A highly stable rhenium organosol on a DNA scaffold for catalytic and SERS applications

Sakthikumar, K.; Anantharaj, Sengeni; Ede, Sivasankara Rao; Karthick, K.; Kundu, Subrata

doi:10.1039/c6tc01250g

Cited by 39 publications

(43 citation statements)

References 62 publications

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“…The UV‐visible absorption spectrum of an aqueous solution of pure DNA exhibited a predominant peak at λ max =260 nm resulting from the absorption of the aromatic bases present in the backbone of the DNA (Figure ) ,,. The absorption spectrum of the aqueous solution of the Rh/DNA was very similar to that of pure DNA with the absorption band only slightly shifted.…”

Section: Resultsmentioning

confidence: 93%

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Rh/DNA Nanoparticles, Synthesis, Characterization and Catalytic Activity in “On Water” Asymmetric Hydroformylation Reaction

Alsalahi

Trzeciak

2018

ChemistrySelect

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DNA-stabilized Rh NPs were synthesized by the chemical reduction of Rh(acac)(CO) 2 (acac = acetylacetonate) in water at 80 8C. The obtained nanoparticles, Rh/DNA, were characterized by various spectroscopic and microscopic methods, such as IR, UV-Vis, XRD (X-ray diffraction), ICP-AES (Inductively coupled plasma atomic emission spectroscopy), EDX (Energy-dispersive X-ray spectroscopy analysis), TEM (Transmission electron microscopy), and SEM (Scanning electron microscopy) analyses. Their catalytic activity was successfully investigated in the "on water" hydroformylation of styrene. The conversion of styrene and chemoselectivity towards aldehydes were 100%. A high iso/n ratio was also obtained, up to 6.1 and 16.7 with PPh 3 (triphenylphosphine) and (R)-BINAP (2,2'-bis(diphenylphosphino)-1,1'-binaphthyl) ligands respectively. In the hydroformylation of vinyl acetate with Rh/DNA, performed in the presence of a chiral BINAP ligand "on water", high enantioselectivity was obtained, up to 49% ee. These results were significantly better than when utilizing Rh(acac)(CO) 2 as a catalyst under the same conditions. dd, 24.5 ppm, J Rh-P 129.6 Hz, J P-P 44.2 Hz; dd, 45.4 ppm, J Rh-P 161.1 Hz d, 36.3 ppm, J Rh-P 176.7 Hz d, 49 ppm, J Rh-P 176.7 Hz Rh(acac)(CO) 2 + BINAP + H 2 /CO + vinyl acetate (on water, Figure S10) d, 46.6 ppm, J Rh-P 172.6 Hz d, 53.1 ppm, J Rh-P 168.4 Hz Rh(acac)(CO) 2 + BINAP + H 2 /CO + vinyl acetate (in C 6 D 6 , Figure S27) 1) dd, 24.5 ppm, J Rh-P 141.2 Hz, J P-P 42 Hz; dd, 48.4 ppm, J Rh-P 152.2 Hz; 2) dd, 37.5 ppm, J P-P 32.3, J Rh-P 75.3 Hz m, 33.7 ppm, J Rh-P 68.7 Hz d, 36.6 ppm, J Rh-P 137.6 Rh/DNA + BINAP + H 2 /CO + vinyl acetate (Figure S8) 1) dd, 23.3 ppm, J Rh-P 134.5 Hz, J P-P 44.9 Hz; dd, 43.9 ppm, J Rh-P 155.6 Hz; 2) dd, 39.7 ppm, J P-P 44.9, J Rh-P 144.8 Hz m, 35.3 ppm, J Rh-P 75.3 Hz m, 12.2 ppm, J Rh-P 215.8 Hz d, 25.1 ppm, J Rh-P 139.2 Hz d, 28.9 ppm, J Rh-P 85 Hz m, 35.3 ppm, J Rh-P 75 Hz a experimental details are presented in supplementary material. Signals originated from BINAPO and BINAPO 2 were observed ca. 30 ppm and ca. À15 ppm. [77]

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Section: Resultsmentioning

confidence: 93%

“…A new DNA‐based asymmetric Diels‐Alder,,, Friedel‐Crafts, or other C–C bond forming reactions, yielding desired products with 99% or 93% ee, have been performed by utilizing a DNA‐copper catalyst. DNA was also used to stabilize metal nanoparticles such as Rh,, Pt,, Fe, Au,,, Ag,, Pd,, or Re ,…”

Section: Introductionmentioning

confidence: 99%

Rh/DNA Nanoparticles, Synthesis, Characterization and Catalytic Activity in “On Water” Asymmetric Hydroformylation Reaction

Alsalahi

Trzeciak

2018

ChemistrySelect

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“…The SERS study on detecting MB using such hybrids also demonstrated a high enhancement factor of 2.07 × 10 7 . The same research group later synthesized ultra-small ReNPs in an organosol, where the mixture of NH 4 ReO 4 and DNA was first transferred from the aqueous phase to the organic phase using tetraoctylammonium bromide (TOAB) as a phase transfer catalyst under freezing conditions and then reduced by NaBH 4 [175]. Yurkov et al [41] employed a thermal decomposition approach to synthesize Re-polyethylene (Re@PE) nanocomposites.…”

Section: Rhenium-based Nanocompositesmentioning

confidence: 99%

Synthesis of cobalt, palladium, and rhenium nanoparticles

2020

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Over the past decade, metal nanoparticles (MNPs) have attracted extensive attention due to their unique physiochemical properties that make them highly applicable in various fields such as chemical sensing, energy storage, catalysis, medicine, and environmental engineering. Their physiochemical properties depend drastically on the MNP size and morphology, which are largely determined by their synthesis methods. Research on MNPs predominantly focused on coinage metals (Au, Ag and Cu), but in the last decade research on metals with a relatively high melting temperature such as Pd, Co, and Re has seen rapid increases, mainly driven by their potential applications as catalysts. This paper presents the recent advances on different synthesis techniques of Co, Pd, and Re nanoparticles, their resulting nanostructures, as well as existing and potential applications.

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“…It works, when the incident light hits on rough metal surface adsorbed on the probe molecule gets increased Raman signal in a few orders of magnitude [7,8]. The noble metal-based nanomaterials (NMs) such as Ag [9], Au [10], Pt [11], Pd [12], Re [13], Os [14], Ir [15], and RuO 2 [16] having the remarkable surface plasmon resonance (SPR) nature in the visible region. Many factors that are influencing the enhancement of such SERS signal mainly, wavelength, polarization, and incidence angle of the laser light [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Engineered Rh Nano-networks on DNA for SERS Applications

2020

J Nanotechnol Nanomaterials

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Preparation of nanomaterials (NMs) using bio-molecules such as DNA as scaffolds is a simple, greener, and reliable way of designing the size and shape selective NMs. The Rh nanoparticles prepared on DNA scaffolds generate perfect nano-networks structure by utilizing a simple wet-chemical method in presence of NaBH 4 as reducing agent. The prepared Rh nanoparticles on DNA scaffolds were effectively utilized for Surface-Enhanced Raman Scattering (SERS) studies using methylene blue (MB) as a SERS probe molecule. The DNA facilities to control the Rh NPs to grow below 5 nm in diameter and effectively utilized to increase the Raman signal. The highest SERS enhancement factor (EF) calculated was 1.19×10 5 for the lowest probe detection limit of 10 -6 M. The stability of these Rh nano-networks were verified by aging the sample for more than six months which shows the same SERS efficiency.

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A highly stable rhenium organosol on a DNA scaffold for catalytic and SERS applications

Abstract: A highly stable Re0 organosol on a DNA scaffold has been synthesized for the first time and tested for two different potential applications such as in the catalytic reduction of hexavalent chromium ions and in SERS studies.

Cited by 39 publications

References 62 publications

Rh/DNA Nanoparticles, Synthesis, Characterization and Catalytic Activity in “On Water” Asymmetric Hydroformylation Reaction

Rh/DNA Nanoparticles, Synthesis, Characterization and Catalytic Activity in “On Water” Asymmetric Hydroformylation Reaction

Synthesis of cobalt, palladium, and rhenium nanoparticles

Engineered Rh Nano-networks on DNA for SERS Applications

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