scholarly journals Enhanced dielectricity coupled to spin-crossover in a one-dimensional polymer iron(ii) incorporating tetrathiafulvalene

2020 ◽  
Vol 11 (24) ◽  
pp. 6229-6235 ◽  
Author(s):  
Ya-Ru Qiu ◽  
Long Cui ◽  
Pei-Yu Cai ◽  
Fei Yu ◽  
Mohamedally Kurmoo ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Schiff Base ◽  
Room Temperature ◽  
Spin Crossover ◽  
One Dimensional ◽  
Redox Active ◽  
Crossover Transition

A concerted bending–flattening motion of the redox-active TTF within constructed one-dimensional FeII–TTF–Schiff-base chain with bridging 4,4′-bpy enhances the dielectric constant coupled to its spin-crossover transition above room temperature.

Iron(II) Spin Crossover Complexes Based on a Redox Active Equatorial Schiff-Base-Like Ligand

2020 ◽  
Vol 59 (12) ◽  
pp. 8320-8333 ◽  
Author(s):  
Sophie Schönfeld ◽  
Katja Dankhoff ◽  
Dirk Baabe ◽  
Marc-Kevin Zaretzke ◽  
Martin Bröring ◽  
...  
Keyword(s):  
Schiff Base ◽  
Spin Crossover ◽  
Redox Active ◽  
Spin Crossover Complexes

Thin Deposits and Patterning of Room-Temperature-Switchable One-Dimensional Spin-Crossover Compounds

Langmuir ◽  
2011 ◽  
Vol 27 (7) ◽  
pp. 4076-4081 ◽  
Author(s):  
Massimiliano Cavallini ◽  
Ilaria Bergenti ◽  
Silvia Milita ◽  
Jean Crispin Kengne ◽  
Denis Gentili ◽  
...  
Keyword(s):  
Room Temperature ◽  
Spin Crossover ◽  
One Dimensional

Steric Trapping of the High Spin State in FeIII Quinolylsalicylaldimine Complexes

2014 ◽  
Vol 67 (11) ◽  
pp. 1574 ◽  
Author(s):  
Darunee Sertphon ◽  
David J. Harding ◽  
Phimphaka Harding ◽  
Keith S. Murray ◽  
Boujemaa Moubaraki ◽  
...  
Keyword(s):  
Schiff Base ◽  
Electronic Properties ◽  
High Spin ◽  
Spin State ◽  
Schiff Base Ligand ◽  
Room Temperature ◽  
Spin Crossover ◽  
High Spin State ◽  
Electrochemical Studies ◽  
Magnetic Studies

A new sterically bulky Schiff base ligand, N-(8-quinolyl)-5-tert-butylsalicylaldimine (Hqsal-5-tBu) has been prepared and a series of FeIII complexes, [Fe(qsal-5-tBu)2]Y (Y = Cl 1, ClO4 2, NO3 3, BF4 4) utilising this ligand are reported and fully characterised. UV-vis spectroscopic and electrochemical studies indicate that 1–4 are high spin (HS) in solution at room temperature and further suggest that the tBu group only slightly alters the electronic properties of 1–4 compared with related [Fe(qsal-5-X)2]+ systems. The structures of [Fe(qsal-5-tBu)2]Cl·4MeOH·H2O 1, [Fe(qsal-5-tBu)2]ClO4·MeOH 2, and [Fe(qsal-5-tBu)2]NO3 3 determined at 100 K reveal HS FeIII centres in all cases. Four-fold parallel aryl embraces and π–π interactions serve to link the cations forming 2D sheets mirroring the motifs found in other [Fe(qsal-5-X)2]+ complexes. Despite this the tBu group causes strong distortions at the Fe centre which as magnetic studies reveal prevent spin crossover trapping 1–4 in the HS state.

The effect of molecular packing on the occurrence of spin crossover phenomena in one-dimensional Fe(II)-bis-Schiff base complexes

2008 ◽  
Vol 361 (12-13) ◽  
pp. 3489-3493 ◽  
Author(s):  
Atsuhiro Nabei ◽  
Takayoshi Kuroda-Sowa ◽  
Takashi Okubo ◽  
Masahiko Maekawa ◽  
Megumu Munakata
Keyword(s):  
Schiff Base ◽  
Spin Crossover ◽  
Molecular Packing ◽  
Schiff Base Complexes ◽  
One Dimensional

Spin crossover modulation in a coordination polymer with the redox-active bis-pyridyltetrathiafulvalene (py2TTF) ligand

2020 ◽  
Vol 56 (72) ◽  
pp. 10469-10472 ◽  
Author(s):  
Lisa Zappe ◽  
Sophie Schönfeld ◽  
Gerald Hörner ◽  
Katrina A. Zenere ◽  
Chanel F. Leong ◽  
...  
Keyword(s):  
Schiff Base ◽  
Coordination Polymer ◽  
Spin Crossover ◽  
Redox Activity ◽  
Redox Active

A 1-D chain CP with both SCO and redox activity has been successfully prepared by the combination of a bis-pyridyl functionalised TTF core and a Schiff base-like N2O2 ligand.

One-Dimensional Iron(II) Compounds Exhibiting Spin Crossover and Liquid Crystalline Properties in the Room Temperature Region

2008 ◽  
Vol 47 (22) ◽  
pp. 10232-10245 ◽  
Author(s):  
M. Seredyuk ◽  
A. B. Gaspar ◽  
V. Ksenofontov ◽  
Y. Galyametdinov ◽  
M. Verdaguer ◽  
...  
Keyword(s):  
Temperature Region ◽  
Liquid Crystalline ◽  
Room Temperature ◽  
Spin Crossover ◽  
One Dimensional

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.

A facile route for preparation of monodisperse nanoparticles of one-dimensional Fe(ii)-4-amino-1,2,4-triazole coordination polymers with hysteretic spin-crossover near room temperature

RSC Advances ◽  
2014 ◽  
Vol 4 (74) ◽  
pp. 39126-39131 ◽  
Author(s):  
Meng-Ya Chen ◽  
Xuan-Rong Chen ◽  
Wei-Hua Ning ◽  
Xiao-Ming Ren
Keyword(s):  
Coordination Polymers ◽  
Room Temperature ◽  
Spin Crossover ◽  
One Dimensional ◽  
Monodisperse Nanoparticles ◽  
Facile Route

Monodisperse nanoparticles of one-dimensional Fe(II)-4-amino-1,2,4-triazole coordination polymers show hysteretic spin-crossover near room temperature.

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