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.

A Promising New Schiff Base-like Ligand for the Synthesis of Octahedral Iron(II) Spin Crossover Complexes

2010 ◽  
Vol 65 (3) ◽  
pp. 323-328 ◽  
Author(s):  
Wolfgang Bauer ◽  
Tanja Ossiander ◽  
Birgit Weber
Keyword(s):  
Schiff Base ◽  
High Spin ◽  
Spin Crossover ◽  
Magnetic Measurements ◽  
X Ray ◽  
X Ray Crystallography ◽  
Tetradentate Schiff Base ◽  
Spin Crossover Complexes

A new tetradentate Schiff base-like ligand H2L (1) ((E,E)-dimethyl-2,2´-[1,2-phenylenebis(aminomethylidyne)] bis[3-oxobutanoate]) was synthesised and structurally characterised. Its reaction with iron(II) acetate leads to the formation of the octahedral N2O4-coordinated complex [FeL(MeOH)2] (2). The complex is a pure high-spin (HS) compound as is evident from magnetic measurements and X-ray crystallography.

Magnetic properties of some tridentate Schiff-base-manganese(II) complexes

1971 ◽  
Vol 24 (11) ◽  
pp. 2249 ◽  
Author(s):  
KD Butler ◽  
KS Murray ◽  
BO West
Keyword(s):  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Schiff Base ◽  
Anthranilic Acid ◽  
Room Temperature ◽  
Magnetic Moments ◽  
Calculated Data ◽  
Exchange Integral ◽  
X Ray ◽  
Tridentate Schiff Base

A series of manganese(II) chelates of stoicheiometry [MnL] have been synthesized, where LH2 is a dibasic tridenate Schiff base formed between a 5-substituted salicylaldehyde and either a 5-substituted β- hydroxyaniline or anthranilic acid. The complexes are extremely susceptible to oxidation in solution but stable when dry. Some of the complexes were isolated as hemihydrates and others as mixed hydrate- ethanolates. Magnetic susceptibility measurements over the temperature range 80-300�K have been made for a number of the complexes. In some cases the magnetic moments at room temperature are reduced slightly from the spin-only S = 5/2 value and show θ values of c. 15-50�K. The results can be interpreted in terms of binuclear or polynuclear structures with very small values of the exchange integral J. Comparisons between observed and calculated data are not as good as those shown in related VO2+, NiII, CuII, and FeIII systems for which X-ray crystal structures are known.

Synthesis, X-ray structure and magnetic properties of trinuclear copper(II) tridentate Schiff base complexes containing a partial cubane Cu3O4 core

Polyhedron ◽  
2003 ◽  
Vol 22 (21) ◽  
pp. 2927-2932 ◽  
Author(s):  
He-Dong Bian ◽  
Jing-Yuan Xu ◽  
Wen Gu ◽  
Shi-Ping Yan ◽  
Peng Cheng ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Schiff Base ◽  
Schiff Base Complexes ◽  
X Ray ◽  
Tridentate Schiff Base

Novel Cu(ii) complexes with NNO-Schiff base-like ligands – structures and magnetic properties

CrystEngComm ◽  
2018 ◽  
Vol 20 (6) ◽  
pp. 818-828 ◽  
Author(s):  
Katja Dankhoff ◽  
Birgit Weber
Keyword(s):  
Magnetic Properties ◽  
Schiff Base ◽  
X Ray ◽  
Tridentate Schiff Base

The X-ray structures and magnetic properties of 22 copper(ii) complexes, derived from six new tridentate Schiff base-like ligands and various conterions, are discussed.

scholarly journals Synthesis, Characterization, and Crystal Structure of [Co4(CH3CO2)2L4]2[BPh4]4·0.5H2O, Where HL = 4-(Salicylaldiminato)antipyrine

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Ramadan M. El-mehdawi ◽  
Abdussalam N. EL-dewik ◽  
Mufida M. Ben-Younes ◽  
Fathia A. Treish ◽  
Ramadan G. Abuhmaiera ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Schiff Base ◽  
Single Crystal ◽  
Elemental Analysis ◽  
Schiff Base Ligand ◽  
Title Complex ◽  
Single Crystal Diffraction ◽  
X Ray ◽  
Tridentate Schiff Base

The title complex was isolated as a red solid from the reaction of 4-(salicylaldiminato)antipyrine, HL, and cobalt (II) acetate in ethanol. The complex has been characterized by elemental analysis, FTIR, UV-Vis, and X-ray single crystal diffraction. Two crystallographically different cationic units, A and B, of the title complex are found. Both units are essentially isostructural; nevertheless, small differences exist between them. Both units contain four cobalt atoms arranged at the corners of distorted cubane-like core alternatively with phenoxy oxygen of the Schiff base. In both cases, one cobalt binds to three coordinated sites from the corresponding tridentate Schiff base ligand, and the fourth one was bonded by the acetate oxygen, and the fifth and the sixth donor sites come from the phenolate oxygen of another Schiff base ligand.

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