Chemical functionalization and optical properties of new fluorescent building blocks bearing carbazole moieties

Chervonova, U.V.; Gruzdev, M.S.; Bichan, N.G.; Krestianinov, M.A.

doi:10.1016/j.optmat.2023.114754

Cited by 3 publications

(4 citation statements)

References 48 publications

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“…Schiff bases modified with carbazole fragments were prepared using the condensation reaction of the corresponding amines and substituted aldehydes in solution immediately before the complexation. The synthesis of key precursors of the second generation (G2), Figure 1, is discussed in detail in [13].…”

Section: Preparations 221 Synthesis Of Ligandsmentioning

confidence: 99%

“…It is also worth noting the contribution of the organic component around the metal ion. A comparative analysis of NMR spectroscopy data from the initial aldehyde and amine [13] and the resulting coordination compound G2-[L 2 Fe]NO 3 , Figure 5, shows that the complexes under study do not contain the starting reagents in their composition. This is indicated by the absence of a COH (9.84 ppm) signal from the fragment of salicylic branched aldehyde (Di(CrB)aldehyde), which directly enters into a condensation reaction with the amine (Di(CrB)amine).…”

Section: Spectroscopy Characterizationmentioning

confidence: 99%

“…This is indicated by the absence of a COH (9.84 ppm) signal from the fragment of salicylic branched aldehyde (Di(CrB)aldehyde), which directly enters into a condensation reaction with the amine (Di(CrB)amine). The triplet signal of the amino group of Di(CrB)amine [13] and the resulting G2-[L2Fe]NO3 complex.…”

Section: Spectroscopy Characterizationmentioning

confidence: 99%

“…Figure5 1. H NMR spectra of the initial Di(CrB)aldehyde and Di(CrB)amine[13] and the resulting G2-[L 2 Fe]NO 3 complex.…”

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confidence: 99%

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New Branched Iron(III) Complexes in Fluorescent Environment Created by Carbazole Moieties: Synthesis and Structure, Static Magnetic and Resonance Properties

Starichenko,

Vorobeva,

Gruzdev

et al. 2024

Magnetochemistry

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The branched complexes of Schiff bases with various iron(III) salts, named G2-[L2Fe]+A− (A− is NO3−, Cl−, PF6−), were synthesized using the condensation reaction between carbazole derivatives of salicylic aldehyde and N’-ethylethylenediamine and characterized by various spectroscopic methods (GPC, IR, 1H NMR, UV/Vis). The studies revealed that the coordination of the two ligand molecules to metal occurs through the nitrogen ions and oxygen atom of azomethine to form a homoleptic system. All the synthesized coordination compounds were examined for their thermal, optical, and magnetic features. Static magnetic measurements showed that only G2-[L2Fe]Cl was in a single-phase HS state, whereas the Fe(III) ions of G2-[L2Fe]NO3 and G2-[L2Fe]PF6 at room temperatures were in mixed low-spin (LS, S = 1/2) and high-spin (HS, S = 5/2) states: 58.9% LS/41.1% HS for G2-[L2Fe]NO3, 56.1% LS and 43.9% HS for G2-[L2Fe]PF6. All G2-[L2Fe]+A− complexes demonstrate antiferromagnetic exchange interactions between neighboring Fe(III) ions. The ground spin state at 2.0 K revealed a Brillouin contribution from non-interacting LS ions and a proportion of the HS Fe(III) ions not participating in AFM interactions: 57%, 18%, and 16% for G2-[L2Fe]Cl, G2-[L2Fe]NO3 and G2-[L2Fe]PF6, respectively. EPR measurements confirmed the presence of magnetically active HS and LS states of Fe(III) ions and made it possible to distinguish two HS types-with strong low-symmetry (I-type) and weak, distorted octahedral environments (II-type). It was shown that G2-[L2Fe]+A− complexes are magnetically inhomogeneous and consist of two magnetic sub-lattices: AFM-correlated chains in layers from the I-type HS Fe(III) centers and dynamic short-range AFM ordered LS/II-type HS Fe(III) centers in the paramagnetic phase located between the layers.

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Section: Preparations 221 Synthesis Of Ligandsmentioning

confidence: 99%

Section: Spectroscopy Characterizationmentioning

confidence: 99%

Section: Spectroscopy Characterizationmentioning

confidence: 99%

“…Figure5 1. H NMR spectra of the initial Di(CrB)aldehyde and Di(CrB)amine[13] and the resulting G2-[L 2 Fe]NO 3 complex.…”

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New Branched Iron(III) Complexes in Fluorescent Environment Created by Carbazole Moieties: Synthesis and Structure, Static Magnetic and Resonance Properties

Starichenko,

Vorobeva,

Gruzdev

et al. 2024

Magnetochemistry

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Azomethine Fe³⁺ coordination compounds containing carbazole units: Synthetic approach, spectral characterization, and magnetic studies

Gruzdev,

Chervonova,

Starichenko

et al. 2024

Applied Organom Chemis

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The main aim of our study is to investigate various types of hybrid systems with a paramagnetic iron (III) ion as a core and photoactive derivatives of carbazole at the periphery. We have synthesized a variety of biligand coordination compounds with the composition [FeL2]A (where L is 2‐[2‐[(E)‐[4‐[4‐(3,6‐di‐tert‐butylcarbazol‐9‐yl)benzoyl]oxy‐2‐phenolate]methyleneamino]ethylamino]ethyl 4‐(3,6‐di‐tert‐butylcarbazol‐9‐yl)benzoate, A− is NO3− (I), Cl− (II), PF6− (III)). These systems were studied by superconducting quantum interference device (SQUID) magnetometry and X‐band electron paramagnetic resonance (EPR) spectroscopy. Magnetic measurements revealed mixed spin states (high spin [HS], low spin [LS]) of Fe (III) ions at room temperatures. Estimates of the corresponding spin contributions were made. It was found that all samples exhibit AFM exchange interactions between iron (III) ions. The ground spin state at 2.0 K was established and analyzed. EPR measurements confirmed the HS states of iron (III) and revealed two types of them: with weak distorted and strong low‐symmetry octahedral crystal fields.

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Solvent-free synthesis of polysilane-carbazole – A green route to develop fluorescent polysilanes with amplified emission characteristics via bridge intramolecular charge transfer effect

Sacarescu,

Chibac-Scutaru,

Cojocaru

et al. 2024

Materials Today Chemistry

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Chemical functionalization and optical properties of new fluorescent building blocks bearing carbazole moieties

Cited by 3 publications

References 48 publications

New Branched Iron(III) Complexes in Fluorescent Environment Created by Carbazole Moieties: Synthesis and Structure, Static Magnetic and Resonance Properties

New Branched Iron(III) Complexes in Fluorescent Environment Created by Carbazole Moieties: Synthesis and Structure, Static Magnetic and Resonance Properties

Azomethine Fe³⁺ coordination compounds containing carbazole units: Synthetic approach, spectral characterization, and magnetic studies

Solvent-free synthesis of polysilane-carbazole – A green route to develop fluorescent polysilanes with amplified emission characteristics via bridge intramolecular charge transfer effect

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Chemical functionalization and optical properties of new fluorescent building blocks bearing carbazole moieties

Cited by 3 publications

References 48 publications

New Branched Iron(III) Complexes in Fluorescent Environment Created by Carbazole Moieties: Synthesis and Structure, Static Magnetic and Resonance Properties

New Branched Iron(III) Complexes in Fluorescent Environment Created by Carbazole Moieties: Synthesis and Structure, Static Magnetic and Resonance Properties

Azomethine Fe3+ coordination compounds containing carbazole units: Synthetic approach, spectral characterization, and magnetic studies

Solvent-free synthesis of polysilane-carbazole – A green route to develop fluorescent polysilanes with amplified emission characteristics via bridge intramolecular charge transfer effect

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Azomethine Fe³⁺ coordination compounds containing carbazole units: Synthetic approach, spectral characterization, and magnetic studies