scholarly journals The relationship between the strength of hydrogen bonding and spin crossover behaviour in a series of iron(iii) Schiff base complexes

2015 ◽  
Vol 44 (10) ◽  
pp. 4474-4484 ◽  
Author(s):  
Ivan Nemec ◽  
Radovan Herchel ◽  
Zdeněk Trávníček
Keyword(s):  
Hydrogen Bonding ◽  
Schiff Base ◽  
Spin Crossover ◽  
Schiff Base Complexes ◽  
Magnetic Spin ◽  
Solvent Molecules ◽  
The Relationship

The magnetic (spin crossover) properties of the complexes were tuned by the different crystal solvent molecules.

scholarly journals Structural Evidence of Spin State Selection and Spin Crossover Behavior of Tripodal Schiff Base Complexes of tris(2-aminoethyl)amine and Related Tripodal Amines

2020 ◽  
Vol 6 (2) ◽  
pp. 28
Author(s):  
Greg Brewer
Keyword(s):  
Schiff Base ◽  
Spin State ◽  
Density Functional ◽  
Spin Crossover ◽  
Bimodal Distribution ◽  
Structural Features ◽  
Schiff Base Complexes ◽  
Mononuclear Iron ◽  
Experimental Values ◽  
State Selection

A review of the tripodal Schiff base (SB) complexes of tris(2-aminoethyl)amine, Nap(CH2CH 2NH2)3 (tren), and a few closely related tripodal amines with Cr(II), Mn(III) (d4), Mn(II), Fe(III) (d5), Fe(II) (d6), and Co(II) (d7) is provided. Attention is focused on examination of key structural features, the M-Nimine, M-Namine, or M-O and M-Nap bond distances and Nimine-M-N(O) bite and C-Nap-C angles and how these values correlate with spin state selection and spin crossover (SCO) behavior. A comparison of these experimental values with density functional theory calculated values is also given. The greatest number, 132, of complexes is observed with cationic mononuclear iron(II) in a N6 donor set, Fe(II)N6. The dominance of two spin states, high spin (HS) and low spin (LS), in these systems is indicated by the bimodal distribution of histogram plots of Fe(II)-Nimine and Fe(II)-Nazole/pyridine bond distances and of Nimine–Fe(II)-Nazole/pyridine and C-Nap-C bond angles. The values of the two maxima, corresponding to LS and HS states, in each of these histograms agree closely with the theoretical values. The iron(II)-Nimine and iron(II)-Nazole/pyridine bond distances correlate well for these complexes. Examples of SCO complexes of this type are tabulated and a few of the 20 examples are discussed that exhibit interesting features. There are only a few mononuclear iron(III) cationic complexes and one is SCO. In addition, a significant number of supramolecular complexes of these ligands that exhibit SCO, intervalence, and chiral recognition are discussed. A summary is made regarding the current state of this area of research and possible new avenues to explore based on analysis of the present data.

scholarly journals Impact of Substituent Variation on the Presence of Thermal Spin Crossover in a Series of Mononuclear Iron(III) Schiff Base Complexes with Terminal Pseudohalido Co-ligands

2017 ◽  
Vol 24 (20) ◽  
pp. 5191-5203 ◽  
Author(s):  
Lukáš Pogány ◽  
Barbora Brachňaková ◽  
Ján Moncol ◽  
Ján Pavlik ◽  
Ivan Nemec ◽  
...  
Keyword(s):  
Schiff Base ◽  
Spin Crossover ◽  
Schiff Base Complexes ◽  
Mononuclear Iron

Heteronuclear Iron(III)–Schiff Base Complexes with the Hexacyanidocobaltate(III) Anion: On the Quest To Understand the Governing Factors of Spin Crossover

2020 ◽  
Vol 59 (5) ◽  
pp. 2747-2757 ◽  
Author(s):  
Ján Pavlik ◽  
Petra Masárová ◽  
Ivan Nemec ◽  
Olaf Fuhr ◽  
Mario Ruben ◽  
...  
Keyword(s):  
Schiff Base ◽  
Spin Crossover ◽  
Schiff Base Complexes

scholarly journals Crystal structure of bis(2-{[(pyridin-2-yl)methylidene]amino}benzoato-κ3N,N′,O)cobalt(II)N,N-dimethylformamide sesquisolvate

2014 ◽  
Vol 70 (10) ◽  
pp. 164-166 ◽  
Author(s):  
Elena A. Buvaylo ◽  
Vladimir N. Kokozay ◽  
Olga Yu. Vassilyeva ◽  
Brian W. Skelton
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
Schiff Base ◽  
Coordination Sphere ◽  
Anthranilic Acid ◽  
Crystal Packing ◽  
Schiff Base Ligands ◽  
Complex Molecules ◽  
Hydrogen Bonding Interactions ◽  
Solvent Molecules

The title compound, [Co(C13H9N2O2)2]·1.5C3H7NO, is formed as a neutral CoIIcomplex with dimethylformamide (DMF) solvent molecules. The CoIIatom has a distorted O2N4octahedral coordination sphere defined by two tridentate anionic Schiff base ligands with the O atoms beingcis. The coordination sphere around the CoIIatom is geometrically different from that reported for the co-crystal [Co(C13H9N2O2)2]·AA·H2O (AA is anthranilic acid). One of the DMF solvent molecules was modelled as being disordered about a crystallographic inversion centre with half-occupancy. The crystal structure is made up from alternating layers of complex molecules and DMF molecules parallel to (010). C—H...O hydrogen-bonding interactions between the complex molecules and the solvent molecules consolidate the crystal packing.

Magnetic spin equilibriums in some new five-coordinate Schiff base complexes of cobalt(II)

1972 ◽  
Vol 11 (3) ◽  
pp. 457-461 ◽  
Author(s):  
Luigi G. Marzilli ◽  
Patricia A. Marzilli
Keyword(s):  
Schiff Base ◽  
Schiff Base Complexes ◽  
Magnetic Spin

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.

CURIOSITIES OF SPIN-CROSSOVER FERRIC SCHIFF-BASE COMPLEXES

1981 ◽  
pp. 75-86 ◽  
Author(s):  
D.N. Hendrickson ◽  
M.S. Haddad ◽  
W.D. Federer ◽  
M.W. Lynch
Keyword(s):  
Schiff Base ◽  
Spin Crossover ◽  
Schiff Base Complexes

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

A family of homochiral spin-crossover iron(II) imidazole Schiff-base complexes

2015 ◽  
Vol 51 ◽  
pp. 50-54 ◽  
Author(s):  
Dong-Hong Ren ◽  
Xiao-Li Sun ◽  
Ling Gu ◽  
Dan Qiu ◽  
Zaijun Li ◽  
...  
Keyword(s):  
Schiff Base ◽  
Spin Crossover ◽  
Schiff Base Complexes
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