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Valence Bond Theory

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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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Related Experiment Video

Updated: May 14, 2026

Light-driven Molecular Motors on Surfaces for Single Molecular Imaging

Light-driven Molecular Motors on Surfaces for Single Molecular Imaging

Published on: March 13, 2019

Organic single molecular structures for light induced spin-pump devices.

Burkhard O Jahn¹, Henrik Ottosson, Michael Galperin

¹Department of Chemistry, BMC, Box 576, Uppsala University, 75123 Uppsala, Sweden.

|January 29, 2013

Summary

Researchers designed novel molecular spin-pumps using electron spin resonance. These stable triplet biradicals show potential for efficient spin pumping with magnetic and light fields.

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Area of Science:

Molecular physics
Quantum chemistry
Materials science

Background:

Electron spin resonance (ESR) is a key technique for probing systems with unpaired electrons.
Molecular spin-pumps are devices that control the flow of electron spins.

Purpose of the Study:

To theoretically design stable molecular structures for efficient spin-pump applications.
To identify molecular candidates that operate under ambient conditions.

Main Methods:

Utilizing density functional theory (DFT) for molecular structure design.
Investigating triplet biradicals with spatially and energetically separated singly occupied molecular orbitals (SOMOs).

Main Results:

Identified stable triplet biradicals as promising candidates for molecular spin-pumps.
Proposed molecular structures are expected to be persistent at ambient conditions.

Conclusions:

The designed molecular structures are theoretically suitable for spin-pump applications.
Operation is predicted using MHz magnetic fields and infrared to visible light.