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Ferraz Lobato L, Ciattini S, Gallo A, Allão Cassaro RA, Sorace L, Poneti G. Thermodynamics of spin crossover in a bis(terpyridine) cobalt(II) complex featuring a thioether functionality. Dalton Trans 2024; 53:9933-9941. [PMID: 38808660 DOI: 10.1039/d4dt00574k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2024]
Abstract
In this contribution, a terpyridine-based ligand bearing a thioether functionality is used to prepare a new cobalt(II) spin crossover complex: [Co(TerpyPhSMe)2](PF6)2 (1), where TerpyPhSMe is 4'-(4-methylthiophenyl)-2,2':6',2''-terpyridine. Its structure, determined by single crystal X-ray diffraction, reveals a mer coordination of the tridentate terpyridine ligands, leading to a tetragonally compressed octahedron. Intermolecular interactions in the crystal lattice freeze the complex in the high spin state in the solid state at all temperatures, as indicated by magnetometry and Electron Paramagnetic Resonance (EPR) spectra. When dissolved in acetonitrile, however, temperature dependent electronic, 1H-NMR and EPR spectra highlight an entropy-driven spin crossover transition, whose thermodynamics parameters have been determined. This is the first report of a cobalt(II) SCO complex featuring a thioether group, allowing its implementation in chemically grown bistable monolayers and may open important perspectives for the use of such systems in molecular spintronics.
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Affiliation(s)
- Lúcio Ferraz Lobato
- Instituto de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, 21941-909, Brazil
| | - Samuele Ciattini
- Interdepartmental Center for Crystallography (CRIST), University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy
| | - Angelo Gallo
- Department of Chemistry, University of Turin, Via Pietro Giuria 7, 10125 Torino, Italy
| | - Rafael A Allão Cassaro
- Instituto de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, 21941-909, Brazil
| | - Lorenzo Sorace
- Department of Chemistry "U. Schiff" and INSTM Research Unit, University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy.
| | - Giordano Poneti
- Instituto de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, 21941-909, Brazil
- Dipartimento di Scienze Ecologiche e Biologiche, Università degli Studi della Tuscia, Largo dell'Università, 01100, Viterbo, Italy.
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Davidson R, Al-Owaedi OA, Milan DC, Zeng Q, Tory J, Hartl F, Higgins SJ, Nichols RJ, Lambert CJ, Low PJ. Effects of Electrode–Molecule Binding and Junction Geometry on the Single-Molecule Conductance of bis-2,2′:6′,2″-Terpyridine-based Complexes. Inorg Chem 2016; 55:2691-700. [DOI: 10.1021/acs.inorgchem.5b02094] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ross Davidson
- Department of Chemistry, Durham University, South
Rd, Durham, DH1 3LE, United Kingdom
| | - Oday A. Al-Owaedi
- Department of Physics, Lancaster University, Lancaster, LA1 4YB, United Kingdom
- Department of Laser Physics, Women Faculty of Science, Babylon University, Hillah, Iraq
| | - David C. Milan
- Department of Chemistry, University of Liverpool, Crown St, Liverpool, L69 7ZD, United Kingdom
| | - Qiang Zeng
- Department of Chemistry, University of Reading, Whiteknights, Reading, RG6 6AD, United Kingdom
- School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510640, Peoples’ Republic of China
| | - Joanne Tory
- Department of Chemistry, University of Reading, Whiteknights, Reading, RG6 6AD, United Kingdom
| | - František Hartl
- Department of Chemistry, University of Reading, Whiteknights, Reading, RG6 6AD, United Kingdom
| | - Simon J. Higgins
- Department of Chemistry, University of Liverpool, Crown St, Liverpool, L69 7ZD, United Kingdom
| | - Richard J. Nichols
- Department of Chemistry, University of Liverpool, Crown St, Liverpool, L69 7ZD, United Kingdom
| | - Colin J. Lambert
- Department of Physics, Lancaster University, Lancaster, LA1 4YB, United Kingdom
| | - Paul J. Low
- School
of Chemistry and Biochemistry, University of Western Australia, 35 Stirling Highway, Crawley, Perth, Washington 6009, Australia
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Chappell S, Brooke C, Nichols RJ, Kershaw Cook LJ, Halcrow M, Ulstrup J, Higgins SJ. Evidence for a hopping mechanism in metal|single molecule|metal junctions involving conjugated metal–terpyridyl complexes; potential-dependent conductances of complexes [M(pyterpy)2]2+ (M = Co and Fe; pyterpy = 4′-(pyridin-4-yl)-2,2′:6′,2′′-terpyridine) in ionic liquid. Faraday Discuss 2016; 193:113-131. [DOI: 10.1039/c6fd00080k] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Extensive studies of various families of conjugated molecules in metal|molecule|metal junctions suggest that the mechanism of conductance is usually tunnelling for molecular lengths < ca. 4 nm, and that for longer molecules, coherence is lost as a hopping element becomes more significant. In this work we present evidence that, for a family of conjugated, redox-active metal complexes, hopping may be a significant factor for even the shortest molecule studied (ca. 1 nm between contact atoms). The length dependence of conductance for two series of such complexes which differ essentially in the number of conjugated 1,4-C6H4- rings in the structures has been studied, and it is found that the junction conductances vary linearly with molecular length, consistent with a hopping mechanism, whereas there is significant deviation from linearity in plots of log(conductance) vs. length that would be characteristic of tunnelling, and the slopes of the log(conductance)–length plots are much smaller than expected for an oligophenyl system. Moreover, the conductances of molecular junctions involving the redox–active molecules, [M(pyterpy)2]2+/3+ (M = Co, Fe) have been studied as a function of electrochemical potential in ionic liquid electrolyte, and the conductance–overpotential relationship is found to fit well with the Kuznetsov–Ulstrup relationship, which is essentially a hopping description.
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Affiliation(s)
- Sarah Chappell
- Department of Chemistry
- University of Liverpool
- Liverpool L69 7ZD
- UK
| | - Carly Brooke
- Department of Chemistry
- University of Liverpool
- Liverpool L69 7ZD
- UK
| | | | | | | | - Jens Ulstrup
- Department of Chemistry
- Technical University of Denmark
- DK-2800 Kgs. Lyngby
- Denmark
| | - Simon J. Higgins
- Department of Chemistry
- University of Liverpool
- Liverpool L69 7ZD
- UK
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Davidson R, Liang JH, Costa Milan D, Mao BW, Nichols RJ, Higgins SJ, Yufit DS, Beeby A, Low PJ. Synthesis, Electrochemistry, and Single-Molecule Conductance of Bimetallic 2,3,5,6-Tetra(pyridine-2-yl)pyrazine-Based Complexes. Inorg Chem 2015; 54:5487-94. [DOI: 10.1021/acs.inorgchem.5b00507] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ross Davidson
- Department of Chemistry, Durham University, South Road, Durham DH1 3LE, U.K
- Department of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7ZD, U.K
- State Key Laboratory of Physical Chemistry of Solid Surfaces and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China
- School of Chemistry and Biochemistry, University of Western Australia, 35 Stirling Highway, Perth, Western Australia 6009, Australia
| | - Jing-Hong Liang
- Department of Chemistry, Durham University, South Road, Durham DH1 3LE, U.K
- Department of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7ZD, U.K
- State Key Laboratory of Physical Chemistry of Solid Surfaces and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China
- School of Chemistry and Biochemistry, University of Western Australia, 35 Stirling Highway, Perth, Western Australia 6009, Australia
| | - David Costa Milan
- Department of Chemistry, Durham University, South Road, Durham DH1 3LE, U.K
- Department of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7ZD, U.K
- State Key Laboratory of Physical Chemistry of Solid Surfaces and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China
- School of Chemistry and Biochemistry, University of Western Australia, 35 Stirling Highway, Perth, Western Australia 6009, Australia
| | - Bing-Wei Mao
- Department of Chemistry, Durham University, South Road, Durham DH1 3LE, U.K
- Department of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7ZD, U.K
- State Key Laboratory of Physical Chemistry of Solid Surfaces and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China
- School of Chemistry and Biochemistry, University of Western Australia, 35 Stirling Highway, Perth, Western Australia 6009, Australia
| | - Richard J. Nichols
- Department of Chemistry, Durham University, South Road, Durham DH1 3LE, U.K
- Department of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7ZD, U.K
- State Key Laboratory of Physical Chemistry of Solid Surfaces and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China
- School of Chemistry and Biochemistry, University of Western Australia, 35 Stirling Highway, Perth, Western Australia 6009, Australia
| | - Simon J. Higgins
- Department of Chemistry, Durham University, South Road, Durham DH1 3LE, U.K
- Department of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7ZD, U.K
- State Key Laboratory of Physical Chemistry of Solid Surfaces and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China
- School of Chemistry and Biochemistry, University of Western Australia, 35 Stirling Highway, Perth, Western Australia 6009, Australia
| | - Dmitry S. Yufit
- Department of Chemistry, Durham University, South Road, Durham DH1 3LE, U.K
- Department of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7ZD, U.K
- State Key Laboratory of Physical Chemistry of Solid Surfaces and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China
- School of Chemistry and Biochemistry, University of Western Australia, 35 Stirling Highway, Perth, Western Australia 6009, Australia
| | - Andrew Beeby
- Department of Chemistry, Durham University, South Road, Durham DH1 3LE, U.K
- Department of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7ZD, U.K
- State Key Laboratory of Physical Chemistry of Solid Surfaces and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China
- School of Chemistry and Biochemistry, University of Western Australia, 35 Stirling Highway, Perth, Western Australia 6009, Australia
| | - Paul J. Low
- Department of Chemistry, Durham University, South Road, Durham DH1 3LE, U.K
- Department of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7ZD, U.K
- State Key Laboratory of Physical Chemistry of Solid Surfaces and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China
- School of Chemistry and Biochemistry, University of Western Australia, 35 Stirling Highway, Perth, Western Australia 6009, Australia
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