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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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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...
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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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This lesson discusses the stability of substituted cyclohexanes with a focus on energies of various conformers and the effect of 1,3-diaxial interactions.
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Analytical techniques for characterization of cyclodextrin complexes in the solid state: A review.

Paola Mura1

  • 1Department of Chemistry, School of Human Health Sciences, University of Florence, Via Schiff 6, Sesto Fiorentino, I-50019 Florence, Italy.

Journal of Pharmaceutical and Biomedical Analysis
|March 7, 2015
PubMed
Summary

Cyclodextrins form complexes with hydrophobic molecules, enhancing properties. This review details analytical techniques for characterizing solid drug-cyclodextrin complexes, crucial for formulation development and patenting.

Keywords:
CyclodextrinInclusion complexSpectroscopic techniquesThermo-analytical techniquesX-ray diffraction

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Area of Science:

  • Pharmaceutical Sciences
  • Materials Science
  • Analytical Chemistry

Background:

  • Cyclodextrins (CDs) are cyclic oligosaccharides that form inclusion complexes with hydrophobic molecules, improving their physicochemical properties.
  • Characterizing these complexes is vital for selecting appropriate CDs, patenting, and marketing drug-CD formulations.
  • Complex formation in solution doesn't guarantee solid-state existence, and preparation methods significantly impact final product properties.

Purpose of the Study:

  • To provide a comprehensive overview of analytical techniques for characterizing solid-state drug-cyclodextrin (CD) systems.
  • To evaluate the advantages and limitations of each technique for assessing inclusion complex formation.
  • To guide the selection of optimal preparation methods for maximizing host-guest interactions in solid CD complexes.

Main Methods:

  • Review of principal analytical techniques applicable to solid-state drug-cyclodextrin systems.
  • Discussion of technique-specific advantages, limitations, and applications.
  • Inclusion of pertinent literature examples to illustrate technique utility.

Main Results:

  • Solid-state characterization requires a combination of analytical techniques, as no single method is sufficient.
  • Techniques like X-ray diffraction, spectroscopy (FTIR, NMR), and thermal analysis are essential for confirming inclusion complex formation.
  • The choice of preparation method (e.g., kneading, co-precipitation, spray-drying) influences the solid-state properties and the degree of complexation.

Conclusions:

  • Accurate characterization of solid drug-cyclodextrin systems is complex, necessitating the integrated use of multiple analytical methods.
  • Effective characterization aids in optimizing preparation techniques to achieve desired host-guest interactions and physicochemical properties.
  • This review serves as a guide for researchers and formulators in selecting appropriate analytical tools for drug-cyclodextrin complex analysis.