Metal Nanoparticles Confronted with Foreign Ligands: Mere Ligand Exchange or Further Structural Transformation?

Small ◽  
2020 ◽  
pp. 2000609
Author(s):  
Nan Yan ◽  
Nan Xia ◽  
Zhikun Wu
Keyword(s):  
Metal Nanoparticles ◽  
Structural Transformation ◽  
Ligand Exchange

Synthesis of CuInS2 nanocrystals and their structural transformation triggered by ligand exchange

2009 ◽  
Vol 54 (21) ◽  
pp. 4005-4008 ◽  
Author(s):  
Nose Katsuhiro ◽  
Soma Yuki ◽  
Omata Takahisa ◽  
Otsuka-Yao-Matsuo Shinya
Keyword(s):  
Structural Transformation ◽  
Ligand Exchange ◽  
Cuins2 Nanocrystals

Chiral metal nanoparticles encapsulated by a chiral phosphine cavitand with the tetrakis-BINAP moiety: their remarkable stability toward ligand exchange and thermal racemization

2016 ◽  
Vol 45 (11) ◽  
pp. 4486-4490 ◽  
Author(s):  
Ryo Nishimura ◽  
Ryo Yasutake ◽  
Shota Yamada ◽  
Koji Sawai ◽  
Kazuki Noura ◽  
...  
Keyword(s):  
Metal Nanoparticles ◽  
Ligand Exchange ◽  
Au Nanoparticles

A chiral phosphine cavitand1induced the formation of chiral metal (Ru, Rh, Pd, Ag, Pt, and Au) nanoparticles (NPs). The ligand1of the chiral metal NPs prevents both thermal racemization and ligand exchange with a thiol.

Structural Transformation and Luminescence Response of Magic-Size Silver(I) Chalcogenide Clusters via Ligand-Exchange

2021 ◽  
Author(s):  
Wei-Hong Wu ◽  
Hui-Min Zeng ◽  
Ze-Nan Yu ◽  
Chao Wang ◽  
Zhan-Guo Jiang ◽  
...  
Keyword(s):  
Structural Transformation ◽  
Ligand Exchange ◽  
Structural Transformations ◽  
Structure Property ◽  
Chalcogenide Clusters ◽  
Property Correlation ◽  
Fundamental Science

Structural transformations of nanoclusters provide a platform to tune their properties and understand the fundamental science due to their intimate structure–property correlation. Here, we present a ligand-exchange induced growth of...

The structure of pre-mRNA and mRNA from erythroid cells

1978 ◽  
Vol 36 (2) ◽  
pp. 234-235
Author(s):  
A.-M. Ladhoff ◽  
B.J. Thiele ◽  
Ch. Coutelle ◽  
S. Rosenthal
Keyword(s):  
Bone Marrow ◽  
Structural Transformation ◽  
Electron Micrographs ◽  
Ammonium Acetate ◽  
Bone Marrow Cells ◽  
Erythroid Cells ◽  
Globin Mrna ◽  
Ordered Structures ◽  
Rabbit Bone ◽  
Rabbit Reticulocytes

The suggested precursor-product relationship between the nuclear pre-mRNA and the cytoplasmic mRNA has created increased interest also in the structure of these RNA species. Previously we have been published electron micrographs of individual pre-mRNA molecules from erythroid cells. An intersting observation was the appearance of a contour, probably corresponding to higher ordered structures, on one end of 10 % of the pre-mRNA molecules from erythroid rabbit bone marrow cells (Fig. 1A). A virtual similar contour was observed in molecules of 9S globin mRNA from rabbit reticulocytes (Fig. 1B). A structural transformation in a linear contour occurs if the RNA is heated for 10 min to 90°C in the presence of 80 % formamide. This structural transformation is reversible when the denatured RNA is precipitated and redissolved in 0.2 M ammonium acetate.

Structural Transformation of a Germanium Σ=13 (510) [001] Tilt Grain Boundary under the Electron Beam

1990 ◽  
Vol 48 (1) ◽  
pp. 52-53 ◽  
Author(s):  
Jean-Luc Rouvière ◽  
Alain Bourret
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
Grain Boundary ◽  
Structural Transformation ◽  
Mirror Symmetry ◽  
High Resolution Electron Microscopy ◽  
Structural Transformations ◽  
Covalent Bonds ◽  
Resolution Electron ◽  
Tilt Grain Boundary

The possible structural transformations during the sample preparations and the sample observations are important issues in electron microscopy. Several publications of High Resolution Electron Microscopy (HREM) have reported that structural transformations and evaporation of the thin parts of a specimen could happen in the microscope. Diffusion and preferential etchings could also occur during the sample preparation.Here we report a structural transformation of a germanium Σ=13 (510) [001] tilt grain boundary that occurred in a medium-voltage electron microscopy (JEOL 400KV).Among the different (001) tilt grain boundaries whose atomic structures were entirely determined by High Resolution Electron Microscopy (Σ = 5(310), Σ = 13 (320), Σ = 13 (510), Σ = 65 (1130), Σ = 25 (710) and Σ = 41 (910), the Σ = 13 (510) interface is the most interesting. It exhibits two kinds of structures. One of them, the M-structure, has tetracoordinated covalent bonds and is periodic (fig. 1). The other, the U-structure, is also tetracoordinated but is not strictly periodic (fig. 2). It is composed of a periodically repeated constant part that separates variable cores where some atoms can have several stable positions. The M-structure has a mirror glide symmetry. At Scherzer defocus, its HREM images have characteristic groups of three big white dots that are distributed on alternatively facing right and left arcs (fig. 1). The (001) projection of the U-structure has an apparent mirror symmetry, the portions of good coincidence zones (“perfect crystal structure”) regularly separate the variable cores regions (fig. 2).

STRUCTURAL TRANSFORMATION STUDIED BY THERMAL EXPANSION ON SINGLE CRYSTALS V3Si IN NORMAL AND SUPERCONDUCTING STATES

1978 ◽  
Vol 39 (C6) ◽  
pp. C6-406-C6-407 ◽  
Author(s):  
T. Fukase ◽  
T. Kobayashi ◽  
M. Isino ◽  
N. Toyota ◽  
Y. Muto
Keyword(s):  
Thermal Expansion ◽  
Single Crystals ◽  
Structural Transformation
Sign in / Sign up

Export Citation Format

Share Document