scholarly journals Phosphorescent Organometallic Knots of Gold(I)-Bis(acetylide) Strands Directed by Copper(I) π-Coordination

2021 ◽  
Author(s):  
Zhong-Ning Chen ◽  
Ya-Zi Huang ◽  
Jin-Yun Wang ◽  
Zhu Jiao ◽  
Pei Xie
Keyword(s):  
Ambient Temperature ◽  
Self Assembly ◽  
Ligand Design ◽  
The Self ◽  
Triplet States ◽  
Tert Butyl ◽  
Solid States ◽  
Trefoil Knot ◽  
Coordination Bonds ◽  
Double Folding

Abstract Through elaborate ligand design to create knotted structures with specific topologies is a major challenge for chemists. In this work, the self-assembly between U-shape 3,6-di-tert-butyl-1,8-diethynyl-9H-carbazole (H2L) and Au+ through gold(I)-bis(acetylide) linkages under π-bonded Cu+ template gives rise to complex 1 with two interlocked metallostrands as well as complexes 3 (n = 3) and 4 (n = 4) with [(AuL)n]n- metallostrands showing trefoil knot topology. Upon incorporating two [Au(dppb)Au]2+ (dppb = Ph2P(CH2)4PPh2) moieties through bis(Au-acetylide) coordination bonds, the interlocked structure (1) is fully closed to form a figure-eight knotted structure in complex 2. The folding and threading of metallocyclic strings are directed by Cu+, which are π-ligated to two or three acetylides to generate double-folding or triple-folding cross points. Complexes 1-4 show intense phosphorescence in both solutions and solid states at ambient temperature, originating from admixture of metal centered 3[d®p/s], 3IL (intraligand), and 3[p (L) ® s/p (Au/Cu)] 3LMCT triplet states.

Photo- and thermo-induced spin crossover in a cyanide-bridged {MoV2FeII2} rhombus molecule

2014 ◽  
Vol 50 (22) ◽  
pp. 2893-2895 ◽  
Author(s):  
Abhishake Mondal ◽  
Yanling Li ◽  
Lise-Marie Chamoreau ◽  
Mannan Seuleiman ◽  
Lionel Rechignat ◽  
...  
Keyword(s):  
Ambient Temperature ◽  
Self Assembly ◽  
Low Temperatures ◽  
Spin Crossover ◽  
Laser Light ◽  
The Self ◽  
Light Irradiation

The self-assembly of [MoV(CN)8]3− and [FeII(bik)2(S)2]2+ affords a cyanide-bridged {MoV2FeII2} rhombus molecule that shows photomagnetic effect under laser light irradiation at low temperatures and exhibits thermo-induced spin crossover near ambient temperature.

3,3′-Di(pyrazinamoyl)-2,2′-bipyridine: rational ligand design for the self-assembly of a 1-D coordination polymer

2015 ◽  
Vol 44 (4) ◽  
pp. 1866-1874 ◽  
Author(s):  
Nicholas J. Hurley ◽  
Jeremy M. Rawson ◽  
Melanie Pilkington
Keyword(s):  
Coordination Polymer ◽  
Self Assembly ◽  
Ligand Design ◽  
The Self ◽  
Polydentate Ligand ◽  
Binding Domains ◽  
1D Coordination Polymer ◽  
Rational Ligand Design

A new pyrazine functionalized polydentate ligand with distinct binding domains facilitates the self-assembly of a unique paddlewheel bridged 1D coordination polymer of formula {[Cu3(L3)2(Cl)2(OAc)6]·2H2O·2MeOH}n that has been structurally and magnetically characterized.

Tuning the self-assembly of lanthanide triple stranded heterobimetallic helicates by ligand design

2008 ◽  
pp. 1027-1036 ◽  
Author(s):  
Thomas B. Jensen ◽  
Rosario Scopelliti ◽  
Jean-Claude G. Bünzli
Keyword(s):  
Self Assembly ◽  
Ligand Design ◽  
The Self

Helical Porous Protein Mimics Self-Assembled from Amphiphilic Dendritic Dipeptides

2005 ◽  
Vol 58 (6) ◽  
pp. 472 ◽  
Author(s):  
Virgil Percec ◽  
Andrés Dulcey ◽  
Mihai Peterca ◽  
Monica Ilies ◽  
Yoshiko Miura ◽  
...  
Keyword(s):  
Self Assembly ◽  
Transmembrane Proteins ◽  
Supramolecular Assemblies ◽  
The Self ◽  
Supramolecular Polymers ◽  
Protein Mimics ◽  
New Class ◽  
Solid States ◽  
Self Assembled

This manuscript reports the synthesis and the self-assembly of (4-3,4,5-3,5)nG2-CH2-Boc-l-Tyr-l-Ala-OMe dendritic dipeptides (n = 12, 16). These dendritic dipeptides self-assemble both in solution and in solid states into helical porous supramolecular columns that mimic porous transmembrane proteins. These supramolecular assemblies provide also a new class of tubular supramolecular polymers.

Tuning the self-assembly and luminescence properties of lanthanide coordination polymers by ligand design

2008 ◽  
pp. 3582 ◽  
Author(s):  
Xue-Qin Song ◽  
Wei-Sheng Liu ◽  
Wei Dou ◽  
Jiang-Rong Zheng ◽  
Xiao-Liang Tang ◽  
...  
Keyword(s):  
Coordination Polymers ◽  
Self Assembly ◽  
Ligand Design ◽  
The Self ◽  
Luminescence Properties ◽  
Lanthanide Coordination Polymers

A turn-on fluorogenic Zn(ii) chemoprobe based on a terpyridine derivative with aggregation-induced emission (AIE) effects through nanofiber aggregation into spherical aggregates

2015 ◽  
Vol 51 (5) ◽  
pp. 952-955 ◽  
Author(s):  
Sung Ho Jung ◽  
Ki-Young Kwon ◽  
Jong Hwa Jung
Keyword(s):  
Self Assembly ◽  
The Self ◽  
Strong Emission ◽  
Aggregation Induced Emission ◽  
Turn On ◽  
Emission Effect ◽  
Coordination Bonds

The self-assembly of the terpyridine-based ligand exhibited strong emission in the presence of Zn2+ due to the formation of coordination bonds between the terpyridine moieties and the Zn2+ by the aggregation-induced emission effect.

Kinetic and Thermodynamic Effects in the Self-Assembly of [3]Catenanes in the Solution and Solid States

1998 ◽  
Vol 4 (3) ◽  
pp. 460-468 ◽  
Author(s):  
David B. Amabilino ◽  
Peter R. Ashton ◽  
J. Fraser Stoddart ◽  
A. J. P. White ◽  
David J. Williams
Keyword(s):  
Self Assembly ◽  
The Self ◽  
Solid States ◽  
Thermodynamic Effects

Controllable photophysical properties and self-assembly of siloxane-poly(amidoamine) dendrimers

2015 ◽  
Vol 17 (40) ◽  
pp. 26783-26789 ◽  
Author(s):  
Hang Lu ◽  
Jie Zhang ◽  
Shengyu Feng
Keyword(s):  
Metal Ions ◽  
Self Assembly ◽  
Photophysical Properties ◽  
The Self ◽  
Carbonyl Groups ◽  
Strong Luminescence ◽  
Coordination Bonds

Siloxane–poly(amidoamine) dendrimers (Si–PAMAM) can emit strong luminescence due to the aggregation of carbonyl groups, induced by N → Si coordination bonds. So the fluorescence of Si–PAMAM could be adjusted by solvents, H+, metal ions, and dendrimer structures. Micron-sized tube were observed in water–methanol due to the self-assembly of Si–PAMAM.

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.

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