Spin-Crossover Iron(II) Coordination Polymer with Fluorescent Properties: Correlation between Emission Properties and Spin State

2018 ◽  
Vol 140 (2) ◽  
pp. 700-709 ◽  
Author(s):  
Charles Lochenie ◽  
Konstantin Schötz ◽  
Fabian Panzer ◽  
Hannah Kurz ◽  
Bernadette Maier ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Spin State ◽  
Spin Crossover ◽  
Fluorescent Properties ◽  
Emission Properties

scholarly journals Probing the unpaired Fe spins across the spin crossover of a coordination polymer

2021 ◽  
Author(s):  
Thilini K. Ekanayaka ◽  
Hannah Kurz ◽  
Ashley S. Dale ◽  
Guanhua Hao ◽  
Aaron Mosey ◽  
...  
Keyword(s):  
Schiff Base ◽  
Coordination Polymer ◽  
Spin State ◽  
Spin Crossover ◽  
State Transition ◽  
Spin State Transition

For the spin crossover coordination polymer [Fe(L1)(bipy)]n (where L1 is a N2O22− coordinating Schiff base-like ligand bearing a phenazine fluorophore and bipy = 4,4′-bipyridine), there is compelling additional evidence of a spin state transition.

scholarly journals Light- and Temperature-Assisted Spin State Annealing: Accessing the Hidden Multistability

2019 ◽  
Author(s):  
Yan-Cong Chen ◽  
Yan Meng ◽  
Jiří Tuček ◽  
Yan-Jie Dong ◽  
Xiao-Wei Song ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Spin State ◽  
Spin Crossover ◽  
Spectral Investigation ◽  
Spin States ◽  
Medium Temperature ◽  
Transition Pathways ◽  
Intelligent Devices ◽  
Thermodynamic Effects ◽  
Temperature Stimulation

Among the responsive multistable materials, spin crossover (SCO) systems are of particular interest for stabilizing multiple spin states with various stimulus inputs and physical outputs. Here in a 2D Hofmann-type coordination polymer [Fe(isoq)<sub>2</sub>{Au(CN)<sub>2</sub>}<sub>2</sub>] (isoq = isoquinoline), hidden multistability of the spin state is accessed by introducing an medium-temperature annealing after a light/temperature stimulation. With the combined effort of magnetic, crystallographic and Mössbauer spectral investigation, these distinct spin states are identified and the light- and temperature-assisted transition pathways are clarified. Such excitation-relaxation and trapping-relaxation joint mechanisms, as ingenious interplays between the kinetic and thermodynamic effects, uncover hidden possibilities for the discovery of multistable materials and the development of multistate intelligent devices.

scholarly journals Thermo- and photo-modulation of exciplex fluorescence in a 3D spin crossover Hofmann-type coordination polymer

2018 ◽  
Vol 9 (44) ◽  
pp. 8446-8452 ◽  
Author(s):  
Teresa Delgado ◽  
Manuel Meneses-Sánchez ◽  
Lucía Piñeiro-López ◽  
Carlos Bartual-Murgui ◽  
M. Carmen Muñoz ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Spin State ◽  
Spin Crossover ◽  
Analytical Tool ◽  
Type Material ◽  
Exciplex Luminescence ◽  
Exciplex Fluorescence

Inclusion of pyrene in the pores of a 3D iron(ii) spin-crossover Hofmann-type material allows thermal and light-induced ON–OFF switching of the resulting exciplex luminescence and provides an analytical tool to control the spin-state of the iron(ii) nodes.

scholarly journals Competing Phases Involving Spin-State and Ligand Structural Orderings in a Multistable Two-Dimensional Spin Crossover Coordination Polymer

2017 ◽  
Vol 17 (5) ◽  
pp. 2736-2745 ◽  
Author(s):  
Daopeng Zhang ◽  
Elzbieta Trzop ◽  
Francisco J. Valverde-Muñoz ◽  
Lucía Piñeiro-López ◽  
M. Carmen Muñoz ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Spin State ◽  
Spin Crossover ◽  
Two Dimensional

Evidence for surface effects on the intermolecular interactions in Fe(ii) spin crossover coordination polymers

2022 ◽  
Author(s):  
Thilini K. Ekanayaka ◽  
Hannah Kurz ◽  
Kayleigh A. McElveen ◽  
Guanhua Hao ◽  
Esha Mishra ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Intermolecular Interactions ◽  
Spin State ◽  
Coordination Polymers ◽  
Spin Crossover ◽  
State Transition ◽  
Photoemission Spectroscopy ◽  
X Ray ◽  
Spin State Transition ◽  
X Ray Absorption

From X-ray absorption spectroscopy (XAS) and X-ray photoemission spectroscopy (XPS) it is evident that the spin state transition behavior of Fe(ii) spin crossover coordination polymer crystallites at the surface differs from the bulk.

scholarly journals Light- and temperature-assisted spin state annealing: accessing the hidden multistability

2020 ◽  
Vol 11 (12) ◽  
pp. 3281-3289 ◽  
Author(s):  
Yan-Cong Chen ◽  
Yan Meng ◽  
Yan-Jie Dong ◽  
Xiao-Wei Song ◽  
Guo-Zhang Huang ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Spin State ◽  
Spin Crossover ◽  
Spin States ◽  
Two Stage

Two new two-stage manipulation protocols, namely light- and temperature-assisted spin state annealing (LASSA/TASSA), are applied to a spin crossover coordination polymer, [Fe(isoq)2{Au(CN)2}2], revealing the hidden multistability of spin states.

scholarly journals Light- and Temperature-Assisted Spin State Annealing: Accessing the Hidden Multistability

2019 ◽  
Author(s):  
Yan-Cong Chen ◽  
Yan Meng ◽  
Jiří Tuček ◽  
Yan-Jie Dong ◽  
Xiao-Wei Song ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Spin State ◽  
Spin Crossover ◽  
Spectral Investigation ◽  
Spin States ◽  
Medium Temperature ◽  
Transition Pathways ◽  
Intelligent Devices ◽  
Thermodynamic Effects ◽  
Temperature Stimulation

Among the responsive multistable materials, spin crossover (SCO) systems are of particular interest for stabilizing multiple spin states with various stimulus inputs and physical outputs. Here in a 2D Hofmann-type coordination polymer [Fe(isoq)<sub>2</sub>{Au(CN)<sub>2</sub>}<sub>2</sub>] (isoq = isoquinoline), hidden multistability of the spin state is accessed by introducing an medium-temperature annealing after a light/temperature stimulation. With the combined effort of magnetic, crystallographic and Mössbauer spectral investigation, these distinct spin states are identified and the light- and temperature-assisted transition pathways are clarified. Such excitation-relaxation and trapping-relaxation joint mechanisms, as ingenious interplays between the kinetic and thermodynamic effects, uncover hidden possibilities for the discovery of multistable materials and the development of multistate intelligent devices.

Influence of ligand substituent conformation on the spin state of an iron(ii)/di(pyrazol-1-yl)pyridine complex

2021 ◽  
Vol 50 (10) ◽  
pp. 3464-3467
Author(s):  
Rafal Kulmaczewski ◽  
Mark J. Howard ◽  
Malcolm A. Halcrow
Keyword(s):  
Spin State ◽  
Spin Crossover ◽  
Solution Phase ◽  
Pyridine Complex

The temperature of the solution-phase spin-crossover equilibrium in iron(ii) complexes of 4-alkylsulfanyl-2,6-di{pyrazol-1-yl}pyridine (bppSR) complexes depends strongly on the alkylsulfanyl substituent.

scholarly journals Spin-state-dependent electrical conductivity in single-walled carbon nanotubes encapsulating spin-crossover molecules

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Julia Villalva ◽  
Aysegul Develioglu ◽  
Nicolas Montenegro-Pohlhammer ◽  
Rocío Sánchez-de-Armas ◽  
Arturo Gamonal ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Spin State ◽  
Spin Crossover ◽  
Single Walled Carbon Nanotubes ◽  
Guest Molecules ◽  
Spintronic Devices ◽  
Single Walled Carbon ◽  
State Dependent ◽  
Lack Of Control ◽  
Walled Carbon Nanotubes

AbstractSpin crossover (SCO) molecules are promising nanoscale magnetic switches due to their ability to modify their spin state under several stimuli. However, SCO systems face several bottlenecks when downscaling into nanoscale spintronic devices: their instability at the nanoscale, their insulating character and the lack of control when positioning nanocrystals in nanodevices. Here we show the encapsulation of robust Fe-based SCO molecules within the 1D cavities of single-walled carbon nanotubes (SWCNT). We find that the SCO mechanism endures encapsulation and positioning of individual heterostructures in nanoscale transistors. The SCO switch in the guest molecules triggers a large conductance bistability through the host SWCNT. Moreover, the SCO transition shifts to higher temperatures and displays hysteresis cycles, and thus memory effect, not present in crystalline samples. Our results demonstrate how encapsulation in SWCNTs provides the backbone for the readout and positioning of SCO molecules into nanodevices, and can also help to tune their magnetic properties at the nanoscale.

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