Exploring the Ability of Luminescent Metal Assemblies to Bind and Sense Anionic or Ionizable Analytes A Ru(phen)2bipy-Based Dizinc Complex for Bisphenol A (BPA) Recognition

The synthesis of a new RuII complex, in which the metal is coordinated by two 1,10-phenanthroline ligands and a 2,2′-bipyridyl unit linked, via methylene bridges in its 4 and 4′ positions, to two 1,4,7,10-tetraazacyclododecane (cyclen) macrocycles ([Ru(phen)2L]2+) is reported. Protonation and ZnII binding by [Ru(phen)2L]2+ have been analyzed by potentiometric titration, evidencing the formation of mixed hetero-binuclear and hetero-trinuclear ZnII/RuII complexes. These complexes were tested as bis-phenol A (BPA) binders. Only the dizinc complex with [Ru(phen)2L]2+ is able to bind BPA in aqueous solution, affording a remarkably stable {Zn2[Ru(phen)2L]BPA(H−2)}4+ adduct at neutral pH, in which BPA is bound in its doubly deprotonated form to the two ZnII ions. BPA binding was found to quench the luminescence emission of the RuII(phen)2bipy core. Although the quenching effect is modest, this study demonstrates that appropriately designed dizinc complexes can be used for binding and optical sensing of BPA in water.

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Effective adsorption of bisphenol A from aqueous solution over a novel mesoporous carbonized material based on spent bleaching earth

Environmental Science and Pollution Research ◽

10.1007/s11356-021-13596-0 ◽

2021 ◽

Author(s):

Dongjin Wan ◽

Yao Chen ◽

Yahui Shi ◽

Yongde Liu ◽

Shuhu Xiao

Keyword(s):

Aqueous Solution ◽

Bisphenol A ◽

Bleaching Earth

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Catalytic wet air oxidation of bisphenol A aqueous solution in trickle-bed reactor over single TiO2 polymorphs and their mixtures

Journal of Environmental Chemical Engineering ◽

10.1016/j.jece.2018.03.024 ◽

2018 ◽

Vol 6 (2) ◽

pp. 2148-2158 ◽

Cited By ~ 5

Author(s):

Gregor Žerjav ◽

Renata Kaplan ◽

Albin Pintar

Keyword(s):

Aqueous Solution ◽

Bisphenol A ◽

Catalytic Wet Air Oxidation ◽

Air Oxidation ◽

Wet Air Oxidation ◽

Trickle Bed Reactor ◽

Trickle Bed

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A study of the decomposition behaviour of 12-tungstophosphate heteropolyacid in solution

Canadian Journal of Chemistry ◽

10.1139/v03-129 ◽

2003 ◽

Vol 81 (10) ◽

pp. 1044-1050 ◽

Cited By ~ 68

Author(s):

Zhirong Zhu ◽

Ruan Tain ◽

Colin Rhodes

Keyword(s):

Aqueous Solution ◽

High Performance Liquid Chromatography ◽

Liquid Chromatography ◽

Potentiometric Titration ◽

Inductively Coupled Plasma ◽

High Performance ◽

Atomic Emission ◽

Inductively Coupled ◽

Vis Spectroscopy ◽

Decomposition Behaviour

In this paper, the decomposition of H3PW12O40 in aqueous solution or in mixed solutions of waterethanol or wateracetone is investigated by potentiometric titration and 31P NMR. Identification of the products from H3PW12O40 decomposition over a pH range of 112 was achieved using preparation high performance liquid chromatography (Pre-HPLC) combined with IR, UVvis spectroscopy, and inductively coupled plasma atomic emission spectroscopy (ICP). It is found that H3PW12O40 in aqueous solution decomposes in a stepwise fashion with increasing pH, with the following solution compositions: [PW12O40]3 (at pH ~ 1) [Formula: see text] [PW12O40]3 + [P2W21O71]6 + [PW11O39]7 (at pH 2.2) [Formula: see text] [PW12O40]3 + [P2W21O71]6 + [PW11O39]7 + [P2W18O62]6 + [P2W19O67]10 (at pH 3.5) [Formula: see text] [P2W21O71]6 + [PW11O39]7 + [P2W18O62]6 (at pH 5.4) [Formula: see text] [PW9O34]9 (at pH 7.3) [Formula: see text] PO43 + WO42 (pH > 8.3). In the first stages at pH < 8, H3PW12O40 decomposes partially with removal of W=O units. In the second stage at pH > 8, tungstophosphoric completely decomposes to PO43. In contrast, the decomposition of H3PW12O40 is reduced, or the stability of the [PW12O40]3 anion is enhanced, in ethanolwater or acetone solution at pH < 8. Key words: 12-tungstophosphate heteropolyacid, decomposition behaviour, potentiometric titration, 31P NMR, preparation high performance liquid chromatography.

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Kinetics, stoicheiometry, and mechanism in the bromination of aromatic heterocycles. I. Aqueous bromination of pyrazole, 1-methylpyrazole, and 3,5-dimethylpyrazole

Australian Journal of Chemistry ◽

10.1071/ch9711413 ◽

1971 ◽

Vol 24 (7) ◽

pp. 1413 ◽

Cited By ~ 11

Author(s):

BE Boulton ◽

BAW Coller

Keyword(s):

Aqueous Solution ◽

Potentiometric Titration ◽

Electrode Potential ◽

Rate Coefficients ◽

Molecular Bromine ◽

Aromatic Heterocycles ◽

Dilute Aqueous Solution ◽

Direct Attack ◽

Rate Behaviour ◽

Bromide Solutions

A procedure is described for monitoring the reactivity of a substrate towards bromine in aqueous bromide solutions, as a function of extent of reaction, by following the changes of electrode potential with time in the intervals between successive periods of electrolysis. �� The title compounds show 1 : 1 stoicheiometry with substitution in the 4-position. The observed rate behaviour may be understood in terms of direct attack by molecular bromine on the neutral substrate molecules, rate coefficients for dilute aqueous solution at 25�C being: �� k20(Br2+pyrazole) = 3.8x105 dm3 mol-1 s-1, kH/kD = 1.39;�� k20(Br2+1.methylpyrazole) = 8.0x105 dm3 mol-1 s-1;�� k20(Br2+3,5-dimethylpyrazole) = 1.4x109 dm3 mol-1 s-1, kH/kD = 1.08 Values of pKa(pyrazole-H+) = 2.58 and pKa(3,5-dimethylpyrazole-H+) = 4.11 were determined by potentiometric titration methods.

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