Al₂F₉^3- in [C₁₈MIm]₃[Al₂F₉]
F. Xu, K. Matsumoto, R. Hagiwara, Dalton Trans., 42 (2013) 1965－1968.

(Left) cis-N(SO₂F)₂^- in Form II of Na[N(SO₂F)₂] and (Right) trans-N(SO₂F)₂^- in Form I of Na[N(SO₂F)₂]
K. Matsumoto, T. Oka, T. Nohira, R. Hagiwara, Inorg. Chem., 52 (2013) 568-576.

[N(C₂H₅)₄][PO₂F₂]
K. Matsumoto, T. Ohkawa, R. Hagiwara, Chem. Lett., 41 (2012) 394-396.

[C₁₈MIm][PF₆] (isostructural with AsF₆^-, SbF₆^-, NbF₆^-, and TaF₆^- salts)
F. Xu, K. Matsumoto, R. Hagiwara, Dalton Transactions, 41 (2012) 3494–3502.

[DMIm][(FH)₂F]
Takeshi Enomoto, Kazuhiko Matsumoto, Rika Hagiwara, J. Phys. Chem. C, 115 (2011) 4324-4332.

Mo₂O₄F₆^2- in [BPy][MoO₂F₃] (BPy=1-butylpyridinium)
T. Kanatani, K. Matsumoto, R. Hagiwara, Eur. J. Inorg. Chem. 2010, 1049-1055.

(VOF₄^-)₂ unit in [EMIm][VOF₄] (EMIm=1-ethyl-3-methylimidazolium)
T. Kanatani, K. Matsumoto, R. Hagiwara, Eur. J. Inorg. Chem. 2010, 1049-1055.

[BMPip][PO₂F₂]
K. Matsumoto, R. Hagiwara, Inorg. Chem. 48 (2009) 7350-7358.

[EMIm][BF₄]
K. Matsumoto, R. Hagiwara, Z. Mazej, P. Benkic, B. Zemva, Solid State Sci. 8 (2006) 1250-1257.

[EMIm][SbF₆]
K. Matsumoto, R. Hagiwara, R. Yoshida, Y. Ito, Z. Mazej, P. Benkic, B. Zemva, O. Tamada, H. Yoshino, S. Matsubara,
Dalton Trans. 2004, 144-149.

Coordination environement around Li⁺ in Li[EMIm]₂[TFSA]₃
K. Matsumoto, R. Hagiwara, O. Tamada, Solid State Sci. 8 (2006) 1103-1107.

Coordination environement around Li⁺ in Li[BF₄]
K. Matsumoto, R. Hagiwara, Z. Mazej, E. Goreshnik, B. Zemva, J. Phys. Chem. B 110 (2006) 2138-2141.

[EMIm]₃[LaCl₆]
K. Matsumoto, T. Tsuda, T. Nohira, R. Hagiwara, Y. Ito, O. Tamada, Acta Cryst. C58 (2002) m186-m187.

[EMIm][FHF]
K. Matsumoto, T. Tsuda, R. Hagiwara, Y. Ito, O. Tamada, Solid State Sci. 4 (2002) 23-26.