Research Highlights

CPL controlled photochirogenesis … It was a long journey since the time of Biot (1815).

iStock_000010776130XSmall.jpgLaibing Wang, Yin Lu, Wei Zhang, Xiulin Zhu, Michiya Fujiki
Circularly Polarized Light with Sense and Wavelengths to Regulate Azobenzene Supramolecular Chirality in Optofluidic Medium
Journal of the American Chemical Society (ACS), 139, 13218-13226 (2017).LinkIconMore View

Anti-Kasha’ rule in chiral luminophores

iStock_000010776130XSmall.jpgSang Thi Duong, Michiya Fujiki
The origin of bisignate circularly polarized luminescence (CPL) spectra from chiral polymer aggregates
and molecular camphor: Anti-Kasha’s rule revealed by CPL excitation (CPLE) spectra
Polymer Chemistry (RSC), 8, 4673-4679 (2017).LinkIconMore View

Tempo-spatial chirogenesis. Limonene-induced mirror symmetry breaking of polysilane aggregates

iStock_000010776130XSmall.jpgMichiya Fujiki, Keisuke Yoshida, Nozomu Suzuki, Nor Azura Abdul Rahim, and Jalilah Abd Jalil
Tempo-spatial chirogenesis. Limonene-induced mirror symmetry breaking of Si–Si bond polymers
during aggregation in chiral fluidic media
Journal of Photochemistry and Photobiology A: Chemistry (Elsevier), 331, 120−129 (2016).
LinkIconMore View

Cryptochirality: Mirror symmetry breaking in the photoexcited state, though mirror symmetry in the ground state

iStock_000010776130XSmall.jpgTomoyuki Amako, Kazuki Nakabayashi, Nozomu Suzuki, Sibo Guo, Nor Azura Abdul Rahim, Takunori Harada, Michiya Fujiki, Yoshitane Imai
Pyrene Magic: Chiroptical Enciphering and Deciphering 1,3-Dioxolane Bearing Two Wirepullings to Drive Two Remote Pyrenes
Chemical Communications , 51, 8237−8240 (2015).LinkIconMore View

Mass-less spinning UV-vis photon swaps hand of polymers

iStock_000010776130XSmall.jpgMichiya Fujiki, Yuri Donguri, Yin Zhao, Ayako Nakao, Nozomu Suzuki, Kana Yoshida, Wei Zhang
Photon Magic: Chiroptical Polarisation, Depolarisation, Inversion, Retention and Switching of Non-photochromic Light-emitting Polymer in Optofluidic Medium
Polymer Chemistry, 6, 1627-1638 (2015).LinkIconMore View

Mirror-symmetry-breaking of pi-conjugated polymer particles

iStock_000010776130XSmall.jpgMichiya Fujiki, Yoshifumi Kawagoe, Yoko Nakano, Ayako Nakao
Mirror-Symmetry-Breaking in Poly[(9,9-di-n-octylfluorenyl- 2,7-diyl)-alt-biphenyl] (PF8P2) is Susceptible to Terpene Chirality, Achiral Solvents, and Mechanical Stirring
Molecules, 18, 7035−7057 (2013).

Mirror-symmetry-breaking and mirror-symmetry-restoration of pi-conjugated polymer particles

iStock_000010776130XSmall.jpgMichiya Fujiki, Kana Yoshida, Nozomu Suzuki, Jian Zhang, Wei Zhang, Xiulin Zhu
Mirror Symmetry Breaking and Restoration within μm-Sized Polymer Particles in Optofluidic Media
by Pumping Circularly Polarised Light
RSC Advances,
3, 5213−5219 (2013).

Mirror-symmetry-breaking of pi-conjugated polymer particles

iStock_000010776130XSmall.jpgMichiya Fujiki, Abd Jalil Jalilah, Nozomu Suzuki, Makoto Taguchi, Wei Zhang, Mohamed Mehawed Abdellatif, Kotohiro Nomura
Chiral optofluidics: Gigantic circularly polarized light enhancement of all-trans-poly(9,9-di-n-octylfluorene-2,7-vinylene) during mirror-symmetry-breaking aggregation by optically tuning fluidic media
RSC Advances, 2, 6663-6671 (2012).

Mirror-symmetry-breaking of sigma-conjugated polymer particles

iStock_000010776130XSmall.jpgYoko Nakano, Fumiko Ichiyanagi, Masanobu Naito, Yonggang Yang, Michiya Fujiki,
Chiroptical generation and inversion during the mirror-symmetry-breaking aggregation of dialkylpolysilanes due to limonene chirality
Chemical Communications, 48, 6636-6638 (2012).

Switching spinning light in thermo-responsive polymer hydrogel by mechanical stirring direction

karakusa.jpgKunihiko Okano, Makoto Taguchi, Michiya Fujiki, Takashi Yamashita,
Circularly Polarized Luminescence of Rhodamine B in a Supramolecular Chiral Medium Formed by a Vortex Flow
Angewandte Chemie International Edition, 50, 12474−12477 (2011) (Frontisepiece)LinkIconMore

Received award of the honory Professor from Soochow University (2011.10.20)

President Xiulin Zhu and I
Lecture title:Learning from Nature's Force : Programmed Design of Phthalocyanine Supramolecular Polymers

Learning from nature's solar energy conversion: Generation of giant circularly polarized light enhancement

Yoko Nakano, Michiya Fujiki
Circularly Polarized Light Enhancement by Helical Polysilane Aggregates Suspension in Organic Optofluids
Macromolecules, 44, 7511−7519 (2011).

Unpolarized-light-driven optically active switching azobenzene-containing polymers

DSCN1434.JPGZhang, W.; Yoshida, K.; Fujiki, M.; Zhu, X.
Unpolarized-Light-Driven Amplified Chiroptical Modulation Between Chiral Aggregation and Achiral Disaggregation of an Azobenzene-alt-Fluorene Copolymer in Limonene
Macromolecules, 44, 5105–5111(2011).

Chiroptical nano fibers made of achiral phthalocyanines and diamine homochirality

Clown Fish.jpgZhang, W., Fujiki, M., Zhu, X.
Chiroptical nanofibers generated from achiral metallophthalocyanines induced by diamine homochirality
Chemistry - A European Journal, 17, 10628–10635 (2011).

Pls see the previous related works.
・Tabei, H., Fujiki, M., Imamura, S., Direct Pattern Fabrication of Substituted Phthalocyanine Films, Jpn. J. Appl. Phys., Part 2: Letters, 24, 685 (1985).
・Fujiki, M., Tabei, H., Isa, K., New tetrapyrrolic macrocycle:α,β,γ-triazatetrabenzcorrole, J. Am. Chem. Soc., 108, 1532 (1986).
・Fujiki, M., Tabei, H., Imamura, S., Direct patterning and electrical properties of Pc thin films prepared by Langmuir-Blodgett and spin cast techniques, Jpn. J. Appl. Phys., Part 1: 26, 1224 (1987).
・Fujiki, M., Tabei, H., Kurihara, T. Self-assembling features of soluble nickel phthalocyanines, J. Phys. Chem., 92, 1281 (1988).
・Fujiki, M., Tabei, H., Kurihara, T., In-plane dichroisms of phthalocyanine Langmuir-Blodgett films, Langmuir, 4, 1123 (1988).
・Fujiki, M., Tabei, H., Preparation and electrical properties of lightly substituted phthalocyanine Langmuir-Blodgett films, Langmuir, 4, 320 (1988).
・Rai, R., Saxena, A., Ohira, A., Fujiki, M., Programmed hyperhelical supramolecular assembly of nickel phthalocyanine bearing enantiopure 1-(p-tolyl)ethylaminocarbonyl groups, Langmuir, 21, 3957 (2005).
・Ishikawa, M., Fujiki, M., Naito, M., Highly organized phthalocyanine assembly onto gold surface through spontaneous polymerization, Chem. Lett., 36, 304 (2007).
・Zhang, W., Ishimaru, A., Onouchi, H., Rai, R., Saxena, A., Ohira, A., Ishikawa, M., Naito, M., Fujiki, M., Ambidextrous Optically active copper(II) phthalocyanine supramolecules induced by peripheral group homochirality, New J. Chem., 34, 2310 (2010).
・Zhang, W., Ochi, K., Fujiki, M., Naito, M., Ishikawa, M. Kaneto, K., Takashima, W., Saeki, A., Seki, S. Programmed high–hole–mobility supramolecular polymers from disk-shaped molecules, Adv. Funct. Mater., 20, 3941 (2010).

Piezochromic fluorescence in liquid crystalline conjugated polymers

W.-E. Lee, C.-L. Lee, T. Sakaguchi, M. Fujiki, M. & G. Kwak,* Piezochromic fluorescence in liquid crystalline conjugated polymers.,
Chem. Commun. 47, 3526–3528 (2011).LinkIconMore
Pls see the previous related works.
1. W.-E. Lee, J.-W. Kim, C.-J. Oh, T. Sakaguchi, M. Fujiki and G. Kwak,* Angew. Chem., Int. Ed., 49, 1406–1409 (2010).
2. G. Kwak,* M. Minaguchi, T. Sakaguchi, T. Masuda and M. Fujiki, Macromolecules, 41, 2743–2746 (2008).
3. G. Kwak,* M. Minaguchi, T. Sakaguchi, T. Masuda and M. Fujiki, Chem. Mater., 19, 3654–3661(2007).
4. G. Kwak,* M. Fujiki,* T. Sakaguchi, and T. Masuda, Macromolecules, 39, 319–323 (2006).

Green-and-red photoluminescence from Si–Si and Ge–Ge bond network polymers

DSCN1188.JPGGreen-and-Red Photoluminescence from Si–Si and Ge–Ge Bonded Network Homopolymers and Copolymers,
Fujiki, M., Kato, M., Kawamoto, Y., Kwak, G. Polymer Chemistry, 2011, 2, 914–922.
Pls see the previous related works.
1. Fujiki, M., Kawamoto, Y., Kato, M., Fujimoto,Y., Saito, T., Hososhima, S., Kwak, G. Chem. Mater., 21, 2459-2466 (2009).
2. Furukawa, K., Fujino, M., Matsumoto, N., Macromolecules, 23, 3423-3426 (1990).
3. Kishida, H., Tachibana, H., Matsumoto N., Tokura, Y. Appl. Phys. Lett., 65, 1358–1360 (1994).
4. Fujiki, M. and Kwak, G. Amorphous and Crystalline Silicon Films from Soluble Si-Si Network Polymers, In Crystalline Silicon (InTech: ISBN 978-953-307-354-5) OpenAccess.

Facile recognition/extraction of single-walled carbon nanotubes with specific chirality

A Rational Concept to Recognize/extract Single-walled Carbon Nanotubes with a Specific Chirality
Ozawa, H., Fujigaya, T., Niidome, Y., Hotta, N., Fujiki, M., Nakashima, N.
Journal of the American Chemical Society, 133, 2651-2657 (2011). (IF = 8.58)

Anomalous thermotropic liquid crystalline phase behaviour in polysilane with narrow molecular weight distributions

DSCN1938.JPGOkoshi, K., Hagihara, T., Fujiki, M., Watanabe, J.
Anomalous thermotropic liquid crystalline phase behaviour in poly[n-decyl-(RS)-2-methylbutylsilane]s with narrow molecular weight distributions, Liquid Crystals, 37, 1183-1190 (2010).
Pls see the previous related works.
1. Okoshi, K.; Kamee, H.; Suzaki, G.; Tokita, M.; Fujiki, M.; Watanabe, J. Macromolecules 2002, 35, 4556–4559.
2. Okoshi, K.; Saxena, A.; Fujiki, M.; Suzaki, G.; Watanabe, J.; Tokita, M. Mol. Cryst. Liq. Cryst. 2004, 419, 57–68.
3. Okoshi,K.; Saxena,A.; Naito, M.; Suzaki, G.; Tokita, M.; Watanabe, J.; Fujiki,M. Liq. Cryst. 2004, 31, 279–283.
4. Okoshi, K.; Suzuki, A.; Tokita, M.; Fujiki, M.; Watanabe, J. Macromolecules 2009, 42, 3443–3447.
5. Okoshi, K.; Suzuki, G.; Kamee, H.; Tokita, M.; Magoshi, J.; Watanabe, J. Jpn. J. Appl. Phys. 2002, 41, L720–L722.
6. Oka, H.; Suzaki, G.; Edo, S.; Suzuki, A.; Tokita, M.; Watanabe, J. Macromolecules 2008, 41, 7783–7786.
7. Watanabe, J., Kamee, H., Fujiki, M., Polym. J. 2001, 33, 495-497.

Mirror-symmetry-breaking in helical polysilanes: preference between left and right of chemical and physical origin

polySi.jpgFujiki, M., Mirror Symmetry Breaking in Helical Polysilanes: Preference between Left and Right of Chemical and Physical Origin, Symmetry, 2, 1625-1652 (2010) OpenAccess
From elemental particles to human beings, matter is dissymmetric with respect to mirror symmetry. In 1860, Pasteur conjectured that biomolecular handedness— homochirality—may originate from certain inherent dissymmetric forces existing in the universe. The present paper reports comprehensively an inequality between six pairs of helical polysilane high polymers, presumably, detectable by (chir)optical and achiral Si-/C-NMR spectra, and viscometric measurements.

Programmed high–hole–mobility supramolecular phthalocyanines

DSCN1936.JPGZhang, W., Ochi, K., Fujiki, M., Naito, M., Ishikawa, M. Kaneto, K., Takashima, W., Saeki, A., Seki, S.
Programmed High–hole–mobility Supramolecular Polymers from Disk-shaped Molecules,
Advanced Functional Materials, 20, 3941-3947 (2010). (IF=6.99)

Limonene magic: noncovalent molecular chirality transfer leading to circularly polarised luminescent π-conjugated polymers

chemist-room8X6.jpgLimonene magic: noncovalent molecular chirality transfer leading to ambidextrous circularly polarised luminescent π-conjugated polymers, Kawagoe, Y., Fujiki, M., Nakano, Y. New Journal of Chemistry, 34, 637-647 (2010).

Ambidextrous optically active phthalocyanine supra molecules by peripheral group homochirality

DSCN1315_1.jpgAmbidextrous Optically Active Copper(II) Phthalocyanine Supramolecules Induced by Peripheral Group Homochirality,
Zhang, W., Ishimaru, A., Onouchi, H., Rai, R., Saxena, A., Ohira, A., Ishikawa, M., Naito, M., Fujiki, M.
New Journal of Chemistry, 34, 2310−2318 (2010).

Circular dichroism and circularly polarised luminescence from polyfluorene by terpene chirality transfer

DSC00206.JPGAmbidextrous Circular Dichroism and Circularly Polarised Luminescence from Poly(9,9-di-n-decylfluorene) by Terpene Chirality Transfer, Yoko Nakano, Yang Liu and Michiya Fujiki, Polymer Chemistry, 1, 460–469 (2010).LinkIconMore

Mirror-symmetry-breaking of Si-Si bond polymers: From weak bosons to artificial helix

weakbosons.jpgMirror Symmetry Breaking of Silicon Polymers – From Weak Bosons to Artificial Helix,
Fujiki, M., The Chemical Record, 9, 271-298 (2009).LinkIconMore

From elemental particles to human beings, matter and living worlds in our universe are dissymmetric with respect to mirror symmetry. Since the early 19th century, the origin of biomolecular handedness has been puzzling scientists. Nature's elegant bottom-up preference, however, sheds light on new concepts of generating, amplifying, and switching artificial polymers, supramolecules, liquid crystals, and organic crystals that can exhibit ambidextrous circular dichroism in the UV/Visible region with efficiency in production under milder ambient conditions. In the 1920s, Kipping, who first synthesized polysilanes with phenyl groups, had much interest in the handedness of inorganic and organic substances from 1898 to 1909 in his early research life. Polysilanes—which are soluble Si-Si bonded chain-like near-UV chromophores that carry a rich variety of organic groups—may become a bridge between animate and inanimate polymer systems. The present account focuses on several mirror symmetry breaking phenomena exemplified in polysilanes carrying chiral and/or achiral side groups, which are in isotropic dilute solution, as polymer particles dispersed in solution, and in a double layer film immobilized at the solid surface, and subtle differences in the helix, by dictating ultimately ultraweak chiral forces at subatomic, atomic, and molecular levels.

Book. Advanced nanomaterials (K. E. Geckeler, H. Nishide, eds) (Wiley-VCH)

ISBN: 978-3-527-31794-3
Chapter 5; Helical Polymer-Based Supramolecular Films
Akihiro Ohira, Michiya Fujiki, and Masashi Kunitake
Nature’s elegant bottom-up fabrication of hierarchical superhelical assemblies over a wide range of scales has inspired the development of functional advanced materials from efficient approaches. In natural systems, hierarchical helical architectures, such as the double helix of DNA, the triple helix of collagen, and the α-helical coiled-coils of myosin and keratin on the molecular level, are ubiquitous. ... More

Full-visible-spectrum emitters: Pyrolysis of soluble Si-Si bond network polymers

DSCN1573_2.JPGMichiya Fujiki, Yoshiki Kawamoto, Masahiko Kato,Yuji Fujimoto,Tomoki Saito, Shin-ichi Hososhima, and Giseop Kwak,
Full-Visible-Spectrum Emitters from Pyrolysis of Soluble Si-Si Bonded Network Polymers,
Chemistry of Materials, 21, 2459–2466 (2009). LinkIconMore

Circularly polarized luminescence and circular dichroism from Si–Si-bond network polymers

Fukao, S., Fujiki, M. Circularly Polarized Luminescence and Circular Dichroism from Si–Si-Bonded Network Polymers,
Macromolecules, 42, 8062–8067 (2009).

Non-classical forces: Seemingly insignificant to control macromolecular dtructures

Dew Drop.jpgA Non-classical Forces: Seemingly Insignificant But a Powerful Tool to Control Macromolecular Structures, Fujiki, M. and Saxena, J. Polym. Sci. Part A: Polym. Chem., 46, 4637-4650 (2008).LinkIconMore

Amplification of chirality (Springer : ISBN: 3540778683

Amplification of Chirality (Springer : ISBN: 3540778683, 2008/07/09
Helix Generation, Amplification, Switching, and Memory of Chromophoric Polymers LinkIconMore

Polysilane organogel with hierarchical structures by weak intra-/inter-chain CF/Sind van der Waals forces

DSCN1833.JPGTakuma Kawabe, Masanobu Naito, Michiya Fujiki
Polysilane Organogel with Hierarchical Structures Formed by Weak Intra-/Inter-chain Si/FC and van der Waals Interactions,
Poymer Journal, 40, 317-326 (2008).LinkIconMore

11th Reed lecture award

060425_CReedaward_fujiki.jpgRensselaer Polytechnic Institute (Troy, NewYork), Department of Chemistry and Chemical Biology, 11th Reed Lecture Award
Silicon magic: The state-of-the-art: Helical polysilanes directed nanoscience and nanotechnologyLinkIconMore