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Highly efficient chirality transfer from diamines encapsulated within a self-assembled calixarene-salen host

  • Datos identificativos

    Identificador: PC:1191
    Autores:
    Carles BoLuis Martínez-RodríguezNuno A. G. BandeiraArjan W. Kleij
    Resumen:
    A calix[4]arene host equipped with two bis-[Zn(salphen)] complexes self-assembles into a capsular complex in the presence of a chiral diamine guest with an unexpected 2:1 ratio between the host and the guest. Effective chirality transfer from the diamine to the calix-salen hybrid host is observed by circular dichroism (CD) spectroscopy, and a high stability constant K2,1 of 1.59×1011 M-2 for the assembled host-guest ensemble has been determined with a substantial cooperativity factor α of 6.4. Density functional calculations are used to investigate the origin of the stability of the host-guest system and the experimental CD spectrum compared with those calculated for both possible diastereoisomers showing that the M,M isomer is the one that is preferentially formed. The current system holds promise for the chirality determination of diamines, as evidenced by the investigated substrate scope and the linear relationship between the ee of the diamine and the amplitude of the observed Cotton effects. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
  • Otros:

    Autor según el artículo: Carles Bo Luis Martínez-Rodríguez Nuno A. G. Bandeira Arjan W. Kleij
    Departamento: Química Física i Inorgànica
    Autor/es de la URV: BO JANÉ, CARLES Luis Martínez-Rodríguez Nuno A. G. Bandeira Arjan W. Kleij
    Palabras clave: Calixarenes chirality transfer encapsulation
    Resumen: A calix[4]arene host equipped with two bis-[Zn(salphen)] complexes self-assembles into a capsular complex in the presence of a chiral diamine guest with an unexpected 2:1 ratio between the host and the guest. Effective chirality transfer from the diamine to the calix-salen hybrid host is observed by circular dichroism (CD) spectroscopy, and a high stability constant K2,1 of 1.59×1011 M-2 for the assembled host-guest ensemble has been determined with a substantial cooperativity factor α of 6.4. Density functional calculations are used to investigate the origin of the stability of the host-guest system and the experimental CD spectrum compared with those calculated for both possible diastereoisomers showing that the M,M isomer is the one that is preferentially formed. The current system holds promise for the chirality determination of diamines, as evidenced by the investigated substrate scope and the linear relationship between the ee of the diamine and the amplitude of the observed Cotton effects. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
    Áreas temáticas: Química Química Chemistry
    ISSN: 0947-6539
    Identificador del autor: 0000-0001-9581-2922 n/a 0000-0002-5754-7328 0000-0002-7402-4764
    Fecha de alta del registro: 2015-08-04
    Página final: 7150
    Volumen de revista: 21
    Versión del articulo depositado: info:eu-repo/semantics/acceptedVersion
    Enlace a la fuente original: http://onlinelibrary.wiley.com/doi/10.1002/chem.201500333/full
    URL Documento de licencia: https://repositori.urv.cat/ca/proteccio-de-dades/
    DOI del artículo: 10.1002/chem.201500333
    Entidad: Universitat Rovira i Virgili
    Año de publicación de la revista: 2015
    Página inicial: 7144
    Tipo de publicación: Article Artículo Article
  • Palabras clave:

    Quiralitat
    Calixarens
    Calixarenes
    chirality transfer
    encapsulation
    Química
    Química
    Chemistry
    0947-6539
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