scholarly journals Impact of dehydration and mechanical amorphization on the magnetic properties of Ni(ii)-MOF-74

2020 ◽  
Vol 8 (21) ◽  
pp. 7132-7142 ◽  
Author(s):  
Senada Muratović ◽  
Bahar Karadeniz ◽  
Tomislav Stolar ◽  
Stipe Lukin ◽  
Ivan Halasz ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Spin Crossover ◽  
Bulk Magnetization

While desolvation process does not influence the magnetism of Ni-MOF-74, amorphization causes partial nickel(ii) spin-crossover from S = 1 to S = 0 and the decrease of the bulk magnetization.

Single crystal to single crystal transformation of spin-crossover coordination polymers from 3D frameworks to 2D layers

2021 ◽  
Vol 9 (15) ◽  
pp. 5082-5087
Author(s):  
Yu Gong ◽  
Wang-Kang Han ◽  
Hui-Shu Lu ◽  
Qing-Tao Hu ◽  
Huan Tu ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Single Crystal ◽  
Coordination Polymers ◽  
Ligand Exchange ◽  
Spin Crossover ◽  
Metal Organic Frameworks ◽  
Crystal Transformation ◽  
Metal Organic

New Hofmann-type metal–organic frameworks display rare and complete ligand exchange induced single crystal to single crystal transformations from 3D frameworks to 2D layers, accompanied by magnetic properties transition from two-step SCO behavior to hysteretic SCO behavior.

scholarly journals Spin Cross-Over (SCO) Complex Based on Unsymmetrical Functionalized Triazacyclononane Ligand: Structural Characterization and Magnetic Properties

2019 ◽  
Vol 5 (1) ◽  
pp. 19 ◽  
Author(s):  
Merzouk Halit ◽  
Mélissa Roger ◽  
Véronique Patinec ◽  
Said Yefsah ◽  
Carlos Gómez-García ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Thermal Decomposition ◽  
Magnetic Properties ◽  
Nmr Spectroscopy ◽  
Functional Groups ◽  
Structural Characterization ◽  
Spin Crossover ◽  
Magnetic Studies ◽  
Dsc Measurements ◽  
Hexadentate Ligand

The unsymmetrical ligand 1-(2-aminophenyl)-4,7-bis(pyridin-2-ylmethyl)-1,4,7-triazacyclononane (L6) has been prepared and characterized by NMR spectroscopy. The L6 ligand is based on the triazamacrocycle (tacn) ring that is functionalized by two flexible 2-pyridylmethyl and one rigid 2-aminophenyl groups. Reaction of this ligand with Fe(ClO4)2·xH2O led to the complex [Fe(L6)](ClO4)2 (1), which was characterized as the first Fe(II) complex based on the unsymmetrical N-functionalized tacn ligand. The crystal structure revealed a discrete monomeric [FeL6]2+ entity in which the unsymmetrical N-functionalized triazacyclononane molecule (L6) acts as hexadentate ligand. As observed in the few parent examples that are based on the symmetrical N-functionalized tacn ligands, the triazacyclononane ring is facially coordinated and the N-donor atoms of the three functional groups (two pyridine and one aniline groups) are disposed in the same side of the tacn ring, leading to a distorted FeN6 environment. The magnetic studies of 1 revealed the presence of an incomplete spin crossover (SCO) transition above 425 K, whose progress would be prevented by a very exothermic thermal decomposition at ca. 472 K, as shown by thermogravimetric and DSC measurements.

Magnetic properties of novel dendrimeric spin crossover iron(III) complex

2016 ◽  
Vol 439 ◽  
pp. 186-195 ◽  
Author(s):  
Natalia Domracheva ◽  
Valerya Vorobeva ◽  
Andrew Pyataev ◽  
Rui Tamura ◽  
Katsuaki Suzuki ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Spin Crossover

scholarly journals Magnetism, Conductivity and Spin-Spin Interactions in Layered Hybrid Structure of Anionic Radicals [Ni(dmit)2] Alternated by Iron(III) Spin-Crossover Complex [Fe(III)(3-OMe-Sal2trien)] and Ferric Moiety Precursors

Molecules ◽  
2020 ◽  
Vol 25 (21) ◽  
pp. 4922
Author(s):  
Yuri N. Shvachko ◽  
Nataliya G. Spitsyna ◽  
Denis V. Starichenko ◽  
Vladimir N. Zverev ◽  
Leokadiya V. Zorina ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Anion Radical ◽  
Spin Crossover ◽  
Hybrid Structure ◽  
Two Dimensional ◽  
Cooperative Interactions ◽  
Spin Interactions ◽  
Ground Spin State ◽  
Spin Pairs ◽  
System 1

In this study, crystals of the hybrid layered structure, combined with Fe(III) Spin-Crossover (SCO) complexes with metal-dithiolate anionic radicals, and the precursors with nitrate and iodine counterions, are obtained and characterized. [Fe(III)(3-OMe-Sal2trien)][Ni(dmit)2] (1), [Fe(III)(3-OMe-Sal2trien)]NO3·H2O (2), [Fe(III)(3-OMe-Sal2trien)]I (3) (3-OMe-Sal2trien = hexadentate N4O2 Schiff base is the product of the condensation of triethylenetetramine with 3-methoxysalicylaldehyde; H2dmit = 2-thioxo-1,3-dithiole-4,5-dithiol). Bulk SCO transition was not achieved in the range 2.0–350 K for all three compounds. Alternatively, the hybrid system (1) exhibited irreversible segregation into the spatial fractions of Low-Spin (LS) and High-Spin (HS) phases of the ferric moiety, induced by thermal cycling. Fractioning was studied using both SQUID and EPR methods. Magnetic properties of the LS and HS phases were analyzed in the framework of cooperative interactions with anionic sublattice: Anion radical layers Ni(dmit)2 (1), and H-bonded chains with NO3 and I (2,3). LS phase of (1) exhibited unusual quasi-two-dimensional conductivity related to the Arrhenius mechanism in the anion radical layers, ρ||c = 2 × 105 Ohm·cm and ρ⊥c = 7 × 102 Ohm·cm at 293 K. Ground spin state of the insulating HS phase was distinctive by ferromagnetically coupled spin pairs of HS Fe3+, S = 5/2, and metal-dithiolate radicals, S = 1/2.

Isostructural iron(iii) spin crossover complexes with a tridentate Schiff base-like ligand: X-ray structures and magnetic properties

2019 ◽  
Vol 48 (41) ◽  
pp. 15376-15380 ◽  
Author(s):  
Katja Dankhoff ◽  
Birgit Weber
Keyword(s):  
Magnetic Properties ◽  
Schiff Base ◽  
Spin Crossover ◽  
X Ray ◽  
Size Dependent ◽  
Spin Crossover Complexes ◽  
Tridentate Schiff Base

Two isostructural iron(iii) spin crossover complexes show anion-size dependent spin crossover.

Spin Crossover and Magnetic Properties of Ba-Substituted Cobaltites

2019 ◽  
Vol 128 (1) ◽  
pp. 98-104 ◽  
Author(s):  
I. O. Troyanchuk ◽  
M. V. Bushinsky ◽  
V. V. Sikolenko ◽  
C. Ritter
Keyword(s):  
Magnetic Properties ◽  
Spin Crossover
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