High-spin Fe(III) Schiff based complexes with photoactive ligands. Synthesis, EPR study and magnetic properties

Груздев, М. С.; Vorobeva, V.E.; Zueva, Ekaterina М.; Chervonova, U. V.; Petrova, Maria M.; Domracheva, N. E.

doi:10.1016/j.poly.2018.08.072

Cited by 8 publications

(3 citation statements)

References 20 publications

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“…Moreover, many anions exist only within a relatively narrow pH window and may become protonated at low pH values. [9] Finally, for the assembly of crystalline structures, anions are usually coordinatively saturated and thus can only bind to the host through non-covalent or weakly covalent interactions, like hydrogen bonds, [10] halogen bonds, [11] coordinative bonds, [12] dipole-dipole, [13] ion-dipole, [14] π-π stacking, [15] anion-π stacking [16] or van der Waals forces. [17] SCO-based materials and their related properties have been outlined in many reviews.…”

Section: Introductionmentioning

confidence: 99%

Anion Effects on Spin Crossover Systems: From Supramolecular Chemistry to Magnetism

Zhao

Zhou

Qin

et al. 2023

Chemistry A European J

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The field of anion supramolecular chemistry has received more and more attention in recent years. Anions with diverse types and geometries have been widely used for the synthesis of ionic spin crossover (SCO) complexes. This review is devoted to anion effects on the molecular, supramolecular structures and magnetic properties of discrete SCO compounds. Firstly, typical anions used in the synthesis of these compounds are briefly summarized according to their various geometries. This is followed by a collection of representative examples of anion‐based SCO compounds, whose SCO properties are analyzed in terms of supramolecular interactions, geometry and charge of anions. In the third part, anion effects on SCO complexes of different kinds of metal centers and ligands are outlined and finally remarks on the synthesis new type of ionic SCO complexes in the future are described.

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Section: Introductionmentioning

confidence: 99%

Anion Effects on Spin Crossover Systems: From Supramolecular Chemistry to Magnetism

Zhao

Zhou

Qin

et al. 2023

Chemistry A European J

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“…To rationalize the experimental observations, the electronic absorption spectrum calculations were carried out via time-dependent DFT. According to our previous studies [ 36 , 37 ], the cationic complex may adopt either a meridional ( a ) or a facial ( b ) isomeric form ( Figure 3 ), wherein ( a ) the N -ethyl- N -(2-aminoethyl)salicylaldiminate (salEen) ligand moieties are not bent and adopt a meridional coordination mode, or ( b ) they are bent and form a coordination core with an O−Fe−O axis and two N−Fe−N(H) axes, i.e., the two N- or the two N(H)-donor atoms are cis to one another ( Figure 3 ). Note that a facial trans -counterpart with the O−Fe−O, N−Fe−N, and N(H)−Fe−N(H) axes is the most energetically unfavorable isomeric form and, therefore, its formation is highly unlikely.…”

Section: Resultsmentioning

confidence: 99%

Dendritic Iron(III) Carbazole Complexes: Structural, Optical, and Magnetic Characteristics

et al. 2021

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This paper focuses on the synthesis, structural characterization, and study of the optical, magnetic, and thermal properties of novel architectures combining metal ions as magnetoactive centers and photoactive blocks formed by carbazole units. For this purpose, a series of azomethine complexes of the composition [Fe(L)2]X (L = 3,6-bis[(3′,6′-di-tert-butyl-9-carbazol)-9-carbazol]benzoyloxy-4-salicylidene-N′-ethyl-N-ethylenediamine, X = NO3−, Cl−, PF6−) were synthesized by the reaction of metal salts with Schiff bases in a mixture of solvents. The UV–Vis absorption properties were studied in dichloromethane and rationalized via time-dependent density functional theory (DFT) calculations. Upon excitation at 350 nm, the compounds exhibited an intense dual fluorescence with two emission bands centered at ~445 and ~485 nm, which were assigned to πcarb–π* intraligand and πcarb–dFe ligand-to-metal charge-transfer excited states. EPR spectroscopy and SQUID magnetometry revealed solid-state partial spin crossover in some compounds, and antiferromagnetic interactions between the neighboring Fe(III) ions.

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“…This approach is more justified, because the target coordination compounds are obtained in one stage. [27] 2.3. Infrared spectra of the compounds were recorded in the region of 7,500-370 cm −1 from pellets with KBr and CsBr.…”

Section: Synthesis Of Schiff Basementioning

confidence: 99%

Schiff base complexes with different metals incorporating derivatives of 3,6‐di‐tert‐butylcarbazole

Груздев

Chervonova

Ksenofontov

et al. 2021

Applied Organom Chemis

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Four new mononuclear complexes formed by the asymmetric azomethine ligand have been synthesized and characterized. Fe (III), Ga (III), Cu (II), and Co (II) ions were used as a central metal ion. The chelating ligand contains derivatives of 3,6-di-tert-butylcarbazole as a chromophor. The data of far FT-IR spectroscopy and mass spectrometry confirmed the formation of HC N bond and the coordination of metal ion through deprotonated oxygen and azomethine nitrogen. The X-ray powder analysis of polycrystalline complexes showed that the crystal cells of all complexes are triclinic, with unit cells containing four molecules each. The counter-ions are regularly embedded into the crystalline lattice. The conformation of the molecules of all complexes is elongated and symmetric. The thermal gravimetric analysis showed a high stability of all complexes above 200 C. The UV-Vis and fluorescence spectral data of the synthesized compounds were obtained in acetone, benzene, dichloromethane, chloroform, DMA, DMF, DMSO, and THF. The complexes show intensive π-π*, n-π*, and charge-transfer (CT) bands in the range from 200 to 400 nm in all solvents, whereas the ligand shows intensive π-π*, n-π* bands only. A strong red shift (21-31 nm) of the emission band maximum of the complexes is observed upon transition from nonpolar to polar solvents.

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High-spin Fe(III) Schiff based complexes with photoactive ligands. Synthesis, EPR study and magnetic properties

Cited by 8 publications

References 20 publications

Anion Effects on Spin Crossover Systems: From Supramolecular Chemistry to Magnetism

Anion Effects on Spin Crossover Systems: From Supramolecular Chemistry to Magnetism

Dendritic Iron(III) Carbazole Complexes: Structural, Optical, and Magnetic Characteristics

Schiff base complexes with different metals incorporating derivatives of 3,6‐di‐tert‐butylcarbazole

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