Kotaro Fujii 

Assistant Professor

School of Chemistry

Tokyo Institute of Technology

Publications

2012

Mechanism of Dehydration–Hydration Processes of Lisinopril Dihydrate Investigated by ab Initio Powder X-ray Diffraction Analysis
Kotaro Fujii, Hidehiro Uekusa, Naoko Itoda, Etsuo Yonemochi, Katsuhide Terada
Cocrystallization and amorphization induced by drug–excipient interaction improves the physical properties of acyclovir
Takaaki Masuda, Yasuo Yoshihashi, Etsuo Yonemochi, Kotaro Fujii, Hidehiro Uekusa, Katsuhide Terada
Guest-induced self-assembly of a macrocyclic boronic ester containing diarylethene units: enhancement of photoresponsivity
Nobuharu Iwasawa , Hiroki Takahagi , Kosuke Ono , Kotaro Fujii, Hidehiro Uekusa

2011

Structure Determination from Powder X-ray Diffraction Data of a New Polymorph of a High-Density Organic Hydrate Material, with an Assessment of Hydrogen-Bond Disorder by Rietveld Refinement
Gin Keat Lim, Kotaro Fujii, Kenneth D. M Harris, David C. Apperley
Reversible Color Switching of an Organic Crystal Induced by Organic Solvent Vapors
Kotaro Fujii, Aya Sakon, Akiko Sekine, Hidehiro Uekusa
連載企画 有機粉末構造解析をはじめよう! 「試料準備から測定まで」
藤井 孝太郎、植草 秀裕
連載企画 有機粉末構造解析をはじめよう! 「粉末未知結晶構造解析の紹介」
植草 秀裕、藤井 孝太郎
Cooperativity in Solid-State Squaramides
Rafel Prohens, Anna Portell, Cristina Puigjaner, Salvador Tomas, Kotaro Fujii, Kenneth D. M. Harris, Xavier Alcobe, Merce Font-Bardia, Rafael Barbas
Supramolecular Networks in Crystalline Inclusion Complexes Formed from a New Host: 2,2-Bis(4-hydroxy-3-phenylphenyl)-1H-indene-1,3(2H)-dione
Kenta Kasugai, Suzumi Hashimoto, Kazunori Imai, Aya Sakon, Kotaro Fujii, Hidehiro Uekusa, Naoto Hayashi, Keiji Kobayashi
Structural Chemistry of a New Chiral Anhydrous Phase of Ru(bipy)3(ClO4) 2 Established from Powder X-ray Diffraction Analysis
Eugene Y. Cheung, Kotaro Fujii, Fang Guo, Kenneth D. M. Harris, Sayoko Hasebe, Reiko Kuroda
Potential of synchrotron X-ray powder diffractometry for detection and quantification of small amounts of crystalline drug substances in pharmaceutical tablets
Hiroyuki Yamada, Katsuhiko Masuda, Takayuki Ishige, Kotaro Fujii, Hidehiro Uekusa, Keiko Miura, Etsuo Yonemochi, Katsuhide Terada
Exploiting powder X-ray diffraction for direct structure determination in structural biology: The P2X4 receptor trafficking motif YEQGL
Kotaro Fujii, Mark T. Young, Kenneth D.M. Harris
Metastable polymorphic form of isopropylbenzophenone derivative directly obtained by the solid-state photoreaction investigated by ab initio powder X-ray diffraction analysis
Kotaro Fujii, Hidehiro Uekusa, Michitaro Fukano,Hideko Koshima
粉末結晶解析を用いた溶媒蒸気による多形転移現象の解析
藤井孝太郎、植草 秀裕
化学工業, 64(4), 262-268 (2011).
In situ observation and mechanistic elucidation of metastable colored species in crystalline state photochromism of trans-biindenylidenedione
Kotaro Fujii, Kumiko Aruga, Akiko Sekine, Hidehiro Uekusa, Katsuya Sohno, Koichi Tanaka
Study of the Pseudo-Crystalline Transformation from Form I to Form II of Thiamine Hydrochloride (Vitamin B1)
Katsuhiko Masuda, Takayuki Ishige, Hiroyuki Yamada, Kotaro Fujii, Hidehiro Uekusa, Keiko Miura, Etsuo Yonemochi, Katsuhide Terada

2010

Cocrystalline phase transformation of binary mixture of trimethoprim and sulfamethoxazole by slurry technique
Erizal Zaini, Yeyet C. Sumirtapura, Sundani N. Soewandhi, Auzal Halim, Hidehiro Uekusa, Kotaro Fujii
Asian Journal of Pharmaceutical and Clinical Research, 3(4), 26-29 (2010).
Direct structure elucidation by powder X-ray diffraction of a metal–organic framework material prepared by solvent-free grinding
Kotaro Fujii, Ana Lazuen Garay, Janeen Hill, Elena Sbircea, Zhigang Pan, Mingcan Xu, David C. Apperley, Stuart L. James, Kenneth D. M. Harris
Potassium clavulanate
Kotaro Fujii, Kazuyuki Toyota, Akiko Sekine, Hidehiro Uekusa, Ilma Nugrahani, Sukmadjaja Asyarie, N. Sundani Soewandhi, Slamet Ibrahim
Acta Cryst., E66(8), m985-m986 (2010).
Arrays of P═O Dipoles As a Recurrent Structural Motif in Bis-Diphenylphosphine Oxides, Established from Powder X-ray Diffraction
Gin Keat Lim, Zhongfu Zhou, Kotaro Fujii, Patrizia Calcagno, Emilio Tedesco, Simon J. Kitchin, Benson M. Kariuki, Douglas Philp, Kenneth D. M Harris
A Solid-State Dehydration Process in an Organic Material Associated with Substantial Hydrogen-Bond Reorganization, Investigated by Powder X-ray Diffraction
Javier Marti-Rujas, Anabel Morte-Rodenas, Fang Guo, Nigel Thomas, Kotaro Fujii, Benson M. Kariuki, Kenneth D. M Harris
Selective transformation pathways between crystalline forms of an organic material established from powder X-ray diffraction analysis
Kotaro Fujii, Yasunari Ashida, Hidehiro Uekusa, Fang Guo, Kenneth D. M. Harris
Chem. Commun., 46(24), 4264-4266 (2010).
Hexaradialenes by Successive Ring Openings of Tris(alkoxytricyclobutabenzenes): Synthesis and Characterization
Shinya Shinozaki, Toshiyuki Hamura, Yousuke Ibusuki, Kotaro Fujii, Hidehiro Uekusa, Keisuke Suzuki
Angew. Chem. Int. Ed., 49(1), 3026-3029 (2010).
Physicochemical Understanding of Polymorphism and Solid-State Dehydration/Rehydration Processes for the Pharmaceutical Material Acrinol, by Ab Initio Powder X-ray Diffraction Analysis and Other Techniques
Kotaro Fujii, Hidehiro Uekusa, Naoko Itoda, Gen Hasegawa, Etsuo Yonemochi, Katsuhide Terada, Zhigang Pan, Kenneth D. M. Harris
J. Phys. Chem. C, 114(1), 580-586 (2010).

2009

Partial ferromagnetic ordering and indirect exchange interaction in the spatially anisotropic kagome antiferromagnet Cs2Cu3CeF12
T. Amemiya, M. Yano, K. Morita, I. Umegaki, T. Ono, H. Tanaka, K. Fujii, H Uekusa
Phys. Rev. B, 80(10), 100406/1-100406/4 (2009).
Dihydrochalcone Designed from Methylophiopogonanone B Strongly Inhibits Hypoxia-inducible Factor (HIF)-1α Activity
Mikio Fujii, Kiyoshi Egawa, Yasuaki Hirai, Masato Kondo, Kotaro Fujii, Hidehiro Uekusa, Hiroyuki Akita, Kiyoshi Nose, Kazuo Toriizuka, Yoshiteru Ida
Heterocycles, 78(8), 2061-2065 (2009).
Magnetic susceptibilities in a family of S = 1/2 kagome antiferromagnets
T. Ono, K. Morita, M. Yano, H. Tanaka, K. Fujii, H. Uekusa, Y. Narumi, K Kindo
Phys. Rev. B, 79(17), 174407/1-174407/11 (2009).
Chiral Tetraazamacrocycles Having Four Pendant-Arms
Seiji Kamioka, Takashi Takahashi, Susumu Kawauchi, Hiroaki Adachi, Yusuke Mori, Kotaro Fujii, Hidehiro Uekusa, Takayuki Doi
Org. Lett., 11(11), 2289-2292 (2009).
Performance of the micro-PIC gaseous area detector in small-angle X-ray scattering experiments.
Kaori Hattori, Ken'ichi Tsuchiya, Kazuki Ito, Yoko Okada, Kotaro Fujii, Hidetoshi Kubo, Kentaro Miuchi, Masaki Takata, Toru Tanimori, Hidehiro Uekusa
J. Synch. Rad., 16(2), 231-236 (2009).
Reevaluation of solubility of tolbutamide and polymorphic transformation from Form I to unknown crystal form
Gen Hasegawa, Takao Komasaka, Rui Bando, Yasuo Yoshihashi, Etsuo Yonemochi, Kotaro Fujii, Hidehiro Uekusa, Katsuhide Terada
Int. J. Pharm., 369(1-2), 12-18 (2009).
Vapor Induced Crystalline Transformation Investigated by ab initio Powder X-ray Diffraction Analysis.
Kotaro Fujii, Yasunari Ashida, Hidehiro Uekusa, Shinya Hirano, Shinji Toyota, Fumio Toda, Zhigang Pan, Kenneth D. M. Harris
Cryst. Growth & Des., 9(2), 1201-1207 (2009).

2008

粉末X線結晶構造解析で解明する5-メチル-2-ピリドン共結晶の光反応性と転移現象
藤井 孝太郎, 植草 秀裕
日本結晶学会誌, 50(6), 335-340 (2008)
Singlet ground state and spin gap in S = 1/2 Kagome antiferromagnet Rb2Cu3SnF12.
Katsuhiro Morita, Midori Yano, Toshio Ono, Hidekazu Tanaka, Kotaro Fujii, Hidehiro Uekusa, Yasuo Narumi, Koichi Kindo
J. Phys. Soc. Jpn., 77(4), 043707/1-043707/4 (2008).
Single-crystal-to-single-crystal photocyclization of 4-(2,4,6-triisopropylbenzoyl)benzoic acid in the salt crystal with (S)-phenylethylamine.
Hideko Koshima, Yuya Ide, Michitaro Fukano, Kotaro Fujii, Hidehiro Uekusa
Tetrahedron Lett., 49(28), 4346-4348 (2008).

2007

粉末X線回折データを用いる有機化合物の結晶構造解析
津江 広人,堀口 雅弘,田村 類,藤井 孝太郎,植草 秀裕
有機合成化学協会誌, 65(12), 1203-1212 (2007).

2006

Multiple pentafluorophenylation of 2,2,3,3,5,6,6-heptafluoro-3,6-dihydro-2H-1,4-oxazine with an organosilicon reagent: NMR and DFT structural analysis of oligo(perfluoroaryl) compounds.
Masakazu Nishida, Haruhiko Fukaya, Yoshio Hayakawa, Taizo Ono, Kotaro Fujii, Hidehiro Uekusa
Helv. Chim. Acta, 89(11), 2671-2685, (2006).
Solid-state phase transition of an inclusion complex of 5-methyl-2-pyridone with 1,3,5-benzenetricarboxylic acid.
Shinya Hirano, Shinji Toyota, Fumio Toda, Kotaro Fujii, Hidehiro Uekuasa
Angew. Chem. Int. Ed., 45(36), 6013-6016, (2006).