Hybrid Spin-Crossover Conductor Exhibiting Unusual Variable-Temperature Electrical Conductivity

2009 ◽  
Vol 48 (22) ◽  
pp. 10489-10491 ◽  
Author(s):  
Brandon Djukic ◽  
Martin T. Lemaire
Keyword(s):  
Electrical Conductivity ◽  
Spin Crossover ◽  
Variable Temperature

scholarly journals New Spin-Crossover Compounds Containing the [Ni(mnt)] Anion (mnt = Maleonitriledithiolate)

2021 ◽  
Vol 7 (5) ◽  
pp. 72
Author(s):  
Scott S. Turner ◽  
Joanna Daniell ◽  
Hiroki Akutsu ◽  
Peter N. Horton ◽  
Simon J. Coles ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Single Crystal ◽  
Spin Crossover ◽  
Variable Temperature ◽  
X Ray Diffraction ◽  
X Ray ◽  
Counter Ions ◽  
Bulk Magnetization ◽  
L1 And L2 ◽  
Derivatives Of

Two novel salts containing the anion [Ni(mnt)2]− (mnt = maleonitriledithiolate) have been synthesized. The counter-ions, [Fe(II)(L1 or L2)2], are cationic complexes where L1 and L2 are methylated derivatives of 2,6-bis(pyazolyl)pyridine or pyrazine, which are similar to ligands found in a series of spin-crossover (SCO) complexes. Both salts are characterized by variable temperature single crystal X-ray diffraction and bulk magnetization measurements. Compound 1, [Fe(II)(L1)2][Ni(mnt)2]2 displays an incomplete and gradual SCO up to 300 K, followed by a more rapid increase in the high-spin fraction between 300 and 350 K. Compound 2, [Fe(II)(L2)2][Ni(mnt)2]2.MeNO2, shows a gradual, but more complete SCO response centered at 250 K. For compound 2, the SCO is confirmed by variable temperature Mössbauer spectroscopy. In both cases, the anionic moieties are isolated from each other and so no electrical conductivity is observed.

scholarly journals Spin State Behavior of A Spin-Crossover Iron(II) Complex with N,N′-Disubstituted 2,6-bis(pyrazol-3-yl)pyridine: A Combined Study by X-ray Diffraction and NMR Spectroscopy

Crystals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 793
Author(s):  
Elizaveta K. Melnikova ◽  
Dmitry Yu. Aleshin ◽  
Igor A. Nikovskiy ◽  
Gleb L. Denisov ◽  
Yulia V. Nelyubina
Keyword(s):  
Nmr Spectroscopy ◽  
Spin State ◽  
Metal Ion ◽  
Spin Crossover ◽  
Molecular Design ◽  
Chemical Shifts ◽  
Variable Temperature ◽  
High Spin State ◽  
X Ray Diffraction ◽  
X Ray

A series of three different solvatomorphs of a new iron(II) complex with N,N′-disubstituted 2,6-bis(pyrazol-3-yl)pyridine, including those with the same lattice solvent, has been identified by X-ray diffraction under the same crystallization conditions with the metal ion trapped in the different spin states. A thermally induced switching between them, however, occurs in a solution, as unambiguously confirmed by the Evans technique and an analysis of paramagnetic chemical shifts, both based on variable-temperature NMR spectroscopy. The observed stabilization of the high-spin state by an electron-donating substituent contributes to the controversial results for the iron(II) complexes of 2,6-bis(pyrazol-3-yl)pyridines, preventing ‘molecular’ design of their spin-crossover activity; the synthesized complex being only the fourth of the spin-crossover (SCO)-active kind with an N,N′-disubstituted ligand.

scholarly journals Electrical conductivity and magnetic bistability in metal–organic frameworks and coordination polymers: charge transport and spin crossover at the nanoscale

2020 ◽  
Vol 49 (15) ◽  
pp. 5601-5638 ◽  
Author(s):  
Víctor Rubio-Giménez ◽  
Sergio Tatay ◽  
Carlos Martí-Gastaldo
Keyword(s):  
Electrical Conductivity ◽  
Charge Transport ◽  
Coordination Polymers ◽  
Spin Crossover ◽  
Electronic Devices ◽  
Metal Organic Frameworks ◽  
Active Components ◽  
Metal Organic

This review aims to reassess the progress, issues and opportunities in the path towards integrating conductive and magnetically bistable coordination polymers and metal–organic frameworks as active components in electronic devices.

Varied spin crossover behaviour in a family of dinuclear Fe(ii) triple helicate complexes

2018 ◽  
Vol 47 (24) ◽  
pp. 7965-7974 ◽  
Author(s):  
Rosanna J. Archer ◽  
Hayley S. Scott ◽  
Matthew I. J. Polson ◽  
Bryce E. Williamson ◽  
Corine Mathonière ◽  
...  
Keyword(s):  
Spin Crossover ◽  
Variable Temperature ◽  
Triple Helicate

A family of dinuclear Fe(ii) triple helicate complexes has been structurally characterised and their spin crossover behaviour studied using a variety of variable temperature physical techniques.

scholarly journals Solution-State Spin Crossover in a Family of [Fe(L)2(CH3CN)2](BF4)2 Complexes

2019 ◽  
Vol 5 (2) ◽  
pp. 22
Author(s):  
Benjamin Wilson ◽  
Hayley Scott ◽  
Rosanna Archer ◽  
Corine Mathonière ◽  
Rodolphe Clérac ◽  
...  
Keyword(s):  
Thermodynamic Parameters ◽  
General Formula ◽  
Spin Crossover ◽  
Variable Temperature ◽  
Spectroscopic Studies ◽  
Solution State ◽  
Uv Visible ◽  
State Spin

We report herein on five new Fe(II) complexes of general formula [Fe(L)2(NCCH3)2](BF4)2•xCH3CN (L = substituted 2-pyridylimine-based ligands). The influence of proximally located electron withdrawing groups (e.g., NO2, CN, CF3, Cl, Br) bound to coordinated pyridylimine ligands has been studied for the effect on spin crossover in their Fe(II) complexes. Variable-temperature UV-visible spectroscopic studies performed on complexes with more strongly electronegative ligand substituents revealed spin crossover (SCO) in the solution, and thermodynamic parameters associated with the spin crossover were estimated.

scholarly journals Synthesis and variable temperature electrical conductivity studies of highly ordered TiO2 nanotubes

2009 ◽  
Vol 44 (17) ◽  
pp. 4613-4616 ◽  
Author(s):  
Ramazan Asmatulu ◽  
Annamalai Karthikeyan ◽  
David C. Bell ◽  
Shriram Ramanathan ◽  
Michael J. Aziz
Keyword(s):  
Electrical Conductivity ◽  
Tio2 Nanotubes ◽  
Variable Temperature

A Known Iron(II) Complex in Different Nanosized Particles: Variable-Temperature Raman Study of Its Spin-Crossover Behavior

2019 ◽  
Vol 58 (8) ◽  
pp. 5183-5195 ◽  
Author(s):  
Zoi G. Lada ◽  
Konstantinos S. Andrikopoulos ◽  
Athanassios Chrissanthopoulos ◽  
Spyros P. Perlepes ◽  
George A. Voyiatzis
Keyword(s):  
Spin Crossover ◽  
Variable Temperature ◽  
Nanosized Particles ◽  
Crossover Behavior ◽  
Raman Study

Evidence of the Chemical Uniaxial Strain Effect on Electrical Conductivity in the Spin-Crossover Conducting Molecular System: [FeIII(qnal)2][Pd(dmit)2]5·Acetone

2008 ◽  
Vol 130 (21) ◽  
pp. 6688-6689 ◽  
Author(s):  
Kazuyuki Takahashi ◽  
Heng-Bo Cui ◽  
Yoshinori Okano ◽  
Hayao Kobayashi ◽  
Hatsumi Mori ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Spin Crossover ◽  
Molecular System ◽  
Uniaxial Strain ◽  
Strain Effect
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