Facile Self-Assembly of Predesigned Neutral 2D Pt-Macrocycles via a New Class of Rigid Oxygen Donor Linkers

2003 ◽  
Vol 125 (46) ◽  
pp. 13950-13951 ◽  
Author(s):  
Neeladri Das ◽  
Partha Sarathi Mukherjee ◽  
Atta M. Arif ◽  
Peter J. Stang
Keyword(s):  
Self Assembly ◽  
New Class ◽  
Oxygen Donor

A Bottom-Up Approach to Solution-Processed, Atomically Precise Graphitic Cylinders on Surfaces

2018 ◽  
Author(s):  
Erik Leonhardt ◽  
Jeff M. Van Raden ◽  
David Miller ◽  
Lev N. Zakharov ◽  
Benjamin Aleman ◽  
...  
Keyword(s):  
Self Assembly ◽  
Carbon Nanostructures ◽  
Carbon Nanomaterials ◽  
Circle Packing ◽  
Pyrolytic Graphite ◽  
Building Blocks ◽  
Bottom Up ◽  
Casting Technique ◽  
New Class ◽  
Solution Casting Technique

Extended carbon nanostructures, such as carbon nanotubes (CNTs), exhibit remarkable properties but are difficult to synthesize uniformly. Herein, we present a new class of carbon nanomaterials constructed via the bottom-up self-assembly of cylindrical, atomically-precise small molecules. Guided by supramolecular design principles and circle packing theory, we have designed and synthesized a fluorinated nanohoop that, in the solid-state, self-assembles into nanotube-like arrays with channel diameters of precisely 1.63 nm. A mild solution-casting technique is then used to construct vertical “forests” of these arrays on a highly-ordered pyrolytic graphite (HOPG) surface through epitaxial growth. Furthermore, we show that a basic property of nanohoops, fluorescence, is readily transferred to the bulk phase, implying that the properties of these materials can be directly altered via precise functionalization of their nanohoop building blocks. The strategy presented is expected to have broader applications in the development of new graphitic nanomaterials with π-rich cavities reminiscent of CNTs.

Structural organization and molecular self-assembly of a new class of polar and non-polar four-ring based bent-core molecules

2019 ◽  
Vol 295 ◽  
pp. 111687 ◽  
Author(s):  
Supreet Kaur ◽  
Golam Mohiuddin ◽  
Vidhika Punjani ◽  
Raj Kumar Khan ◽  
Sharmistha Ghosh ◽  
...  
Keyword(s):  
Self Assembly ◽  
Structural Organization ◽  
New Class

Self-assembly of a new class of amphiphilic poly(amidoamine) dendrimers and their electrochemical properties

2005 ◽  
Vol 43 (22) ◽  
pp. 5512-5519 ◽  
Author(s):  
Bing-Bing Wang ◽  
Xin Zhang ◽  
Xin-Ru Jia ◽  
Zi-Chen Li ◽  
Yan Ji ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Self Assembly ◽  
New Class

scholarly journals Advanced opto-electronics materials by fullerene and acetylene scaffolding

2005 ◽  
Vol 77 (11) ◽  
pp. 1851-1863 ◽  
Author(s):  
François Diederich
Keyword(s):  
Electronic Properties ◽  
Self Assembly ◽  
Weak Interactions ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Conjugated Systems ◽  
New Class ◽  
Polydisperse Polymer ◽  
Fundamental Research ◽  
Storage Properties

Functional π-systems with unusual opto-electronic properties are intensively investigated from both fundamental research and technological application viewpoints. This article reports on novel π-conjugated systems obtained by acetylenic and fullerene scaffolding. Linearly conjugated acetylenic nanorods, consisting of monodisperse poly(triacetylene) (PTA) oligomers and extending up to 18 nm length, were prepared to investigate the limits of effective conjugation and to explore at which length a monodisperse oligomer reaches the properties of an infinite polydisperse polymer. With the cyanoethynylethenes (CEEs), a powerful new class of electron acceptors is introduced that undergo intense intramolecular charge-transfer (CT) interactions with appended donors. Macrocyclic scaffolds with unusual opto-electronic properties are perethynylated dehydroannulenes, expanded radialenes, and radiaannulenes bearing peripheral dialkylanilino donor groups. Extended porphyrin-fullerene conjugates are investigated for their novel photophysical and efficient multicharge storage properties. Self-assembly of fullerenes and porphyrins, governed by weak interactions between the two components, leads to unprecedented nanopatterned surfaces that are investigated by scanning tunneling microscopy (STM).

scholarly journals Depsipeptide nucleic acids: prebiotic formation, oligomerization, and self-assembly of a new candidate proto-nucleic acid

2020 ◽  
Author(s):  
David M. Fialho ◽  
Suneesh C. Karunakaran ◽  
Katherine W. Greeson ◽  
Isaac Martínez ◽  
Gary B. Schuster ◽  
...  
Keyword(s):  
Nucleic Acid ◽  
Nucleic Acids ◽  
Self Assembly ◽  
Rna World ◽  
Chemical Components ◽  
Early Earth ◽  
New Class ◽  
Self Assembling ◽  
World Hypothesis ◽  
Rna World Hypothesis

AbstractThe mechanism by which genetic polymers spontaneously formed on the early Earth is currently unknown. The RNA World hypothesis implies that RNA oligomers were produced prebiotically, but the demonstration of this process has proven challenging. Alternatively, RNA may be the product of evolution and some, or all, of its chemical components may have been preceded by functionally analogous moieties that were more readily accessible under plausible early-Earth conditions. We report a new class of nucleic acid analog, depsipeptide nucleic acid, which displays several properties that make it an attractive candidate for the first informational polymer to arise on the Earth. The monomers of depsipeptide nucleic acids can form under plausibly prebiotic conditions. These monomers oligomerize spontaneously when dried from aqueous solutions to form nucleobase-functionalized depsipeptides. Once formed, these depsipeptide nucleic acid oligomers are capable of complementary self-assembly, and are resistant to hydrolysis in the assembled state. These results suggest that the initial formation of primitive, self-assembling, informational polymers may have been relatively facile.

scholarly journals A new class of disordered elements controls DNA replication through initiator self-assembly

eLife ◽  
2019 ◽  
Vol 8 ◽  
Author(s):  
Matthew W Parker ◽  
Maren Bell ◽  
Mustafa Mir ◽  
Jonchee A Kao ◽  
Xavier Darzacq ◽  
...  
Keyword(s):  
Dna Replication ◽  
Self Assembly ◽  
Origin Recognition Complex ◽  
Replication Initiation ◽  
Linear Arrangement ◽  
New Class ◽  
Intrinsically Disordered ◽  
Intrinsically Disordered Regions ◽  
Liquid Liquid Phase Separation

The initiation of DNA replication in metazoans occurs at thousands of chromosomal sites known as origins. At each origin, the Origin Recognition Complex (ORC), Cdc6, and Cdt1 co-assemble to load the Mcm2-7 replicative helicase onto chromatin. Current replication models envisage a linear arrangement of isolated origins functioning autonomously; the extent of inter-origin organization and communication is unknown. Here, we report that the replication initiation machinery of D. melanogaster unexpectedly undergoes liquid-liquid phase separation (LLPS) upon binding DNA in vitro. We find that ORC, Cdc6, and Cdt1 contain intrinsically disordered regions (IDRs) that drive LLPS and constitute a new class of phase separating elements. Initiator IDRs are shown to regulate multiple functions, including chromosome recruitment, initiator-specific co-assembly, and Mcm2-7 loading. These data help explain how CDK activity controls replication initiation and suggest that replication programs are subject to higher-order levels of inter-origin organization.

A Bottom-Up Approach to Solution-Processed, Atomically Precise Graphitic Cylinders on Surfaces

2018 ◽  
Author(s):  
Erik Leonhardt ◽  
Jeff M. Van Raden ◽  
David Miller ◽  
Lev N. Zakharov ◽  
Benjamin Aleman ◽  
...  
Keyword(s):  
Self Assembly ◽  
Carbon Nanostructures ◽  
Carbon Nanomaterials ◽  
Circle Packing ◽  
Pyrolytic Graphite ◽  
Building Blocks ◽  
Bottom Up ◽  
Casting Technique ◽  
New Class ◽  
Solution Casting Technique

Extended carbon nanostructures, such as carbon nanotubes (CNTs), exhibit remarkable properties but are difficult to synthesize uniformly. Herein, we present a new class of carbon nanomaterials constructed via the bottom-up self-assembly of cylindrical, atomically-precise small molecules. Guided by supramolecular design principles and circle packing theory, we have designed and synthesized a fluorinated nanohoop that, in the solid-state, self-assembles into nanotube-like arrays with channel diameters of precisely 1.63 nm. A mild solution-casting technique is then used to construct vertical “forests” of these arrays on a highly-ordered pyrolytic graphite (HOPG) surface through epitaxial growth. Furthermore, we show that a basic property of nanohoops, fluorescence, is readily transferred to the bulk phase, implying that the properties of these materials can be directly altered via precise functionalization of their nanohoop building blocks. The strategy presented is expected to have broader applications in the development of new graphitic nanomaterials with π-rich cavities reminiscent of CNTs.

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