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Ferrihydrite Particle Encapsulated within a Molecular Organic Cage
- Masayuki Nihei*Masayuki Nihei*E-mail for M.N.: [email protected]Faculty of Pure and Applied Sciences, Department of Chemistry, University of Tsukuba, Tennodai 1-1-1, Tsukuba 305-8571, JapanMore by Masayuki Nihei,
- Hiromichi IdaHiromichi IdaFaculty of Pure and Applied Sciences, Department of Chemistry, University of Tsukuba, Tennodai 1-1-1, Tsukuba 305-8571, JapanMore by Hiromichi Ida,
- Takayuki NibeTakayuki NibeFaculty of Pure and Applied Sciences, Department of Chemistry, University of Tsukuba, Tennodai 1-1-1, Tsukuba 305-8571, JapanMore by Takayuki Nibe,
- Adhitya Mangala Putra MoeljadiAdhitya Mangala Putra MoeljadiDepartment of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, People’s Republic of ChinaMore by Adhitya Mangala Putra Moeljadi,
- Quang Thang TrinhQuang Thang TrinhCambridge Centre for Advanced Research and Education in Singapore, Nanyang Technological University, 1 Create Way, Singapore 138602More by Quang Thang Trinh,
- Hajime HiraoHajime HiraoDepartment of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, People’s Republic of ChinaMore by Hajime Hirao,
- Manabu IshizakiManabu IshizakiDepartment of Material and Biological Chemistry, Faculty of Science, Yamagata University, 1-4-12 Kojirakawa-machi, Yamagata 990-8560, JapanMore by Manabu Ishizaki,
- Masato KuriharaMasato KuriharaDepartment of Material and Biological Chemistry, Faculty of Science, Yamagata University, 1-4-12 Kojirakawa-machi, Yamagata 990-8560, JapanMore by Masato Kurihara,
- Takuya ShigaTakuya ShigaFaculty of Pure and Applied Sciences, Department of Chemistry, University of Tsukuba, Tennodai 1-1-1, Tsukuba 305-8571, JapanMore by Takuya Shiga, and
- Hiroki OshioHiroki OshioFaculty of Pure and Applied Sciences, Department of Chemistry, University of Tsukuba, Tennodai 1-1-1, Tsukuba 305-8571, JapanMore by Hiroki Oshio
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 ([email protected]) 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. [email protected] is soluble in common organic solvents and shows substantial redox activity in MeCN.
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