Manganese(II) complexes of 2,3,5,6-tetra-(2-pyridyl)pyrazine – Syntheses, crystal structures, spectroscopic, magnetic and catalytic properties

Machura, B.; Palion, J.; Mroziński, Jerzy; Kalińska, B.; Amini, Mojtaba; Najafpour, Mohammad Mahdi; Kruszyński, Rafał

doi:10.1016/j.poly.2013.01.015

Cited by 27 publications

(8 citation statements)

References 60 publications

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“…As far as we know, there are no reports concerning the formation constants of the manganese(II) complexes with pyrazine, quinoxaline or phenazine in methanol or any other solvent. Nevertheless, a few manganese(II) complexes with pyrazine- [ 26 , 27 , 28 , 29 ], quinoxaline- [ 30 , 31 , 32 ] or phenazine- [ 33 , 34 ] based ligands have been reported before. The electronic spectra of the methanol solutions of manganese(II)–pyrazine complexes are shown in Figure S1 , those for the manganese(II)–quinoxaline complex are shown in Figure S2 and those for the manganese(II)–phenazine complex are shown in Figure S3 .…”

Section: Resultsmentioning

confidence: 99%

Stability of Manganese(II)–Pyrazine, –Quinoxaline or –Phenazine Complexes and Their Potential as Carbonate Sequestration Agents

et al. 2022

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Carbonate sequestration technology is a complement of CO2 sequestration technology, which might assure its long-term viability. In this work, in order to explore the interactions between Mn2+ ion with several ligands and carbonate ion, we reported a spectrophotometric equilibrium study of complexes of Mn2+ with pyrazine, quinoxaline or phenazine and its carbonate species at 298 K. For the complexes of manganese(II)–pyrazine, manganese(II)–quinoxaline and manganese(II)–phenazine, the formation constants obtained were log β110 = 4.6 ± 0.1, log β110 = 5.9 ± 0.1 and log β110 = 6.0 ± 0.1, respectively. The formation constants for the carbonated species manganese(II)–carbonate, manganese(II)–pyrazine–carbonate, manganese(II)–quinoxaline–carbonate and manganese(II)–phenazine–carbonate complexes were log β110 = 5.1 ± 0.1, log β110 = 9.8 ± 0.1, log β110 = 11.7 ± 0.1 and log β110 = 12.7 ± 0.1, respectively. Finally, the individual calculated electronic spectra and its distribution diagram of these species are also reported. The use of N-donor ligand with π-electron-attracting activity in a manganese(II) complex might increase its interaction with carbonate ions.

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Section: Resultsmentioning

confidence: 99%

Stability of Manganese(II)–Pyrazine, –Quinoxaline or –Phenazine Complexes and Their Potential as Carbonate Sequestration Agents

et al. 2022

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“…In order to gain insight into the oxidation states and electronic configuration of the metal centers, magnetic susceptibility studies were completed for both [Mn III Mn II 3 (Pm 2 ImAm) 3 Cl 6 ] and [Fe III 4 (Pm 2 ImAm) 3 Cl 9 ] ; full experimental details are provided below ( see experimental section ). For completeness, magnetic susceptibility studies were also performed on [Mn II 2 ( µ ‐Cl) 2 (Pm 2 ImAm) 2 Cl 2 ] , revealing characteristic behavior for a high spin dinuclear Mn II complex (Figure ) . The variable temperature magnetic susceptibility measurements of [Mn II 2 ( µ ‐Cl) 2 (Pm 2 ImAm) 2 Cl 2 ] yielded a χT product of 8.71 cm 3 K mol –1 at 300 K ( g exp = 1.98), indicative of two non‐interacting S = 5/2 ions ( χT calc = 8.75 cm 3 K mol –1 , assuming g = 2.00).…”

Section: Resultsmentioning

confidence: 99%

Rational Design of Tetranuclear Complexes Employing N‐Imidoylamidine Based Ligands

et al. 2019

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Ligands such as N‐2‐pyrimidylimidoyl‐2‐pyrimidylamidine (Pm2ImAm) possess both a bidentate and tridentate coordination site within a single ligand framework. Taking advantage of this, two tetranuclear complexes with manganese ([MnIIIMnII3(Pm2ImAm)3Cl6]) and iron ([FeIII4(Pm2ImAm)3Cl9]) have been isolated, characterized by single‐crystal X‐ray analysis, and their magnetic properties have been investigated through SQUID magnetometry and Mössbauer spectroscopy. As well, a mononuclear ([FeIII(Pm2ImAm)Cl3]) and binuclear ([MnII2(µ‐Cl)2(Pm2ImAm)2Cl2]) complex employing this ligand framework were also isolated, characterized by single‐crystal X‐ray analysis and their magnetic properties were investigated. For comparison purposes, the previously reported mononuclear complexes [MnIII(Py2ImAm)3] and [FeIII(Py2ImAm)3] were also probed here via SQUID magnetometry due to the similarities between these mononuclear systems and fragments of the tetranuclear complexes. Through this approach, clear interpretation of the magnetic properties in [MnIIIMnII3(Pm2ImAm)3Cl6] and [FeIII4(Pm2ImAm)3Cl9] was achieved. These results reveal that employing our N‐imidoylamidine ligands facilitates the rational design of polynuclear complexes with differing metal ion spin states.

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“…Fourier transform infrared (FT-IR) spectra were obtained with a Nicolet spectrometer (KBr). 1 H NMR and 13 C NMR spectra were recorded with a Bruker DRX500 spectrometer. X-ray diffraction (XRD) was conducted using a Bruker D8 Advance instrument.…”

Section: Experimental General Remarksmentioning

confidence: 99%

“…Hanhan et al prepared binuclear Pd(II) complex catalysts for Suzuki coupling in water . Meanwhile, there are many transition metal Schiff base complexes, such as Fe, V, Cu, Co, Ag, Pd and Mn, that are widely used in catalytic oxidation of alcohols. Although these homogeneous transition metal complexes provide satisfying outcomes in the oxidation of alcohols to corresponding carbonyl compounds, they are still more or less associated with problems including contamination of reaction products and difficulty of separation .…”

Section: Introductionmentioning

confidence: 99%

A new magnetic nanoparticle‐supported Schiff base complex of manganese: an efficient and recyclable catalyst for selective oxidation of alcohols

Zhou

Wan

Yuan

et al. 2016

Applied Organom Chemis

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A new magnetic nanoparticle-supported Schiff base complex of manganese was prepared via the copper-catalyzed 'click' reaction of an aminosalicylidene manganese complex bearing terminal alkynyl with azide-functionalized shell-core magnetic nanoparticles. The as-prepared catalyst was applied in the oxidation of alcohols to corresponding aldehydes or ketones with high yield and selectivity when the reaction was carried out in dimethylsulfoxide at 110°C for 4 h using tert-butyl hydroperoxide as oxidant. Moreover, the catalyst can be easily separated from the reaction mixture using an external magnet and reused five times with no significant loss of catalytic activity.

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Manganese(II) complexes of 2,3,5,6-tetra-(2-pyridyl)pyrazine – Syntheses, crystal structures, spectroscopic, magnetic and catalytic properties

Cited by 27 publications

References 60 publications

Stability of Manganese(II)–Pyrazine, –Quinoxaline or –Phenazine Complexes and Their Potential as Carbonate Sequestration Agents

Stability of Manganese(II)–Pyrazine, –Quinoxaline or –Phenazine Complexes and Their Potential as Carbonate Sequestration Agents

Rational Design of Tetranuclear Complexes Employing N‐Imidoylamidine Based Ligands

A new magnetic nanoparticle‐supported Schiff base complex of manganese: an efficient and recyclable catalyst for selective oxidation of alcohols

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