One pot obtention of a tetrabutylammonium hydroxide solution for ironporphyrin-OH- interaction studies in organic solvents

Iwamoto, L S; Serra, Osvaldo Antônio; Manso, Cynthia M C P; Iamamoto, Yassuko

doi:10.1590/s0100-40421999000200021

Cited by 5 publications

(4 citation statements)

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“…A source of hydroxide anions was strictly dry acetonitrile solution of labeled tetrabutylammonium hydroxide, prepared from silver(I) oxide monohydrate and tetrabutylammonium iodide ( 17 O labeled water was used for the preparation of Ag 2 O). 84 In order to determine the values needed for the calculation of d 17 O of tetravalent ionic form of boronic acids, the following spectra were recorded:…”

Section: O Imentioning

confidence: 99%

17O NMR studies of boronic acids and their derivatives

et al. 2013

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Section: O Imentioning

confidence: 99%

17O NMR studies of boronic acids and their derivatives

et al. 2013

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“…In contrast, the high-spin signal comparable to a typical nonheme Fe III is relatively broader and less intensive with a g-value shifted from 4.25 to 4.75 likely due to nonheme iron electronic reconfiguration as well as coordination dynamics 39 . This signal is relatively symmetric suggesting OH − ions in association to the fifth and/or sixth coordinates of the nonheme ferric iron 40 . In the latter, the reduced ferrous iron (Fe II ) is usually insensitive to EPR (S = 0 or S = 2), while the appearance of a relatively weak signal indicates a portion of Fe II have oxidized and moved to a different spatial position 35 , 39 , 41 , 42 .…”

Section: Resultsmentioning

confidence: 99%

β-Hydroxylation of α-amino-β-hydroxylbutanoyl-glycyluridine catalyzed by a nonheme hydroxylase ensures the maturation of caprazamycin

et al. 2022

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Caprazamycin is a nucleoside antibiotic that inhibits phospho-N-acetylmuramyl-pentapeptide translocase (MraY). The biosynthesis of nucleoside antibiotics has been studied but is still far from completion. The present study characterized enzymes Cpz10, Cpz15, Cpz27, Mur17, Mur23 out of caprazamycin/muraymycin biosynthetic gene cluster, particularly the nonheme αKG-dependent enzyme Cpz10. Cpz15 is a β-hydroxylase converting uridine mono-phosphate to uridine 5′ aldehyde, then incorporating with threonine by Mur17 (Cpz14) to form 5′-C-glycyluridine. Cpz10 hydroxylates synthetic 11 to 12 in vitro. Major product 13 derived from mutant Δcpz10 is phosphorylated by Cpz27. β-Hydroxylation of 11 by Cpz10 permits the maturation of caprazamycin, but decarboxylation of 11 by Mur23 oriented to muraymycin formation. Cpz10 recruits two iron atoms to activate dioxygen with regio-/stereo-specificity and commit electron/charge transfer, respectively. The chemo-physical interrogations should greatly advance our understanding of caprazamycin biosynthesis, which is conducive to pathway/protein engineering for developing more effective nucleoside antibiotics.

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“…For example, it has been reported that tetramethylammonium hydroxide (TMAOH) can react with CO 2 as a strong base to form tetramethylammonium carbonate . Similarly, TBAOH could react with CO 2 following reaction and serve as a carbon dioxide absorbant: , This reaction consumes hydroxide ions present in solution and introduces some protons. As the concentration of protons increases in the solution, the exchange between TBA + associated with nanosheets and protons in solution is likely because protons are smaller in size and can initiate electrostatically more favorable interactions with the negative nanosheets.…”

Section: Results and Discussionmentioning

confidence: 99%

“…For example, it has been reported that tetramethylammonium hydroxide (TMAOH) can react with CO 2 as a strong base to form tetramethylammonium carbonate. 31 Similarly, TBAOH could react with CO 2 following reaction 1 and serve as a carbon dioxide absorbant: 32,33…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Self-Assembly of Metal Oxide Nanosheets at Liquid–Air Interfaces in Colloidal Solutions

et al. 2016

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The oxide nanosheet concentration at the liquid− air interface (LAI) is a key parameter in the formation of Langmuir−Blodgett (LB) deposited nanosheet films. Knowledge of the oxide nanosheet concentration at the LAI as a function of process conditions is needed to understand the relevant processes and achieve better control over the LB fabrication process. In this study, the concentration of Ti 0.87 O 2 δ− titanate nanosheets at the LAI was investigated by considering the trend in the lift-up point (LUP) in the surface pressure−surface area isotherm of an LB compression process as a function of time and exfoliation agent. The oxide nanosheet concentrations in the bulk solutions were studied using UV−vis spectroscopy. The results show that the restacking process in the bulk solution does not significantly retard the occurrence of nanosheets at the LAI. The nanosheet concentration changes in the bulk and at the LAI occur on different time scales. Short exfoliation times yield higher nanosheet concentrations at the LAI than longer exfoliation times, in contrast to the bulk where the nanosheet concentration increases in the course of time. We found the same behavior for other metal oxide nanosheet solutions, i.e., iron-doped titanate (Ti 0.6 Fe 0.4 O 2 0.4− ) and calcium niobate (Ca 2 Nb 3 O 10 − ) nanosheets. The reason behind this phenomenon is likely related to the high degree of adsorption of surfactant molecules on the nanosheet surface after short exfoliation times.

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One pot obtention of a tetrabutylammonium hydroxide solution for ironporphyrin-OH- interaction studies in organic solvents

Cited by 5 publications

References 0 publications

17O NMR studies of boronic acids and their derivatives

17O NMR studies of boronic acids and their derivatives

β-Hydroxylation of α-amino-β-hydroxylbutanoyl-glycyluridine catalyzed by a nonheme hydroxylase ensures the maturation of caprazamycin

Self-Assembly of Metal Oxide Nanosheets at Liquid–Air Interfaces in Colloidal Solutions

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