Design of a flexible organometallic tecton: host–guest chemistry with picric acid and self-assembly of platinum macrocycles

2017 ◽  
Vol 46 (6) ◽  
pp. 1986-1995 ◽  
Author(s):  
Achintya Jana ◽  
Sourav Bhowmick ◽  
Supreet Kaur ◽  
Hemant K. Kashyap ◽  
Neeladri Das
Keyword(s):  
Binding Affinity ◽  
Self Assembly ◽  
Organometallic Compound ◽  
Picric Acid ◽  
The Self ◽  
Guest Chemistry

A new “flexible” and ditopic Pt(ii) organometallic compound is a tecton for the self-assembly of neutral metallacycles. It also exhibits significant binding affinity for picric acid.

scholarly journals Non-lithographic patterning of phage-displayed peptides with wrinkled elastomers

2014 ◽  
Vol 11 (91) ◽  
pp. 20130893 ◽  
Author(s):  
Swathi Swaminathan ◽  
Mitchell Bullough ◽  
Qifei Li ◽  
Anhong Zhou ◽  
Yue Cui
Keyword(s):  
Phage Display ◽  
Binding Affinity ◽  
Hybrid Materials ◽  
Self Assembly ◽  
The Self ◽  
Powerful Method ◽  
Pdms Film ◽  
Lithographic Patterning ◽  
Surface And Interface ◽  
Enhanced Selectivity

The development of controlled patterning of phage (viruses) could expand opportunities for both fundamental studies and creating various materials platforms. Inducing the elastomeric instability of PDMS film provides a non-lithographic, tuneable, controlled method for generating micro/nanoscale wrinkle patterns. Phage display has emerged as a powerful method for selecting peptides that possess enhanced selectivity and binding affinity toward a variety of targets. In this report, we demonstrate the non-lithographic patterning of phage-displayed peptides with wrinkled elastomers. Our results show that the phage-displayed peptides can be patterned on specific locations in controlled and tuneable ways, be transferred to other substrates and induce the self-assembly of hybrid materials. We anticipate that these results could open up exciting opportunities in fundamental studies and in applications ranging from sensors, hybrid materials, self-assembly, surface and interface, to micro/nanoelectronics.

Tunable multi-color luminescence from a self-assembled cyanostilbene and cucurbit[7]uril in aqueous media

2020 ◽  
Vol 56 (4) ◽  
pp. 655-658 ◽  
Author(s):  
Shubhra Kanti Bhaumik ◽  
Supratim Banerjee
Keyword(s):  
Self Assembly ◽  
Aqueous Media ◽  
The Self ◽  
Supramolecular System ◽  
Self Assembled ◽  
Guest Chemistry

A tunable multicolor luminescent supramolecular system was designed in aqueous media employing the self-assembly of a cationic amphiphilic cyanostilbene and the host–guest chemistry of cucurbit[7]uril.

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>

A new supramolecular catalytic system: the self-assembly of Rh8 cage host anthracene molecules for [4 + 4] cycloaddition induced by UV irradiation

2020 ◽  
Vol 49 (28) ◽  
pp. 9688-9693
Author(s):  
Wei-Bin Yu ◽  
Feng-Yi Qiu ◽  
Po Sun ◽  
Hua-Tian Shi ◽  
Zhi-Feng Xin
Keyword(s):  
Uv Irradiation ◽  
Catalytic System ◽  
Self Assembly ◽  
Uv Light ◽  
Cycloaddition Reaction ◽  
Supramolecular Assembly ◽  
The Self ◽  
Supramolecular System ◽  
Guest Molecules ◽  
Guest Chemistry

The supramolecular assembly is significant in host–guest chemistry. In this work, a new supramolecular system assembled through a distorted cuboid was introduced. Moreover, the [4 + 4] cycloaddition reaction of the guest molecules was further studied under UV light.

scholarly journals Supramolecular switching of the self-assembly of cyclic peptide–polymer conjugates via host–guest chemistry

2019 ◽  
Vol 55 (36) ◽  
pp. 5291-5294 ◽  
Author(s):  
Qiao Song ◽  
Jie Yang ◽  
Julia Y. Rho ◽  
Sébastien Perrier
Keyword(s):  
Self Assembly ◽  
Cyclic Peptide ◽  
The Self ◽  
Polymer Conjugates ◽  
Guest Chemistry

A supramolecular strategy of switching the self-assembly of cyclic peptide–polymer conjugates using host–guest chemistry is proposed.

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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