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

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.

2014 ◽  
Vol 50 (70) ◽  
pp. 10074-10077 ◽  
Author(s):  
Daisuke Tanaka ◽  
Naoki Aketa ◽  
Hirofumi Tanaka ◽  
Takashi Tamaki ◽  
Tomoko Inose ◽  
...  

Spin-crossover nanoparticles form homogeneous thin films on substrates, which show abrupt spin transitions with large thermal hysteresis loops.


2019 ◽  
Vol 6 (1) ◽  
pp. 10-18 ◽  
Author(s):  
Lisa Zappe ◽  
Charles Lochenie ◽  
Thomas Martin ◽  
Birgit Weber

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.


2016 ◽  
Vol 40 (5) ◽  
pp. 4687-4695 ◽  
Author(s):  
Charles Lochenie ◽  
Andreas Gebauer ◽  
Ottokar Klimm ◽  
Florian Puchtler ◽  
Birgit Weber

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.


Tetrahedron ◽  
2010 ◽  
Vol 66 (45) ◽  
pp. 8729-8733 ◽  
Author(s):  
M.S. Wrackmeyer ◽  
M. Hummert ◽  
H. Hartmann ◽  
M.K. Riede ◽  
K. Leo

AIChE Journal ◽  
2014 ◽  
Vol 60 (10) ◽  
pp. 3634-3646 ◽  
Author(s):  
Wen Jing Lin ◽  
Shu Yu Nie ◽  
Quan Chen ◽  
Yu Qian ◽  
Xiu Fang Wen ◽  
...  

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