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  1. Article ; Online: H/D solvent isotope effects on the photoracemization reaction of enantiomeric the tris(2,2'-bipyridine)ruthenium(ii) complex and its analogues.

    Asahara, Masahiro / Kurimoto, Haruhiko / Nakamizu, Masato / Hattori, Shingo / Shinozaki, Kazuteru

    Physical chemistry chemical physics : PCCP

    2020  Volume 22, Issue 11, Page(s) 6361–6369

    Abstract: This work assessed solvent isotope effects on the photoracemization rate and emission lifetime for [Ru(bpy)3]2+ (bpy = 2,2'-bipyridine) in water. An analysis of the effects of temperature on photoracemization rate and emission lifetime demonstrated that ... ...

    Abstract This work assessed solvent isotope effects on the photoracemization rate and emission lifetime for [Ru(bpy)3]2+ (bpy = 2,2'-bipyridine) in water. An analysis of the effects of temperature on photoracemization rate and emission lifetime demonstrated that the transition from one enantiomer to the other is unaffected by the isotopic composition of the solvent. The results also showed that deactivation from the metal-to-ligand charge-transfer (3MLCT) excited state to the ground state is responsible for the solvent isotope effect on the photoracemization rate. The photoracemization reaction was found to proceed via a bond-breaking mechanism. In this process, a five-coordinated species produced through breaking of the Ru-N bond in the 3d-d* state undergoes a structural change to produce an achiral five-coordinated species. An analysis of the effect of temperature on emission lifetime, excluding the activation to the 3d-d* state that leads to the structural change, showed that the solvent isotopic composition affects deactivation from the 4th MLCT state.
    Language English
    Publishing date 2020-01-17
    Publishing country England
    Document type Journal Article
    ZDB-ID 1476244-4
    ISSN 1463-9084 ; 1463-9076
    ISSN (online) 1463-9084
    ISSN 1463-9076
    DOI 10.1039/c9cp06758b
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Fungal melanin inhibitor and related compounds from Penicillium decumbens.

    Fujii, Yuzo / Asahara, Masahiro / Ichinoe, Masakatsu / Nakajima, Hiromitsu

    Phytochemistry

    2002  Volume 60, Issue 7, Page(s) 703–708

    Abstract: Two polyketides, decumbenones A and B, and versiol were isolated from the culture filtrate of the fungus, Penicillium decumbens. Their respective structures were 1-(2,8-dihydroxy-1,2,6-trimethyl-1,2,6,7,8,8a-hexahydronaphthalen-1-yl)-3-hydroxy-1- ... ...

    Abstract Two polyketides, decumbenones A and B, and versiol were isolated from the culture filtrate of the fungus, Penicillium decumbens. Their respective structures were 1-(2,8-dihydroxy-1,2,6-trimethyl-1,2,6,7,8,8a-hexahydronaphthalen-1-yl)-3-hydroxy-1-propanone and 1-(2,8-dihydroxy-1,2,6-trimethyl-1,2,4a,5,6,7,8,8a-octahydronaphthalen-1-yl)-3-hydroxy-1-propanone based on NMR spectroscopic data, chemical conversion, and X-ray analysis. Decumbenone A inhibited melanization in Magnaporthe grisea, the rice blast pathogen, whereas decumbenone B like versiol did not.
    MeSH term(s) Crystallography, X-Ray ; Heterocyclic Compounds, 3-Ring/chemistry ; Heterocyclic Compounds, 3-Ring/isolation & purification ; Ketones/chemistry ; Ketones/isolation & purification ; Melanins/antagonists & inhibitors ; Molecular Structure ; Naphthalenes/chemistry ; Naphthalenes/isolation & purification ; Penicillium/chemistry
    Chemical Substances Heterocyclic Compounds, 3-Ring ; Ketones ; Melanins ; Naphthalenes ; decumbenone A ; decumbenone B ; versiol (50TPF0MD67)
    Language English
    Publishing date 2002-07-01
    Publishing country England
    Document type Journal Article
    ZDB-ID 208884-8
    ISSN 1873-3700 ; 0031-9422
    ISSN (online) 1873-3700
    ISSN 0031-9422
    DOI 10.1016/s0031-9422(02)00196-6
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Protected Vicinal Diol Controller in Diastereoselective Reduction of ß-Oxo Esters

    Saito, Seiki / Harunari, Takeshi / Shimamura, Nobuhiro / Asahara, Masahiro / Moriwake, Toshio

    Synlett

    1992  Volume 1992, Issue 04, Page(s) 325–327

    Language English
    Publishing date 1992-01-01
    Publishing place Stuttgart ; New York
    Document type Article
    ZDB-ID 2042012-2
    ISSN 1437-2096 ; 0936-5214
    ISSN (online) 1437-2096
    ISSN 0936-5214
    DOI 10.1055/s-1992-22001
    Database Thieme publisher's database

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