Molecular design strategies for spin-crossover (SCO) metal complexes (Fe(II) and Co(II)) for thermoelectricity

Ibrahim, Nik Muhd Jazli Nik; Said, Suhana Mohd; Mainal, Azizah; Sabri, Mohd Faizul Mohd; Abdullah, Norbani; Hasnan, Megat Muhammad Ikhsan Megat; Hassan, H. C.; Salleh, Mohd Faiz Mohd; Mahiyiddin, Wan Amirul Wan Mohd

doi:10.1016/j.materresbull.2020.110828

Cited by 19 publications

(8 citation statements)

References 42 publications

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“…Actually, single crystals can reach moderate (κ ~ 0.1-0.4 W m −1 K −1 [61,62]) or even notable values (κ ~ 1.3 W m −1 K −1 [63]). However, the use of single crystals in BC cooling applications is difficult to foresee because large single crystals of metal complexes are difficult to grow and powderization is expected upon cyclic pressurizationdepressurization, and powder exhibits much smaller thermal conductivity (κ < 0.1 W m −1 K −1 ) [62,64].…”

Section: Discussionmentioning

confidence: 99%

Advances and obstacles in pressure-driven solid-state cooling: A review of barocaloric materials

Lloveras

Tamarit

2021

MRS Energy & Sustainability

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Solid-state caloric effects promise since decades a disruptive cooling technology that should be more efficient and cleaner than current vapor compression. However, despite relevant achievements have been made, it is still difficult to foresee the time left for the development and wide implementation of competitive devices. Recent progress in the response of materials under hydrostatic pressure offers hope for overcoming some of the shortcomings posed by other solid-state methods and augurs a good outlook for barocaloric cooling, but there are still many struggles ahead to address in order to demonstrate its viability as a commercial cooling technique. Here we briefly review the milestones achieved in terms of barocaloric materials and discuss the pending challenges and expectations for the oncoming years.

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Section: Discussionmentioning

confidence: 99%

Advances and obstacles in pressure-driven solid-state cooling: A review of barocaloric materials

Lloveras

Tamarit

2021

MRS Energy & Sustainability

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“…temperature, pressure or light irradiation). Even if systems based on Co II , [16][17][18][19][20] Mn and Fe are increasingly being investigated in the last few years thanks to considerable synthetic efforts, those based on the Fe(II) ion (d 6 electronic configuration) are, by far, the most reported systems. However, while SCO complexes are, in their great majority, either cationic or neutral; the few SCO anionic systems reported up today are, to the best of our knowledge, restricted to Fe(III) [27][28][29][30][31][32][33][34][35][36] and Fe(II) [45][46][54][55][56][57][58][59] metal ions.…”

Section: ■ Introductionmentioning

confidence: 99%

“…temperature, pressure, or light irradiation). Even though systems based on Co II , − Mn III , − and Fe III − have been increasingly investigated in the past few years thanks to considerable synthetic efforts, those based on the Fe(II) ion (d 6 electronic configuration) are by far, the most reported systems. − However, while SCO complexes are, for the most part, either cationic or neutral, the few SCO anionic systems reported up today are, to the best of our knowledge, restricted to Fe(III) − and Fe(II) ,,− metal ions. Such anionic complexes are however essential for the design of multifunctional materials such as fluorescent or conducting switchable materials, , since they could allow, through appropriate metathesis syntheses, the possibility of introducing functional cations such as fluorescent cations or tetrathiafulvalene (TTF) derivative electron-donor molecules.…”

Section: Introductionmentioning

confidence: 99%

Spin Crossover and High-Spin State in Fe(II) Anionic Polymorphs Based on Tripodal Ligands

et al. 2021

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Two new mononuclear Fe(II) polymorphs, [(C2H5)4N]2[Fe(py3C-OEt)(NCS)3]2 (1) and [(C2H5)4N][Fe(py3C-OEt)(NCS)3] (2) (py3C-OEt = tris(pyridin-2yl)ethoxymethane) have been synthesized and characterized by single crystal X-ray diffraction, by magnetic and photomagnetic measurements, and by detailed variable temperature infrared spectroscopy. The molecular structure, in both complexes, is composed by the same anionic [Fe(py3C-OEt)(NCS)3] -complex (two units for 1, and one unit for 2) generated by a coordination, to the Fe(II) metal centre, of one tridentate donor molecules such tetrathiafulvalene (TTF) derivatives for the design of multifunctional systems, such as fluorescent or conducting switchable materials. 6,60 ■ ASSOCIATED CONTENT Supporting informationThe Supporting Information is available free of charge on the ACS Publications website at DOI: XXXXX/acs.inorg-chem.XXXXXXX X-ray crystallographic data in CIF format: CCDC numbers 2025933-2025936 (CIF). This material is available free of charge via the Internet at http://pubs.acs.org. Syntheses details and figures S1-S19 (pdf)

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“…The charge transport properties of SCO and reverse SCO have been widely explored for thin film‐based sensors and memory device applications but very rare in liquid [15, 16]. Recently, SCO/reverse SCO‐based material was investigated for TEC applications [17–20]. The HS state is usually a more elongated molecule compared to the LS which is more compressed due to electron‐electron repulsion as described by the Jahn‐Teller distortion and as illustrated in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of spin Seebeck effect of reverse spin crossover Fe (II) micellar charge transport using PMMA polymer electrolyte

Hasnan

Noor

Nayan

et al. 2021

Applied Organom Chemis

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The electrochemical thermoelectric effect is capable of generating Seebeck and conductivity from a temperature gradient through redox reaction at the electrode. Conventional spin Seebeck effect (SSE) is the generation of spin voltage by solid coupling magnetic thin film in presence of magnetic field and temperature gradient. In this study, we demonstrate an enhancement of a magnetic free SSE of Fe (II) reverse spin-crossover in electrolyte using 1% PMMA polymer additive in form of polymer electrolyte. The reverse spin effect of Fe (II) complex, which is confirmed by SQUID magnetometer analysis and DFT simulation, is able to produce magnetic free SSE in solution. A unique

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Molecular design strategies for spin-crossover (SCO) metal complexes (Fe(II) and Co(II)) for thermoelectricity

Cited by 19 publications

References 42 publications

Advances and obstacles in pressure-driven solid-state cooling: A review of barocaloric materials

Advances and obstacles in pressure-driven solid-state cooling: A review of barocaloric materials

Spin Crossover and High-Spin State in Fe(II) Anionic Polymorphs Based on Tripodal Ligands

Enhancement of spin Seebeck effect of reverse spin crossover Fe (II) micellar charge transport using PMMA polymer electrolyte

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