Size‑, Mass‑, and Density-Controlled Preparation of TiO<sub>2</sub> Nanoparticles in a Spherical Coordination Template

Abstract

TiO<sub>2</sub> nanoparticles were prepared with strict control of the size, molecular mass (PDI = 1.02), and mass density by hydrolyzing a precursor, Ti­(acac)<sub>2</sub>(biphen), in the presence of a well-defined hollow Pd<sub>12</sub>L<sub>24</sub> spherical endotemplate. The formation of highly monodisperse TiO<sub>2</sub> nanoparticles was confirmed by <sup>1</sup>H NMR spectroscopy, MALDI–TOF mass spectrometry, transmission electron microscopy, and atomic force microscopy. The template was easily removed by treating the sphere with a metal scavenger followed by calcination to give crystalline TiO<sub>2</sub> nanoparticles (2.0 ± 0.2 nm in diameter), which showed photocatalytic activity

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