[structures: see text] The synthesis and optical properties of a series of multinanometer-sized substructures of the phenyl-diacetylene carbon allotrope, graphdiyne, are described. These molecules are among the largest and most complex annulenic systems yet prepared, with extension of linear conjugation in two-dimensions to over twice that of any previously reported planar macrocycle. The graphdiyne substructures are constructed through convergent syntheses, taking advantage of three key intermediates and silane-protected phenylacetylenes. Intramolecular macrocyclization of alpha,omega-polyyne precursors via Cu-mediated or Pd-catalyzed oxidative homocoupling affords five new graphdiyne "oligomers" possessing two to four fused 18-membered rings. The attempted synthesis of a six-ring analogue is also reported.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1021/jo050926v | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Impact of Ligand Structure on Biological Activity and Photophysical Properties of NHC-Protected Au Nanoclusters.
J Am Chem Soc
January 2025
Department of Chemistry, Queen's University, Kingston, Ontario K7L 3N6, Canada.
N-heterocyclic carbene (NHC)-protected gold nanoclusters display high stability and high photoluminescence, making them well-suited for fluorescence imaging and photodynamic therapeutic applications. We report herein the synthesis of two bisNHC-protected Au nanoclusters with π-extended aromatic systems. Depending on the position of the π-extended aromatic system, changes to the structure of the ligand shell in the cluster are observed, with the ability to correlate increases in rigidity with increases in fluorescence quantum yield.
View Article and Find Full Text PDFDiving into Unknown Waters: Water-Soluble Clickable Au Nanoclusters Protected with N-Heterocyclic Carbenes for Bio-Medical Applications.
J Am Chem Soc
January 2025
Department of Chemistry, Queen's University, Chernoff Hall, Kingston, Ontario K7L 3N6, Canada.
The use of gold nanoclusters in biomedical applications has been steadily increasing in recent years. However, water solubility is a key factor for these applications, and water-soluble gold nanoclusters are often difficult to isolate and susceptible to exchange or oxidation in vivo. Herein, we report the isolation of N-heterocyclic carbene (NHC)-protected atomically precise gold nanoclusters functionalized with triethylene glycol monomethyl ether groups.
View Article and Find Full Text PDFTernary NASICON-Type NaVMnFe(PO)/NC@CNTs Cathode with Reversible Multielectron Reaction and Long Life for Na-Ion Batteries.
ACS Appl Mater Interfaces
January 2025
Key Laboratory of Low Carbon Energy and Chemical Engineering of Gansu Province, Lanzhou 730050, China.
Na superionic conductor (NASICON)-structure NaMnV(PO) (NVMP) electrode materials reveal highly attractive application prospects due to ultrahigh energy density originating from two-electron reactions. Nevertheless, NVMP also encounters challenges with its poor electronic conductivity, Mn dissolution, and Jahn-Teller distortion. To address this issue, utilizing N-doped carbon layers and carbon nanotubes (CNTs) for dual encapsulation enhances the material's electronic conductivity, creating an effective electron transport network that promotes the rapid diffusion and storage of Na.
View Article and Find Full Text PDFComparative metagenomics of tropical reef fishes show conserved core gut functions across hosts and diets with diet-related functional gene enrichments.
Appl Environ Microbiol
January 2025
School of Marine Science and Policy, University of Delaware, Lewes, Delaware, USA.
Unlabelled: Fish gut microbial communities are important for the breakdown and energy harvesting of the host diet. Microbes within the fish gut are selected by environmental and evolutionary factors. To understand how fish gut microbial communities are shaped by diet, three tropical fish species (hawkfish, ; yellow tang, ; and triggerfish, ) were fed piscivorous (fish meal pellets), herbivorous (seaweed), and invertivorous (shrimp) diets, respectively.
View Article and Find Full Text PDFSupramolecular Organic Nanofiller: A New Reinforcement Strategy for Dynamic Covalent Polymer Networks Toward Upcycling of Carbon Fiber Composites.
Adv Mater
January 2025
Faculty of Materials Science and Engineering, South China University of Technology, Guangzhou, 510640, P. R. China.
Dynamic covalent polymer networks (DCPN) provide an important solution to the challenging recyclability of thermoset elastomers. However, dynamic bonds exhibit relatively weak bond energies, considerably decreasing the mechanical properties of DCPN. Herein, a novel reinforcement strategy for DCPN involving the in situ formation of supramolecular organic nanofillers through asynchronous polymerization is proposed.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!