Preparation of pyridinium iodide-CdI2 hybrids for nonlinear optical materials

Citation
H. Kosuge et al., Preparation of pyridinium iodide-CdI2 hybrids for nonlinear optical materials, SUPRAMOL CH, 13(1), 2001, pp. 233-245
Citations number
26
Categorie Soggetti
Chemistry
Journal title
SUPRAMOLECULAR CHEMISTRY
ISSN journal
10610278 → ACNP
Volume
13
Issue
1
Year of publication
2001
Pages
233 - 245
Database
ISI
SICI code
1061-0278(2001)13:1<233:POPIHF>2.0.ZU;2-J
Abstract
In order to obtain a new type of organic-inorganic hybrid material for nonl inear optics, two pyridinium-CdI2 crystals, i.e., bis(4-cyano-1-methylpyrid inium) tetraiodocadmate (CNP/CdI4) and bis(4-dimethylamino-1-methylpyridini um) tetraiodocadmeate (DAP/CdI4) were prepared. From X-ray crystal structur e 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 ce ntrosymmetric 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) coe fficients (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.