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Related Concept Videos

Crystal Field Theory - Octahedral Complexes02:58

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...
Valence Bond Theory02:42

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...
Electron Configurations02:46

Electron Configurations

Electron configurations and orbital diagrams can be determined by applying the Aufbau principle (each added electron occupies the subshell of lowest energy available), Pauli exclusion principle (no two electrons can have the same set of four quantum numbers), and Hund’s rule of maximum multiplicity (whenever possible, electrons retain unpaired spins in degenerate orbitals).
The relative energies of the subshells determine the order in which atomic orbitals are filled (1s, 2s, 2p, 3s, 3p, 4s,...
Stability of Conjugated Dienes01:28

Stability of Conjugated Dienes

Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
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,...
Crystal Density01:19

Crystal Density

The crystal lattice structure of a material allows us to determine how many molecules exist in its unit cell. With this information, alongside the unit-cell parameters - three distance parameters (a, b, c) and three angular parameters (α, β, γ).Density (ρ) = (Z × M) / (a × b × c × NA)where:Z is the number of formula units per unit cellM is the molar mass of the substancea, b, and c are the edge lengths of the unit cellNA is Avogadro’s numberFor a simple cubic lattice, atoms are located only at...

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Related Experiment Video

Updated: Jun 2, 2026

Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles
08:19

Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles

Published on: March 2, 2016

Structural transformations in CdSe nanoparticles: density functional theory approach.

G Misra1, M Goyal, S Tenguria

  • 1Department of Physics, Agra College, Dr. B. R. Ambedkar University, Agra 282004, India.

Journal of Biomedical Nanotechnology
|April 14, 2011
PubMed
Summary
This summary is machine-generated.

Structural changes in cadmium selenide (CdSe) nanoparticles impact human health and the environment. These nanoparticles undergo a wurtzite to rock salt transition, with implications for their use in biomedical applications.

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Last Updated: Jun 2, 2026

Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles
08:19

Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles

Published on: March 2, 2016

Seeded Synthesis of CdSe/CdS Rod and Tetrapod Nanocrystals
12:56

Seeded Synthesis of CdSe/CdS Rod and Tetrapod Nanocrystals

Published on: December 11, 2013

Compact Quantum Dots for Single-molecule Imaging
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Compact Quantum Dots for Single-molecule Imaging

Published on: October 9, 2012

Area of Science:

  • Materials Science
  • Nanotechnology
  • Environmental Science
  • Toxicology

Background:

  • Cadmium selenide (CdSe) nanoparticles are widely studied for their unique properties.
  • Structural transformations in nanomaterials can alter their behavior and impact.
  • Understanding these transformations is crucial for assessing environmental and health risks.

Purpose of the Study:

  • To investigate the multidimensional effects of structural transformations in CdSe nanoparticles.
  • To analyze the wurtzite to rock salt phase transition in CdSe nanoparticles.
  • To determine the influence of crystallite size on the transition's thermodynamics and kinetics.

Main Methods:

  • Computational modeling of phase transitions.
  • Analysis of crystallite size effects.
  • Assessment of environmental and health implications.

Main Results:

  • CdSe nanoparticles undergo a wurtzite to rock salt transition.
  • Nanoparticle crystallite size significantly affects the transition's thermodynamics and kinetics.
  • Structural modifications influence the nanoparticles' potential for biomedical applications.

Conclusions:

  • The structural transformation of CdSe nanoparticles has significant environmental and health considerations.
  • Crystallite size is a critical factor governing the phase transition in CdSe nanoparticles.
  • Modified CdSe nanoparticles show promise for future biomedical applications.