Dimethylvioluratobis(phenanthroline)cobalt(II), a Novel Spin-Crossover Octahedral Co(II) Complex. Synthesis, Crystal Structure and Magnetic Properties of [Co(dmvi)(phen)2]ClO4.cntdot.3H2O

1994 ◽  
Vol 33 (24) ◽  
pp. 5535-5540 ◽  
Author(s):  
Juan Faus ◽  
Miguel Julve ◽  
Francisco Lloret ◽  
Jose A. Real ◽  
Jorunn Sletten
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Spin Crossover

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.

scholarly journals Spin Crossover in Three Mononuclear Iron (III) Schiff Base Complexes

Metals ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 849 ◽  
Author(s):  
Ivan Nemec ◽  
Ingrid Svoboda ◽  
Radovan Herchel
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Schiff Base ◽  
Spin Crossover ◽  
Theoretical Calculations ◽  
Magnetic Behavior ◽  
Schiff Base Complexes ◽  
Mononuclear Iron ◽  
Mononuclear Complexes

The synthesis, crystal structure, and magnetic properties of three new mononuclear complexes [Fe(R-LA)(L1)](BPh4), where R-LA2− is a doubly deprotonated pentadentate Schiff base ligand and L1 is a monodentate benzimidazole or furopyridine ligand, are reported. Ligand- and anion-driven changes in crystal structures and magnetic behavior were investigated in terms of the magnetic susceptibility measurements and theoretical calculations.

Crystal structure and magnetic properties of the spin crossover complex FeII(ethyl nicotinate)2[AuI(CN)2]2

2014 ◽  
Vol 38 (5) ◽  
pp. 1955-1958 ◽  
Author(s):  
Akihiro Sugaya ◽  
Shotaro Ueno ◽  
Jun Okabayashi ◽  
Takafumi Kitazawa
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Phase Transitions ◽  
Coordination Polymer ◽  
Spin Crossover ◽  
Ethyl Nicotinate

A new FeII two-step spin crossover (SCO) coordination polymer, FeII(ethyl nicotinate)2[AuI(CN)2]21, with four-inflection associated with phase transitions, has been synthesized.

Synthesis, crystal structure and magnetic properties of the spin crossover system [Fe(pq)3]2+

2008 ◽  
Vol 361 (14-15) ◽  
pp. 4047-4054 ◽  
Author(s):  
Iis Siti Jahro ◽  
Djulia Onggo ◽  
Ismunandar ◽  
Susanto Imam Rahayu ◽  
M. Carmen Muñoz ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Spin Crossover
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