Structural studies of mesogenic orthopalladated imine derivatives

  1. Ciriano, M.A. 3
  2. Espinet, P. 2
  3. Lalinde, E. 1
  4. Ros, M.B. 3
  5. Serrano, J.L. 3
  1. 1 Universidad de Zaragoza
    info

    Universidad de Zaragoza

    Zaragoza, España

    ROR https://ror.org/012a91z28

  2. 2 Universidad de Valladolid
    info

    Universidad de Valladolid

    Valladolid, España

    ROR https://ror.org/01fvbaw18

  3. 3 Instituto de Nanociencia y Materiales de Aragón
    info

    Instituto de Nanociencia y Materiales de Aragón

    Zaragoza, España

    ROR https://ror.org/031n2c920

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Journal:
Journal of Molecular Structure

ISSN: 0022-2860

Year of publication: 1989

Volume: 196

Issue: C

Pages: 327-341

Type: Article

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Abstract

Structural studies by 1H NMR of 12 orthopalladated complexes of the type: {Pd2(μ-Y)2(C10H21OC6H4C(X)NC6H4R)2} (XH, CH3; YOCOCH3, Cl, Br, SCN; ROC10H21, C10H21) are reported. Although in all cases only the trans isomers of these complexes have been observed, the presence of other types of isomerism has been detected. Thus, the thiocyanate complexes show isomers arising from the relative disposition of the asymmetrical bridging ligands, whereas the acetato-bridged complexes must be a mixture of the D and L enantiomers due to their rigid open-book shape. From the results of different spectroscopic studies (low temperature and selective decoupling) carried out on the ketone-derived imine complex {Pd2(μ-OCOCH3)2(C10H21OC6H4C(CH3)NC6H4C10H21)2} we suggest that a structural distortion due to steric hindrances exists for this compound. © 1989.