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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...
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Effect of Microwave Synthesis Conditions on the Structure of Nickel Hydroxide Nanosheets
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Published on: August 18, 2023

Aqua-bis(o-vanillinato-κO,O')nickel(II).

Qiang Wang1, Da-Qi Wang

  • 1College of Chemistry and Chemical Engineering, Liaocheng University, Shandong 252059, People's Republic of China.

Acta Crystallographica. Section E, Structure Reports Online
|January 5, 2011
PubMed
Summary
This summary is machine-generated.

This study details the structure of a nickel(II) complex with o-vanillinate ligands. The complex exhibits a distorted square-pyramidal geometry and forms dimers through hydrogen bonding in its crystal structure.

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Last Updated: Jun 5, 2026

Effect of Microwave Synthesis Conditions on the Structure of Nickel Hydroxide Nanosheets
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Gyroid Nickel Nanostructures from Diblock Copolymer Supramolecules
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Gyroid Nickel Nanostructures from Diblock Copolymer Supramolecules

Published on: April 28, 2014

Area of Science:

  • Inorganic Chemistry
  • Crystal Engineering
  • Coordination Chemistry

Background:

  • Nickel(II) complexes are widely studied for their diverse coordination geometries and applications.
  • o-Vanillinate ligands offer unique coordination possibilities due to their functional groups.

Purpose of the Study:

  • To synthesize and characterize a novel nickel(II) complex with o-vanillinate ligands.
  • To elucidate the coordination geometry and crystal structure of the resulting complex.

Main Methods:

  • Single-crystal X-ray diffraction was employed to determine the molecular and crystal structure.
  • Spectroscopic methods were used for characterization.

Main Results:

  • The nickel(II) atom is five-coordinated, adopting a distorted square-pyramidal geometry (τ = 0.06).
  • The complex crystallizes as dimers linked by intermolecular O-H⋯O hydrogen bonds.

Conclusions:

  • The study provides a detailed structural analysis of a nickel(II)-o-vanillinate complex.
  • The observed hydrogen bonding highlights the role of intermolecular interactions in crystal packing.