Self-assembly of platinum(ii) 6-phenyl-2,2′-bipyridine complexes with solvato- and iono-chromic phenomena

2019 ◽  
Vol 55 (2) ◽  
pp. 229-232 ◽  
Author(s):  
Jiangjun Chen ◽  
Lei Ao ◽  
Chengpeng Wei ◽  
Cong Wang ◽  
Feng Wang
Keyword(s):  
Self Assembly ◽  
The Self ◽  
Metal Interactions ◽  
Metal Metal

Mono- and di-nuclear platinum(ii) 6-phenyl-2,2′-bipyridine complexes display intriguing chromic phenomena, by manipulating Pt⋯Pt metal–metal interactions for the self-assembly processes.

scholarly journals Self-assembly of alkynylplatinum(II) terpyridine amphiphiles into nanostructures via steric control and metal–metal interactions

2016 ◽  
Vol 113 (11) ◽  
pp. 2845-2850 ◽  
Author(s):  
Sammual Yu-Lut Leung ◽  
Keith Man-Chung Wong ◽  
Vivian Wing-Wah Yam
Keyword(s):  
Self Assembly ◽  
Phenylene Ethynylene ◽  
Temperature Dependent ◽  
Visible Absorption ◽  
Metal Interactions ◽  
Assembly Mechanism ◽  
Metal Metal ◽  
End Capping ◽  
Supramolecular Polymerization

A series of mono- and dinuclear alkynylplatinum(II) terpyridine complexes containing the hydrophilic oligo(para-phenylene ethynylene) with two 3,6,9-trioxadec-1-yloxy chains was designed and synthesized. The mononuclear alkynylplatinum(II) terpyridine complex was found to display a very strong tendency toward the formation of supramolecular structures. Interestingly, additional end-capping with another platinum(II) terpyridine moiety of various steric bulk at the terminal alkyne would lead to the formation of nanotubes or helical ribbons. These desirable nanostructures were found to be governed by the steric bulk on the platinum(II) terpyridine moieties, which modulates the directional metal−metal interactions and controls the formation of nanotubes or helical ribbons. Detailed analysis of temperature-dependent UV-visible absorption spectra of the nanostructured tubular aggregates also provided insights into the assembly mechanism and showed the role of metal−metal interactions in the cooperative supramolecular polymerization of the amphiphilic platinum(II) complexes.

scholarly journals Regulation of the Switchable Luminescence of Tridentate Platinum(II) Complexes by Photoisomerization

2021 ◽  
Vol 8 ◽  
Author(s):  
Yongguang Li ◽  
Yuexuan Fei ◽  
Hongcheng Sun ◽  
Shuangjiang Yu ◽  
Junqiu Liu
Keyword(s):  
Self Assembly ◽  
Luminescent Properties ◽  
Vital Role ◽  
Dual Emission ◽  
Supramolecular Materials ◽  
Metal Interactions ◽  
Ligand Charge Transfer ◽  
Metal Metal ◽  
Flat Structures ◽  
External Stimuli

Organoplatinum (II) complexes are promising candidates for the construction of smart supramolecular materials due to their unique flat structures. This accompanied by intriguing luminescent properties, prompts the molecules to aggregate after external stimuli. Nevertheless, the utilization of photo-responsive subunits to modulate their assemble behaviors and functions are still rarely explored. In this work, azobenzene (azo)-appended tridentate platinum (II) complexes with different linkers have been designed and synthesized. The intermolecular hydrogen bonding, π-π stacking, and metal-metal interactions were finely controlled through the tiny alteration of the linkers, which was found to play a vital role in self-assembly, and photophysical and photoisomerization properties. Some of them exhibited dual emission bands originating from metal-perturbed triplet intraligand (3IL) and metal-metal to ligand charge transfer (3MMLCT) excited states due to the different intermolecular interactions. Based on this, the manipulation of switchable luminescence as well as the controllable morphologies have been realized by photoisomerization.

Polymer-Induced Self-Assembly of Alkynylplatinum(II) Terpyridyl Complexes by Metal???Metal/????? Interactions

2005 ◽  
Vol 44 (5) ◽  
pp. 791-794 ◽  
Author(s):  
Cong Yu ◽  
Keith Man-Chung Wong ◽  
Kenneth Hoi-Yiu Chan ◽  
Vivian Wing-Wah Yam
Keyword(s):  
Self Assembly ◽  
Metal Interactions ◽  
Metal Metal

scholarly journals Colloidal Self-Assembly of Inorganic Nanocrystals into Superlattice Thin-Films and Multiscale Nanostructures

Nanomaterials ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 1243 ◽  
Author(s):  
Hongseok Yun ◽  
Taejong Paik
Keyword(s):  
Thin Films ◽  
Self Assembly ◽  
Building Blocks ◽  
The Self ◽  
Large Area ◽  
Metal Metal ◽  
Inorganic Thin Films ◽  
Inorganic Nanocrystals ◽  
Superlattice Structures ◽  
Thin Film Patterning

The self-assembly of colloidal inorganic nanocrystals (NCs) offers tremendous potential for the design of solution-processed multi-functional inorganic thin-films or nanostructures. To date, the self-assembly of various inorganic NCs, such as plasmonic metal, metal oxide, quantum dots, magnetics, and dielectrics, are reported to form single, binary, and even ternary superlattices with long-range orientational and positional order over a large area. In addition, the controlled coupling between NC building blocks in the highly ordered superlattices gives rise to novel collective properties, providing unique optical, magnetic, electronic, and catalytic properties. In this review, we introduce the self-assembly of inorganic NCs and the experimental process to form single and multicomponent superlattices, and we also describe the fabrication of multiscale NC superlattices with anisotropic NC building blocks, thin-film patterning, and the supracrystal formation of superlattice structures.

Polymer-Induced Self-Assembly of Alkynylplatinum(II) Terpyridyl Complexes by Metal???Metal/????? Interactions

2005 ◽  
Vol 117 (5) ◽  
pp. 801-804 ◽  
Author(s):  
Cong Yu ◽  
Keith Man-Chung Wong ◽  
Kenneth Hoi-Yiu Chan ◽  
Vivian Wing-Wah Yam
Keyword(s):  
Self Assembly ◽  
Metal Interactions ◽  
Metal Metal

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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