N-Heterocyclic carbene-based gold etchants

• Robert B. Chevalier,
• Justin Pantano,
• Matthew K. Kiesewetter and
• Jason R. Dwyer

Beilstein J. Nanotechnol. 2023, 14, 865–871, doi:10.3762/bjnano.14.71

• conditions that the thiol-linked monolayer can be exposed to, prompting the development of alternative surface linking chemistry [12]. N-Heterocyclic carbene (NHC)-based monolayers have received increasing attention for their reported stability under a variety of harsh conditions [11][13][14][15][16]. Indeed

• two different solution-based surface functionalization routes. One involved the deprotonation of a benzimidazolium precursor in toluene under air-free conditions. The other was in methanol and took advantage of the equilibrium between a benzimidazolium hydrogen carbonate salt and free carbene with

Molecular nanoarchitectonics: unification of nanotechnology and molecular/materials science

• Katsuhiko Ariga

Beilstein J. Nanotechnol. 2023, 14, 434–453, doi:10.3762/bjnano.14.35

• molecule was covalently bonded to each end of the π-conjugated polydiacetylene backbone. The carbene at the front end of the polydiacetylene chain reacted with the 6-6 moiety of the C60 molecule, cleaving a double bond of the C60 molecule and forming a three-membered ring via cycloaddition as an

Gold(I) N-heterocyclic carbene precursors for focused electron beam-induced deposition

• Cristiano Glessi,
• Aya Mahgoub,
• Cornelis W. Hagen and
• Mats Tilset

Beilstein J. Nanotechnol. 2021, 12, 257–269, doi:10.3762/bjnano.12.21

• Sciences, Dept. Imaging Physics, Lorentzweg 1, 2628CJ Delft, Netherlands 10.3762/bjnano.12.21 Abstract Seven gold(I) N-heterocyclic carbene (NHC) complexes were synthesized, characterized, and identified as suitable precursors for focused electron beam-induced deposition (FEBID). Several variations on the

• −. Keywords: Au(I) precursors; focused electron beam-induced deposition (FEBID); gold-NHC; gold precursors; nanofabrication; N-heterocyclic carbene; Introduction Focused electron beam-induced deposition (FEBID) is a nanofabrication technique that allows for the growth of three-dimensional free-standing

• -heterocyclic carbene (NHC) complexes on the growth rate and composition of deposits. The precursors that were synthesized had the general formula Au(NHC)X, and the effect of the variation of both the NHC ligand and the ancillary ligand X (X = Cl, Br, I, CF3) (Figure 1) was studied. Because the sublimation

Synthesis of nickel/gallium nanoalloys using a dual-source approach in 1-alkyl-3-methylimidazole ionic liquids

• Ilka Simon,
• Julius Hornung,
• Juri Barthel,
• Jörg Thomas,
• Maik Finze,
• Roland A. Fischer and
• Christoph Janiak

Beilstein J. Nanotechnol. 2019, 10, 1754–1767, doi:10.3762/bjnano.10.171

• carbene ligands (NHC) stabilize metal clusters and nanoparticles [44]. By insertion of the transition-metal center into the C2–H bond of imidazolium salts, transition-metal hydride complexes are formed [45]. Finally, H transfer reactions from the transition metal to GaCp* lead to the release of Cp*H

Deposition of metal particles onto semiconductor nanorods using an ionic liquid

• Michael D. Ballentine,
• Elizabeth G. Embry,
• Marco A. Garcia and
• Lawrence J. Hill

Beilstein J. Nanotechnol. 2019, 10, 718–724, doi:10.3762/bjnano.10.71

• ] using Pt(acac)2 and an ammonium bromide [31], and a mechanism involving the acetylacetonate ligands was suggested in a subsequent review article [15]. Additionally, a carbene mechanism involving the imidazolium cation could also contribute to the reduction mechanism [32], as proposed for Pd

Electrolyte tuning in dye-sensitized solar cells with N-heterocyclic carbene (NHC) iron(II) sensitizers

• Mariia Karpacheva,
• Catherine E. Housecroft and
• Edwin C. Constable

Beilstein J. Nanotechnol. 2018, 9, 3069–3078, doi:10.3762/bjnano.9.285

• reported N-heterocyclic carbene iron(II) dye in the presence of chenodeoxycholic acid co-adsorbant, can be considerably improved by altering the composition of the electrolyte while retaining an I−/I3− redox shuttle. Critical factors are the solvent, presence of ionic liquid, and the use of the additives 1

• ; N-heterocyclic carbene iron(II) complex; solar energy conversion; sustainable energy; Introduction The field of dye sensitized solar cells (DSCs) has developed significantly [1][2][3] since the pioneering publication of O’Regan and Grätzel [4]. Photoconversion efficiencies (η) of ≈11–14% have been

• -[Fe{bpy-4,4'-(CO2H)2}2(CN)2] (Scheme 2) achieved a short-circuit current density (JSC) of 0.29 mA cm−2 and an open-circuit voltage (VOC) of 360 mV. However, little progress was made in this area [26] until the interest shifted to the use of iron(II) complexes incorporating N-heterocyclic carbene (NHC

Electron-driven and thermal chemistry during water-assisted purification of platinum nanomaterials generated by electron beam induced deposition

• Ziyan Warneke,
• Markus Rohdenburg,
• Jonas Warneke,
• Janina Kopyra and
• Petra Swiderek

Beilstein J. Nanotechnol. 2018, 9, 77–90, doi:10.3762/bjnano.9.10

• intermediate with Pt=CH2 unit, i.e., a carbene ligand. Such intermediates are akin to species occurring in dehydrogenation reactions of CH3 groups on Pt surfaces [22] and have also been observed in the gas phase following reactive interaction between Pt+ ions and CH4 [23]. Unfortunately, absolute cross section

Adsorbate-driven cooling of carbene-based molecular junctions

• Giuseppe Foti and
• Héctor Vázquez

Beilstein J. Nanotechnol. 2017, 8, 2060–2068, doi:10.3762/bjnano.8.206

• Giuseppe Foti Hector Vazquez Institute of Physics, Academy of Sciences of the Czech Republic, Cukrovarnicka 10, Prague, Czech Republic 10.3762/bjnano.8.206 Abstract We study the role of an NH2 adsorbate on the current-induced heating and cooling of a neighboring carbene-based molecular circuit

• that the charge rearrangement resulting from the adsorbate gates the carbene electronic structure and reduces the density of carbene states near the Fermi level as a function of bias. These effects result in the cooling of carbene modes at all voltages compared to the “clean” carbene-based junction. We

• stability under bias of single-molecule circuits. Keywords: adsorbate; carbene; current-induced heating and cooling; molecular junction; vibrations; Introduction Molecular electronics has experienced a remarkable progress since its first proposal [1]. Theoretical as well as experimental advances have made

Reasons and remedies for the agglomeration of multilayered graphene and carbon nanotubes in polymers

• Rasheed Atif and
• Fawad Inam

Beilstein J. Nanotechnol. 2016, 7, 1174–1196, doi:10.3762/bjnano.7.109

• ]. The different reactions for functionalization include cycloadditions such as the Diels–Alder reaction and the addition of azomethine ylides, carbene and nitrene addition, chlorination, bromination and hydrogenation [40]. Different chemically attached functional groups on the sidewalls of nanotubes are