Steric Effects in the Self-Assembly of Palladium Complexes with Chelating Diamine Ligands

2008 ◽  
Vol 2008 (10) ◽  
pp. 1573-1583 ◽  
Author(s):  
Eszter Holló-Sitkei ◽  
Gábor Tárkányi ◽  
László Párkányi ◽  
Tünde Megyes ◽  
Gábor Besenyei
Keyword(s):  
Self Assembly ◽  
Palladium Complexes ◽  
The Self ◽  
Steric Effects ◽  
Diamine Ligands

A series of helical coordination polymers based on two racemic bis(pyridylmethylene) propane-1,2-diamine ligands: relationship of conformations, structures and properties

CrystEngComm ◽  
2019 ◽  
Vol 21 (47) ◽  
pp. 7249-7259 ◽  
Author(s):  
Li-Na Zhu ◽  
Zhao-Peng Deng ◽  
Li-Hua Huo ◽  
Shan Gao
Keyword(s):  
Coordination Polymers ◽  
Self Assembly ◽  
The Self ◽  
Metal Salts ◽  
Structures And Properties ◽  
Relationship Of ◽  
Diamine Ligands

The self-assembly of d10 metal salts and two racemic bis(pyridyl) diamine ligands generates ten complexes, showing diverse helical and wavelike chains, (4,4) layers, as well as 3D sqc and uog nets.

scholarly journals Self-assembly of an Organometallic Fe9O6 Cluster from Aerobic Oxidation of (tmeda)Fe(CH2tBu)2

2019 ◽  
Author(s):  
Jonathan Kephart ◽  
Zachary Hecht ◽  
Brooke N. Livesay ◽  
Matthew P. Shores ◽  
V. Codrina Popescu ◽  
...  
Keyword(s):  
Solid State ◽  
High Spin ◽  
Self Assembly ◽  
Organometallic Compound ◽  
Aerobic Oxidation ◽  
The Self ◽  
Ferrous Oxide ◽  
Antiferromagnetic Coupling ◽  
Oxide Cluster ◽  
Diamine Ligands

<div><div><div><p>Substoichiometric aerobic oxidation of the high-spin organometallic compound (tmeda)Fe(CH2tBu)2 (tmeda = N,N,N’,N’- tetramethylethylenediamine) in toluene or THF solution leads to the self-assembly of a magic-sized all-ferrous oxide cluster containing the Fe9O6 subunit and bearing organometallic and diamine ligands. Mössbauer studies of the cluster and the reference complex (tmeda)Fe(OCPh3)2 are consistent with the all-ferrous assignment, and magnetometry reveal considerable antiferromagnetic coupling between Fe atoms in the cluster and frustrated antiferromagnetic interactions between clusters in the solid state.</p></div></div></div>

scholarly journals Self-assembly of an Organometallic Fe9O6 Cluster from Aerobic Oxidation of (tmeda)Fe(CH2tBu)2

2019 ◽  
Author(s):  
Jonathan Kephart ◽  
Zachary Hecht ◽  
Brooke N. Livesay ◽  
Matthew P. Shores ◽  
V. Codrina Popescu ◽  
...  
Keyword(s):  
Solid State ◽  
High Spin ◽  
Self Assembly ◽  
Organometallic Compound ◽  
Aerobic Oxidation ◽  
The Self ◽  
Ferrous Oxide ◽  
Antiferromagnetic Coupling ◽  
Oxide Cluster ◽  
Diamine Ligands

<div><div><div><p>Substoichiometric aerobic oxidation of the high-spin organometallic compound (tmeda)Fe(CH2tBu)2 (tmeda = N,N,N’,N’- tetramethylethylenediamine) in toluene or THF solution leads to the self-assembly of a magic-sized all-ferrous oxide cluster containing the Fe9O6 subunit and bearing organometallic and diamine ligands. Mössbauer studies of the cluster and the reference complex (tmeda)Fe(OCPh3)2 are consistent with the all-ferrous assignment, and magnetometry reveal considerable antiferromagnetic coupling between Fe atoms in the cluster and frustrated antiferromagnetic interactions between clusters in the solid state.</p></div></div></div>

Rosette Nanotubes: Factors Affecting the Self-assembly of the Monobases Versus the Twin Base System

2007 ◽  
Vol 1057 ◽  
Author(s):  
Usha Hemraz ◽  
Hicham Fenniri
Keyword(s):  
Self Assembly ◽  
The Self ◽  
Dna Bases ◽  
Steric Effects ◽  
Base System ◽  
Factors Affecting ◽  
Rosette Nanotubes

ABSTRACTRosette Nanotubes (RNTs) are formed by the self-assembly of a guanine-cytosine motif (GΛC), a hybrid of the DNA bases guanine and cytosine, to give a six membered macrocycle maintained by 18 H-bonds. In theory, any moiety covalently attached to the GΛC base can be expressed on the nanotubes surface. However we anticipate that the self-assembly and stability of these functionalised RNTs will also be governed by steric effects. Herein we describe the synthesis and the self assembly of the Twin Base Lysine (TBL-K) and its monobase (MBL-K). While TBL-K self-assembles readily in water and methanol to give nanotubular structures, MBL-K does not form nanotubes. Various techniques were used to characterize the RNTs and the factors, preventing self-assembly in the case of MBL-K, were investigated.

Sterically controlled self-assembly of tetrahedral M6L4cages via cationic N-donor ligands

2014 ◽  
Vol 50 (41) ◽  
pp. 5469-5472 ◽  
Author(s):  
Anssi Peuronen ◽  
Samu Forsblom ◽  
Manu Lahtinen
Keyword(s):  
Self Assembly ◽  
The Self ◽  
Donor Ligands ◽  
Steric Effects

Inter-ligand steric effects dictate the self-assembly between tripodal cationic ligandLand MII(M = Cu, Pd) generating an unusual tetrahedral M6L4cage instead of the expected M6L8species.

Probing aromatic, hydrophobic, and steric effects on the self-assembly of an amyloid-β fragment peptide

2011 ◽  
Vol 7 (2) ◽  
pp. 486-496 ◽  
Author(s):  
F. Timur Senguen ◽  
Naomi R. Lee ◽  
Xianfeng Gu ◽  
Derek M. Ryan ◽  
Todd M. Doran ◽  
...  
Keyword(s):  
Self Assembly ◽  
Amyloid Β ◽  
The Self ◽  
Steric Effects

Self-assembly of an organometallic Fe9O6 cluster from aerobic oxidation of (tmeda)Fe(CH2tBu)2

2020 ◽  
Vol 56 (37) ◽  
pp. 4994-4997
Author(s):  
Jonathan A. Kephart ◽  
Zachary Hecht ◽  
Brooke N. Livesay ◽  
Indrani Bhowmick ◽  
Matthew P. Shores ◽  
...  
Keyword(s):  
Self Assembly ◽  
Aerobic Oxidation ◽  
The Self ◽  
Ferrous Oxide ◽  
Oxide Cluster ◽  
Diamine Ligands

Aerobic oxidation of (tmeda)Fe(CH2tBu)2 in toluene or THF solution leads to the self-assembly of a magic-sized all-ferrous oxide cluster containing the Fe9O6 subunit and bearing organometallic and diamine ligands.

The Nature of Rapidly Extracted Phycocyanin from the Blue-Green Alga Plectonema Boryanum

1971 ◽  
Vol 29 ◽  
pp. 366-367
Author(s):  
M. Kessel ◽  
R. MacColl
Keyword(s):  
Self Assembly ◽  
Analytical Ultracentrifugation ◽  
Uranyl Acetate ◽  
The Self ◽  
Major Protein ◽  
Subunit Structure ◽  
Blue Green Alga ◽  
Thin Sections ◽  
Blue Green Algae ◽  
Cacodylate Buffer

The major protein of the blue-green algae is the biliprotein, C-phycocyanin (Amax = 620 nm), which is presumed to exist in the cell in the form of distinct aggregates called phycobilisomes. The self-assembly of C-phycocyanin from monomer to hexamer has been extensively studied, but the proposed next step in the assembly of a phycobilisome, the formation of 19s subunits, is completely unknown. We have used electron microscopy and analytical ultracentrifugation in combination with a method for rapid and gentle extraction of phycocyanin to study its subunit structure and assembly.To establish the existence of phycobilisomes, cells of P. boryanum in the log phase of growth, growing at a light intensity of 200 foot candles, were fixed in 2% glutaraldehyde in 0.1M cacodylate buffer, pH 7.0, for 3 hours at 4°C. The cells were post-fixed in 1% OsO4 in the same buffer overnight. Material was stained for 1 hour in uranyl acetate (1%), dehydrated and embedded in araldite and examined in thin sections.

Interrelationship of the cellular distribution and secretion of regular structure (RS) protein in Bacillus licheniformis nm 105

1992 ◽  
Vol 50 (1) ◽  
pp. 712-713
Author(s):  
Xiaorong Zhu ◽  
Richard McVeigh ◽  
Bijan K. Ghosh
Keyword(s):  
Alkaline Phosphatase ◽  
Bacillus Licheniformis ◽  
Self Assembly ◽  
Gel Electrophoresis ◽  
Culture Supernatant ◽  
Regular Structure ◽  
The Self ◽  
Cellular Distribution ◽  
Structural Protein ◽  
Laboratory Cultures

A mutant of Bacillus licheniformis 749/C, NM 105 exhibits some notable properties, e.g., arrest of alkaline phosphatase secretion and overexpression and hypersecretion of RS protein. Although RS is known to be widely distributed in many microbes, it is rarely found, with a few exceptions, in laboratory cultures of microorganisms. RS protein is a structural protein and has the unusual properties to form aggregate. This characteristic may have been responsible for the self assembly of RS into regular tetragonal structures. Another uncommon characteristic of RS is that enhanced synthesis and secretion which occurs when the cells cease to grow. Assembled RS protein with a tetragonal structure is not seen inside cells at any stage of cell growth including cells in the stationary phase of growth. Gel electrophoresis of the culture supernatant shows a very large amount of RS protein in the stationary culture of the B. licheniformis. It seems, Therefore, that the RS protein is cotranslationally secreted and self assembled on the envelope surface.

Nanoscale Self-Assembly Using Ion and Electron Beam Techniques: A Rapid Review

MRS Advances ◽  
2020 ◽  
Vol 5 (64) ◽  
pp. 3507-3520
Author(s):  
Chunhui Dai ◽  
Kriti Agarwal ◽  
Jeong-Hyun Cho
Keyword(s):  
Electron Beam ◽  
Self Assembly ◽  
Ion Beam ◽  
Three Dimensional ◽  
The Self ◽  
Stress Generation ◽  
Rapid Review ◽  
High Yield ◽  
3D Nanostructures ◽  
Self Assembled

AbstractNanoscale self-assembly, as a technique to transform two-dimensional (2D) planar patterns into three-dimensional (3D) nanoscale architectures, has achieved tremendous success in the past decade. However, an assembly process at nanoscale is easily affected by small unavoidable variations in sample conditions and reaction environment, resulting in a low yield. Recently, in-situ monitored self-assembly based on ion and electron irradiation has stood out as a promising candidate to overcome this limitation. The usage of ion and electron beam allows stress generation and real-time observation simultaneously, which significantly enhances the controllability of self-assembly. This enables the realization of various complex 3D nanostructures with a high yield. The additional dimension of the self-assembled 3D nanostructures opens the possibility to explore novel properties that cannot be demonstrated in 2D planar patterns. Here, we present a rapid review on the recent achievements and challenges in nanoscale self-assembly using electron and ion beam techniques, followed by a discussion of the novel optical properties achieved in the self-assembled 3D nanostructures.

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