Anion-driven supramolecular modulation of spin-crossover properties in mononuclear iron(iii) Schiff-base complexes

2021 ◽  
Author(s):  
Zong-Mei Yu ◽  
Sheng-Ze Zhao ◽  
Yu-Ting Wang ◽  
Peng-Yu Xu ◽  
Chun-Yan Qin ◽  
...  
Keyword(s):  
Schiff Base ◽  
Spin Crossover ◽  
Supramolecular Structures ◽  
Schiff Base Complexes ◽  
Mononuclear Iron

A series of iron(iii) complexes [Fe(5-F-sal-N-1,4,7,10)]Y (Y = anion) have been studied in detail which gave the understanding of the influence of anion effects and intermolecular supramolecular structures on their spin crossover properties.

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

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.

Spin crossover and high spin electroneutral mononuclear iron(iii) Schiff base complexes involving terminal pseudohalido ligands

2015 ◽  
Vol 39 (1) ◽  
pp. 508-519 ◽  
Author(s):  
Petra Masárová ◽  
Pavel Zoufalý ◽  
Ján Moncol ◽  
Ivan Nemec ◽  
Ján Pavlik ◽  
...  
Keyword(s):  
Schiff Base ◽  
High Spin ◽  
Spin State ◽  
Spin Crossover ◽  
High Spin State ◽  
Schiff Base Complexes ◽  
Mononuclear Iron ◽  
State Behaviour

Six new Schiff-base complexes (1–6) with pseudohalido terminal ligands exhibits spin crossover or high spin state behaviour.

An insight to the noncovalent interactions in two triamine based mononuclear iron(III) Schiff base complexes with special emphasis on the formation of Br•••π halogen bonding

CrystEngComm ◽  
2021 ◽  
Author(s):  
Shouvik Chattopadhyay ◽  
Tanmoy Basak ◽  
Antonio Frontera
Keyword(s):  
Schiff Base ◽  
Solid State ◽  
Noncovalent Interactions ◽  
Halogen Bonding ◽  
Schiff Base Complexes ◽  
X Ray ◽  
Mononuclear Iron

Two mononuclear iron(III) complexes, [FeL1Cl]∙CH3CN (1) and [FeL2(N3)] (2) {H2L1= N,N′-bis(5-chlorosalicylidene)diethylenetriamine and H2L2= N,N′-bis(5-bromosalicylidene)diethylenetriamine}, have been synthesized and characterized by X-ray crystallographic studies. In the solid state, there are strong...

Series of high spin mononuclear iron(iii) complexes with Schiff base ligands derived from 2-hydroxybenzophenones

2017 ◽  
Vol 41 (13) ◽  
pp. 5904-5915 ◽  
Author(s):  
Lukáš Pogány ◽  
Ján Moncol ◽  
Ján Pavlik ◽  
Ivan Šalitroš
Keyword(s):  
Schiff Base ◽  
High Spin ◽  
Coupled Systems ◽  
Schiff Base Complexes ◽  
Schiff Base Ligands ◽  
Mononuclear Iron ◽  
P Utilization

Utilization of 2-hydroxybenzophenone derivatives for the preparation of iron(iii) Schiff base complexes resulted in a series of high-spin, mostly antiferromagnetically coupled systems.

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 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.

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