Papers
Papers
2025
S. Ito, S. Nagai, M. Ikeya, T. Mashimo, T. Seki, H. Ito, Y. Sagara, T. Mutai, Y. Ooyama, K. Nakano,
J. Mater. Chem. C, 2025,
DOI: 10.1039/D5TC03324A.
T. Seki, M. Ikeda,
Cryst. Growth Des., 2025, 25, 10268–10272
DOI: 10.1021/acs.cgd.5c01174.

T. Seki, T. Okada, M. Ikeda, K. Yamamoto, S. Hayashi, Y. Kishida, H. Uekusa,
J. Am. Chem. Soc., 2025, 147, 27431–27437
DOI: 10.1021/jacs.5c04563.

T. Seki, A. Yano,
Eur. J. Inorg. Chem., 2025, 28, e202400793
DOI: 10.1002/ejic.202400793.
Very Important Paperに選出

T. Seki, R. Ishikawa,
Chem. Eur. J., 2025, 31, e202404241
DOI: 10.1002/chem.202404241.

2024
T. Seki, T. Okada,
Chem. Eur. J., 2024, 30, e202402622
DOI: 10.1002/chem.202402622.

T. Seki, S. Kobayashi, R. Ishikawa, K. Yano, T. Matsuo, S. Hayashi,
Chem. Sci., 2024, 15, 12258–12263
DOI: 10.1039/d4sc02918f.

T. Seki, K. Hattori,
RSC Adv., 2024, 14, 7258–7262
DOI: 10.1039/d3ra08519h.

2023
T. Seki, D. Korenaga,
Chem. Eur. J., 2023, 29, e202302333
DOI: 10.1002/chem.202302333.
selected as

Y. Zhao, Dr. T. Nakae, Dr. S. Takeya, Dr. M. Hattori, Dr. D. Saito, Prof. M. Kato, Dr. Y. Ohmasa, S. Sato, Prof. O. Yamamuro, Dr. T. Galica, Prof. E. Nishibori, S. Kobayasi, Dr. T. Seki, Prof. T. Yamada, Dr. Y. Yamanoi,
Chem. Eur. J., 2023, 29, e202204002
DOI: 10.1002/chem.202204002.
2022
C. Feng, T. Seki, S. Sakamoto, T. Sasaki, S. Takamizawa, H. Ito,
Chem. Sci., 2022, 13, 9544–9551
DOI: 10.1039/D2SC03414J.

Shape-memory materials can be mechanically deformed and subsequently reverse the deformation upon changing the temperature. Shape-memory materials have attracted considerable attention for basic research and industrial applications, and polymer and alloy shape-memory materials have been well studied; however, it is formidably challenging to develop functional shape-memory materials, such as materials with multi-stage and anisotropic shape changes and shape changes accompanied by changes in color and light emission. Here, we found a reversible multi-stage shape-changing effect after mechanical deformation in a molecular crystal induced by multi-step thermal phase transitions with reversible shape changes and luminescence-color changes. Using single-crystal structure and thermal analyses as well as mechanical property measurements, we found that the reversible multi-stage shape-changing effect was achieved by a combination of a twinning deformation and multi-step thermal phase transitions. The changes in the crystal shape and luminescence suggest novel strategies for imparting known shape-memory materials with additional functionalities.
2021
T. Seki, N. Hoshino, Y. Suzuki, S. Hayashi,
CrystEngComm, 2021, 23, 5686–5696
DOI: 10.1039/D1CE00388G.

K. Kato, T. Seki, H. Ito,
Inorg. Chem, 2021, 60, 10849–10856
DOI: 10.1021/acs.inorgchem.1c00881.

S. Matsuura, J. Taguchi, T. Seki, H. Ito,
Bull. Chem. Soc. Jpn., 2021, 94, 1547–1552
DOI: 10.1246/bcsj.20210024.

2020
K. Omoto, T. Nakae, M. Nishio, Y. Yamanoi, H. Kasai, E. Nishibori, T. Mashimo, T. Seki, H. Ito, K. Nakamura, N. Kobayashi, N. Nakayama, H. Goto, H. Nishihara,
J. Am. Chem. Soc., 2020, 142, 12651–12657
DOI: 10.1021/jacs.0c03643.
T. Aizawa, K. Aratsu, S. Datta, T. Mashimo, T. Seki, T. Kajitani, F. Sillye, S. Yagai,
Chem. Commun., 2020, 56, 4280–4283
DOI: 10.1039/D0CC01636E.
T. Seki, C. Feng, K. Kashiyama, S. Sakamoto, Y. Takasaki, T. Sasaki, S. Takamizawa, H. Ito,
Angew. Chem., Int. Ed., 2020, 59, 8839–8843
DOI: 10.1002/anie.201914610.

T. Seki, N. Toyoshima, H. Ito,
Dalton Trans., 2020, 49, 2073–2076
DOI: 10.1039/D0DT00195C.

J. Taguchi, S. Matsuura, T. Seki, H. Ito,
Chem. Eur. J., 2020, 26, 2450–2455
DOI: 10.1002/chem.201904983.

Y. Kitagawa, F. Suzue, T. Nakanishi, K. Fushimi, T. Seki, H. Ito, Y. Hasegawa,
Commun. Chem., 2020, 3, 3
DOI: 10.1038/s42004-019-0251-z.
T. Seki, T. Mashimo, H. Ito,
Chem. Lett., 2020, 49, 174–177
DOI: 10.1246/cl.190768.

T. Seki, K. Ida, H. Sato, S. Aono, S. Sakaki, H. Ito,
Chem. Eur. J., 2020, 26, 735–744
DOI: 10.1002/chem.201904597.

2019
M. Jin, S. Yamamoto, T. Seki, H. Ito, M.A. Garcia-Garibay,
Angew. Chem. Int. Ed., 2019, 58, 18003–18010
DOI: 10.1002/anie.201909048.

R. Shishido, I. Sasaki, T. Seki, T. Ishiyama, H. Ito,
Chem. Eur. J., 2019, 25, 12924 – 12928
DOI: 10.1002/chem.201903776.

Y. Hasegawa, T. Matsui, Y. Kitagawa, T. Nakanishi, T. Seki, H. Ito, Y. Nakasaka, T. Masuda, K. Fushimi,
Chem. Eur. J., 2019, 25, 12308–12315
DOI: 10.1002/chem.201902583.
T. Seki, T. Mashimo, H. Ito,
Chem. Sci., 2019, 10, 4185–4191
DOI: 10.1039/C8SC05563G.

T. Seki, K. Kashiyama, H. Ito,
Dalton Trans., 2019, 48, 7105–7109
DOI: 10.1039/C9DT00566H.
Themed issue: “New Talent: Asia-Pacific, 2019”

S. Aono, T. Seki, H. Ito, S. Sakaki,
J. Phys. Chem. C., 2019, 123, 4773–4794
DOI: 10.1021/acs.jpcc.8b10602.

2018
N. Nakayama, S. Obata, Y. Hori, H. Goto, T. Seki, H. Ito,
J. Comput. Chem. Jpn., 2018, 17, 155–157
DOI: 10.2477/jccj.2018-0031.
Y. Hirai, P. P. F. Da Rosa, T. Nakanishi, Y. Kitagawa, K. Fushimi, T. Seki, H. Ito, Y. Hasegawa,
Inorg. Chem., 2018, 57, 14653–14659
DOI: 10.1021/acs.inorgchem.8b02367.
M. Ito, A. Mera, T. Mashimo, T. Seki, S. Karanjit, E. Ohashi, A. Nakayama, K. Kitamura, T. Hamura, H. Ito, K. Namba,
Chem. Eur. J., 2018, 24, 17727–17733
DOI: 10.1002/chem.201804733.
T. Seki, K. Kobayashi, T. Mashimo, H. Ito,
Chem. Commun., 2018, 54, 13160–13160
DOI: 10.1039/C8CC06490C.

Correction: A gold isocyanide complex with a pendant carboxy group: orthogonal molecular arrangements and hypsochromically shifted luminescent mechanochromism
https://pubs.rsc.org/en/content/articlelanding/2018/cc/c8cc90488j
Y. Hasegawa, Y. Miura, Y. Kitagawa, S. Wada, T. Nakanishi, K. Fushimi, T. Seki, H. Ito, T. Iwasa, T. Taketsugu, M. Gon, Y. Chujo, S. Hattori, M. Karasawa, K. Ishii,
Chem. Commun., 2018, 54, 10695–10697
DOI: 10.1039/C8CC05147J.
T. Kobayashi, Y. Kitamoto, Y. Hirai, T. Kajitani, T. Seki, S. Yagai,
Commun. Chem., 2018, 1, 58
DOI: 10.1038/s42004-018-0061-8.
S. Omagari, T. Nakanishi, Y. Kitagawa, T. Seki, K. Fushimi, A. Meijerink, Y. Hasegawa,
J. Lumin., 2018, 201, 170–175
DOI: 10.1016/j.jlumin.2018.04.049.
T. Seki, K. Ida, H. Ito,
Mater. Chem. Front., 2018, 2, 1195–1200
DOI: 10.1039/C8QM00074C.

P. P. F. Da Rosa, T. Nakanishi, Y. Kitagawa, T. Seki, H. Ito, K. Fushimi, Y. Hasegawa,
Eur. J. Inorg. Chem., 2018, , 2031–2037
DOI: 10.1002/ejic.201800281.
M. Jin, T. Sumitani, H. Sato, T. Seki, H. Ito,
J. Am. Chem. Soc., 2018, 140, 2875–2879
DOI: 10.1021/jacs.7b12455.

K. Yanagisawa, Y. Kitagawa, T. Nakanishi, T. Seki, K. Fushimi, H. Ito, Y. Hasegawa,
Chem. Eur. J., 2018, 24, 1956–1961
DOI: 10.1002/chem.201705021.
M. Yamamoto, T. Nakanishi, Y. Kitagawa, T. Seki, H. Ito, K. Fushimi, Y. Hasegawa,
Bull. Chem. Soc. Jpn., 2018, 91, 6–11
DOI: 10.1246/bcsj.20170241.
S. Omagari, T. Nakanishi, Y. Hirai, Y. Kitagawa, T. Seki, K. Fushimi, H. Ito, Y. Hasegawa,
Eur. J. Inorg. Chem., 2018, , 561–567
DOI: 10.1002/ejic.201701040.
2017
M. Jin, T. J. Chung, T. Seki, H. Ito, M. A. Garcia-Garibay,
J. Am. Chem. Soc., 2017, 139, 18115 –18121
DOI: 10.1021/jacs.7b11316.

E. Yamamoto, R. Shishido, T. Seki, H. Ito,
Organometallics., 2017, 36, 3019–3022
DOI: 10.1021/acs.organomet.7b00476.
K. Yanagisawa, Y. Kitagawa, T. Nakanishi, T. Akama, M. Kobayashi, T. Seki, K. Fushimi, H. Ito, T. Taketsugu, Y. Hasegawa,
Eur. J. Inorg. Chem., 2017, 2017, 3843–3848
DOI: 10.1002/ejic.201700815.
T. Seki, K. Kashiyama, S. Yagai, H. Ito,
Chem. Lett., 2017, 46, 1415–1418
DOI: 10.1246/cl.170482.

M. Jin, T. Seki, H. Ito,
J. Am. Chem. Soc., 2017, 139, 7452–7455
DOI: 10.1021/jacs.7b04073.

T. Seki, K. Kobayashi, H. Ito,
Chem. Commun., 2017, 53, 6700–6703
DOI: 10.1039/C7CC03190D.
Highlighted as a Back Cover in Issue 50, 2017

T. Seki, N. Tokodai, S. Omagari, T. Nakanishi, Y. Hasegawa, T. Iwasa, T. Taketsugu, H. Ito,
J. Am. Chem. Soc., 2017, 139, 6514–6517
DOI: 10.1021/jacs.7b00587.
・北海道大学 PRESS RELEASE ・Hokkaido Univ. Press Release (English Ver.)

Y. Hirai, T. Nakanishi, Y. Kitagawa, K. Fushimi, T. Seki, H. Ito, Y. Hasegawa,
Angew. Chem. Int. Ed., 2017, 56, 7171–7175
DOI: 10.1002/anie.201703638.
Y. Hasegawa, S. Tateno, M. Yamamoto, T. Nakanishi, Y. Kitagawa, T. Seki, H. Ito, K. Fushimi,
Chem. Eur. J., 2017, 23, 2666–2672
DOI: 10.1002/chem.201605054.
2016
S. Omagari, T. Nakanishi, Y. Kitagawa, T. Seki, K. Fushimi, H. Ito, A. Meijerink, Y. Hasegawa,
Sci. Rep., 2016, 6, 37008
DOI: 10.1038/srep37008.
T. Seki, M. Jin, H. Ito,
Inorg. Chem., 2016, 55, 12309–12320
DOI: 10.1021/acs.inorgchem.6b02107.

E. Yamamoto, K. Izumi, R. Shishido, T. Seki, N. Tokodai, H. Ito,
Chem. Eur. J., 2016, 22, 17547– 17551
DOI: 10.1002/chem.201604021.
Y. Hirai, T. Nakanishi, Y. Kitagawa, K. Fushimi, T. Seki, H. Ito, Y. Hasegawa,
Angew. Chem., Int. Ed., 2016, 55, 12059–12062
DOI: 10.1002/anie.201606371.
M. Jin, T. Seki, H. Ito,
Chem. Commun., 2016, 52, 8083–8086
DOI: 10.1039/C6CC03541H.
Highlighted as an Inside Back Cover in Issue 52, 2016

T. Seki, Y. Takamatsu, H. Ito,
J. Am. Chem. Soc., 2016, 138, 6252 –6260
DOI: 10.1021/jacs.6b02409.
・Selected as “JACS Spotligahts“ DOI: 10.1021/jacs.6b04902 ・Selected as “ACS Editor’s Choice“ (May 11, 2016, Open Access) ・北海道大学 PRESS RELEASE ・Hokkaido Univ. Press Release (English Ver.)

A. Nakajima, T. Nakanishi, Y. Kitagawa, T. Seki, H. Ito, K. Fushimi, Y. Hasegawa,
Sci. Rep., 2016,
DOI: 10.1038/srep24458.
T. Seki, K. Sakurada, M. Muromoto, S. Seki, H. Ito,
Chem. Eur. J., 2016, 18, 7217 –7220
DOI: 10.1039/C5CE02565F.

T. Seki, H. Ito,
Chem. Eur. J., 2016, 22, 4322–4329
DOI: 10.1002/chem.201504361.
T. Seki, K. Sakurada, M. Muromoto, S. Seki, H. Ito,
Chem. Eur. J., 2016, 22, 6, 1968–1978
DOI: 10.1002/chem.201503721.
Highlighted as an Inside Cover in Issue 6, 2016

2015
S. Yagai, T. Seki, H. Aonuma, K. Kawabuchi, T. Karatsu, T. Okura, A. Sakon, H. Uekusa, H. Ito,
Chem. Mat., 2015, 28, 234 – 241
DOI: 10.1021/acs.chemmater.5b03932.

K. Yanagisawa, T. Nakanishi, Y. Kitagawa, T. Seki, T. Akama, M. Kobayashi, T. Taketsugu, H. Ito, K. Fushimi, Y. Hasegawa,
Eur. J. Inorg. Chem., 2015, , 4769–4774
DOI: 10.1002/ejic.201500820.
T. Seki, K. Sakurada, H. Ito,
Chem. Comm., 2015, 51, 13933–13936
DOI: 10.1039/C5CC04609B.

Y. Hasegawa, N. Sato, Y. Hirai, T. Nakanishi, Y. Kitagawa, A. Kobayashi, M. Kato, T. Seki, H. Ito, K. Fushimi,
J. Phys. Chem. A, 2015, 119, 4825 –4833
DOI: 10.1021/acs.jpca.5b01809.
Y. Hirai, T. Nakanishi, Y. Kitagawa, K. Fushimi, T. Seki, H. Ito, H. Fueno, K. Tanaka, T. Sato, Y. Hasegawa,
Inorg. Chem., 2015, 54, 4364–4370
DOI: 10.1021/acs.inorgchem.5b00145.
S. Omagari, T. Nakanishi, T. Seki, Y. Kitagawa, Y. Takahata, K. Fushimi, H. Ito, Y. Hasegawa,
J. Phys. Chem. A, 2015, 119, 1943–1947
DOI: 10.1021/jp512892f.
T. Seki, T. Ozaki, T. Ohkura, K. Asakura, A. Sakon, H. Uekusa, H. Ito,
Chem. Sci., 2015, 6, 2187–2195
DOI: 10.1039/C4SC03960B.

T. Seki, K. Sakurada, M. Muromoto, H. Ito,
Chem. Sci., 2015, 6, 1491–1497
DOI: 10.1039/C4SC02676D.
Open Access Article.

2014
T. Nakanishi, Y. Suzuki, Y. Doi, T. Seki, H. Koizumi, K. Fushimi, K. Fujita, Y. Hinatsu, H. Ito, K. Tanaka, Y. Hasegawa,
inorg. Chem., 2014, 53, 7635–7641
DOI: 10.1021/ic5009363.
S. Yagai, S. Okamura, Y. Nakano, M. Yamauchi, K. Kishikawa, T. Karatsu, A. Kitamura, A. Ueno, D. Kuzuhara, H. Yamada, T. Seki, H. Ito,
Nature Communications, 2014, , 4013
DOI: 10.1038/ncomms5013.
X. Lin, M. Hirono, H. Kurata, T. Seki, Y. Maruya, K. Nakayama, S. Yagai,
Asi. J. Org. Chem., 2014, 3, 128 –132
DOI: 10.1002/ajoc.201300252.
2013
K. Kawaguchi, T. Seki, T. Karatsu, A. Kitamura, H. Ito, S. Yagai,
Chem. Commun., 2013, 19, 11391–11394
DOI: 10.1039/C3CC47162D.
T. Seki, K. Sakurada, H. Ito,
Angew. Chem., Int. Ed., 2013, 52, 12828–12832
DOI: 10.1002/anie.201307672.
VIP paper Highlighted as a Frontispiece in Issue 49, 2013

T. Seki, S. Kurenuma, H. Ito,
Chem. Eur. J., 2013, 19, 16214–16220
DOI: 10.1002/chem.201303394.
Highlighted as a Frontispiece in Issue 48, 2013

Y. Tani, T. Seki, X. Lin, H. Kurata, S. Yagai, K. Nakayama,
Mol. Cryst. Liq. Cryst., 2013, 578, 88–94
DOI: 10.1080/15421406.2013.804393.
Y. Hasegawa, T. Ohkubo, T. Nakanishi, A. Kobayashi, M. Kato, T. Seki, H. Ito, K. Fushimi,
Eur. J. Inorg. Chem., 2013, , 5911 –5918
DOI: 10.1002/ejic.201301102.
H. Ito, M. Muromoto, S. Kurenuma, S. Ishizaka, N. Kitamura, H. Sato, T. Seki,
Nature Communications, 2013, 4, 2009
DOI: 10.1038/ncomms3009.

X. Lin, M. Hirono, T. Seki, H. Kurata, T. Karatsu, A. Kitamura, D. Kuzuhara, H. Yamada, T. Ohba, A. Saeki, S. Seki, S. Yagai,
Chem. Eur. J., 2013, 19, 6561–6565
DOI: 10.1002/chem.201300039.
T. Seki, X. Lin, S. Yagai, T. Nakanishi,
Asi. J. Org. Chem., 2013, 2, 708–724
DOI: 10.1002/ajoc.201300025.

H. Li, S. S. Babu, S. T. Turner, D. Neher, M. J. Hollamby, T. Seki, S. Yagai, Y. Deguchi, H. Mohwalda, T. Nakanishi,
J. Mater. Chem. C, 2013, 1, 1943–1951
DOI: 10.1039/c3tc00066d.
2012
S. Yagai, M. Usui, T. Seki, H. Murayama, Y. Kikkawa, S. Uemura, T. Karatsu, A. Kitamura, A. Asano, S. Seki,
J. Am. Chem. Soc., 2012, 134, 7983–7994
DOI: 10.1021/ja302574b.
T. Seki, S. Yagai, T. Karatsu, A. Kitamura,
Polymer Journal, 2012, 44, 600–606
DOI: 10.1038/pj.2012.22.
2011
T. Seki, Y. Maruya, K. Nakayama, T. Karatsu, A. Kitamura, S. Yagai,
Chem. Commun., 2011, 47, 12447–12449
DOI: 10.1039/c1cc15118e.
Selected as “Back Cover”

H. Li, M. J. Hollamby, T. Seki, S. Yagai, H. Mohwald, T. Nakanishi,
Langmuir, 2011, 27, 7493–7501
DOI: 10.1021/la2015176.
T. Seki, A. Asano, S. Seki, Y. Kikkawa, H. Murayama, T. Karatsu, A. Kitamura, S. Yagai,
Chem. Eur. J., 2011, 17, 3598–3608
DOI: 10.1002/chem.201003540.
Selected as “Frontispiece”.

2010
S. Yagai, T. Seki, H. Murayama, Y. Wakikawa, T. Ikoma, T. Karatsu, A. Kitamura, Y. Honsho, S. Seki,
Small, 2010, 6, 2731– 2740
DOI: 10.1002/smll.201001344.
Y. Shen, A. G. Skirtach, T. Seki, S. Yagai, H. Li, H. Mowald, T. Nakanishi,
J. Am. Chem. Soc., 2010, 132, 8566 –8568
DOI: 10.1021/ja1026024.
2009
S. Yagai, Hamamura, S.H. Wang, V. Stepanenko, T. Seki, K. Unoike, Y. Kikkawa, T. Karatsu, A. Kitamura,
Org. Biomol. Chem., 2009, 7, 3926–3929
DOI: 10.1039/b912809c.
2008
T. Seki, S. Yagai, T. Karatsu, A. Kitamura,
Chem. Lett., 2008, 73, 3328 –3335
DOI: 10.1246/cl.2008.764.
T. Seki, S. Yagai, T. Karatsu, A. Kitamura,
J. Org. Chem., 2008, 73, 3328– 3335
DOI: 10.1021/jo800338f.
Selected as “Featured Article”
S. Yagai, T. Seki, T. Karatsu, A. Kitamura, F. Wurthner,
Angew. Chem. Int.Ed., 2008, 47, 3367–3371
DOI: 10.1002/anie.200705385.

