Published Papers


  • 59.“TBA”
    S. Thazhathethil, F. S. Thuluvanchery, I. Scarlat, J. M. Clough, C. Weder, Y. Sagara*
  • 58.“TBA”
    Q. Liu, T. Zhang, Y. Ikemoto, Y. Shinozaki, G. Watanabe, Y. Hori, Y. Shigeta, T. Midorikawa, K. Harano, Y. Sagara*
  • 57.“A Rotaxane-based Supramolecular Mechanophore Featuring a Pyridine Group in the Luminophore”
    R. Mori, Y. Sagara*
    Chem. Lett., in press.

  • 56.“Enhanced Photothermal Property of NDI-Based Conjugated Polymers by Copolymerization with Thiadiazolobenzotriazole Unit”
    M. Wang, C.-Y. Lin, Y. Sagara, T. Michinobu*
    ACS Materials Au, 2024, 1, 82–91.



  • 50.“Excited State Charge-Transfer Complexes Enable Fluorescence Color Changes in a Supramolecular Cyclophane Mechanophore”
    S. Thazhathethil, T. Muramatsu, N. Tamaoki, C. Weder,* Y. Sagara*
    Angew. Chem. Int. Ed. 2022, 61, e202209225. (Open Access)(Hot Paper, Back Cover)

  • 49.“Crystal Structure of a 4,7-Bis(phenylethynyl)-2,1,3-benzothiadiazole-based Cyclophane and the Mechanoresponsive Luminescence”
    K. Hiratsuka, F. S. Thuluvanchery, K. Takahashi,* T. Nakamura, Y. Sagara*
    Bull. Chem. Soc. Jpn. 2022, 95, 1474–1480. (Selected Paper, Inside Cover)

  • 48.“Supramolecular Rings as Building Blocks for Stimuli-Responsive Materials”
    H. Traeger, A. Ghielmetti, Y. Sagara, S. Schrettl,* C. Weder*
    Gels 2022, 8, 350.
  • 47.“Strain-correlated mechanochromism in different polyurethanes featuring a supramolecular mechanophore”
    H. Traeger, Y. Sagara, J. A. Berrocal, S. Schrettl,* C. Weder*
    Polym. Chem. 2022, 13, 2860–2869.


  • 46.“Crystal structure of a 1,6-bis(phenylethynyl)pyrene-based cyclophane that exhibits mechanochromic luminescence”
    S. Shimizu, S. Thazhathethil, K. Takahashi,* T. Nakamura, Y. Sagara*
    Mol. Syst. Des. Eng. 2021, 6, 1039–1046. (Invited)

  • 45.“Rotaxane-Based Dual Function Mechanophores Exhibiting Reversible and Irreversible Responses”
    T. Muramatsu, Y. Okado, H. Traeger, S. Schrettl, N. Tamaoki, C. Weder,* Y. Sagara*
    J. Am. Chem. Soc. 2021, 143, 9884–9892.
  • 44.“Folded Perylene Diimide Loops as Mechanoresponsive Motifs”
    H. Traeger, Y. Sagara, D. J. Kiebala, S. Schrettl, C. Weder*
    Angew. Chem. Int. Ed. 2021, 60, 16191–16199.
  • 43.“Mechanically Responsive Luminescent Polymers Based on Supramolecular Cyclophane
    Y. Sagara,* H. Traeger, J. Li, Y. Okado, S. Schrettl, N. Tamaoki, C. Weder*
    J. Am. Chem. Soc. 2021, 143, 5519–5525.
  • 42.“Two-step mechanoresponsive luminescence and mechanical stimuli-induced release of small molecules exhibited by a luminescent cyclophane”
    Y. Sagara,* K. Takahashi, A. Seki, T. Muramatsu, T. Nakamura, N. Tamaoki
    J. Mater. Chem. C 2021, 9, 1671–1677.


  • 41.“Mechanical and Thermal Stimuli-induced Release of Toluene Included in Luminescent Crystals as One-dimensional Solvent Channels”
    Y. Sagara,* K. Takahashi, T. Nakamura, N. Tamaoki
    J. Mater. Chem. C 2020, 8, 10039–10046.
  • 40.“Mechanochromic Luminescence from Crystals Consisting of Molecular Sheets Constructed by Intermolecular Hydrogen Bonds”
    Y. Sagara,* K. Takahashi, T. Nakamura, N.Tamaoki
    Chem. Asian J. 2020, 15, 478–482. (Invited)
    (Special Issue: “100th Annual Meeting of the Chemical Society of Japan”)
  • 39.“Crystal structure and thermoresponsive luminescence of a 9,10-bis(phenylethynyl)anthracene-based cyclophane”
    Y. Sagara,* K. Takahashi, T. Nakamura, N. Tamaoki
    Mol. Syst. Des. Eng. 2020, 5, 205–211. (Invited)
    (Special Issue: “MSDE Emerging Investigators 2020”)


  • 38.“Mechanoresponsive Behavior of a Polymer-Embedded Red-Light Emitting Rotaxane Mechanophore”
    T. Muramatsu, Y. Sagara,* H. Traeger, N. Tamaoki, C. Weder*
    ACS Appl. Mater. Interfaces 2019, 11, 24571–24576.
  • 37.“Rotaxane-based Mechanophores Enable Polymers with Mechanically Switchable White
    Y. Sagara,* M. Karman, A. Seki, M. Pannipara, N. Tamaoki, C. Weder*
    ACS Cent. Sci. 2019, 5, 874–881.
  • 36.“Photoinduced Emission Color Change of a Rubbed Film of a Bis(cyanostyryl)benzene Analogue”
    R. Kaneko, Y. Sagara, S. Katao, N. Tamaoki, C. Weder, and H. Nakano*
    Chem. Eur. J. 2019, 25, 6162–6169.
  • 35.“Temperature Controlled Locally Excited and Twisted Intramolecular Charge Transfer State Dependent Fluorescence Switching in Triphenylamine-Thiazole Derivatives”
    A. Kundu, S. Karthikeyan, Y. Sagara, D. Moon,* S. P. Anthony*
    ACS Omega 2019, 4, 5147–5154.
  • 34.“Functional Polymers Through Mechanochemistry”
    S. Schrettla,* D. W. R. Balkenende, C. Calvino, M. Karman, A. Lavrenova, L. Neumann, Y. Sagara, E. Verde-Sesto, M. D. Giannantonio, K. M. Fromm, M. Lattuada, C. Weder*
    Chimia 2019, 73, 7–11.
  • 33.“A 1,6-Diphenylpyrene-based, Photoluminescent Cyclophane Showing a Nematic Liquid-crystalline Phase at Room Temperature”
    Y. Sagara,* T. Muramatsu, N. Tamaoki
    Crystals 2019, 9, 92. (Invited)
    (Special Issue: Synthesis and Properties of Light-emitting Liquid Crystals)
  • 32.“Mechanoresponsive Luminescent Polymer Blends Based on an Excimer-Forming Telechelic Macromolecule”
    C. Calvino, Y. Sagara, V. Buclin, A. P. Haehnel, A. del Prado, C. Aeby, Y. C. Simon, S. Schrettl, C. Weder*
    Macromol. Rapid Commun. 2019, 40, 1800705.


  • 31.“Cyclophane-Based Fluorescence Tuning Induced by Hydrostatic Pressure Changes”
    Y. Sagara,* N. Tamaoki, G. Fukuhara*
    ChemPhotoChem 2018, 2, 959–963.
  • 30.“Unusual Fluorescent Photoswitching of Imidazole Derivatives: Role of Molecular Conformation and Twist Angle Controlled Organic Solid State Fluorescence”
    A. Kundu, S. Karthiheyan, Y. Sagara, D. Moon, S. P. Anthony*
    Phys. Chem. Chem. Phys. 2018, 20, 27385–27393.
  • 29.“Linearly Polarized Photoluminescence from an Asymmetric Cyclophane Showing Thermo- and Mechanoresponsive Luminescence”
    Y. Sagara,* A. Seki, Y. Kim, N. Tamaoki*
    J. Mater. Chem. C 2018, 6, 8453–8459.
  • 28.“Drastic Modulation of Stimuli-Responsive Fluorescence by a Subtle Structural Change of Organic Fluorophore and Polymorphism Controlled Mechanofluorochromism”
    P. S. Hariharan, G. Parthasarathy, A. Kundu, S. Karthikeyan, Y. Sagara, D. Moon,* S. P. Anthony*
    Cryst. Growth Des. 2018, 18, 3971–3979.
  • 27.“Stimuli-Responsive Dual-Color Photon Upconversion: A Singlet-to-Triplet Absorption Sensitizer in a Soft Luminescent Cyclophane”
    K. Mase, Y. Sasaki, Y. Sagara,* N. Tamaoki, C. Weder, N. Yanai,* N. Kimizuka*
    Angew. Chem. Int. Ed. 2018, 57, 2806–2810.
  • 26.“Rotaxanes as Mechanochromic Fluorescent Force Transducers in Polymers”
    Y. Sagara,* M. Karman, E. Verde-Sesto, K. Matsuo, Y. Kim, N. Tamaoki, C. Weder*
    J. Am. Chem. Soc. 2018, 140, 1584–1587.


  • 25.“Mechanoresponsive Luminescence and Liquid-crystalline Behaviour of a Cyclophane Featuring Two 1,6-Bis(phenylethynyl)pyrene Groups”
    Y. Sagara,* N. Tamaoki*
    RSC Adv. 2017, 7, 47056–47062.
  • 24.“Asymmetric Cyclophanes Permit Access to Supercooled Nematic Liquid Crystals with Stimuli-responsive Luminescence”
    Y. Sagara,* C. Weder, N. Tamaoki*
    Chem. Mater. 2017, 29, 6145–6152.
  • 23.“Mechano- and Thermoresponsive Photoluminescent Supramolecular Polymer”
    A. Lavrenova, D. W. R. Balkenende, Y. Sagara, S. Schrettl, Y. C. Simon, C. Weder*
    J. Am. Chem. Soc. 2017, 139, 4302–4305.
  • 22.“Temperature-Dependent Mechanochromic Behavior of Mechanoresponsive Luminescent Compounds”,
    Y. Sagara,* K. Kubo, T. Nakamura, N. Tamaoki, C. Weder*
    Chem. Mater. 2017, 29, 1273–1278.


  • 21.“Tuning the Thermo- and Mechanoresponsive Behavior of Luminescent Cyclophanes”
    Y. Sagara,* C. Weder, N. Tamaoki*
    RSC Adv. 2016, 6, 80408–80414.
  • 20.“A Mechano- and Thermoresponsive Luminescent Cyclophane”
    Y. Sagara,* Y. C. Simon, N. Tamaoki, C. Weder*
    Chem. Commun. 2016, 52, 5694–5697.
  • 19.“A Thermo- and Mechanoresponsive Cyano-substituted Oligo(p-Phenylene Vinylene) Derivative with Five Emissive States”
    Y. Sagara,* A. Lavrenova, A. Crochet, Y. C. Simon, K. M. Fromm, C. Weder*
    Chem. Eur. J. 2016, 22, 4374–4378.
  • 18.“Mechanoresponsive Luminescent Molecular Assemblies: An Emerging Class of Materials”
    Y. Sagara,* S. Yamane, M. Mitani, C. Weder, T. Kato*
    Adv. Mater. 2016, 28, 1073–1095. (Front Cover Picture)


  • 17.“Mechanochemistry in Polymers with Supramolecular Mechanophores”
    A. P. Haehnel, Y. Sagara, Y. C. Simon,* C. Weder*
    Top. Curr. Chem. 2015, 369, 345−375.
  • 16.“Thermal or Mechanical Stimuli-Induced Photoluminescence Color Change of a Molecular Assembly Composed of an Amphiphilic Anthracene Derivative in Water”
    Y. Sagara, T. Komatsu, T. Terai, T. Ueno, K. Hanaoka, T. Kato, T. Nagano*
    Chem. Eur. J. 2014, 20, 10397−10403.
  • 15.“Covalent Attachment of Mechanoresponsive Luminescent Micelles to Glasses and Polymers in Aqueous Conditions”
    Y. Sagara, T. Komatsu, T. Ueno, K. Hanaoka, T. Kato, T. Nagano*
    J. Am. Chem. Soc. 2014, 136, 4273−4280.
  • 14.“A Water-soluble Mechanochromic Luminescent Pyrene Derivative Exhibiting Recovery of the Initial Photoluminescence Color in a High-humidity Environment”
    Y. Sagara, T. Komatsu, T. Ueno, K. Hanaoka, T. Kato, T. Nagano*
    Adv. Funct. Mater. 2013, 23, 5277–5284.
  • 13.“Steric Effects on Excimer Formation for Photoluminescent Smectic Liquid-crystalline Materials”
    S. Yamane, Y. Sagara, T. Kato*
    Chem. Commun. 2013, 49, 3839–3841.
  • 12.“Mechanochromic Luminescent Liquid Crystals Based on a Bianthryl Moiety”
    Shogo Yamane, Yoshimitsu Sagara, Toshiki Mutai, Koji Araki, Takashi Kato*
    J. Mater. Chem. C 2013, 1, 2648–2656.
  • 11.“Stimuli-Responsive Photoluminescent Liquid Crystals”
    S. Yamane, K. Tanabe, Y. Sagara, T. Kato*
    Top. Curr. Chem. 2012, 318, 395–406.
  • 10.“Brightly Tri-colored Mechanochromic Luminescence from the Single Luminophore of a Liquid Crystal: Reversible Writing and Erasing of the Images”
    Y. Sagara, T. Kato*
    Angew. Chem. Int. Ed. 2011, 50, 9128–9132. (Inside Cover Picture)

  • 9.“Piezochromic Luminescence of Amide and Ester Derivatives of Tetraphenylpyrene—Role of Amide Hydrogen Bonds in Sensitive Piezochromic Response”
    M. Sase, S. Yamaguchi, Y. Sagara, I. Yoshikawa, T. Mutai, K. Araki*
    J. Mater. Chem. 2011, 21, 8347–8354.
  • 8.“A Mechanical and Thermal Responsive Luminescent Liquid Crystal Forming a Colourless Film under Room Light”
    Y. Sagara, T. Kato*
    Supramol. Chem. 2011, 23, 310–314.
  • 7.“A Thermoresponsive Photoluminescent Smectic Liquid Crystal: Change of Photoluminescent Color on the Smectic–Smectic Phase Transition”
    S. Yamane, Y. Sagara, T. Kato*
    Chem. Commun. 2009, 3597–3599.
  • 6.“Mechanically Induced Luminescence Changes in Molecular Assemblies”
    Y. Sagara, T. Kato,*
    Nat. Chem. 2009, 1, 605–610.
  • 5.“A Stimuli-Responsive, Photoluminescent, Anthracene-Based Liquid Crystal: Emission Color Determined by Thermal and Mechanical Processes”
    Y. Sagara, S. Yamane, T. Mutai, K. Araki, T. Kato*
    Adv. Funct. Mater. 2009, 19, 1869–1875.
  • 4.“Stimuli-Responsive Luminescent Liquid Crystals: Change of Photoluminescent Colors Triggered by a Shear-Induced Phase Transition”
    Y. Sagara, T. Kato*
    Angew. Chem. Int. Ed. 2008, 47, 5175–5178.
  • 3.“Material Design for Piezochromic Luminescence: Hydrogen-Bond-Directed Assemblies of a Pyrene Derivative”
    Y. Sagara, T. Mutai, I. Yoshikawa, K. Araki*
    J. Am. Chem. Soc. 2007, 129, 1520–1521.

  • 2.“Uniaxially Parallel Alignment of a Smectic A Liquid-Crystalline Rod−Coil Molecule and Its Lithium Salt Complexes Using Rubbed Polyimides”
    Y. Iinuma, K. Kishimoto, Y. Sagara, M. Yoshio, T. Mukai, I. Kobayashi, H. Ohno, T. Kato*
    Macromolecules 2007, 40, 4874–4878.
  • 1.“Two Dimensionally Ion-Conductive Liquid Crystals of Cholesterol/Tetra(Ethylene Oxide) Block Molecules”
    K. Kishimoto, Y. Sagara, T. Mukai, H. Ohno, N. Tamaoki, T. Kato*
    Mol. Cryst. Liq. Cryst. 2005, 435, 777–785.


  • July 2020
    Prof. Sagara received the Suematsu Challenging Research Award.
  • April 2019
    Prof. Sagara received The Young Scientists’ Prize from MEXT.

Sagara Group

Department of Materials Science and Engineering
Tokyo Institute of Technology

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