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Related Concept Videos

Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
Intermolecular Forces03:13

Intermolecular Forces

Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen bonds, and dispersion...
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Atomic Radii and Effective Nuclear Charge

The elements in groups of the periodic table exhibit similar chemical behavior. This similarity occurs because the members of a group have the same number and distribution of electrons in their valence shells.
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Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...

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An implicit solvent model for SCC-DFTB with Charge-Dependent Radii.

Guanhua Hou1, Xiao Zhu, Qiang Cui

  • 1Department of Chemistry and Theoretical Chemistry Institute, University of Wisconsin, Madison, 1101 University Ave, Madison, WI 53706.

Journal of Chemical Theory and Computation
|August 17, 2010
PubMed
Summary
This summary is machine-generated.

We developed a new implicit solvent model for Self-Consistent Charge Density Functional Theory (SCC-DFTB) to quickly study charged chemical reactions. This model accurately predicts solvation free energies, aiding in reaction mechanism exploration.

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Area of Science:

  • Computational Chemistry
  • Theoretical Chemistry

Background:

  • Exploring chemical reaction mechanisms involving highly charged species requires efficient computational methods.
  • Accurate solvation free energy calculations are crucial for understanding reactions in solution.

Purpose of the Study:

  • To develop and validate an implicit solvent model for Self-Consistent Charge Density Functional Theory (SCC-DFTB).
  • To enable rapid exploration of potential energy surfaces for reactions with highly charged species.

Main Methods:

  • Implemented an implicit solvent model combining Poisson-Boltzmann electrostatics and surface-area terms.
  • Atomic radii were made dependent on solute charge distribution and solved self-consistently.
  • Used Mulliken charges to define atomic radii linearly dependent on charge distribution.

Main Results:

  • The SCC-DFTB solvation model achieved accuracy comparable to the SM6 model, particularly for ions.
  • The model demonstrated favorable computational speed and provided analytical first derivatives.
  • Applied the model to analyze the hydrolysis of mono-methyl mono-phosphate ester (MMP) and tri-methyl mono-phosphate ester (TMP).

Conclusions:

  • The developed SCC-DFTB implicit solvent model is effective for studying solution-phase reaction mechanisms.
  • The model offers a computationally efficient alternative for accurate solvation free energy calculations.
  • The charge-dependent atomic radii improve the treatment of species with varying charge distributions.