Influence of the outersphere anion on the properties of the spin transition in Fe(4-OCH3-SalEen)2
                     Y (Y = PF6, NO3)

Иванова, Т. А.; Овчинников, И. В.; Туранов, А. Н.

doi:10.1134/s1063783407110194

Cited by 20 publications

(11 citation statements)

References 12 publications

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“…At room temperature, the anisotropic nature is diminished and an isotropic broad spectrum is observed with a g iso value of 2.13. At the highest temperature (380 K) two new peaks are observed at g 1 =9.29 and g 2 =3.78 along with an isotropic peak at g iso =2, these signals correspond to Fe(III) high spin center with high rhombicity (E/D∼0.33) . It is important to note that separate observation of high spin and low spin signals in the same spectrum is an indication that the rate of spin state conversion is much slower than the frequency of EPR spectroscopy measurement (∼10 10 S −1 in X‐band) …”

Section: Resultsmentioning

confidence: 93%

Effect of Ligand Field Strength on the Spin Crossover Behaviour in 5‐X‐SalEen (X=Me, Br and OMe) Based Fe(III) Complexes

Dey

Mondal

Konar

2020

Chemistry An Asian Journal

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The reaction of Fe(NCS) 3 prepared in situ in MeOH with 5-X-SalEen ligands (5-X-SalEen = condensation product of 5-substituted salicylaldehyde and N-ethylethylenediamine) provided three Fe(III) complexes, [Fe(5-X-SalEen) 2 ]NCS; X=Me (1), X=Br (2), X=OMe (3). All the complexes reveal similar structural features but a very different magnetic profile. Complex 1 shows a gradual spin crossover while complexes 2 and 3 show a sharp spin transition. The T 1/2 for complex 2 is 237 K while for complex 3 it is much higher with a value of 361 K. The spin transition temperature is shifted towards higher temperature with increasing electron-donation ability of the ligand substituents. This experimental observation has been rationalized with DFT calculations. UV-Vis and cyclic voltammetry studies support the fact that the electron density on the ligand increases from Me to Br to OMe substituents. To understand the change in spin states, temperature-dependent EPR spectra have been recorded. The spin state equilibrium in the liquid state has been probed with Evans NMR spectroscopic method, and thermodynamic parameters have been evaluated for all complexes.

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Section: Resultsmentioning

confidence: 93%

Effect of Ligand Field Strength on the Spin Crossover Behaviour in 5‐X‐SalEen (X=Me, Br and OMe) Based Fe(III) Complexes

Dey

Mondal

Konar

2020

Chemistry An Asian Journal

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“…Hendrickson and co-workers reported the first examples of salEen derivatives SCO compounds and also reported the distinct abrupt SCO profile for the [Fe(3-OMesalEen) 2 ]PF 6 system [36]. This report led to a number of new SCO compounds of the type [Fe(X-salEen) 2 [35,37] displaying a range of SCO profiles from incomplete and gradual to complete. Among salEen derivatives, it has been observed that Cl -and NO 3 -complexes tend to stabilise the LS state, and BPh 4 -complexes adopt preferably the HS state [35,38,39].…”

Section: Introductionmentioning

confidence: 97%

Solution and solid state properties of Fe(III) complexes bearing N-ethyl-N-(2-aminoethyl)salicylaldiminate ligands

Martinho

Vicente

Realista

et al. 2014

Journal of Organometallic Chemistry

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“…For the sake of comparison, the analogous parameters are listed in Table 1 for the bis(tridentate) iron(III) complex, Fe[L] 2 PF 6 , with PF 6 -as the counterion. [36] In Table 1 The dynamic process involved in changing the number of the two different types of LS centers with temperature, as illustrated in Figure 7 (a), will now be explored. The temperature dependence of increasing the number of the second-type of LS centers (n 2 ) from the first-type of LS centers (n 1 ) can be characterized by the equilibrium constant K 1 and described by Equation (4).…”

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confidence: 99%

Structural, Magnetic and Dynamic Characterization of Liquid Crystalline Iron(III) Schiff Base Complexes with Asymmetric Ligands

et al. 2011

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The iron(III) complexes that were formed by coordination of the Fe III ion with the asymmetric tridentate liquid crystalline Schiff base ligand (L), the water molecules and the different counterions [PF 6 -(1), NO 3 -(2), and Cl -(3)] were studied by electron paramagnetic resonance (EPR) spectroscopy. EPR spectroscopy demonstrated that each of the complexes investigated consists of two types of iron centers: S = 1/2 low-spin (LS) and S = 5/2 high-spin (HS). LS iron complexes 2, 3 and LS complex 1 in the temperature range 4. + X -, with X = PF 6 -as the counterion. The LS and HS iron centers of 1 are coupled together antiferromagnetically and form a dimer structure by means of the water molecules and the PF 6 -counterion. The second-type of LS and HS cen-

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Influence of the outersphere anion on the properties of the spin transition in Fe(4-OCH3-SalEen)2 Y (Y = PF6, NO3)

Cited by 20 publications

References 12 publications

Effect of Ligand Field Strength on the Spin Crossover Behaviour in 5‐X‐SalEen (X=Me, Br and OMe) Based Fe(III) Complexes

Effect of Ligand Field Strength on the Spin Crossover Behaviour in 5‐X‐SalEen (X=Me, Br and OMe) Based Fe(III) Complexes

Solution and solid state properties of Fe(III) complexes bearing N-ethyl-N-(2-aminoethyl)salicylaldiminate ligands

Structural, Magnetic and Dynamic Characterization of Liquid Crystalline Iron(III) Schiff Base Complexes with Asymmetric Ligands

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