The origin of the second relaxation process in the [Mn12O12(O2CR)16(H2O)4] single-molecule magnets: ‘Jahn–Teller isomerism’ in the [Mn12O12] core

1999 ◽  
pp. 1973-1974 ◽  
Author(s):  
Ziming Sun ◽  
Daniel Ruiz ◽  
David N. Hendrickson ◽  
Neil R. Dilley ◽  
M. Brian Maple ◽  
...  
Keyword(s):  
Relaxation Process ◽  
Single Molecule ◽  
Single Molecule Magnets ◽  
Jahn Teller

scholarly journals Vibrational Coherences in Manganese Single-molecule Magnets after Ultrafast Photoexcitation

2018 ◽  
Author(s):  
Florian Liedy ◽  
Robbie McNab ◽  
Julien Eng ◽  
Ross Inglis ◽  
Thomas Penfold ◽  
...  
Keyword(s):  
Data Storage ◽  
Single Molecule ◽  
Optical Data Storage ◽  
Transient Absorption Spectroscopy ◽  
Optical Data ◽  
Zero Field ◽  
Zero Field Splitting ◽  
Single Molecule Magnets ◽  
Teller Distortion ◽  
Jahn Teller

<p>Single-Molecule Magnets (SMMs) are metal complexes with two degenerate magnetic ground states arising from a non-zero spin ground state and a zero-field splitting. SMMs are promising for future applications in data storage, however, to date the ability to manipulate the spins using optical stimulus is lacking. Here, we have explored the ultrafast dynamics occurring after photoexcitation of two structurally related Mn(III)-based SMMs, whose magnetic anisotropy is closely related to the Jahn-Teller distortion, and demonstrate coherent modulation of the axial anisotropy on a femtosecond timescale. Ultrafast transient absorption spectroscopy in solution reveals oscillations superimposed on the decay traces with corresponding energies around 200 cm<sup>−1</sup>, coinciding with a vibrational mode along the Jahn-Teller axis. Our results provide a non-thermal, coherent mechanism to dynamically control the magnetisation in SMMs and open up new molecular design challenges to enhance the change in anisotropy in the excited state, which is essential for future ultrafast magneto-optical data storage devices.</p>

Dramatic impact of auxiliary ligands on the two-step magnetic relaxation process in Dy4(iii) single-molecule magnets

2019 ◽  
Vol 48 (17) ◽  
pp. 5793-5799 ◽  
Author(s):  
Kun Zhang ◽  
Gao-Peng Li ◽  
Cheng Zhang ◽  
Yao-Yu Wang
Keyword(s):  
Relaxation Process ◽  
Single Molecule ◽  
Magnetic Relaxation ◽  
Relaxation Processes ◽  
Single Molecule Magnets ◽  
Coordination Sites

Two-step relaxation processes are modulated in two Dy(iii)4 SMMs through modifying the auxiliary ligands on the changeable coordination sites.

Mixed valency in polynuclear Mn II /Mn III , Mn III /Mn IV and Mn II /Mn III /Mn IV clusters: a foundation for high-spin molecules and single-molecule magnets

2007 ◽  
Vol 366 (1862) ◽  
pp. 113-125 ◽  
Author(s):  
Theocharis C Stamatatos ◽  
George Christou
Keyword(s):  
Single Molecule ◽  
Exchange Interactions ◽  
Zero Field ◽  
Zero Field Splitting ◽  
Single Molecule Magnets ◽  
Zero Field Splitting Parameter ◽  
Jahn Teller ◽  
Splitting Parameter ◽  
Molecular Spin ◽  
Molecular Compounds

Mixed-valent Mn/O dinuclear and polynuclear molecular compounds containing Mn III are almost without exception trapped valence. Large differences between the strengths of the exchange interactions within Mn II Mn III , Mn III Mn III and Mn III Mn IV pairs lead to situations where Mn III Mn IV interactions, the strongest of the three mentioned and antiferromagnetic in nature, dominate the intramolecular spin alignments in trinuclear and higher nuclearity mixed-valent complexes and often result in molecules that have large, and sometimes abnormally large, values of molecular spin ( S ). When coupled to a large molecular magnetoanisotropy of the easy-axis-type (negative zero-field splitting parameter, D ), also primarily resulting from individual Jahn–Teller distorted Mn III centres, such molecules will function as single-molecule magnets (molecular nanomagnets). Dissection of the structures and exchange interactions within a variety of mixed-valent Mn x cluster molecules with metal nuclearities of Mn 4 , Mn 12 and Mn 25 allows a ready rationalization of the observed S , D and overall magnetic properties in terms of competing antiferromagnetic exchange interactions within triangular subunits, resulting spin alignments and relative orientation of Mn III JT axes. Such an understanding has provided a stepping stone to the identification of a ‘magnetically soft’ Mn 25 cluster whose groundstate spin S value can be significantly altered by relatively minor structural perturbations. Such ‘spin tweaking’ has allowed this cluster to be obtained in three different forms with three different groundstate S values.

Single-molecule magnets: control by a single solvent molecule of Jahn–Teller isomerism in [Mn12O12(O2CCH2But)16(H2O)4]

2003 ◽  
pp. 2672-2673 ◽  
Author(s):  
Mònica Soler ◽  
Wolfgang Wernsdorfer ◽  
Ziming Sun ◽  
John C. Huffman ◽  
David N. Hendrickson ◽  
...  
Keyword(s):  
Single Molecule ◽  
Solvent Molecule ◽  
Single Molecule Magnets ◽  
Jahn Teller

scholarly journals Single-molecule magnets: Jahn–Teller isomerism and the origin of two magnetization relaxation processes in Mn12 complexes

Polyhedron ◽  
2001 ◽  
Vol 20 (11-14) ◽  
pp. 1139-1145 ◽  
Author(s):  
Sheila M.J Aubin ◽  
Ziming Sun ◽  
Hilary J Eppley ◽  
Evan M Rumberger ◽  
Ilia A Guzei ◽  
...  
Keyword(s):  
Single Molecule ◽  
Relaxation Processes ◽  
Single Molecule Magnets ◽  
Magnetization Relaxation ◽  
Jahn Teller

scholarly journals Trigonal antiprismatic Co(ii) single molecule magnets with large uniaxial anisotropies: importance of Raman and tunneling mechanisms

2016 ◽  
Vol 7 (10) ◽  
pp. 6519-6527 ◽  
Author(s):  
Yuan-Zhu Zhang ◽  
Silvia Gómez-Coca ◽  
Andrew J. Brown ◽  
Mohamed R. Saber ◽  
Xuan Zhang ◽  
...  
Keyword(s):  
Relaxation Process ◽  
Single Molecule ◽  
Single Molecule Magnets

A trigonal antiprismatic Co(ii) molecule exhibits counterion-dependent relaxation of the magnetization due to the importance of the Raman relaxation process.

Counter anions influence the relaxation dynamics of phenoxy-bridged Dy2 single molecule magnets

2020 ◽  
Vol 49 (35) ◽  
pp. 12372-12379 ◽  
Author(s):  
Shuting Liu ◽  
Jingjing Lu ◽  
Xiao-Lei Li ◽  
Zhenhua Zhu ◽  
Jinkui Tang
Keyword(s):  
Relaxation Process ◽  
Single Molecule ◽  
Relaxation Dynamics ◽  
Counter Anion ◽  
Dynamic Relaxation ◽  
Single Molecule Magnets

Structural and magnetic investigations into four dinuclear dysprosium complexes reveal that the counter anion influences the dynamic relaxation process in these complexes.

scholarly journals Vibrational Coherences in Manganese Single-molecule Magnets after Ultrafast Photoexcitation

2018 ◽  
Author(s):  
Florian Liedy ◽  
Robbie McNab ◽  
Julien Eng ◽  
Ross Inglis ◽  
Thomas Penfold ◽  
...  
Keyword(s):  
Data Storage ◽  
Single Molecule ◽  
Optical Data Storage ◽  
Transient Absorption Spectroscopy ◽  
Optical Data ◽  
Zero Field ◽  
Zero Field Splitting ◽  
Single Molecule Magnets ◽  
Teller Distortion ◽  
Jahn Teller

<p>Single-Molecule Magnets (SMMs) are metal complexes with two degenerate magnetic ground states arising from a non-zero spin ground state and a zero-field splitting. SMMs are promising for future applications in data storage, however, to date the ability to manipulate the spins using optical stimulus is lacking. Here, we have explored the ultrafast dynamics occurring after photoexcitation of two structurally related Mn(III)-based SMMs, whose magnetic anisotropy is closely related to the Jahn-Teller distortion, and demonstrate coherent modulation of the axial anisotropy on a femtosecond timescale. Ultrafast transient absorption spectroscopy in solution reveals oscillations superimposed on the decay traces with corresponding energies around 200 cm<sup>−1</sup>, coinciding with a vibrational mode along the Jahn-Teller axis. Our results provide a non-thermal, coherent mechanism to dynamically control the magnetisation in SMMs and open up new molecular design challenges to enhance the change in anisotropy in the excited state, which is essential for future ultrafast magneto-optical data storage devices.</p>

scholarly journals Single-Molecule Magnets:  Ligand-Induced Core Distortion and Multiple Jahn−Teller Isomerism in [Mn12O12(O2CMe)8(O2PPh2)8(H2O)4]

2001 ◽  
Vol 123 (40) ◽  
pp. 9914-9915 ◽  
Author(s):  
Colette Boskovic ◽  
Maren Pink ◽  
John C. Huffman ◽  
David N. Hendrickson ◽  
George Christou
Keyword(s):  
Single Molecule ◽  
Single Molecule Magnets ◽  
Jahn Teller
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