Atomically precise and monolayer protected iridium clusters in solution

Bhat, Shridevi; Chakraborty, Indranath; Maark, Tuhina Adit; Mitra, Anuradha; De, Goutam; Pradeep, Thalappil

doi:10.1039/c5ra27972k

Cited by 13 publications

(12 citation statements)

References 63 publications

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“…In the case of Au clusters, trans -2-[3-(4- tert -butylphenyl)-2-methyl-2-propenylicene] malanonitrile (DCTB) was found as an optimal matrix, with a low degree of metal cluster fragmentation. For cobalt clusters, using a DCTB matrix led to a higher degree of fragmentation in the low m / z range, even under lower laser irradiance, similar to that observed previously for thiolated iridium clusters . After screening of different matrices, 2,4,6-trihydroxyacetophenone (THAP) led to a lower degree of fragmentation and reproducible results for the synthesized thiolated cobalt clusters.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Properties of Monolayer-Protected Co_x(SC₂H₄Ph)_m Nanoclusters

et al. 2017

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Nanometer-sized and stable thiolate-protected cobalt clusters were synthesized by a wet chemical method, leading to a pink solution with well-defined optical activity (UV-Vis) and photoluminescence (PL). The cobalt cluster core of ~1.3 nm size was metallic (as indicated by STEM, STM, XPS, HAADF-EELS) and was surrounded by a specific configuration of thiolate 2 staples (according to Raman, FTIR, XAFS, MALDI) that is similar to that of corresponding gold clusters.

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Section: Resultsmentioning

confidence: 99%

Synthesis and Properties of Monolayer-Protected Co_x(SC₂H₄Ph)_m Nanoclusters

et al. 2017

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“…Later,A gN Cs of different size and number of core atoms protected with 2-phenylethanthiol (PET) were synthesized,f or example, Ag 55 (PET) 31 , Ag 75 (PET) 40 ,A g 114 (PET) 46 ,A g 152 (PET) 60 ,A g 423 (PET) 105 ,A g 530 (PET) 100 ,A g 561 (PET) 150 ,a nd Ag 923 (PET) 151 comprehensively summarized in the review. [136] The synthesis of monolayer-protected Ir 9 (PET) 6 NCs was reported by Bhat et al [137] To achieve this, IrCl 3 ·x H 2 Oa nd PET were ground together until the formation of ay ellow Ir-PET complex. After that, solid NaBH 4 was added under ambientatmosphere whilegrinding to yield ablack mixture.…”

Section: Solid-state Synthesis Of Mncsmentioning

confidence: 99%

Metal Nanoclusters: New Paradigm in Catalysis for Water Splitting, Solar and Chemical Energy Conversion

et al. 2019

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A sustainable future demands innovative breakthroughs in science and technology today, especially in the energy sector. Earth‐abundant resources can be explored and used to develop renewable and sustainable resources of energy to meet the ever‐increasing global energy demand. Efficient solar‐powered conversion systems exploiting inexpensive and robust catalytic materials for the photo‐ and photo‐electro‐catalytic water splitting, photovoltaic cells, fuel cells, and usage of waste products (such as CO2) as chemical fuels are appealing solutions. Many electrocatalysts and nanomaterials have been extensively studied in this regard. Low overpotentials, catalytic stability, and accessibility remain major challenges. Metal nanoclusters (NCs, ≤3 nm) with dimensions between molecule and nanoparticles (NPs) are innovative materials in catalysis. They behave like a “superatom” with exciting size‐ and facet‐dependent properties and dynamic intrinsic characteristics. Being an emerging field in recent scientific endeavors, metal NCs are believed to replace the natural photosystem II for the generation of green electrons in a viable way to facilitate the challenging catalytic processes in energy‐conversion schemes. This Review aims to discuss metal NCs in terms of their unique physicochemical properties, possible synthetic approaches by wet chemistry, and various applications (mostly recent advances in the electrochemical and photo‐electrochemical water splitting cycle and the oxygen reduction reaction in fuel cells). Moreover, the significant role that MNCs play in dye‐sensitized solar cells and nanoarrays as a light‐harvesting antenna, the electrochemical reduction of CO2 into fuels, and concluding remarks about the present and future perspectives of MNCs in the frontiers of surface science are also critically reviewed.

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“…4). The relative high abundance of metallic phase was reported in the literature for 2 nm sized Ir NPs on graphite nano-fibers [53] or for an Ir monolayer protected cluster [54]. The metallic state is dominant also in Pd and Pd-Ir nanoparticles [55].…”

Section: Catalysts' Characterizationmentioning

confidence: 73%

Glycerol to lactic acid conversion by NHC-stabilized iridium nanoparticles

Oberhauser

Evangelisti

Liscio

et al. 2018

Journal of Catalysis

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Hydrogen reduction of an Ir(I) complex featured by a bulky N-heterocyclic carbene (NHC) ligand in dichloromethane gave small-sized (1.8 nm) Ir nanoparticles (NPs) decorated with NHC ligands (Ir NHC). 1,4-Dioxane solutions of the latter particles were successfully applied to convert glycerol into lactic acid in the presence of NaOH (i.e. 1 mol equivalent with respect to glycerol). Ir NHC showed an atom-related TOF value of almost 10 4 h À1 , an almost exclusive formation of liquid reaction products, a high selectivity for lactic acid (93.0%) and a complete recyclability in air atmosphere. Attempts to synthesize analogous NHC-stabilized Ir NPs on a high surface area carbon support (C K) by reducing the same Ir(I) precursor, supported onto C K , prior to the hydrogen reduction in water, gave almost naked C K-supported Ir NPs (1.4 nm). Their catalytic activity tested for the same reaction in water as reaction medium, exhibited much lower catalytic activity (4 Â 10 3 h À1), a lower percentage of liquid reaction products (i.e. 27.0% of the converted glycerol) and a lower selectivity for lactic acid compared to Ir NHC .

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Atomically precise and monolayer protected iridium clusters in solution

Abstract: The first atomically precise and monolayer protected iridium cluster in solution, Ir9(PET)6 (PET – 2-phenyethanethiol) was synthesized via a solid state method.

Cited by 13 publications

References 63 publications

Synthesis and Properties of Monolayer-Protected Co_x(SC₂H₄Ph)_m Nanoclusters

Synthesis and Properties of Monolayer-Protected Co_x(SC₂H₄Ph)_m Nanoclusters

Metal Nanoclusters: New Paradigm in Catalysis for Water Splitting, Solar and Chemical Energy Conversion

Glycerol to lactic acid conversion by NHC-stabilized iridium nanoparticles

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Atomically precise and monolayer protected iridium clusters in solution

Abstract: The first atomically precise and monolayer protected iridium cluster in solution, Ir9(PET)6 (PET – 2-phenyethanethiol) was synthesized via a solid state method.

Cited by 13 publications

References 63 publications

Synthesis and Properties of Monolayer-Protected Cox(SC2H4Ph)m Nanoclusters

Synthesis and Properties of Monolayer-Protected Cox(SC2H4Ph)m Nanoclusters

Metal Nanoclusters: New Paradigm in Catalysis for Water Splitting, Solar and Chemical Energy Conversion

Glycerol to lactic acid conversion by NHC-stabilized iridium nanoparticles

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Synthesis and Properties of Monolayer-Protected Co_x(SC₂H₄Ph)_m Nanoclusters

Synthesis and Properties of Monolayer-Protected Co_x(SC₂H₄Ph)_m Nanoclusters