Synthesis and characterization of two new photochromic inorganic-organic hybrid materials based on Keggin-type polyoxometalates

Abstract

Two new photochromic inorganic-organic hybrid materials formed from Keggin-type polyoxometalates(POMs) and metronidazole (C 6 H 9 N 3 O 3 , MNZ), formulated as H 3 PMo 12 O 40 •3MNZ·3H 2 O (1) and H 3 PW 12 O 40 •3MNZ·3H 2 O(2), were synthesized and characterized by elemental analysis, IR spectra, electronic spectra, electron spin resonance (ESR) spectra and thermogravi-metry-differential thermal analysis (TG-DTA). Refl ectance spectra show the presence of weak intermolecular charge transfer between the organic and inorganic moieties in the solid state. The photochromic properties were studied by solid diffuse refl ectance spectra and ESR spectra, and the photochromic reactions were found to exhibit fi rst-order kinetics. TG-DTA showed that two hybrid materials have similar thermal behavior.

Controlled drug delivery and cell adhesion for bone tissue regeneration by Keplerate polyoxometalate (Mo132)/metronidazole/PMMA scaffolds

“…However, although PMMA is hydrophobic and MTN and Mo 132 are hydrophilic, they can form strong hydrogen bonds. Moreover, Mo 132 can form ionic bonds with MTN molecules 58 . The higher contents of Mo 132 in nanofibers show a lower MTN release.…”