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Metal/Metal Redox Isomerism Governed by Configuration.

ABSTRACT: A pair of diastereomeric dinuclear complexes, [Tp'(CO)BrW{?-?² -C,C'-?² -S,P-C₂ (PPh₂ )S}Ru(?⁵ -C₅ H₅ )(PPh₃ )], in which W and Ru are bridged by a phosphinyl(thiolato)alkyne in a side-on carbon P,S-chelate coordination mode, were synthesized, separated and fully characterized. Even though the isomers are similar in their spectroscopic properties and redox potentials, the like-isomer is oxidized at W while the unlike-isomer is oxidized at Ru, which is proven by IR, NIR and EPR-spectroscopy supported by spectro-electrochemistry and computational methods. The second oxidation of the complexes was shown to take place at the metal left unaffected in the first redox step. Finally, the tipping point could be realized in the unlike isomer of the electronically tuned thiophenolate congener [Tp'(CO)(PhS)W{?-?² -C,C'-?² -S,P-C₂ (PPh₂ )S}Ru(?⁵ -C₅ H₅ )-(PPh₃ )], in which valence trapped W^III /Ru^II and W^II /Ru^III cationic species are at equilibrium.

SUBMITTER: Ludwig S

PROVIDER: S-EPMC7756430 | biostudies-literature | 2020 Dec

REPOSITORIES: biostudies-literature

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Metal/Metal Redox Isomerism Governed by Configuration.

Ludwig Stephan S Helmdach Kai K Hüttenschmidt Mareike M Oberem Elisabeth E Rabeah Jabor J Villinger Alexander A Ludwig Ralf R Seidel Wolfram W WW

Chemistry (Weinheim an der Bergstrasse, Germany) 20201109 70

A pair of diastereomeric dinuclear complexes, [Tp'(CO)BrW{μ-η2 -C,C'-κ2 -S,P-C2 (PPh2 )S}Ru(η5 -C5 H5 )(PPh3 )], in which W and Ru are bridged by a phosphinyl(thiolato)alkyne in a side-on carbon P,S-chelate coordination mode, were synthesized, separated and fully characterized. Even though the isomers are similar in their spectroscopic properties and redox potentials, the like-isomer is oxidized at W while th ...[more]

PMID: 32648996

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Project description:Background: The high number of heavy metal resistance genes in the soil bacterium Cupriavidus metallidurans CH34 makes it an interesting model organism to study microbial responses to heavy metals. Results: In this study the transcriptional response of this bacterium was measured after challenging it to a wide range of sub-lethal concentrations of various essential or toxic metals. Considering the global transcriptional responses for each challenge as well as by identifying the overlap in upregulated genes between different metal responses, the sixteen metals could be clustered in three different groups. Additionally, next to the assessment of the transcriptional response of already known metal resistance genes, new metal response gene clusters were identified. The majority of the metal response loci showed similar expression profiles when cells were exposed to different metals, suggesting complex cross-talk at transcriptional level between the different metal responses. The highly redundant nature of these metal resistant regions – illustrated by the large number of paralogous genes – combined with the phylogenetic distribution of these metal response regions within evolutionary related and other metal resistant bacteria, provides important insights on the recent evolution of this naturally soil dwelling bacterium towards a highly metal-resistant strain found in harsh and anthropogenic environments. Conclusions: The metal-resistant soil bacterium Cupriavidus metallidurans CH34 displays myriads of gene expression patterns when exposed to a wide range of heavy metals at non-lethal concentrations. The interplay between the different gene expression clusters points towards a complex cross-regulated regulatory network governing heavy metal resistance in C. metallidurans CH34. Keywords: Cupriavidus metallidurans CH34, transcriptional regulation, heavy metal resistance Two-condition experiments. Comparing samples after induction with heavy metals versus non-induced samples. Biological duplicate or triplicate. Each array contains 3 or 4 technical replicates.

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Metal/Metal Redox Isomerism Governed by Configuration.

Publications

Metal/Metal Redox Isomerism Governed by Configuration.

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