“…Furthermore, in some cases, additional bands appear. Similar changes were observed in the spectra of complexes and (L = L1–L6) [ 29 , 30 ].…”
Section: Resultssupporting
confidence: 74%
“…A similar example is the synthesis of Mn(II)(salen) complexes on porous amino silica gel (Si-NH 2 ) [ 17 ]. A comparison of the spectral data for similar Cu(II) and Co(II) [ 29 , 30 ] complexes and complexes permits to conclude that, for manganese(II), polyhedron N 2 O 2 also realizes in the ligand field of L1–L5 (Scheme 1 ). Scheme 1 Structure of the manganese(II) complexes with ligands L1-L5 …”
Section: Resultsmentioning
confidence: 97%
“…Analysis of data obtained as a result of the study of catalytic properties of 3d metal complexes with Schiff bases in the oxidation of organic compounds [ 15 , 17 , 18 , 20 – 22 , 24 , 26 – 28 ] and decomposition of ozone [ 29 , 30 ] leads to the conclusion that the catalytic activity of the immobilized metal complexes in redox reactions can be controlled by the following: (i) optimization of the structural characteristics of the carrier and the method of synthesis for obtaining the homogeneous structure and composition of immobilized complexes, (ii) changes in the geometric configuration of an immobilized complex, and (iii) redistribution of the electron density at the central atom and the ligand leading to a significant change in redox potential of M n+1 /M n+ pair and, hence, to the reactivity and catalytic activity of the complexes.…”
In this article, we submit the description of synthesis and identification of manganese(II) complexes with pyrogenic nanosilica-immobilized (dav = 10 nm; Ssp = 290 m2/g) hydroxyaldimine ligands : salicilaldiminopropyl (L1); 5-bromosalicilaldiminopropyl (L2); 2-hydroxynaphtaldiminopropyl (L3); 2-hydroxy-3-methoxybenzaldiminopropyl (L4); 2-hydroxy-3,5-dichloroacetophenoniminopropyl (L5); and 4-hydroxy-3-methoxybenzaldiminopropyl (L6). The ligands and complexes were characterized by UV-VIS and IR spectrometry. Nanocomposites consisting of complexes showed a high catalytic activity in low-temperature ozone decomposition in the range of concentrations between 2.1 × 10−6 and 8.4 × 10−6 mol/l. The number of catalytic cycles increased for isostructural pseudotetrahedral complexes (L1–L5) in the following order: Mn(L3)2 >> Mn(L4)2 > Mn(L1)2 > Mn(L2)2 > Mn(L5)2. In the case of pseudooctahedral complexes with L6, the change of coordination polyhedral does not influence the kinetics and stoichiometric parameters of the reaction.
“…Furthermore, in some cases, additional bands appear. Similar changes were observed in the spectra of complexes and (L = L1–L6) [ 29 , 30 ].…”
Section: Resultssupporting
confidence: 74%
“…A similar example is the synthesis of Mn(II)(salen) complexes on porous amino silica gel (Si-NH 2 ) [ 17 ]. A comparison of the spectral data for similar Cu(II) and Co(II) [ 29 , 30 ] complexes and complexes permits to conclude that, for manganese(II), polyhedron N 2 O 2 also realizes in the ligand field of L1–L5 (Scheme 1 ). Scheme 1 Structure of the manganese(II) complexes with ligands L1-L5 …”
Section: Resultsmentioning
confidence: 97%
“…Analysis of data obtained as a result of the study of catalytic properties of 3d metal complexes with Schiff bases in the oxidation of organic compounds [ 15 , 17 , 18 , 20 – 22 , 24 , 26 – 28 ] and decomposition of ozone [ 29 , 30 ] leads to the conclusion that the catalytic activity of the immobilized metal complexes in redox reactions can be controlled by the following: (i) optimization of the structural characteristics of the carrier and the method of synthesis for obtaining the homogeneous structure and composition of immobilized complexes, (ii) changes in the geometric configuration of an immobilized complex, and (iii) redistribution of the electron density at the central atom and the ligand leading to a significant change in redox potential of M n+1 /M n+ pair and, hence, to the reactivity and catalytic activity of the complexes.…”
In this article, we submit the description of synthesis and identification of manganese(II) complexes with pyrogenic nanosilica-immobilized (dav = 10 nm; Ssp = 290 m2/g) hydroxyaldimine ligands : salicilaldiminopropyl (L1); 5-bromosalicilaldiminopropyl (L2); 2-hydroxynaphtaldiminopropyl (L3); 2-hydroxy-3-methoxybenzaldiminopropyl (L4); 2-hydroxy-3,5-dichloroacetophenoniminopropyl (L5); and 4-hydroxy-3-methoxybenzaldiminopropyl (L6). The ligands and complexes were characterized by UV-VIS and IR spectrometry. Nanocomposites consisting of complexes showed a high catalytic activity in low-temperature ozone decomposition in the range of concentrations between 2.1 × 10−6 and 8.4 × 10−6 mol/l. The number of catalytic cycles increased for isostructural pseudotetrahedral complexes (L1–L5) in the following order: Mn(L3)2 >> Mn(L4)2 > Mn(L1)2 > Mn(L2)2 > Mn(L5)2. In the case of pseudooctahedral complexes with L6, the change of coordination polyhedral does not influence the kinetics and stoichiometric parameters of the reaction.
1 Одесский национальный университет имени И.И. Мечникова, кафедра неорганической химии и химической экологии, ул. Дворянская, 2, Одесса, 65082. Е-mail: tlr@onu.edu.ua 2 Физико-химический институт защиты окружающей среды и человека, ул. Преображенская, 3, Одесса, 65082 3 Физико-химический институт им. А.В. Богатского НАН Украины, Люстдорфская дорога, 86, Одесса, 65080, Украина
ИССЛЕДОВАНИЕ МЕТОДАМИ ИК-СПЕКТРОСКОПИИ И СПЕКТРОСКОПИИ ДИФФУЗНОГО ОТРАЖЕНИЯ КЛИНОПТИЛОЛИТА, МОДИФИЦИРОВАННОГО ИОНАМИ ВОДОРОДА, ПАЛЛАДИЯ(ІІ) И МЕДИ(ІІ)Методами ИК-спектроскопии и спектроскопии диффузного отражения показано, что влияние концентрации азотной кислоты (0,25-3М), используемой для кислотнотермального модифицированния отечественного клиноптилолита, на спектральные характеристики носителя и закрепленных биметалльных палладий-медных комплексов проявляется существенно при С HNO 3 ≥1,0 моль/л.Ключевые слова: клиноптилолит, кислотное модифицирование, ИК-спектроскопия, спектроскопия диффузного отражения.
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