scholarly journals Influence of CF 3 Substituents on the Spin Crossover Behavior of Iron(II) Coordination Polymers with Schiff Base‐like Ligands

2020 ◽  
Vol 646 (13) ◽  
pp. 800-807
Author(s):  
Hannah Kurz ◽  
Joan Sander ◽  
Birgit Weber
Keyword(s):  
Schiff Base ◽  
Coordination Polymers ◽  
Spin Crossover ◽  
Crossover Behavior

Extrinsic vs. intrinsic luminescence and their interplay with spin crossover in 3D Hofmann-type coordination polymers

2020 ◽  
Vol 8 (5) ◽  
pp. 1623-1633 ◽  
Author(s):  
Manuel Meneses-Sánchez ◽  
Lucía Piñeiro-López ◽  
Teresa Delgado ◽  
Carlos Bartual-Murgui ◽  
M. Carmen Muñoz ◽  
...  
Keyword(s):  
Coordination Polymers ◽  
Spin Crossover ◽  
Intrinsic Luminescence ◽  
Crossover Behavior ◽  
Insight Into

Two series of coordination polymers have been synthesized to exhibit extrinsic or intrinsic luminescence modulated by spin crossover behavior. This study provides further insight into the features governing the synergy between both properties.

scholarly journals Two-dimensional square-grid iron(ii) coordination polymers showing anion-dependent spin crossover behavior

RSC Advances ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 5040-5049 ◽  
Author(s):  
Jong Won Shin ◽  
Ah Rim Jeong ◽  
Jong Hwa Jeong ◽  
Hikaru Zenno ◽  
Shinya Hayami ◽  
...  
Keyword(s):  
Coordination Polymers ◽  
Self Assembly ◽  
Spin Crossover ◽  
Two Dimensional ◽  
Square Grid ◽  
Counter Ions ◽  
Crossover Behavior

Two-dimensional Fe-based coordination polymers with square-grid shapes were prepared by self-assembly and exhibited an interesting spin crossover behavior depending on the coordinated counter ions.

scholarly journals Spin-crossover iron(II) coordination polymers with tetradentate Schiff-base ligands

2020 ◽  
Vol 50 (11) ◽  
pp. 1737-1744
Author(s):  
Jian Su ◽  
Jing-Lin Zuo ◽  
Jia-Qian Li ◽  
Ya-Ru Qiu ◽  
Jing-Yuan Ge
Keyword(s):  
Schiff Base ◽  
Coordination Polymers ◽  
Spin Crossover ◽  
Schiff Base Ligands ◽  
Tetradentate Schiff Base

Spin crossover behavior in a family of iron(ii) zigzag chain coordination polymers

2007 ◽  
pp. 934-942 ◽  
Author(s):  
Galina S. Matouzenko ◽  
Monique Perrin ◽  
Boris Le Guennic ◽  
Caroline Genre ◽  
Gábor Molnár ◽  
...  
Keyword(s):  
Coordination Polymers ◽  
Spin Crossover ◽  
Zigzag Chain ◽  
Crossover Behavior

scholarly journals Iron(II) Spin Crossover Polymers of Planar N2O2 Schiff Base Templates and 4,4’-bis(pyridyl)urea Bridges

2019 ◽  
Vol 6 (1) ◽  
pp. 10-18 ◽  
Author(s):  
Lisa Zappe ◽  
Charles Lochenie ◽  
Thomas Martin ◽  
Birgit Weber
Keyword(s):  
Schiff Base ◽  
Spin Crossover ◽  
Thermal Hysteresis ◽  
Crystal Packing ◽  
Magnetic Measurements ◽  
Hysteresis Loops ◽  
Complete Removal ◽  
Axial Ligand ◽  
Trinuclear Complex ◽  
Crossover Behavior

Introduction:The synthesis of four new iron(II) coordination polymers [Fe(L1a)(bpua)] (1), [Fe(L1b)(bpua)](0.5bpua) (2), [Fe(L2a)(bpua)] (3), [Fe(L1b)(bpua)](yEtOH) (5) and one trinuclear complex [{Fe(L1a)(bpua)(MeOH)}2-µ{Fe(L1a)}](xMeOH) (4) with Schiff base-like N2O2coordinating equatorial ligands (L1a, L1b and L2a) and 4,4’-bis(pyridyl)urea (bpua) as bridging axial ligand is described.Materials and Methods:Single crystal X-ray structure elucidation of the trinuclear module4and of the coordination polymer5reveals the presence of HS-LS-HS chains and all-HS infinite 1-D strands, respectively. As anticipated the presence of the bridging urea supports the supramolecular concatenation within an extended hydrogen-bonding network. Magnetic measurements reveal spin crossover behavior for four of the five complexes (1–4) that is strongly solvent dependent.Results and Conclusion:Interestingly, in two cases, complete removal of the solvent from the crystal packing leads to wider thermal hysteresis loops.

Iron(ii) spin crossover complexes with diaminonaphthalene-based Schiff base-like ligands: 1D coordination polymers

2016 ◽  
Vol 40 (5) ◽  
pp. 4687-4695 ◽  
Author(s):  
Charles Lochenie ◽  
Andreas Gebauer ◽  
Ottokar Klimm ◽  
Florian Puchtler ◽  
Birgit Weber
Keyword(s):  
Schiff Base ◽  
Structural Properties ◽  
Coordination Polymers ◽  
Spin Crossover ◽  
Hysteresis Loops ◽  
Bridging Ligands ◽  
Wide Hysteresis ◽  
Spin Crossover Complexes

Iron(ii) spin crossover coordination polymers with diaminonaphthalene derived Schiff base-like ligands were synthesised, and their magnetic and structural properties were analysed. Rigid bridging ligands having up to 40 K wide hysteresis loops were observed.

scholarly journals Iron(II) Spin Crossover Coordination Polymers Derived From a Redox Active Equatorial Tetrathiafulvalene Schiff-Base Ligand

2021 ◽  
Vol 9 ◽  
Author(s):  
Ya-Ru Qiu ◽  
Long Cui ◽  
Jing-Yuan Ge ◽  
Mohamedally Kurmoo ◽  
Guijun Ma ◽  
...  
Keyword(s):  
Schiff Base ◽  
Coordination Polymers ◽  
Fluorescence Intensity ◽  
Schiff Base Ligand ◽  
Layered Structure ◽  
Spin Crossover ◽  
Spin Transition ◽  
Redox Activity ◽  
Transition Behavior ◽  
Redox Active

Two polymorphic FeII coordination polymers [FeIIL (TPPE)0.5] 1) and [(FeII3L3 (TPPE)1.5)] 2), were obtained from a redox-active tetrathiafulvalene (TTF) functionalized ligand [H2L = 2,2’-(((2-(4,5-bis-(methylthio)-1,3-dithiol-2-ylidene)benzo(d) (1,3) dithiole-5,6-diyl)bis-(azanediyl))bis-(meth anylylidene)) (2E,2E')-bis(3-oxobutanoate)] and a highly luminescent connector {TPPE = 1,1,2,2-tetrakis[4-(pyridine-4-yl)phenyl]-ethene}. Complex 1 has a layered structure where the TPPE uses its four diverging pyridines from the TPPE ligand are coordinated by the trans positions to the flat TTF Schiff-base ligand, and complex 2 has an unprecedented catenation of layers within two interpenetrated frameworks. These coordination polymers reserved the redox activity of the TTF unit. Complex 1 shows gradual spin transition behavior without hysteresis. And the fluorescence intensity of TPPE in 1 changes in tandem with the spin crossover (SCO) transition indicating a possible interplay between fluorescence and SCO behavior.

scholarly journals Iron(II) Spin Crossover Complexes with 4,4′-Dipyridylethyne—Crystal Structures and Spin Crossover with Hysteresis

Molecules ◽  
2020 ◽  
Vol 25 (3) ◽  
pp. 581 ◽  
Author(s):  
Katja Dankhoff ◽  
Charles Lochenie ◽  
Birgit Weber
Keyword(s):  
Coordination Polymers ◽  
Spin Crossover ◽  
Thermal Hysteresis ◽  
Hysteresis Loops ◽  
Structure Property ◽  
Crossover Behavior ◽  
Structure Property Relationship ◽  
Wide Hysteresis ◽  
Xrd Patterns ◽  
Relationship Of

Three new iron(II) 1D coordination polymers with cooperative spin crossover behavior showing thermal hysteresis loops were synthesized using N2O2 Schiff base-like equatorial ligands and 4,4′-dipyridylethyne as a bridging, rigid axial linker. One of those iron(II) 1D coordination polymers showed a 73 K wide hysteresis below room temperature, which, upon solvent loss, decreased to a still remarkable 30 K wide hysteresis. Single crystal X-ray structures of two iron(II) coordination polymers and T-dependent powder XRD patterns are discussed to obtain insight into the structure property relationship of those materials.

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