Root uptake and phytotoxicity of nanosized molybdenum octahedral clusters

Aubert, Tangi; Burel, Agnès; Esnault, Marie-Andrée; Cordier, Stéphane; Grasset, Fabien; Cabello‐Hurtado, Francisco

doi:10.1016/j.jhazmat.2012.03.058

Cited by 80 publications

(62 citation statements)

References 29 publications

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“…The formation of aggregates of molybdenum cluster complexes in water has been already reported; however, in that case, aggregates were formed via the hydrolysis of Cs 2 [Mo 6 Br 14 ] and particles were of a significantly larger diameter (in the micrometer range). 11 The 2@poly-β-CD particles displayed an initial diameter of 242 nm with a narrow size distribution (PDI = 0.087). The size reached 165 nm (PDI = 0.088) after 14 days and did not show any subsequent variations.…”

Section: Inorganic Chemistrymentioning

confidence: 99%

“…Indeed, the archetypal molybdenum halides [Mo 6 X 14 ] 2− (X = Cl, Br, and I) are known to be stable only in concentrated aqueous solutions of their related acid HX and an increase of the pH causes the formation of aqua-hydroxo complexes [Mo 6 X x (OH) y (H 2 O) z ] n . 11 From a practical point of view, this hydrolysis is detrimental as it leads to microsized aggregates with poorly defined photophysical properties. In addition, such aggregates have shown an acute toxicity for living organisms, which restricts the use of cluster complexes in biological applications.…”

Section: ■ Introductionmentioning

confidence: 99%

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Luminescent Hydrogel Particles Prepared by Self-Assembly of β-Cyclodextrin Polymer and Octahedral Molybdenum Cluster Complexes

et al. 2014

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A series of luminescent octahedral molybdenum cluster complexes were obtained by treating Na2[Mo6I8(OMe)6] with icosahedral closo-dicarbaborane C-carboxylic acids in refluxing tetrahydrofuran. The study of the photophysical properties of Na2[Mo6I8(1-OOC-1,2-closo-C2B10H11)6] (1), Na2[Mo6I8(1-OOC-1,7-closo-C2B10H11)6] (2), and Na2[Mo6I8(1-OOC-1,12-closo-C2B10H11)6] (3) in acetonitrile revealed a red luminescence with high quantum yields up to 0.93 for 2, an efficient quenching of the luminescence by oxygen, and high quantum yields of singlet oxygen formation of approximately 0.7. Self-assembly between compound 2 and β-cyclodextrin polymer led to monodisperse hydrogel particles with a diameter of approximately 200 nm and unchanged luminescence spectra and kinetics features over 14 days. In contrast, bare cluster complex 2 in water formed aggregates and hydrolyzed over the time as indicated by a progressive red shift of the luminescence maxima. The invariance of key photophysical parameters of the hydrogel particles coupled with a high oxygen sensitivity of the luminescence are attractive features for long-term biological experiments involving optical oxygen probing. In addition, this hydrogel is a singlet oxygen sensitizer in water with promising properties for photodynamic therapy.

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Section: Inorganic Chemistrymentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Luminescent Hydrogel Particles Prepared by Self-Assembly of β-Cyclodextrin Polymer and Octahedral Molybdenum Cluster Complexes

et al. 2014

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“…Leveraging advanced spectroscopic and microscopic capabilities such as X-ray absorption spectroscopy (XAS), scanning/ transmission electron microscopy-energy dispersive spectroscopy (S/TEM-EDS), confocal laser scanning microscopy (CLSM), and other similar instrumentations, novel evidences are increasingly being presented of alternative uptake into plant tissues of Fe, Cu, Mn, Ni, Mo, and Zn in the form of oxides or composite particles (Aubert et al 2012;Dimkpa et al 2012bDimkpa et al , 2013aWang et al 2012a, b;Faisal et al 2013;Ghafariyan et al 2013;Pradhan et al 2013;Bandyopadhyay et al 2015). This is in contrast to the conventional uptake of micronutrients as ions, hitherto the consensus knowledge.…”

Section: Uptake Of Nanoparticulate Nutrientsmentioning

confidence: 99%

Fortification of micronutrients for efficient agronomic production: a review

Dimkpa

Bindraban

2016

Agron. Sustain. Dev.

280

163

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Micronutrients are essential mineral elements required for both plant and human development. However, micronutrients are often lacking in soils, crop, and food. Micronutrients are therefore used as fertilizer to increase crop productivity, especially when the application of conventional NPK fertilizers is not efficient. Here, we review the application of micronutrients in crop production. Reports show that micronutrients enhance crop nutritional quality, crop yield, biomass production, and resiliency to drought, pest, and diseases. These positive effects range from 10 to 70 %, dependent on the micronutrient, and occur with or without NPK fertilization. We discuss the uptake by plants of micronutrients as nanosize particulate materials, relative to conventional uptake of ionic nutrients. We also show that packaging of micronutrients as nanoparticles could have more profound effects on crop responses and fertilizer use efficiency, compared to conventional salts or bulk oxides.

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“…The chemical shifts were calibrated using a reference of tetramethylsilane (TMS) for 29 procedures were similar to those previously described for the evaluation of the toxicity of the Cs 2 [Mo 6 Br 14 ] cluster compound before its encapsulation in silica nanoparticles. 44 Briefly, eight rapeseed seeds were transferred onto sterilized filter papers (Whatman n°3) disposed in 90 mm × 15 mm Petri dishes containing 4 mL of an aqueous solution of Cs 2 [Mo 6 Br 14 ] @SiO 2 or SiO 2 nanoparticles at 1000 μg/mL. Controls have been prepared by dispersing pure Milli-Q water.…”

Section: Characterization Techniquesmentioning

confidence: 99%

“…The results and discussion constitute therefore an important step toward a better control of their optical properties. Finally, the toxicity of Cs 2 [Mo 6 Br 14 ] @SiO 2 nanoparticles was evaluated by using recently developed nanotoxicity tests on plants 44 and by human cell proliferation assays.…”

Section: Introductionmentioning

confidence: 99%

Extended Investigations on Luminescent Cs₂[Mo₆Br₁₄]@SiO₂ Nanoparticles: Physico-Structural Characterizations and Toxicity Studies

et al. 2013

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Functional silica nanoparticles and in particular luminescent silica nanoparticles constitute very promising candidates for many applications in the field of biotechnology, theranostics, and photonics. However, optimizing the design of such materials requires a deep understanding of their physicochemical properties. In this article are reported extended investigations on luminescent Cs 2 [Mo 6 Br 14 ]@SiO 2 nanoparticles prepared by a water-in-oil microemulsion technique. We bring here new insights into the structure of such nanoparticles and its interplay with their optical properties. The structural interactions between the cluster units and the silica matrix were investigated and are discussed in details on the basis of FE-SEM, HAADF-STEM, ICP-OES, BET, 29 Si MAS NMR, and photoluminescence studies. As part of the risk evaluation before potential applications, the toxicity of the nanoparticles both on plants and on human cells was evaluated.

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Root uptake and phytotoxicity of nanosized molybdenum octahedral clusters

Cited by 80 publications

References 29 publications

Luminescent Hydrogel Particles Prepared by Self-Assembly of β-Cyclodextrin Polymer and Octahedral Molybdenum Cluster Complexes

Luminescent Hydrogel Particles Prepared by Self-Assembly of β-Cyclodextrin Polymer and Octahedral Molybdenum Cluster Complexes

Fortification of micronutrients for efficient agronomic production: a review

Extended Investigations on Luminescent Cs₂[Mo₆Br₁₄]@SiO₂ Nanoparticles: Physico-Structural Characterizations and Toxicity Studies

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Root uptake and phytotoxicity of nanosized molybdenum octahedral clusters

Cited by 80 publications

References 29 publications

Luminescent Hydrogel Particles Prepared by Self-Assembly of β-Cyclodextrin Polymer and Octahedral Molybdenum Cluster Complexes

Luminescent Hydrogel Particles Prepared by Self-Assembly of β-Cyclodextrin Polymer and Octahedral Molybdenum Cluster Complexes

Fortification of micronutrients for efficient agronomic production: a review

Extended Investigations on Luminescent Cs2[Mo6Br14]@SiO2 Nanoparticles: Physico-Structural Characterizations and Toxicity Studies

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Extended Investigations on Luminescent Cs₂[Mo₆Br₁₄]@SiO₂ Nanoparticles: Physico-Structural Characterizations and Toxicity Studies