Nephelauxetic effect in the lanthanide complexes with methyl acetoacetate

Mishchenko, Artem; Trunova, Elena

doi:10.1080/00387010.2016.1236821

Cited by 2 publications

(1 citation statement)

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“…Also, they are used as antimicrobial, antitumor [16], anticancer [17], antioxidant [18], antiproliferatial [19] and chemotherapeutic agent [20]. Lanthanides and actinides and their complexes have attracted a great interest as a results of their antimicrobial, antioxidant, antitumor, DNA binding, electro-optical, nephelauxetic, luminescent properties [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35]. Pyrrole is important heterocyclic compound, where porphyrins (haem), chlorines (chlorophyll) and corrin (vitamin B12) contain pyrrole ring [36].…”

Section: Introductionmentioning

confidence: 99%

pH-Metric studies of (2-pyrrole)-(5,6-diphenyl-[1,2,4]-triazin-3-yl)hydrazone with inner transition metals

et al. 2020

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The reaction of (2-pyrrole)-(5,6-diphenyl-[1,2,4]-triazin-3-yl)hydrazone with trivalent 4f lanthanide metal ions (La(III), Pr(III), Nd(III), Sm(III), Eu(III), Gd(III), Tb(III), Dy(III), Ho(III), Er(III) and Yb(III)) and 5f actinide metal ion UO 2 (II) has been studied potentiometrically in 75% (v/v) dioxane-water; at 283, 293, 303 and 313K. The ligand behaves as mono-protic species with the dissociation of hydrazo group proton and reacts with metal ion in molar ratio 1:2; M:L in solution. The formation constants were caulculated, which decrease as temprerature increases. The negative values of ΔH  and ΔG° indicate that the complexation process is exothermic and proceeds spontaneously, respectivily. The electrostatic forces are weaker than non-electrostatic forces, where-G°n on is lower than-G°e l. G°e l has negative comparable values and suggests that the complexation process is affected by the temperature and environment. The higher negative value of H  1non than H  2non for UO 2-complex would reflect that the bond strength from ligand to UO 2 ion, which is stronger in the 1 st coordination than the 2 nd coordination.

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Section: Introductionmentioning

confidence: 99%

pH-Metric studies of (2-pyrrole)-(5,6-diphenyl-[1,2,4]-triazin-3-yl)hydrazone with inner transition metals

et al. 2020

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THERMODESTRUCTION OF Lа(III) COORDINATION COMPOUNDS WITH ALIPHATIC Β-Ketoesters

2021

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Mono- and mixed-ligand complexes of La (III) with aliphatic β-ketoesters were synthesized in the solid state. The complexes have the general formulas LаL2OH·H2O (L=meacac, etacac, alacac) and La(meacac)2X·nCH3OH(X = NO3, CH3COO; n = 1, 2). Their composition, structure, and thermal properties were established by chemical and thermal analysis, IR spectroscopy. It is shown that β-ketoesters are coordinated to the La (III) ion bidentate-cyclically into monoligand hydroxocomplexes. Ligand complexes with methylacetoacetate have an oligomeric structure. They consist of cationic fragments [La(meacac)2]+ with bridged connection of the nitrate or acetate anions. The thermal destructions of LaL2OH·H2O (L = meacac, etacac, alacac), La(meacac)2NO3· 2CH3OH and La(meacac)2(CH3COO)·CH3OH were studied for the first time in the helium dynamic atmosphere by TGA-MS in the temperature range of 25–900 °C. Depending on the ligand, dehydratation of the hydroxo-complexes takes place in the 120–180 (meacac), 120–190 (etacac) or 110–160 °C (alacac) temperature range, and the mass loss corresponds with the detachment of one water molecule. Decomposition of mixed-ligand complexes starts with the detachment of methanol in the 60–100 °C range. For La(meacac)2NO3·2CH3OH the decomposition process is attended with oxidation of methanol to carbon dioxide due to reduction of the nitrate-ion to nitrogen dioxide. Further heating to 300–400 °C leads to destruction of organic parts of the complexes attended with the release of low-molecular oxygen-containing organic compounds (aldehydes, ketones, alcohols), carbon dioxide and water. At ~500 °C all the La(III) complexes under study totally decompose, yielding the oxycarbonate La2O2CO3, which was fixed by IR spectroscopy. Under further heating to 850 °С oxycarbonate gradually decomposes to La2O3 liberating CO2.

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Nephelauxetic effect in the lanthanide complexes with methyl acetoacetate

Cited by 2 publications

References 35 publications

pH-Metric studies of (2-pyrrole)-(5,6-diphenyl-[1,2,4]-triazin-3-yl)hydrazone with inner transition metals

pH-Metric studies of (2-pyrrole)-(5,6-diphenyl-[1,2,4]-triazin-3-yl)hydrazone with inner transition metals

THERMODESTRUCTION OF Lа(III) COORDINATION COMPOUNDS WITH ALIPHATIC Β-Ketoesters

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Nephelauxetic effect in the lanthanide complexes with methyl acetoacetate

Cited by 2 publications

References 35 publications

pH-Metric studies of (2-pyrrole)-(5,6-diphenyl-[1,2,4]-triazin-3-yl)hydrazone with inner transition metals

pH-Metric studies of (2-pyrrole)-(5,6-diphenyl-[1,2,4]-triazin-3-yl)hydrazone with inner transition metals

THERMODESTRUCTION OF Lа(III) COORDINATION COMPOUNDS WITH ALIPHATIC Β-Keto­esters

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THERMODESTRUCTION OF Lа(III) COORDINATION COMPOUNDS WITH ALIPHATIC Β-Ketoesters