Preparation of Pyridinium Iodide-CdI2 Hybrids for Nonlinear Optical Materials

Hiroaki Kosuge, Shuji Okada, Hidetoshi Oikawa, Hachiro Nakanishi

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    7 Citations (Scopus)


    In order to obtain a new type of organic-inorganic hybrid material for nonlinear optics, two pyridinium-CdI2 crystals, i.e., bis(4-cyano-1-methylpyridinium) tetraiodocadmate (CNP/CdI4) and bis(4-dimethylamino-1-methylpyridinium) tetraiodocadmeate (DAP/CdI4) were prepared. From X-ray crystal structure analyses, the inorganic parts of both of the crystals are found to be the tetrahedral [CdI4]2- structure. Although the CNP/CdI4 crystals have a centrosymmetric layered structure, the DAP/ CdI4 crystals do not have layered structures resulting in non-centrosymmetric space group Cc and second-order nonlinear optical activity. Thus, the second-harmonic generation (SHG) coefficients (d) of the DAP/CdI4 crystal were estimated using the oriented gas model. In spite of the shorter cutoff wavelength of DAP/CdI4 compared with that of the well-known 2-methyl-4-nitroaniline (MNA) crystal, the maximum d value was expected to reach one-third of that of the MNA in the diagonal component.

    Original languageEnglish
    Pages (from-to)233-245
    Number of pages13
    JournalSupramolecular Chemistry
    Issue number1
    Publication statusPublished - 2001


    • Nonlinear optical material
    • Organic-inorganic hybrid crystal
    • Second-harmonic generation
    • Structure analysis

    ASJC Scopus subject areas

    • Chemistry(all)


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