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Flinn B, Rance GA, Cull WJ, Cardillo-Zallo I, Pitcairn J, Cliffe MJ, Fay MW, Tyler AJ, Weare BL, Stoppiello CT, Davies ES, Mather ML, Khlobystov AN. Sensing the Spin State of Room-Temperature Switchable Cyanometallate Frameworks with Nitrogen-Vacancy Centers in Nanodiamonds. ACS NANO 2024; 18:7148-7160. [PMID: 38383159 PMCID: PMC10919078 DOI: 10.1021/acsnano.3c11820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2023] [Revised: 02/05/2024] [Accepted: 02/08/2024] [Indexed: 02/23/2024]
Abstract
Room-temperature magnetically switchable materials play a vital role in current and upcoming quantum technologies, such as spintronics, molecular switches, and data storage devices. The increasing miniaturization of device architectures produces a need to develop analytical tools capable of precisely probing spin information at the single-particle level. In this work, we demonstrate a methodology using negatively charged nitrogen vacancies (NV-) in fluorescent nanodiamond (FND) particles to probe the magnetic switching of a spin crossover (SCO) metal-organic framework (MOF), [Fe(1,6-naphthyridine)2(Ag(CN)2)2] material (1), and a single-molecule photomagnet [X(18-crown-6)(H2O)3]Fe(CN)6·2H2O, where X = Eu and Dy (materials 2a and 2b, respectively), in response to heat, light, and electron beam exposure. We employ correlative light-electron microscopy using transmission electron microscopy (TEM) finder grids to accurately image and sense spin-spin interacting particles down to the single-particle level. We used surface-sensitive optically detected magnetic resonance (ODMR) and magnetic modulation (MM) of FND photoluminescence (PL) to sense spins to a distance of ca. 10-30 nm. We show that ODMR and MM sensing was not sensitive to the temperature-induced SCO of FeII in 1 as formation of paramagnetic FeIII through surface oxidation (detected by X-ray photoelectron spectroscopy) on heating obscured the signal of bulk SCO switching. We found that proximal FNDs could effectively sense the chemical transformations induced by the 200 keV electron beam in 1, namely, AgI → Ag0 and FeII → FeIII. However, transformations induced by the electron beam are irreversible as they substantially disrupt the structure of MOF particles. Finally, we demonstrate NV- sensing of reversible photomagnetic switching, FeIII + (18-crown-6) ⇆ FeII + (18-crown-6)+ •, triggered in 2a and 2b by 405 nm light. The photoredox process of 2a and 2b proved to be the best candidate for room-temperature single-particle magnetic switching utilizing FNDs as a sensor, which could have applications into next-generation quantum technologies.
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Affiliation(s)
- Bradley
T. Flinn
- School
of Chemistry, University of Nottingham, Nottingham, NG7 2RD, United Kingdom
| | - Graham A. Rance
- Nanoscale
and Microscale Research Centre, University
of Nottingham, Nottingham, NG7 2RD, United
Kingdom
| | - William J. Cull
- School
of Chemistry, University of Nottingham, Nottingham, NG7 2RD, United Kingdom
| | - Ian Cardillo-Zallo
- School
of Chemistry, University of Nottingham, Nottingham, NG7 2RD, United Kingdom
| | - Jem Pitcairn
- School
of Chemistry, University of Nottingham, Nottingham, NG7 2RD, United Kingdom
- School
of Chemistry, University of Birmingham, Birmingham, B15 2TT, United Kingdom
| | - Matthew J. Cliffe
- School
of Chemistry, University of Nottingham, Nottingham, NG7 2RD, United Kingdom
| | - Michael W. Fay
- Nanoscale
and Microscale Research Centre, University
of Nottingham, Nottingham, NG7 2RD, United
Kingdom
| | - Ashley J. Tyler
- Optics
and Photonics Group, Faculty of Engineering, University of Nottingham, Nottingham, NG7 2RD, United
Kingdom
| | - Benjamin L. Weare
- Nanoscale
and Microscale Research Centre, University
of Nottingham, Nottingham, NG7 2RD, United
Kingdom
| | - Craig T. Stoppiello
- Centre
for Microscopy and Microanalysis, University
of Queensland, St. Lucia, 4072, Australia
| | - E. Stephen Davies
- School
of Chemistry, University of Nottingham, Nottingham, NG7 2RD, United Kingdom
| | - Melissa L. Mather
- Optics
and Photonics Group, Faculty of Engineering, University of Nottingham, Nottingham, NG7 2RD, United
Kingdom
| | - Andrei N. Khlobystov
- School
of Chemistry, University of Nottingham, Nottingham, NG7 2RD, United Kingdom
- Nanoscale
and Microscale Research Centre, University
of Nottingham, Nottingham, NG7 2RD, United
Kingdom
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Martínez Serra A, Dhingra A, Asensio MC, Real JA, Francisco Sánchez Royo J. Is the surface of Hofmann-like spin-crossover {Fe(pz)[Pt(CN) 4]} the same as its bulk? Dalton Trans 2023; 52:10305-10309. [PMID: 37469273 DOI: 10.1039/d3dt01955a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/21/2023]
Abstract
Temperature dependent X-ray photoemission spectroscopy (XPS) has been employed to examine the spin-crossover (SCO) transition in the nanocrystals of 3D Hoffman-like {Fe(pz)[Pt(CN)4]}. Consistent with the existing literature, the temperature-dependent variations in the Fe 2p core-level spectrum provide unambiguous evidence of the spin-state transition in this SCO complex. One of the many possible reasons behind a lack of discernible temperature-driven shifts in the binding energies of both the N 1s core-level components could be the immunity of its HS electronic configuration to thermal fluctuations. The high-spin fraction versus temperature plot, extrapolated from the XPS measurements, reveals that the surface of the nanocrystals of {Fe(pz)[Pt(CN)4]} is in the high-spin state at room temperature, rendering it promising for room-temperature spintronics and quantum information science applications.
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Affiliation(s)
- Alejandro Martínez Serra
- Institut de Ciència dels Materials de la Universitat de València (ICMUV), University of Valencia, Carrer del Catedrátic José Beltrán Martinez, 2, 46980 Paterna, Valencia, Spain.
| | - Archit Dhingra
- Institut de Ciència dels Materials de la Universitat de València (ICMUV), University of Valencia, Carrer del Catedrátic José Beltrán Martinez, 2, 46980 Paterna, Valencia, Spain.
| | - María Carmen Asensio
- Materials Science Institute of Madrid (ICMM/CSIC), Cantoblanco, E-28049 Madrid, Spain
- MATINÉE, the CSIC Associated Unit between the Materials Science Institute (ICMUV) and the ICMM, Cantoblanco, E-28049 Madrid, Spain
| | - José Antonio Real
- Institut de Ciència Molecular (ICMol), University of Valencia, Carrer del Catedrátic José Beltrán Martinez, 2, 46980 Paterna, Valencia, Spain
| | - Juan Francisco Sánchez Royo
- Institut de Ciència dels Materials de la Universitat de València (ICMUV), University of Valencia, Carrer del Catedrátic José Beltrán Martinez, 2, 46980 Paterna, Valencia, Spain.
- MATINÉE, the CSIC Associated Unit between the Materials Science Institute (ICMUV) and the ICMM, Cantoblanco, E-28049 Madrid, Spain
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Tang Z, Wen J, Zhuang GL, Wei RJ, Sun XP, Yao ZS, Tao J. Magnetic and Dielectric Switchings Actuated by the Rotation of the Picoline Ligand in an Iron-Based Dinuclear Phase-Transition Complex. Inorg Chem 2023; 62:266-274. [PMID: 36548144 DOI: 10.1021/acs.inorgchem.2c03364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Multifunctional materials with switchable magnetic and dielectric properties are crucial for the development of memory and sensor devices. Herein, we report a methoxy-bridged dinuclear iron-pyridyl complex [Fe2(4-picoline)4(NCS)4(μ-OCH3)2] (1), which shows simultaneous thermal-induced magnetic and dielectric switchings. Within the phase-transition temperature range, both magnetic switching and the dielectric anomaly were detected, in which the thermal hysteresis loops were 23 and 21 K, respectively. Detailed structural analyses revealed that these simultaneous switchings were rooted in the flexible rotatable ligands, which were actuated by readjusting the π-π intermolecular interactions between the pyridine ligands in the trans positions of the metal centers. These results were comprehensively investigated both experimentally and theoretically. This study presents a new guideline to control both the magnetic and dielectric properties of molecular complexes by external stimuli.
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Affiliation(s)
- Zheng Tang
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Liangxiang Campus, Beijing 102488, China
| | - Jun Wen
- Institute of Industrial Catalysis, College of Chemical Engineering, Zhejiang University of Technology, Zhejiang 310023, China
| | - Gui-Lin Zhuang
- Institute of Industrial Catalysis, College of Chemical Engineering, Zhejiang University of Technology, Zhejiang 310023, China
| | - Rong-Jia Wei
- College of Chemistry and Materials Science, and Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications, Jinan University, Guangzhou 510632, China
| | - Xiao-Peng Sun
- Henan Key Laboratory of Polyoxometalate Chemistry, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China
| | - Zi-Shuo Yao
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Liangxiang Campus, Beijing 102488, China
| | - Jun Tao
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Liangxiang Campus, Beijing 102488, China
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