Cyclodextrin inclusion complexes as novel MOCVD precursors for potential cobalt oxide deposition

Abstract

The potential use of the inclusion complexes of β-cyclodextrins with metal halides as novel precursors in MOCVD applications was examined in terms of microstructure, thermal stability and chemical modifications during heating. The investigation was especially focused on the inclusion complex of β-cyclodextrin with cobalt iodide for cobalt oxide thin film deposition. The general composition assigned to the dextrin's inclusion complex was: (β-CD) 2 • CoI 7• 11H 2 O. It was found that the inclusion complex of β-cyclodextrin with CoI 2 may prove a promising alternative to traditional metalorganic or organometallic Coprecursors for precise CVD applications. The sublimation temperature must be preferably in the range 70-125• C, and the decomposition temperature (substrate temperature) in the range of 350-400• C. Three distinct regions can be recognized by heating: transformation of tightly bound water molecules into easily movable ones, sublimation of iodine ions and Co atoms oscillation and thermal decomposition of the glycositic ring into volatile by-products.

β-Cyclodextrin Inclusion Complexes of Budesonide with Enhanced Bioavailability for COPD Treatment

“…The increasing ratio of EtOH proportionally affects the crystallinity of the CD-BUD samples while the ability for the successful formation of inclusion complexes decreases. This is according to the literature since the molecules of the organic solvent compete with the active compound's molecules for inclusion in the interior cavity of CD [15]. However, concerning the H 2 O/EtOH 90/10 ratio, the crystallinity of the sample is increasing again, attributed to the highly hydrophobic nature of BUD.…”

“…Attributed to their structure, CDs are able to host lipophilic, non-polar molecules in their inner cavity by forming inclusion complexes [13,14]. The thermodynamic equilibrium between the different components of the system (CD, guest molecule, solvent) [15] affects drastically the successful formation of inclusion complexes. The formulated inclusion complexes are stable in aqueous environments owed to CD's hydrophilic external surface, and consequently, CDs are widely used in pharmaceuticals, drug delivery systems, cosmetics, and the food and chemical industries [12].…”

Investigation of the Effect of the Substrate Position Relative to the Source on the Optoelectrical and Structural Properties of Pure Nanostructured Tin Oxide by APCVD

“…In spite of the fact that the thickest layer is the sample grown at substrate angle of 60°, its mobility is the lowest, so it is rational to think that the uniformity of this sample is not as good as the samples with substrate angle of 90° and the sample grown on the floor of the reactor. Although we could not find similar articles in which the authors modify the position of the substrate in order to compare our results, there are many studies to confirm our acceptable electrical properties …”

Green synthesis of cobalt and iron incorporated citric acid/β‐cyclodextrin composites: Efficient H2O2 scavengers

“…[25,26] Interactions of other metal ions with unmodified cyclodextrins have been studied to a lesser extent. [27][28][29][30] On the other hand, from a solution of Fe salt in water at pH = 12, a precipitate of Fe (OH) 3 is formed and the deprotonated β-CD does not interact with Fe (III) ions. Therefore, a proper concentration of NaOH is essential to the formation of Fe/β-CD.…”