109th CEMS Colloquium


Dr. Shinji Inagaki (Principal Fellow, Toyota Central R&D Labs., Inc.)


17:30 - 18:30, February 22, 2023 (Wednesday)


Okochi-Hall, RIKEN


Synthesis of Periodic Mesoporous Organosilicas for Energy and Environmental Applications


Periodic mesoporous organosilicas (PMOs), synthesized via surfactant-directed self-assembly of bridged organosilane precursor [(R’O)3Si-R-Si(OR’)3, R: organic group] are promising candidates as catalyst supports, adsorbents, and optical and electrical devices due to the high surface area, well-defined nanoporous structure and highly functional framework structures [1-3]. Here I present the synthesis of PMOs with a variety of organic groups and their applications to heterogeneous molecular catalysis for solar energy conversion and sustainable organic synthesis, and to organic solar cells. We found unique light-harvesting antenna properties of PMOs [4] and constructed heterogeneous molecular photocatalysis systems for CO2 reduction [5]. We succeeded in synthesis of a novel PMO containing 2,2’-bipyridine ligands within the framework (BPy-PMO) [6]. BPy-PMO showed excellent solid ligand properties for heterogeneous metal complex catalysis, resulting in superior activity, durability, and recyclability to the homogeneous analogous catalysts [7]. We also synthesized hole-transporting PMO films and demonstrated that the PMO film functions as a p-type layer for organic solar cells by filling an n-type PCBM into the mesopores [8]. These results demonstrate the great potential of PMOs as a useful integration platform for construction of efficient molecular-based catalysts and optical devices.

[1] S. Inagaki, S. Guan, Y. Fukushima, T. Ohsuna, O. Terasaki, J. Am. Chem. Soc. 1999, 121, 9611
[2] S. Inagaki, S. Guan, T. Ohsuna, O. Terasaki, Nature 2002, 416, 304
[3] N. Mizoshita, T. Tani, S. Inagaki, Chem. Soc. Rev. 2011, 40, 789
[4] S. Inagaki, O. Ohtani, Y. Goto, K. Okamoto, M. Ikai, K. Yamanaka, T. Tani, T. Okada, Angew. Chem. Int. Ed. 2009, 48, 4042
[5] Y. Ueda, H. Takeda, T. Yui, K. Koike, Y. Goto, S. Inagaki, O. Ishitani, ChemSusChem, 2015, 8, 439
[6] M. Waki, Y. Maegawa, K. Hara, Y. Goto, S. Shirai, Y. Yamada, N. Mizoshita, T. Tani, W.-J. Chun, S. Muratsugu, M. Tada, A. Fukuoka, S. Inagaki: J. Am. Chem. Soc., 2014, 136, 4003
[7] S. Ishikawa, Y. Maegawa, M. Waki, S. Inagaki, ACS Catal. 2018, 8, 4160
[8] M. Ikai, Y. Maegawa, Y. Goto, T. Tani, S. Inagaki, J. Mater. Chem. A 2014, 2, 11857