Hajime Okajima

1.3k total citations
35 papers, 1.1k citations indexed

About

Hajime Okajima is a scholar working on Materials Chemistry, Electronic, Optical and Magnetic Materials and Organic Chemistry. According to data from OpenAlex, Hajime Okajima has authored 35 papers receiving a total of 1.1k indexed citations (citations by other indexed papers that have themselves been cited), including 16 papers in Materials Chemistry, 11 papers in Electronic, Optical and Magnetic Materials and 8 papers in Organic Chemistry. Recurrent topics in Hajime Okajima's work include Magnetism in coordination complexes (9 papers), Photochemistry and Electron Transfer Studies (5 papers) and Photochromic and Fluorescence Chemistry (4 papers). Hajime Okajima is often cited by papers focused on Magnetism in coordination complexes (9 papers), Photochemistry and Electron Transfer Studies (5 papers) and Photochromic and Fluorescence Chemistry (4 papers). Hajime Okajima collaborates with scholars based in Japan, Taiwan and China. Hajime Okajima's co-authors include Hiro‐o Hamaguchi, Satyen Saha, Koichi Iwata, Akira Sakamoto, Osamu Sato, Shinji Kanegawa, Yoshihito Shiota, Kazunari Yoshizawa, Shu‐Qi Wu and Masahiro Ando and has published in prestigious journals such as Journal of the American Chemical Society, Angewandte Chemie International Edition and Nature Communications.

In The Last Decade

Hajime Okajima

34 papers receiving 1.0k citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name h Career Trend Papers Cites
Hajime Okajima Japan 17 445 239 237 232 170 35 1.1k
Toshifumi Iimori Japan 19 382 0.9× 122 0.5× 311 1.3× 197 0.8× 353 2.1× 77 1.1k
Daryl B. Wong United States 16 337 0.8× 225 0.9× 135 0.6× 39 0.2× 205 1.2× 16 1.5k
Mamoru Imanari Japan 21 284 0.6× 264 1.1× 342 1.4× 57 0.2× 90 0.5× 63 1.1k
Akio Kawai Japan 22 577 1.3× 512 2.1× 350 1.5× 120 0.5× 269 1.6× 99 1.7k
Andrey Kh. Vorobiev Russia 17 311 0.7× 113 0.5× 38 0.2× 167 0.7× 135 0.8× 61 757
M. Burgar Slovenia 19 476 1.1× 168 0.7× 111 0.5× 286 1.2× 85 0.5× 36 1.2k
Nigel A. Young United Kingdom 19 580 1.3× 223 0.9× 74 0.3× 252 1.1× 146 0.9× 81 1.4k
Kenichi Koizumi Japan 21 539 1.2× 216 0.9× 92 0.4× 432 1.9× 109 0.6× 63 1.4k
Martin Thämer Germany 14 310 0.7× 78 0.3× 38 0.2× 124 0.5× 220 1.3× 27 1.3k
Thorsten Koslowski Germany 18 224 0.5× 89 0.4× 132 0.6× 43 0.2× 270 1.6× 90 1000

Countries citing papers authored by Hajime Okajima

Since Specialization
Citations

This map shows the geographic impact of Hajime Okajima's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Hajime Okajima with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Hajime Okajima more than expected).

Fields of papers citing papers by Hajime Okajima

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Hajime Okajima. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Hajime Okajima. The network helps show where Hajime Okajima may publish in the future.

Co-authorship network of co-authors of Hajime Okajima

This figure shows the co-authorship network connecting the top 25 collaborators of Hajime Okajima. A scholar is included among the top collaborators of Hajime Okajima based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Hajime Okajima. Hajime Okajima is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
1.
Kagi, Hiroyuki, Kazuki Komatsu, Riko Iizuka, et al.. (2024). Hydroxyl group/fluorine disorder in deuterated magnesium hydroxyfluoride and behaviors of hydrogen bonds under high pressure. Journal of Molecular Structure. 1310. 138271–138271.
2.
Sotome, Hikaru, Rintaro Shimada, Hajime Okajima, et al.. (2024). Excited State Dynamics of Geometrical Evolution of α-Substituted Dibenzoylmethanatoboron Difluoride Complex with Aggregation-Induced Emission Property. Journal of the American Chemical Society. 146(47). 32529–32538. 8 indexed citations
3.
Wu, Shu‐Qi, Shinji Kanegawa, Shengqun Su, et al.. (2023). Energy conversion and storage via photoinduced polarization change in non-ferroelectric molecular [CoGa] crystals. Nature Communications. 14(1). 3394–3394. 22 indexed citations
4.
Su, Shengqun, Shu‐Qi Wu, Kaige Gao, et al.. (2022). Photoinduced Persistent Polarization Change in a Spin Transition Crystal. Angewandte Chemie International Edition. 61(39). e202208771–e202208771. 24 indexed citations
5.
Wu, Shu‐Qi, Takumi Nakanishi, Shinji Kanegawa, et al.. (2021). Manipulating electron redistribution to achieve electronic pyroelectricity in molecular [FeCo] crystals. Nature Communications. 12(1). 4836–4836. 34 indexed citations
6.
Wu, Shu‐Qi, Meijiao Liu, Kaige Gao, et al.. (2020). Macroscopic Polarization Change via Electron Transfer in a Valence Tautomeric Cobalt Complex. Nature Communications. 11(1). 1992–1992. 142 indexed citations
7.
Okajima, Hajime, et al.. (2020). Photochromic Radical Complexes That Show Heterolytic Bond Dissociation. Journal of the American Chemical Society. 142(22). 10132–10142. 28 indexed citations
8.
Sotome, Hikaru, Hajime Okajima, Akira Sakamoto, et al.. (2020). Geometrical Evolution and Formation of the Photoproduct in the Cycloreversion Reaction of a Diarylethene Derivative Probed by Vibrational Spectroscopy. ChemPhysChem. 21(14). 1524–1530. 10 indexed citations
9.
Kuramochi, Hikaru, Hajime Okajima, Akira Sakamoto, et al.. (2020). Femtosecond Polarization Switching in the Crystal of a [CrCo] Dinuclear Complex. Angewandte Chemie. 132(37). 15999–16003. 7 indexed citations
10.
Kuramochi, Hikaru, Hajime Okajima, Akira Sakamoto, et al.. (2020). Femtosecond Polarization Switching in the Crystal of a [CrCo] Dinuclear Complex. Angewandte Chemie International Edition. 59(37). 15865–15869. 12 indexed citations
11.
Okajima, Hajime, et al.. (2019). Electrochromism of fast photochromic radical complexes forming light-unresponsive stable colored radical cation. Chemical Communications. 55(34). 4917–4920. 6 indexed citations
12.
Kobayashi, Yoichi, Hajime Okajima, Hikaru Sotome, et al.. (2017). Direct Observation of the Ultrafast Evolution of Open-Shell Biradical in Photochromic Radical Dimer. Journal of the American Chemical Society. 139(18). 6382–6389. 25 indexed citations
13.
Saha, Satyen, et al.. (2017). Microscopic solvation environments in a prototype room-temperature ionic liquid as elucidated by resonance Raman spectroscopy of iodine and bromine. Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy. 176. 79–82. 9 indexed citations
14.
Shimada, Rintaro, Hajime Okajima, Masahiro Ando, et al.. (2016). Automatic and objective oral cancer diagnosis by Raman spectroscopic detection of keratin with multivariate curve resolution analysis. Scientific Reports. 6(1). 20097–20097. 46 indexed citations
15.
Chang, C., Hajime Okajima, Hiro‐o Hamaguchi, & Shinsuke Shigeto. (2014). Imaging molecular crystal polymorphs and their polycrystalline microstructures in situ by ultralow-frequency Raman spectroscopy. Chemical Communications. 50(85). 12973–12976. 15 indexed citations
16.
Korepanov, Vitaly I., Henryk A. Witek, Hajime Okajima, Eiji Ōsawa, & Hiro‐o Hamaguchi. (2014). Communication: Three-dimensional model for phonon confinement in small particles: Quantitative bandshape analysis of size-dependent Raman spectra of nanodiamonds. The Journal of Chemical Physics. 140(4). 41107–41107. 25 indexed citations
17.
Nomoto, Tomonori, Akira Sasahara, Hajime Okajima, et al.. (2013). Phonon mode of TiO2 coupled with the electron transfer from N3 dye. The Journal of Chemical Physics. 138(22). 224704–224704. 4 indexed citations
18.
Iwata, Koichi, Hajime Okajima, Satyen Saha, & Hiro‐o Hamaguchi. (2007). Local Structure Formation in Alkyl-imidazolium-Based Ionic Liquids as Revealed by Linear and Nonlinear Raman Spectroscopy. Accounts of Chemical Research. 40(11). 1174–1181. 227 indexed citations
19.
Okajima, Hajime, et al.. (2002). Fatigue strength CAE system for three‐dimensional welded structures. Fatigue & Fracture of Engineering Materials & Structures. 25(3). 275–282. 2 indexed citations
20.
Okada, Yasunori & Hajime Okajima. (1998). Scavenging Activity of Furan Derivatives against Hydroxyl Radical Generated by Fenton System. YAKUGAKU ZASSHI. 118(6). 226–230. 10 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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