pKa (CoIII -H). An analysis of the outcome of the benchmarking in view of this postulated mechanism is given along with an outlook for design criteria for new generations of catalysts.
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Affiliation(s)
- Stephan Schnidrig
- Department of Chemistry, University of Zürich, Winterthurerstrasse 190, Switzerland
| | - Cyril Bachmann
- Department of Chemistry, University of Zürich, Winterthurerstrasse 190, Switzerland
| | - Peter Müller
- Department of Chemistry, University of Zürich, Winterthurerstrasse 190, Switzerland
| | - Nicola Weder
- Department of Chemistry, University of Zürich, Winterthurerstrasse 190, Switzerland
| | - Bernhard Spingler
- Department of Chemistry, University of Zürich, Winterthurerstrasse 190, Switzerland
| | - Evelyne Joliat-Wick
- Department of Chemistry, University of Zürich, Winterthurerstrasse 190, Switzerland
| | - Mathias Mosberger
- Department of Chemistry, University of Zürich, Winterthurerstrasse 190, Switzerland
| | - Johannes Windisch
- Department of Chemistry, University of Zürich, Winterthurerstrasse 190, Switzerland
| | - Roger Alberto
- Department of Chemistry, University of Zürich, Winterthurerstrasse 190, Switzerland
| | - Benjamin Probst
- Department of Chemistry, University of Zürich, Winterthurerstrasse 190, Switzerland
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19
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Structural Dynamics of Spin Crossover in Iron(II) Complexes with Extended-Tripod Ligands. INORGANICS 2017. [DOI: 10.3390/inorganics5030060] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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20
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Phan H, Hrudka JJ, Igimbayeva D, Lawson Daku LM, Shatruk M. A Simple Approach for Predicting the Spin State of Homoleptic Fe(II) Tris-diimine Complexes. J Am Chem Soc 2017; 139:6437-6447. [PMID: 28402639 DOI: 10.1021/jacs.7b02098] [Citation(s) in RCA: 79] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
We propose a simple method for predicting the spin state of homoleptic complexes of the Fe(II) d6 ion with chelating diimine ligands. The approach is based on the analysis of a single metric parameter within a free (noncoordinated) ligand: the interatomic separation between the N-donor metal-binding sites. An extensive analysis of existing complexes allows the determination of critical N···N distances that dictate the regions of stability for the high-spin and low-spin complexes, as well as the intermediate range in which the magnetic bistability (spin crossover) can be observed. The prediction has been tested on several complexes that demonstrate the validity of our method.
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Affiliation(s)
- Hoa Phan
- Department of Chemistry and Biochemistry, Florida State University , 95 Chieftan Way, Tallahassee, Florida 32306, United States
| | - Jeremy J Hrudka
- Department of Chemistry and Biochemistry, Florida State University , 95 Chieftan Way, Tallahassee, Florida 32306, United States
| | - Dilyara Igimbayeva
- Department of Chemistry, L. N. Gumilyov Eurasian National University , 5 Munaitpasov Street, 010008 Astana, Kazakhstan
| | - Latévi M Lawson Daku
- Department of Physical Chemistry, University of Geneva , 30 Quai Ernest-Ansermet, CH-1211 Geneva 4, Switzerland
| | - Michael Shatruk
- Department of Chemistry and Biochemistry, Florida State University , 95 Chieftan Way, Tallahassee, Florida 32306, United States
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21
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Alemany P, Casanova D, Alvarez S, Dryzun C, Avnir D. Continuous Symmetry Measures: A New Tool in Quantum Chemistry. REVIEWS IN COMPUTATIONAL CHEMISTRY 2017. [DOI: 10.1002/9781119356059.ch7] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Pere Alemany
- Departament de Química Física and Institut de Química Teòrica i Computacional (IQTCUB); Universitat de Barcelona; Barcelona Spain
| | - David Casanova
- Donostia International Physics Center (DIPC); Kimika Fakultatea, Euskal Herriko Unibertsitatea (UPV/EHU); Donostia Spain
- IKERBASQUE, Basque Foundation for Science; Bilbao Spain
| | - Santiago Alvarez
- Departament de Química Inorgànica and Institut de Química Teòrica i Computacional (IQTCUB); Universitat de Barcelona; Barcelona Spain
| | - Chaim Dryzun
- Institute of Chemistry and The Lise Meitner Minerva Center for Computational Quantum Chemistry; The Hebrew University of Jerusalem; Jerusalem Israel
| | - David Avnir
- Institute of Chemistry and The Lise Meitner Minerva Center for Computational Quantum Chemistry; The Hebrew University of Jerusalem; Jerusalem Israel
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22
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Sanjeewa LD, McMillen CD, McGuire MA, Kolis JW. Manganese Vanadate Chemistry in Hydrothermal BaF2 Brines: Ba3Mn2(V2O7)2F2 and Ba7Mn8O2(VO4)2F23. Inorg Chem 2016; 55:12512-12515. [DOI: 10.1021/acs.inorgchem.6b02355] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Liurukara D. Sanjeewa
- Department of Chemistry and Center for Optical Materials
Science and Engineering Technologies, Clemson University, Clemson, South Carolina 29634-0973, United States
| | - Colin D. McMillen
- Department of Chemistry and Center for Optical Materials
Science and Engineering Technologies, Clemson University, Clemson, South Carolina 29634-0973, United States
| | - Michael A. McGuire
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Joseph W. Kolis
- Department of Chemistry and Center for Optical Materials
Science and Engineering Technologies, Clemson University, Clemson, South Carolina 29634-0973, United States
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23
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Tsukada S, Abe N, Gunji T. Highly distorted octahedral molybdenum(II) complexes: Synthesis, crystal structure, and properties of [Mo(S2C6H4)(CO)2(PMe Ph3−)2] (n= 0–3). Polyhedron 2016. [DOI: 10.1016/j.poly.2016.05.035] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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24
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Knight JC, Amoroso AJ, Edwards PG, Singh N, Ward BD. Shaping and enforcing coordination spheres: probing the ability of tripodal ligands to favour trigonal prismatic geometry. Dalton Trans 2016; 45:10630-42. [PMID: 27273116 DOI: 10.1039/c6dt01165a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report two tripodal frameworks, mono(2,2'-bipyrid-6-yl)bis(2-pyridyl)methanol () and bis(2,2'-bipyrid-6-yl)mono(2-pyridyl)methanol () which have one and two bipyridyl arms, respectively. Both ligands form complexes with the first row transition metals. Both ligands appear to overcome the steric strain involved in twisting the ligand to produce an octahedral complex and the solid state structures in general show more octahedral character than complexes of the related ligand, tris(2,2'-bipyrid-6-yl)methanol (). Continuous Shape Mapping (CShM) calculations based on crystallographic data reveal that is incapable of enforcing a trigonal prismatic (TP) co-ordination geometry in the solid state, surprisingly even upon co-ordination to metals with no stereochemical preference such as cadmium (S(TP) = 7.15 and S(Oh) = 3.95). However, ligand clearly maintains an ability to enforce a trigonal prismatic conformation which is demonstrated in the crystal structures of the Mn(II) and Cd(II) complexes (S(TP) = 0.75 and 1.09, respectively). While maintains near-TP configurations in the presence of metal ions with strong octahedral preferences, distorts towards predominantly octahedral co-ordination geometries, increasing in the order Co(II) < Ni(II) < Fe(II) and no trigonal prismatic structures.
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Affiliation(s)
- James C Knight
- School of Chemistry, Cardiff University, Cardiff, South Glamorgan.
| | - Angelo J Amoroso
- School of Chemistry, Cardiff University, Cardiff, South Glamorgan.
| | - Peter G Edwards
- School of Chemistry, Cardiff University, Cardiff, South Glamorgan.
| | - Neha Singh
- School of Chemistry, Cardiff University, Cardiff, South Glamorgan.
| | - Benjamin D Ward
- School of Chemistry, Cardiff University, Cardiff, South Glamorgan.
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25
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Stock P, Deck E, Hohnstein S, Korzekwa J, Meyer K, Heinemann FW, Breher F, Hörner G. Molecular Spin Crossover in Slow Motion: Light-Induced Spin-State Transitions in Trigonal Prismatic Iron(II) Complexes. Inorg Chem 2016; 55:5254-65. [PMID: 27159332 DOI: 10.1021/acs.inorgchem.6b00238] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A straightforward access is provided to iron(II) complexes showing exceedingly slow spin-state interconversion by utilizing trigonal-prismatic directing ligands (L(n)) of the extended-tripod type. A detailed analysis of the interrelations between complex structure (X-ray diffraction, density functional theory) and electronic character (SQUID magnetometry, Mössbauer spectroscopy, UV/vis spectroscopy) of the iron(II) center in mononuclear complexes [FeL(n)] reveals spin crossover to occur along a coupled breathing/torsion reaction coordinate, shuttling the complex between the octahedral low-spin state and the trigonal-prismatic high-spin state along Bailar's trigonal twist pathway. We associate both the long spin-state lifetimes in the millisecond domain close to room temperature and the substantial barriers against thermal scrambling (Ea ≈ 33 kJ mol(-1), from Arrhenius analysis) with stereochemical constraints. In particular, the topology of the κ(6)N ligands controls the temporary and structural dynamics during spin crossover.
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Affiliation(s)
- Philipp Stock
- Institut für Chemie, Technische Universität Berlin , Strasse des 17. Juni 135, 10623 Berlin, Germany
| | - Eva Deck
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT) , Engesserstrasse 15, 76131 Karlsruhe, Germany
| | - Silvia Hohnstein
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT) , Engesserstrasse 15, 76131 Karlsruhe, Germany
| | - Jana Korzekwa
- Department Chemie und Pharmazie, Anorganische Chemie, Friedrich-Alexander-Universität Erlangen-Nürnberg , Egerlandstraße 1, 91058 Erlangen, Germany
| | - Karsten Meyer
- Department Chemie und Pharmazie, Anorganische Chemie, Friedrich-Alexander-Universität Erlangen-Nürnberg , Egerlandstraße 1, 91058 Erlangen, Germany
| | - Frank W Heinemann
- Department Chemie und Pharmazie, Anorganische Chemie, Friedrich-Alexander-Universität Erlangen-Nürnberg , Egerlandstraße 1, 91058 Erlangen, Germany
| | - Frank Breher
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT) , Engesserstrasse 15, 76131 Karlsruhe, Germany
| | - Gerald Hörner
- Institut für Chemie, Technische Universität Berlin , Strasse des 17. Juni 135, 10623 Berlin, Germany
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26
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Hu FL, Wang SL, Wu B, Yu H, Wang F, Lang JP. Ligand geometry-directed assembly of seven entangled coordination polymers. CrystEngComm 2014. [DOI: 10.1039/c3ce42545b] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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27
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Bachmann C, Guttentag M, Spingler B, Alberto R. 3d Element Complexes of Pentadentate Bipyridine-Pyridine-Based Ligand Scaffolds: Structures and Photocatalytic Activities. Inorg Chem 2013; 52:6055-61. [DOI: 10.1021/ic4004017] [Citation(s) in RCA: 82] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Cyril Bachmann
- Institute of Inorganic Chemistry, University of Zurich, Winterthurerstrasse 190, 8057
Zurich, Switzerland
| | - Miguel Guttentag
- Institute of Inorganic Chemistry, University of Zurich, Winterthurerstrasse 190, 8057
Zurich, Switzerland
| | - Bernhard Spingler
- Institute of Inorganic Chemistry, University of Zurich, Winterthurerstrasse 190, 8057
Zurich, Switzerland
| | - Roger Alberto
- Institute of Inorganic Chemistry, University of Zurich, Winterthurerstrasse 190, 8057
Zurich, Switzerland
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28
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Liu YY, Liu HY, Ma JF, Yang Y, Yang J. Syntheses, structures and photoluminescent properties of Zn(ii) and Cd(ii) coordination polymers with flexible tripodal triazole-containing ligands. CrystEngComm 2013. [DOI: 10.1039/c2ce26958a] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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29
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Halcrow MA. Jahn–Teller distortions in transition metal compounds, and their importance in functional molecular and inorganic materials. Chem Soc Rev 2013; 42:1784-95. [DOI: 10.1039/c2cs35253b] [Citation(s) in RCA: 285] [Impact Index Per Article: 25.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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30
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Nippe M, Khnayzer RS, Panetier JA, Zee DZ, Olaiya BS, Head-Gordon M, Chang CJ, Castellano FN, Long JR. Catalytic proton reduction with transition metal complexes of the redox-active ligand bpy2PYMe. Chem Sci 2013. [DOI: 10.1039/c3sc51660a] [Citation(s) in RCA: 151] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
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31
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Li MY, Sevov SC. Synthesis, characterization, and magnetic studies of a series of metal–mellitate coordination polymers. CrystEngComm 2013. [DOI: 10.1039/c2ce26866c] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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32
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Saad FA, Buurma NJ, Amoroso AJ, Knight JC, Kariuki BM. Co-ordination behaviour of a novel bisthiourea tripodal ligand: structural, spectroscopic and electrochemical properties of a series of transition metal complexes. Dalton Trans 2012; 41:4608-17. [PMID: 22373815 DOI: 10.1039/c2dt11732k] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The synthesis of a thiourea substituted derivative of tris(pyridyl-2-methyl)amine (TPA) is reported. Two of the three pyridine rings are substituted in the 6-position with benzoylthiourea groups. These thiourea groups undergo intramolecular hydrogen bonding to form six-membered rings which leaves one N-H group available to form hydrogen bonds with other molecules. This reports details how the complexation of this new ligand with transition metal ions yields complexes with differing geometries. Seven co-ordinate Mn(II) and Cd(II), six co-ordinate Ni(II) and five co-ordinate Co(II), Cu(II) and Zn(II) complexes have been isolated.
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Affiliation(s)
- Fawaz A Saad
- Cardiff University of Wales-Department of Chemistry, Main Building, Park Place, Cardiff, CF10 3AT, United Kingdom
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Knight JC, Prabaharan R, Amoroso AJ, Edwards PG, Ooi LL. Synthesis and co-ordination chemistry of tris(picolyl-2-carboxyamido-6-pyridyl) methanol: A ligand with a strong preference for trigonal prismatic geometries. Polyhedron 2012. [DOI: 10.1016/j.poly.2011.09.040] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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34
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Baker NCA, Fletcher NC, Horton PN, Hursthouse MB. Ruthenium cryptates with an unusual selectivity for nitrate. Dalton Trans 2012; 41:7005-12. [DOI: 10.1039/c2dt12446g] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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35
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Trapp I, Löble M, Meyer J, Breher F. Copper complexes of tripodal κ6N-donor ligands: A structural, EPR spectroscopic and electrochemical study. Inorganica Chim Acta 2011. [DOI: 10.1016/j.ica.2011.02.045] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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36
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Cremades E, Echeverría J, Alvarez S. The Trigonal Prism in Coordination Chemistry. Chemistry 2010; 16:10380-96. [DOI: 10.1002/chem.200903032] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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37
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Ruggi A, Berenguel Alonso M, Reinhoudt DN, Velders AH. An iridium(iii)-caged complex with low oxygen quenching. Chem Commun (Camb) 2010; 46:6726-8. [DOI: 10.1039/c0cc01178a] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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