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Valence Bond Theory

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...

Spin–Spin Coupling: One-Bond Coupling

Spin–Spin Coupling: One-Bond Coupling

Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...

Colors and Magnetism

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...

Spin–Spin Coupling Constant: Overview

Spin–Spin Coupling Constant: Overview

In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must have a...

Crystal Field Theory - Octahedral Complexes

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...

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Related Experiment Video

Updated: Jun 20, 2026

Nanosponge Tunability in Size and Crosslinking Density

Nanosponge Tunability in Size and Crosslinking Density

Published on: August 4, 2017

Guest tunable structure and spin crossover properties in a nanoporous coordination framework material.

Suzanne M Neville¹, Gregory J Halder, Karena W Chapman

¹School of Chemistry, University of Sydney, NSW 2006, Australia.

Journal of the American Chemical Society

|August 27, 2009

Summary

The spin crossover framework SCOF-2

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Fabrication of Spatially Confined Complex Oxides

Fabrication of Spatially Confined Complex Oxides

Published on: July 1, 2013

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Last Updated: Jun 20, 2026

Nanosponge Tunability in Size and Crosslinking Density

Nanosponge Tunability in Size and Crosslinking Density

Published on: August 4, 2017

Fabrication of Spatially Confined Complex Oxides

Fabrication of Spatially Confined Complex Oxides

Published on: July 1, 2013

Area of Science:

Materials Science
Chemistry

Background:

Nanoporous materials offer tunable properties.
Spin crossover (SCO) materials exhibit switching behavior.

Purpose of the Study:

To investigate the impact of guest molecules on the spin crossover properties of SCOF-2.
To understand host-guest interactions in nanoporous frameworks.

Main Methods:

Sorption of various molecular guests (acetone, ethanol, methanol, propanol, acetonitrile) into SCOF-2.
Analysis of spin crossover properties, including transition abruptness, hysteresis, and transition temperature.

Main Results:

Guest sorption significantly alters SCOF-2's electronic switching properties.
Lattice cooperativity and hysteresis are influenced by guest-specific host-guest interactions.
Guest polarity affects transition temperature via electrostatic interactions.

Conclusions:

The spin crossover properties of SCOF-2 are rationally tunable through guest sorption.
Host-guest interactions play a crucial role in modulating SCO behavior.
SCOF-2 demonstrates potential for molecular-level control of electronic switching.