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An unexpected rhenium(IV)-rhenium(VII) salt: [Co(NH₃)₆]₃[Re^VIIO₄][Re^IVF₆]₄·6H₂O.

ABSTRACT: The title hydrated salt, tris-[hexa-amminecobalt(III)] tetraoxidorhenate(VII) tetra-kis-[hexa-fluorido-rhenate(IV)] hexa-hydrate, arose unexpectedly due to possible contamination of the K₂ReF₆ starting material with KReO₄. It consists of octa-hedral [Co(NH₃)₆]³⁺ cation (Co1 site symmetry 1), tetra-hedral [Re^VIIO₄]^- anions (Re site symmetry 1) and octa-hedral [Re^IVF₆]^2- anions (Re site symmetries 1and ). The [ReF₆]^2- octa-hedral anions (mean Re-F = 1.834?Å), [Co(NH₃)₆]³⁺ octa-hedral cations (mean Co-N = 1.962?Å), and the [ReO₄]^- tetra-hedral anion (mean Re-O = 1.719?Å) are slightly distorted. A network of N-H?F hydrogen bonds consolidates the structure. The crystal studied was refined as a two-component twin.

SUBMITTER: Louis-Jean J

PROVIDER: S-EPMC6690467 | biostudies-literature | 2019 Aug

REPOSITORIES: biostudies-literature

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An unexpected rhenium(IV)-rhenium(VII) salt: [Co(NH3)6]3[ReVIIO4][ReIVF6]4·6H2O.

Louis-Jean James J Mariappan Balasekaran Samundeeswari S Hagenbach Adelheid A Poineau Frederic F

Acta crystallographica. Section E, Crystallographic communications 20190712 Pt 8

The title hydrated salt, tris-[hexa-amminecobalt(III)] tetraoxidorhenate(VII) tetra-kis-[hexa-fluorido-rhenate(IV)] hexa-hydrate, arose unexpectedly due to possible contamination of the K2ReF6 starting material with KReO4. It consists of octa-hedral [Co(NH3)6]3+ cation (Co1 site symmetry 1), tetra-hedral [ReVIIO4]- anions (Re site symmetry 1) and octa-hedral [ReIVF6]2-</s ...[more]

PMID: 31417784

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Project description:BackgroundIn northwest of China, mini Chinese cabbage (Brassica pekinensis) is highly valued by consumers, and is widely cultivated during winter in solar-greenhouses where low light (LL) fluence (between 85 and 150 μmol m-2 s-1 in day) is a major abiotic stress factor limiting plant growth and crop productivity. The mechanisms with which various NH4+: NO3- ratios affected growth and photosynthesis of mini Chinese cabbage under normal (200 μmol m-2 s-1) and low (100 μmol m-2 s-1) light conditions was investigated. The four solutions with different ratios of NH4+: NO3- applied were 0:100, 10:90, 15:85 and 25:75 with the set up in a glasshouse in hydroponic culture. The most appropriate NH4+: NO3- ratio that improved the tolerance of mini Chinese cabbage seedlings to LL was found in our current study.ResultsUnder low light, the application of NH4+: NO3- (10:90) significantly stimulated growth compared to only NO3- by increasing leaf area, canopy spread, biomass accumulation, and net photosynthetic rate. The increase in net photosynthetic rate was associated with an increase in: 1) maximum and effective quantum yield of PSII; 2) activities of Calvin cycle enzymes; and 3) levels of mRNA relative expression of several genes involved in Calvin cycle. In addition, glucose, fructose, sucrose, starch and total carbohydrate, which are the products of CO2 assimilation, accumulated most in the cabbage leaves that were supplied with NH4+: NO3- (10:90) under LL condition. Low light reduced the carbohydrate: nitrogen (C: N) ratio while the application of NH4+: NO3- (10:90) alleviated the negative effect of LL on C: N ratio mainly by increasing total carbohydrate contents.ConclusionsThe application of NH4+:NO3- (10:90) increased rbcL, rbcS, FBA, FBPase and TK expression and/or activities, enhanced photosynthesis, carbohydrate accumulation and improved the tolerance of mini Chinese cabbage seedlings to LL. The results of this study would provide theoretical basis and technical guidance for mini Chinese cabbage production. In practical production, the ratio of NH4+:NO3- should be adjusted with respect to light fluence for successful growing of mini Chinese cabbage.

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An unexpected rhenium(IV)-rhenium(VII) salt: [Co(NH₃)₆]₃[Re^VIIO₄][Re^IVF₆]₄·6H₂O.

Publications

An unexpected rhenium(IV)-rhenium(VII) salt: [Co(NH<sub>3</sub>)<sub>6</sub>]<sub>3</sub>[Re<sup>VII</sup>O<sub>4</sub>][Re<sup>IV</sup>F<sub>6</sub>]<sub>4</sub>·6H<sub>2</sub>O.

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