A Novel Inorganic‐Organic Composite Constructed from Cobalt(II)‐Monosubstituted Polyoxometalates and Poly(amidoamine)‐NH₂ Dendrimers

Abstract

Abstract An inorganic‐organic composite was prepared by poly(amidoamine) (PAMAM) dendrimer reacting with cobalt(II)‐monosubstituted polyoxometalates Na 5 Co II (H 2 O)PW 11 O 39 (PW 11 Co) in an aqueous solution. The hybrid composite PW 11 Co/PAMAM was characterized by FT‐IR, UV‐Vis diffuse reflectance spectra (DR‐UV‐Vis), XPS, XRD and TG/DTA, indicating that the PW 11 Co was chemically anchored to PAMAM. The morphologies of the title composite were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The catalytic activity was evaluated by oxidation of isobutyraldehyde (IBA) to isobutyric acid (IBAc) in MeCN under mild conditions (20 °C, ambient pressure), showing that the title compound is a more effective and recoverable catalyst than corresponding PW 11 Co.