New coordination compounds of Cr(III) used in leather tanning

Crudu, Marian; Sibiescu, Doina; Roşca, Ioan; Sutiman, Daniel; Vizitiu, Mihaela; Apostolescu, Gabriela

doi:10.1117/12.823638

Cited by 3 publications

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“…domain provide important information about the correlation of electronic transition type of the studied complexes by the structural and electronic changes 17,18 induced by the present of the ligand N-hydroxy-succinimide in the coordination sphere of the metal cations. The electronic transitions observed are due to metal cations (d-d), interligand transitions (n-π*, π-π*; the n-σ* şi σ-σ* not found 50000-32000 cm -1 range) and with charge transfer of M-L (generally d-π*).…”

Section: Resultsmentioning

confidence: 99%

The study of new complex compounds of Ni (II) and Co (II) with N- hydroxy-succinimide and their potential applications as sensors

et al. 2010

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In this paper, the study of obtaining new coordination compounds of Ni (II) and Co(II) using as ligand, N-hydroxy-succinimide, was presented. Also, the stability constants of these compounds in aqueous medium were determined.The obtaining conditions and the stability of the new compounds were accomplished in aqueous solutions using characteristic methods for coordination compounds: pH-metry, conductometry and UV-VIS absorption spectroscopy. The combination ratios and the stability constants were determined with methods characteristic for studies in solutions. From experimental data resulted that the combination ratio of central metallic atoms with the ligand N-hydroxy-succinimide was: 1:1 and respectively 1:2. In the experiments were used salts of NiCl 2 ·6H 2 O and CoCl 2 ·6H 2 O.The optimal domain of pH stability of the studied compounds is limited between 5.74 -5.86 for Co-N-hydroxy-succinimide (for molar ratio 1:1 and 1:2) and respectively 5.69 -5.87 for Ni-N-hydroxysuccinimide(for molar ratio 1:1 and 1:2, too).It is important to mention that these compounds were used with very good results in determination of wastewaters from textile, metallurgical, chemical and food industry.Complexion reactions with this ligand are very sensitive for the cations in this paper mentioned. Therefore it is used most often with success in analytical chemistry and also it is posibil to use as sensors.The new complex compounds has electronics transitions at λ = 517 nm for both complexes Co-Nhydroxy-succinimide at molar ratio 1:1 and 1:2 and also at the same λ = 397nm for Ni-N-hydroxysuccinimide at molar ratio 1:1 and 1:2.These complexes compounds was separated and recrystallized from aqueous solution. From the spectrophotometric data it was determined the type and the nature of the electronics transitions by Dq parameters.

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Section: Resultsmentioning

confidence: 99%

The study of new complex compounds of Ni (II) and Co (II) with N- hydroxy-succinimide and their potential applications as sensors

et al. 2010

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Cochenille red dye decoloration and chromate reduction simultaneously in acid medium

Sibiescu¹,

Vizitiu²

2018

Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies IX

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Complexation of Iron(iii) With TSC and FTSC in H2so4 Solutions of Variable Composition

Bobokalonov,

Hakimov,

Safarmamadzoda

et al. 2024

tnusns

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The process of complex formation of iron (III) with thiosemicarbazide and 1-formyl-3-thiosemicarbazide in H2SO4 solutions of various concentrations was studied using the potentiometric method. The stability constants of the resulting complexes were calculated, and the ionization constants of the ligands were estimated under the same conditions. It was shown that the stepwise nature of complex formation does not depend on the concentration of hydrogen ions. However, the stability of the complexes decreases with increasing pH. A study of the complex formation of iron(III) with thiosemicarbazide and its acyl derivative showed that there are both similarities and differences in the nature of complex formation. Both ligands react with iron(III) in a stepwise manner, forming stable complexes. With increasing temperature, the stability of the complexes increases. Changing the ionic strength of the solution and the concentration of H2SO4 equally affect the stability of the complexes. At the same time, moving from thiosemicarbazide to 1-formyl-3-thiosemicarbazide, the number of particles formed in the solution decreases, and the stability of the complexes decreases.

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New coordination compounds of Cr(III) used in leather tanning

Cited by 3 publications

References 0 publications

The study of new complex compounds of Ni (II) and Co (II) with N- hydroxy-succinimide and their potential applications as sensors

The study of new complex compounds of Ni (II) and Co (II) with N- hydroxy-succinimide and their potential applications as sensors

Cochenille red dye decoloration and chromate reduction simultaneously in acid medium

Complexation of Iron(iii) With TSC and FTSC in H2so4 Solutions of Variable Composition

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