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Related Concept Videos

Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
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Vanillin—a flavoring agent in vanilla, cinnamaldehyde—a molecule responsible for the distinct smell of cinnamon, and acetone—a strong-smelling ingredient in nail polish removers, all belong to a class of carbonyl compounds called aldehydes and ketones (Figure 1). Although both aldehydes and ketones contain the characteristic carbonyl (C=O) bond, their chemical structures vary with respect to the groups directly attached to the carbonyl carbon.
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Ethers can be prepared from organic compounds by various methods. Some of them are discussed below,
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Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
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2D oriented covalent organic frameworks for alcohol-sensory synapses.

Teng Li1, Hongliang Yu, Ziyu Xiong

  • 1Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen 518060, P. R. China. sutinghan@szu.edu.cn.

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This study introduces 2D covalent organic framework (COF) resistive random access memory (RRAM) devices that overcome variability issues. These electroforming-free COF RRAMs enable stable, high-performance data storage and neuromorphic computing applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electronics

Background:

  • Resistive random access memories (RRAMs) are promising for data storage and neuromorphic computing.
  • Electrochemical metallization mechanism (ECM) RRAMs suffer from high variability due to random conductive filament (CF) formation, limiting AI applications.

Purpose of the Study:

  • To develop electroforming-free RRAM devices with reduced variability and enhanced performance.
  • To explore the potential of 2D covalent organic frameworks (COFs) in RRAM applications.
  • To demonstrate gas-mediated multilevel resistive switching and sensor applications.

Main Methods:

  • Fabrication of 2D covalent organic framework (COF) based RRAM devices.
  • Investigation of electroforming-free resistive switching behavior and filament formation.
  • Utilization of alcohol vapors for gas-mediated multilevel resistive switching.
  • Integration of COF RRAM with k-nearest neighbors (KNN) algorithm for alcohol gas recognition.

Main Results:

  • Demonstrated electroforming-free resistive switching with low spatial/temporal variations and excellent retention (up to 10^5 s).
  • Utilized oriented COF-5 film to confine filament shape and modulate ion movement.
  • Achieved gas-mediated multilevel resistive switching via COF absorption of alcohol vapors.
  • Developed an alcohol gas recognition system with 87.2% accuracy.
  • Emulated alcohol inhibition stimulation in the human nervous system.

Conclusions:

  • 2D COF RRAM offers a viable solution to the variability challenges in ECM devices.
  • COF-based RRAMs exhibit promising characteristics for advanced data storage, neuromorphic computing, and sensing applications.
  • The ability to modulate conductivity with gas molecules opens new avenues for sensor development.