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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...
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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Related Experiment Video

Updated: Jun 16, 2026

Crystallization and In Situ Room Temperature Data Collection Using the Crystallization Facility at Harwell and Beamline VMXi, Diamond Light Source
07:08

Crystallization and In Situ Room Temperature Data Collection Using the Crystallization Facility at Harwell and Beamline VMXi, Diamond Light Source

Published on: March 8, 2024

Single-crystal to single-crystal transformations in discrete hydrated dimeric copper complexes.

Shaikh M Mobin1, Ashwini K Srivastava, Pradeep Mathur

  • 1National Single Crystal X-ray Diffraction Facility and Department of Chemistry, IIT Bombay, Powai, Mumbai, India.

Dalton Transactions (Cambridge, England : 2003)
|January 28, 2010
PubMed
Summary
This summary is machine-generated.

Single crystals of hydrated copper complexes reversibly transform upon heating and rehydration. However, a bulkier ligand induces an irreversible conversion to a tetrameric copper cubane structure.

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Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Crystallography

Background:

  • Single-crystal to single-crystal (SCSC) transformations are crucial for designing responsive materials.
  • Hydrated copper complexes offer potential for dynamic structural changes.
  • Ligand properties significantly influence the stability and transformation pathways of metal complexes.

Purpose of the Study:

  • To investigate the thermal and hydration-induced SCSC transformations of discrete hydrated copper(II) complexes.
  • To explore the effect of ligand bulkiness on the structural transformation pathways.
  • To characterize the resulting dehydrated and irreversibly transformed copper complexes.

Main Methods:

  • Single-crystal X-ray diffraction was used to monitor structural changes.
  • Heating and exposure to water vapor were employed to induce transformations.
  • Spectroscopic and analytical techniques were used for characterization.

Main Results:

  • Two hydrated copper(II) complexes with acetate (OAc) and n-propionate (O(n)Pr) ligands underwent reversible SCSC dehydration/rehydration.
  • The lattice water molecules formed tetrameric clusters, which were regenerated upon rehydration.
  • A complex with bulkier n-propionate ligands irreversibly transformed into a unique tetrameric copper(II) complex with a double open cubane core.

Conclusions:

  • Reversible SCSC transformations are feasible in hydrated copper complexes, dependent on ligand choice.
  • Ligand bulkiness can dictate the transformation pathway, leading to irreversible structural reorganization.
  • The formation of a novel tetrameric copper(II) cubane structure highlights the potential for complex structural motifs in coordination chemistry.