Stability of bismuth(III), indium(III), lead(II), and cadmium(II) monocomplexes with selenourea and thiourea

Головнев, Н. Н.; Leshok, A. A.; Novikova, Galina V.; Петров, А. И.

doi:10.1134/s0036023610010225

Cited by 6 publications

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“…39 The formation constant for the 1:1 complex between cadmium(II) and SeU was recently determined to be log β 1 = 2.11 ± 0.04 in 0.5 mol dm -3 HClO 4 and ionic strength I = 1.0 (NaClO 4 ) at 298 K using UV- vis . spectroscopy, 40 which differs from the previously reported value log β 1 = 0.9 (log β 2 = 3.7) using a cadmium amalgam electrode. 41 …”

Section: Introductioncontrasting

confidence: 93%

“…38 A polarographic study showed that Cd(II) ions form a selenourea complex with limited solubility in deaerated water with [Cd 2+ ] = 0.01 mM. 39 The formation constant for the 1:1 complex between cadmium(II) and SeU was recently determined to be log β 1 = 2.11 ± 0.04 in 0.5 mol dm −3 HClO 4 and ionic strength I = 1.0 (NaClO 4 ) at 298 K using UV−vis spectroscopy, 40 which differs from the previously reported value log β 1 = 0.9 (log β 2 = 3.7) using a cadmium amalgam electrode. 41 In the current study, we compared the complex formation of cadmium(II) ions with selenourea and thiourea as ligands, keeping C Cd(II) = 0.1 mol dm −3 and varying the mole ratios SeU/Cd(II) from 1.0 to 5.0 and TU/Cd(II) from 1.0 to 20.0.…”

Section: ■ Introductionmentioning

confidence: 99%

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Cadmium(II) Complex Formation with Selenourea and Thiourea in Solution: An XAS and ¹¹³Cd NMR Study

2012

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The complexes formed in methanol solutions of Cd(CF3SO3)2 with selenourea (SeU) or thiourea (TU), for thiourea also in aqueous solution, were studied by combining 113Cd NMR and X-ray absorption spectroscopy. At low temperature (~200 K) distinct 113Cd NMR signals were observed, corresponding to CdLn2+ species (n = 0 - 4, L = TU or SeU) in slow ligand exchange. Peak integrals were used to obtain the speciation in the methanol solutions, allowing stability constants to be estimated. For cadmium(II) complexes with thione (C=S) or selone (C=Se) groups coordinated in Cd(S/Se)O5 or Cd(S/Se)2O4 (O from MeOH or CF3SO3-) environments the 113Cd chemical shifts were quite similar, within 93-97 ppm and 189 – 193 ppm, respectively. However, the difference in the chemical shift for the Cd(SeU)42+ (578 pm) and Cd(TU)42+ (526 ppm) species, with CdSe4 and CdS4 coordination, respectively, shows less chemical shielding for the coordinated Se atoms than for S, in contrast to the common trend with increasing shielding in the order: O > N > Se >S. In solutions dominated by mono- and tetra-thiourea / selenourea complexes, their coordination and bond distances could be evaluated by Cd K-edge extended X-ray absorption fine structure (EXAFS) spectroscopy. At ~200 K and high excess of thiourea a minor amount (up to ~30%) of [Cd(TU)5-6]2+ species was detected by an upfield shift of the 113Cd NMR signal (up to 423 ppm) and an amplitude reduction of the EXAFS oscillation. The amount was estimated by fitting linear combinations of simulated EXAFS spectra for [Cd(TU)4]2+ and [Cd(TU)6]2+ complexes. At room temperature, [Cd(TU)4]2+ was the highest complex formed, also in aqueous solution. Cd L3-edge X-ray absorption near edge structure (XANES) spectra of cadmium(II) thiourea solutions in methanol were used to follow changes in the CdSxOy coordination at room temperature. The correlations found from the current and previous studies between 113Cd NMR chemical shifts and different Cd(II) coordination environments are generally useful for evaluating cadmium coordination to thione-containing or Se-donor ligands in biochemical systems or for monitoring speciation in solution.

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confidence: 93%

Section: ■ Introductionmentioning

confidence: 99%

Cadmium(II) Complex Formation with Selenourea and Thiourea in Solution: An XAS and ¹¹³Cd NMR Study

2012

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A simple template-free bioinspired route of 1D Bi2S3 nanorods synthesis for electrochemical CO2 reduction to formate

Chowdhury

Bhan

Peela

et al. 2023

Journal of Industrial and Engineering Chemistry

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Ionic liquid–modified cellulosic hydrogels for loading and sustained release of selenourea: an ensuing inhibition of tyrosinase activity

Santra

Sen

2020

Materials Today Chemistry

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Stability of bismuth(III), indium(III), lead(II), and cadmium(II) monocomplexes with selenourea and thiourea

Cited by 6 publications

References 4 publications

Cadmium(II) Complex Formation with Selenourea and Thiourea in Solution: An XAS and ¹¹³Cd NMR Study

Cadmium(II) Complex Formation with Selenourea and Thiourea in Solution: An XAS and ¹¹³Cd NMR Study

A simple template-free bioinspired route of 1D Bi2S3 nanorods synthesis for electrochemical CO2 reduction to formate

Ionic liquid–modified cellulosic hydrogels for loading and sustained release of selenourea: an ensuing inhibition of tyrosinase activity

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Stability of bismuth(III), indium(III), lead(II), and cadmium(II) monocomplexes with selenourea and thiourea

Cited by 6 publications

References 4 publications

Cadmium(II) Complex Formation with Selenourea and Thiourea in Solution: An XAS and 113Cd NMR Study

Cadmium(II) Complex Formation with Selenourea and Thiourea in Solution: An XAS and 113Cd NMR Study

A simple template-free bioinspired route of 1D Bi2S3 nanorods synthesis for electrochemical CO2 reduction to formate

Ionic liquid–modified cellulosic hydrogels for loading and sustained release of selenourea: an ensuing inhibition of tyrosinase activity

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Product

Resources

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Cadmium(II) Complex Formation with Selenourea and Thiourea in Solution: An XAS and ¹¹³Cd NMR Study

Cadmium(II) Complex Formation with Selenourea and Thiourea in Solution: An XAS and ¹¹³Cd NMR Study