Ferrihydrite Particle Encapsulated within a Molecular Organic Cage

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

3 Scopus Citations
View graph of relations

Author(s)

  • Masayuki Nihei
  • Hiromichi Ida
  • Takayuki Nibe
  • Adhitya Mangala Putra Moeljadi
  • Quang Thang Trinh
  • Manabu Ishizaki
  • Masato Kurihara
  • Takuya Shiga
  • Hiroki Oshio

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)17753-17759
Journal / PublicationJournal of the American Chemical Society
Volume140
Issue number50
Online published26 Nov 2018
Publication statusPublished - 19 Dec 2018

Abstract

Metal oxides with sizes of a few nanometers show variable crystal and electronic structures depending on their dimensions, and the synthesis of metal oxide particles with a desired size is a key technology in materials science. Although discrete metal oxide particles with an average diameter (d) smaller than 2 nm are expected to show size-specific properties, such ultrasmall metal oxide particles are significantly limited in number. In nature, on the other hand, nanosized ferrihydrite (Fh), which is ferric oxyhydroxide, occurs as a result of biomineralization in ferritin, an iron storage protein cage. Here we describe the synthesis of Fh particles using a covalent molecular organic cage (MOC) derived from 8 + 12 cyclocondensation of triaminocyclohexane with a diformylphenol derivative. At the initial reaction stage, eight iron ions accumulated at the metal binding sites in the cage cavity, and Fh particles (d = 1.9 ± 0.3 nm) encapsulated within the cage (Fh@MOC) formed with a quite narrow size distribution. The formation process of the Fh particle in the organic cage resembles the biomineralization process in the natural iron storage protein, and the present method could be applicable to the synthesis of other metal oxide particles. Fh@MOC is soluble in common organic solvents and shows substantial redox activity in MeCN.

Citation Format(s)

Ferrihydrite Particle Encapsulated within a Molecular Organic Cage. / Nihei, Masayuki; Ida, Hiromichi; Nibe, Takayuki; Moeljadi, Adhitya Mangala Putra; Trinh, Quang Thang; Hirao, Hajime; Ishizaki, Manabu; Kurihara, Masato; Shiga, Takuya; Oshio, Hiroki.

In: Journal of the American Chemical Society, Vol. 140, No. 50, 19.12.2018, p. 17753-17759.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review