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Chemistry

D-Index
52
Citations
8156
World Ranking
13676
National Ranking
1054

Overview

Yasushi Koyama is affiliated with Kwansei Gakuin University in Japan and is primarily engaged in research within the fields of Materials Science and Chemistry. Their work has contributed notably to several subfields, including Materials Chemistry, Inorganic Chemistry, Electronic, Optical and Magnetic Materials, Oncology, and Organic Chemistry.

The primary research topics of Yasushi Koyama cover a range of subjects related to crystallography and chemical compound analysis. These include:

  • Crystallization and Solubility Studies
  • X-ray Diffraction in Crystallography
  • Metal complexes synthesis and properties
  • Magnetism in coordination complexes
  • Metal-Catalyzed Oxygenation Mechanisms
  • Crystal structures of chemical compounds
  • Molecular spectroscopy and chirality

Koyama has collaborated extensively with co-authors such as Ryoji Mitsuhashi, Masahiro Mikuriya, Motohiro Tsuboi, Daisuke Yoshioka, and Sayuri Ono, reflecting a diverse network of academic partnerships.

Their recent publications include:

  • "Detailed magnetic analysis and successful deep-neural-network-based conformational prediction for [VO(dmso)5][BPh4]2" (2020), published in RSC Advances
  • "Crystal Structure of S8 Molecule from Thiourea" (2020), published in X-ray Structure Analysis Online
  • "Crystal Structure of 1,3-Bis(3,5-dibromosalicylideneamino)-2-propanol" (2022), published in X-ray Structure Analysis Online
  • "Crystal Structure of a Hydrolyzed Product of the Cobalt(III) Complex with 1-(3,5-Dichlorosalicylideneamino)-3-amino-2-propanol" (2022), published in X-ray Structure Analysis Online
  • "Preparation and Crystal Structure of Sodium Tetraperoxidochromate(V)" (2020), published in X-ray Structure Analysis Online

Koyama's publications often appear in specialized academic venues such as The Cambridge Structural Database and X-ray Structure Analysis Online, with additional contributions in journals like RSC Advances and the Journal of the Japanese Society of Revegetation Technology. The volume of publications reflects consistent research activity in these areas.

Best Publications

  • Singlet Excited States and the Light‐Harvesting Function of Carotenoids in Bacterial Photosynthesis

    Yasushi Koyama;Michitaka Kuki;Per Ola Andersson;Tomas Gillbro

  • Efficient light harvesting through carotenoids.

    Thorsten Ritz;Ana Damjanović;Klaus J Schulten;Jian Ping Zhang

  • Raman and infrared spectra of the all-trans, 7-cis, 9-cis, 13-cis and 15-cis isomers of β-carotene: Key bands distinguishing stretched or terminal-bent configurations form central-bent configurations

    Yasushi Koyama;Ichiro Takatsuka;Munetaka Nakata;Mitsuo Tasumi

  • The 1Bu+, 1Bu-, and 2Ag- Energies of Crystalline Lycopene, β-Carotene, and Mini-9-β-carotene as Determined by Resonance-Raman Excitation Profiles: Dependence of the 1Bu- State Energy on the Conjugation Length

    Tokutake Sashima and;Yasushi Koyama;Takashi Yamada and;Hideki Hashimoto

  • Separation and determination of cis/trans-β-carotenes by high-performance liquid chromatography

    Kiyoshi Tsukida;Kayoko Saiki;Tomoko Takii;Yasushi Koyama

  • Configuration of the carotenoid in the reaction centers of photosynthetic bacteria. Comparison of the resonance Raman spectrum of the reaction center of Rhodopseudomonas sphaeroides G1C with those of cis-trans isomers of β-carotene

    Yasushi Koyama;Mariko Kito;Tomoko Takii;Kayoko Saiki

  • Mechanism of the Carotenoid-to-Bacteriochlorophyll Energy Transfer via the S1 State in the LH2 Complexes from Purple Bacteria

    † Jian-Ping Zhang;Ritsuko Fujii;Pu Qian;Toru Inaba

  • A new singlet-excited state of all-trans-spheroidene as detected by resonance-Raman excitation profiles

    Tokutake Sashima;Hiroyoshi Nagae;Michitaka Kuki;Yasushi Koyama

  • The CC stretching Raman lines of [β-carotene isomers in the S1 state as detected by pump-probe resonance Raman spectroscopy

    Hideki Hashimoto;Yasushi Koyama

  • The first detection of the 3A g - state in carotenoids using resonance-Raman excitation profiles

    Kentaro Furuichi;Tokutake Sashima;Yasushi Koyama

  • Triplet-sensitized and thermal isomerization of all-trans, 7-cis, 9-cis, 13-cis and 15-cis isomers of .beta.-carotene: configurational dependence of the quantum yield of isomerization via the T1 state

    Michitaka Kuki;Yasushi Koyama;Hiroyoshi Nagae

  • Structure of the light-harvesting bacteriochlorophyll c assembly in chlorosomes from Chlorobium limicola determined by solid-state NMR

    Ayako Egawa;Toshimichi Fujiwara;Tadashi Mizoguchi;Yoshinori Kakitani

  • Raman spectra of chlorophyll forms

    Yasushi Koyama;Yasuhiro Umemoto;Atsuko Akamatsu;Kaku Uehara

  • Effect of protonation on the isomerization properties of n-butylamine Schiff base of isomeric retinal as revealed by direct HPLC analyses: selection of isomerization pathways by retinal proteins.

    Yasushi Koyama;Keishi Kubo;Mika Komori;Haruo Yasuda

  • The 2Ag− energies of all-trans-neurosporene and spheroidene as determined by fluorescence spectroscopy

    Ritsuko Fujii;Kengo Onaka;Michitaka Kuki;Yasushi Koyama

  • Dye-sensitized solar cells using a chlorophyll a derivative as the sensitizer and carotenoids having different conjugation lengths as redox spacers

    Xiao-Feng Wang;Junfeng Xiang;Peng Wang;Yasushi Koyama

  • Near-infrared time-resolved study of the S-1 state dynamics of the carotenoid spheroidene

    Tornáš Polívka;Donatas Zigmantas;Harry A. Frank;James A. Bautista

  • Vibronic Coupling through the In-Phase, CC Stretching Mode Plays a Major Role in the 2Ag- to 1Ag- Internal Conversion of all-trans-β-Carotene

    Hiroyoshi Nagae;Michitaka Kuki;Jian-Ping Zhang;Tokutake Sashima

  • Effects of plant carotenoid spacers on the performance of a dye-sensitized solar cell using a chlorophyll derivative: Enhancement of photocurrent determined by one electron-oxidation potential of each carotenoid

    Xiao-Feng Wang;Arihiro Matsuda;Yasushi Koyama;Hiroyoshi Nagae

  • S1 and T1 species of .beta.-carotene generated by direct photoexcitation from the all-trans, 9-cis, 13-cis, and 15-cis isomers as revealed by picosecond transient absorption and transient Raman spectroscopies

    Hideki Hashimoto;Yasushi Koyama;Yoshinori Hirata;Noboru Mataga

Frequent Co-Authors

Hideki Hashimoto
Hideki Hashimoto Kwansei Gakuin University
Xiao-Feng Wang
Xiao-Feng Wang Jilin University
Richard J. Cogdell
Richard J. Cogdell University of Glasgow
Hugo Scheer
Hugo Scheer Ludwig-Maximilians-Universität München
Yuji Wada
Yuji Wada Tokyo Institute of Technology
Hideki Hashimoto
Hideki Hashimoto Chuo University
Hitoshi Tamiaki
Hitoshi Tamiaki Ritsumeikan University
Tatsuya Tomo
Tatsuya Tomo Tokyo University of Science
Fuyuhiko Inagaki
Fuyuhiko Inagaki Hokkaido University
Leif H. Skibsted
Leif H. Skibsted University of Copenhagen

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