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Lewis Structures and Formal Charges02:19

Lewis Structures and Formal Charges

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Lewis symbols can be used to indicate the formation of covalent bonds, which are shown in Lewis structures—drawings that describe the bonding in molecules and polyatomic ions. The periodic table can be used to predict the number of valence electrons in an atom and the number of bonds that will be formed to reach an octet. Group 18 elements, such as argon and helium, have filled electron configurations and thus rarely participate in chemical bonding. However, atoms from group 17, such as...
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Formal Charges

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An acid can be deprotonated to form a conjugate base or an anion. If the produced anion is more stable, then the acid is stronger. On the contrary, if the anion is unstable, then the acid is weaker. Hence, to determine the acidity of the compound, the stability of its conjugate base is studied using various factors.
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In ordinary chemical reactions, the nucleus — which contains the protons and neutrons of each atom and thus identifies the element — remains unchanged. Electrons, however, can be added to atoms by transfer from other atoms, lost by transfer to other atoms, or shared with other atoms. The transfer and sharing of electrons among atoms govern the chemistry of the elements. During the formation of some compounds, atoms gain or lose electrons to form electrically charged particles called...
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Molecular structure elucidation with charge-state control.

Shadi Fatayer1, Florian Albrecht2, Yunlong Zhang3

  • 1IBM Research-Zurich, Rueschlikon 8803, Switzerland. sfa@zurich.ibm.com lgr@zurich.ibm.com.

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Summary
This summary is machine-generated.

Researchers controlled the charge state of organic molecules on sodium chloride films. Atomic force microscopy revealed distinct structures and properties for neutral, cationic, anionic, and dianionic states, advancing molecular electronics and on-surface synthesis.

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Area of Science:

  • Surface Science and Nanotechnology
  • Molecular Electronics
  • Organic Chemistry

Background:

  • Molecular charge state significantly influences physicochemical properties like conformation and reactivity.
  • Understanding these properties is crucial for applications in catalysis, photoconversion, and molecular electronics.
  • Previous studies often lacked atomic-level control and resolution of charge state effects on individual molecules.

Purpose of the Study:

  • To control and investigate the impact of varying molecular charge states on organic molecules.
  • To achieve atomic resolution imaging and bond-order discrimination for molecules in different charge states.
  • To explore charge state-dependent changes in conformation, adsorption, aromaticity, and conjugation.

Main Methods:

  • Utilized insulating, multilayer sodium chloride (NaCl) films as a substrate.
  • Employed atomic force microscopy (AFM) with carbon monoxide (CO)-functionalized tips.
  • Resolved molecular structures and bond orders for neutral, cationic, anionic, and dianionic states.

Main Results:

  • Successfully controlled and characterized the charge states of azobenzene, tetracyanoquinodimethane, and pentacene.
  • Detected significant changes in molecular conformation, adsorption geometry, and bond-order relations across charge states.
  • Observed charge state-dependent alterations in aromaticity and conjugation pathways for porphine.

Conclusions:

  • Demonstrated precise control over molecular charge states on insulating surfaces.
  • Provided atomic-resolution insights into structure-property relationships as a function of charge.
  • Opened new avenues for studying chemical-structural dynamics of individual molecules across a broad range of charge states.