Metal-Ligand Electronic Interactions in Mononuclear and Dinuclear Triethylenetetraminecobalt(III) Complexes Containing the Anion of Quinizarin (1,4-Dihydroxy-9,10-anthraquinone)

1993 ◽  
Vol 58 (1) ◽  
pp. 62-70 ◽  
Author(s):  
Edward A. Robinson ◽  
Joseph E. Earley
Keyword(s):  
Aqueous Solution ◽  
Significant Interaction ◽  
Electronic Interactions ◽  
Cyclical Voltammetry ◽  
Conjugate Acid ◽  
Metal Ligand

1,4-Dihydroxy-9,10-anthraquinonatotriethylenetetraminecobalt(III) cation and its conjugate acid and the tetrapositive dinuclear μ-1,4-dihydroxy-9,10-anthraquinonatotriethylenetetraminecobalt(III) cation have been prepared in aqueous solution and characterized by spectroscopy and cyclical voltammetry. Both spectra and electrochemistry indicate that there is significant interaction between ligand-centered orbitals and metal-centered orbitals in all three species.

scholarly journals Self-Assembled Nanomaterials Based on Complementary Sn(IV) and Zn(II)-Porphyrins, and Their Photocatalytic Degradation for Rhodamine B Dye

Molecules ◽  
2021 ◽  
Vol 26 (12) ◽  
pp. 3598
Author(s):  
Nirmal K. Shee ◽  
Hee-Joon Kim
Keyword(s):  
Aqueous Solution ◽  
Visible Light Irradiation ◽  
Rhodamine B ◽  
Self Assembly ◽  
The Self ◽  
Assembly Process ◽  
Absorption Bands ◽  
Ligand Coordination ◽  
Rhodamine B Dye ◽  
Metal Ligand

A series of porphyrin triads (1–6), based on the reaction of trans-dihydroxo-[5,15-bis(3-pyridyl)-10,20-bis(phenyl)porphyrinato]tin(IV) (SnP) with six different phenoxy Zn(II)-porphyrins (ZnLn), was synthesized. The cooperative metal–ligand coordination of 3-pyridyl nitrogens in the SnP with the phenoxy Zn(II)-porphyrins, followed by the self-assembly process, leads to the formation of nanostructures. The red-shifts and remarkable broadening of the absorption bands in the UV–vis spectra for the triads in CHCl3 indicate that nanoaggregates may be produced in the self-assembly process of these triads. The emission intensities of the triads were also significantly reduced due to the aggregation. Microscopic analyses of the nanostructures of the triads reveal differences due to the different substituents on the axial Zn(II)-porphyrin moieties. All these nanomaterials exhibited efficient photocatalytic performances in the degradation of rhodamine B (RhB) dye under visible light irradiation, and the degradation efficiencies of RhB in aqueous solution were observed to be 72~95% within 4 h. In addition, the efficiency of the catalyst was not impaired, showing excellent recyclability even after being applied for the degradation of RhB in up to five cycles.

Aluminium(III) and Iron(III) 1,2-Diphenolato Complexes: a Potentiometric Study

1985 ◽  
Vol 38 (5) ◽  
pp. 659 ◽  
Author(s):  
JA Kennedy ◽  
HKJ Powell
Keyword(s):  
Aqueous Solution ◽  
Potentiometric Titration ◽  
Protocatechuic Acid ◽  
Acid System ◽  
Experimental Conditions ◽  
Potentiometric Study ◽  
Hydroxo Complexes ◽  
Equilibrium Reactions ◽  
Ternary Metal ◽  
Metal Ligand

The equilibrium reactions between aluminium(III) and the phenols catechol (LH2), protocatechuic acid (LH3) and catechin (LH4), and between iron(III) and protocatechuic acid have been studied by potentiometric titration in aqueous solution, I 0.10M ( KCl ), 25°C. Stability constants are reported for the mononuclear diphenolato complexes AlLHn-2, Al(LHn-2)2and Al(LHn-2)3, and the hydroxo complexes Al(OH)LHn-2 and Al(OH)(LHn-2)2, n = 2 ( catechol ) or 4 ( catechin ). For protocatechuic acid, the carboxylate -coordinated species lLH22+ and the species AlLH + (carboxyl- protonated ) are also postulated. Analogous species were characterized for the iron(III)- protocatechuic acid system. Stoichiometric end-points were obtained only if an excess of ligand was used (L/M > 4). Monomeric and polymeric aluminium- hydroxo species and ternary metal- ligand - hydroxo species were found to be unimportant under the experimental conditions employed.

Stereoselective synthesis of cobalt(III) anionic complexes with chiral pyruvylaminoacid oximes and metal–ligand interactions in aqueous solution

Polyhedron ◽  
2007 ◽  
Vol 26 (12) ◽  
pp. 2894-2900 ◽  
Author(s):  
Aleksander Kufelnicki ◽  
Igor O. Fritsky ◽  
Tatiana Yu. Sliva ◽  
Inna F. Golovaneva ◽  
Rostislav D. Lampeka
Keyword(s):  
Aqueous Solution ◽  
Stereoselective Synthesis ◽  
Ligand Interactions ◽  
Anionic Complexes ◽  
Metal Ligand

scholarly journals The Estimation of Acidic Behavior of Wood by Treatment with Aqueous Solution

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Güneş Uçar ◽  
Mualla Balaban Uçar
Keyword(s):  
Aqueous Solution ◽  
Wood Species ◽  
Ph Value ◽  
Phosphate Solution ◽  
Weak Acids ◽  
New Approach ◽  
Conjugate Acid ◽  
Phosphate Solutions

As a new approach, the acidity that wood exhibits under moderate conditions is assayed by stimulated dissociation of weak wood acids in lightly basic secondary phosphate solutions. To assure a sufficient dissociation of hardly soluble weak acids in the solution, the amount of wood suspended in solutions should be small but vary depending on the degree of acidity of wood species. However, the difficulties are associated with the titration of very dilute acids limiting the precision of the measurement. If the disintegrated wood is suspended in a secondary phosphate solution, the weak woods acids form the conjugate acid from secondary phosphate resulting in a pH fall of the solution. The decrease in the pH value in phosphate solution, which depends on the wood acidity, can be evaluated to estimate the acidity arising from wood under moderate conditions.

A Highly Selective and Sensitive Fluorescent Probe Based on Quinolone Derivative for Hg2+ in Aqueous Solution

2012 ◽  
Vol 549 ◽  
pp. 229-233
Author(s):  
Juan Juan Tian ◽  
Xin Zhou ◽  
Hui Juan Hao ◽  
Xue Wu
Keyword(s):  
Aqueous Solution ◽  
Fluorescent Probe ◽  
Limit Of Detection ◽  
Transition Metal Ions ◽  
Quinoline Derivative ◽  
Ligand Complex ◽  
Quinolone Derivative ◽  
Ph Range ◽  
Metal Ligand ◽  
Tof Ms

A new fluorescent probe, quinoline derivative DPQ bearing a methyl pyrrolidine-1-carbodithioate group, was synthesized and characterized by IR, Tof-MS and NMR. Its fluorescent behaviors toward transition metal ions were investigated. The results indicate that DPQ shows unique selective and high sensitive for Hg2+ in aqueous solution with a broad pH range 4-10. DPQ forms a 1:2 metal-ligand complex with Hg2+ ions with a limit of detection as low as 1.7×10-6 mol/L.

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