Bis(cyclooctatetraenyl)uranium (uranocene). A new class of sandwich complexes that utilize atomic f orbitals

1968 ◽  
Vol 90 (26) ◽  
pp. 7364-7364 ◽  
Author(s):  
Andrew. Streitwieser ◽  
Ulrich. Mueller-Westerhoff
Keyword(s):  
Sandwich Complexes ◽  
New Class

Using Zirconium Half-Sandwich Complexes as Building Blocks in a New Class of Zr-M Heterobimetallics Containing Unsupported Zr-M Bonds (M = Fe, Ru, Co)

1995 ◽  
Vol 14 (11) ◽  
pp. 5344-5349 ◽  
Author(s):  
Stefan Friedrich ◽  
Lutz H. Gade ◽  
Ian J. Scowen ◽  
Mary McPartlin
Keyword(s):  
Building Blocks ◽  
Sandwich Complexes ◽  
New Class ◽  
Half Sandwich

scholarly journals [La(ηx-Bx)La]− (x = 7–9): a new class of inverse sandwich complexes

2019 ◽  
Vol 10 (8) ◽  
pp. 2534-2542 ◽  
Author(s):  
Teng-Teng Chen ◽  
Wan-Lu Li ◽  
Jun Li ◽  
Lai-Sheng Wang
Keyword(s):  
Computational Chemistry ◽  
Photoelectron Spectroscopy ◽  
Sandwich Complexes ◽  
New Class ◽  
Lanthanide Elements

Photoelectron spectroscopy and computational chemistry reveal that lanthanide elements can form a class of novel inverse sandwich complexes consisting of aromatic B7, B8, and B9 monocyclic rings.

A new class of rare earth tetrapyrrole sandwich complexes containing corrole and phthalocyanine macrocycles: synthesis, physicochemical characterization and X-ray analysis

2015 ◽  
Vol 51 (12) ◽  
pp. 2411-2413 ◽  
Author(s):  
Guifen Lu ◽  
Sen Yan ◽  
Mengying Shi ◽  
Wenhan Yu ◽  
Jing Li ◽  
...  
Keyword(s):  
Rare Earth ◽  
Physicochemical Characterization ◽  
Sandwich Complexes ◽  
Sandwich Complex ◽  
X Ray ◽  
New Class

The first example of a tetrapyrrole sandwich complex containing corrole macrocycle is prepared and spectroscopically, electrochemically and structurally characterized.

In Situ microscopy of the anodic etching of silicon

1995 ◽  
Vol 53 ◽  
pp. 232-233
Author(s):  
Frances M. Ross ◽  
Peter C. Searson
Keyword(s):  
Composite Structures ◽  
High Surface ◽  
High Surface Area ◽  
Chemical Properties ◽  
Selective Etching ◽  
Silicon On Insulator ◽  
Second Phase ◽  
Porous Layers ◽  
New Class ◽  
Porous Semiconductors

Porous semiconductors represent a relatively new class of materials formed by the selective etching of a single or polycrystalline substrate. Although porous silicon has received considerable attention due to its novel optical properties1, porous layers can be formed in other semiconductors such as GaAs and GaP. These materials are characterised by very high surface area and by electrical, optical and chemical properties that may differ considerably from bulk. The properties depend on the pore morphology, which can be controlled by adjusting the processing conditions and the dopant concentration. A number of novel structures can be fabricated using selective etching. For example, self-supporting membranes can be made by growing pores through a wafer, films with modulated pore structure can be fabricated by varying the applied potential during growth, composite structures can be prepared by depositing a second phase into the pores and silicon-on-insulator structures can be formed by oxidising a buried porous layer. In all these applications the ability to grow nanostructures controllably is critical.

The microtubule associated protein (MAP) tau forms a new class of triple-stranded left-hand helical fibrous protein polymer

1992 ◽  
Vol 50 (1) ◽  
pp. 540-541
Author(s):  
G. C. Ruben ◽  
K. Iqbal ◽  
I. Grundke-Iqbal ◽  
H. Wisniewski ◽  
T. L. Ciardelli ◽  
...  
Keyword(s):  
Axial Ratio ◽  
Normal Structure ◽  
Paired Helical Filaments ◽  
Left Hand ◽  
New Class ◽  
Protein Polymer ◽  
Fibrous Protein ◽  
Protein Map ◽  
Neurotransmitter Transport ◽  
Alzheimer Neurofibrillary Tangles

In neurons, the microtubule associated protein, tau, is found in the axons. Tau stabilizes the microtubules required for neurotransmitter transport to the axonal terminal. Since tau has been found in both Alzheimer neurofibrillary tangles (NFT) and in paired helical filaments (PHF), the study of tau's normal structure had to preceed TEM studies of NFT and PHF. The structure of tau was first studied by ultracentrifugation. This work suggested that it was a rod shaped molecule with an axial ratio of 20:1. More recently, paraciystals of phosphorylated and nonphosphoiylated tau have been reported. Phosphorylated tau was 90-95 nm in length and 3-6 nm in diameter where as nonphosphorylated tau was 69-75 nm in length. A shorter length of 30 nm was reported for undamaged tau indicating that it is an extremely flexible molecule. Tau was also studied in relation to microtubules, and its length was found to be 56.1±14.1 nm.

Study of segregation in La1.8Sr0.2CuO4 superconductor by STEM-EDS microanalysis

1987 ◽  
Vol 45 ◽  
pp. 54-55
Author(s):  
T. F. Kelly ◽  
P. J. Lee ◽  
E. E. Hellstrom ◽  
D. C. Larbalestier
Keyword(s):  
Rare Earth ◽  
High Field ◽  
Transport Current ◽  
Total Thickness ◽  
New Class ◽  
Ceramic Superconductors ◽  
Current Densities ◽  
Group Ii ◽  
Eds Microanalysis

Recently there has been much excitement over a new class of high Tc (>30 K) ceramic superconductors of the form A1-xBxCuO4-x, where A is a rare earth and B is from Group II. Unfortunately these materials have only been able to support small transport current densities 1-10 A/cm2. It is very desirable to increase these values by 2 to 3 orders of magnitude for useful high field applications. The reason for these small transport currents is as yet unknown. Evidence has, however, been presented for superconducting clusters on a 50-100 nm scale and on a 1-3 μm scale. We therefore planned a detailed TEM and STEM microanalysis study in order to see whether any evidence for the clusters could be seen.A La1.8Sr0.2Cu04 pellet was cut into 1 mm thick slices from which 3 mm discs were cut. The discs were subsequently mechanically ground to 100 μm total thickness and dimpled to 20 μm thickness at the center.

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