[en] The palladium(II) and platinum(II)complexes(where, (M(L)₂X₂), M=Pd(II), Pt(II); L=isoxazole (isox), 3, 5-dimethylisoxazole(3, 5-diMeisox), 3-methyl, 5-phenylisoxazole(3-Me, 5-Ph-isox), and 4-amino-3, 5-di-methylisoxazole (4-ADI); X=Cl, Br) with isoxazole and its derivatives were investigated on antitumor activity by MM2 and EHMO calculation. Because for all the complexes the σMO energy level (E_σ(M-X) between d_x²_-y² orbital of central metal and p_x orbital of halogen atom is less than σMO energy level E_σ(M-N) between d_x²_-y² orbital of central metal and p_x orbital of N atom, without exception. And judging, from the lower E_σ(M-X) value in trans, the bonding strength was found to be weaker in trans isomer than in cis. For the Pd(II) and Pt(II) complexes which have planar ligands, it was shown that for all the complexes dissociation of X-atom in the Pd(II) complexes is easier than that of X-atom in the Pt(II) complexes in both cis- and trans-complexes. Therefore it suggests that the easier dissociation of X^- ion has some relations with antitumor activity, and a linear equation with correlation coefficient of 0.96 was found between ΔE_σ(N-X)(E_σ(M-N) - E_σ(M-X) ) and inhibitory activity coefficient, logIA

[en] By employing an orthogonal linear-polarization combination, (+45 .deg. ,-45 .deg. ), we prepared a surface relief grating (SRG) and a birefringence grating (BG) on an azo polymer film. Atomic force microscopy (AFM) showed that the SRG height gradually increased, and the height was 56.5 nm at an input fluence of 63 J/cm². All the diffraction orders from the gratings were measured simultaneously, and the BG characteristics were analyzed from the s and the p components of the first-order diffraction beam and the measured SRG height. The BG showed an abrupt increase in the beginning of writing, but decreased shortly later, and became smaller than the SRG at a few minutes after writing. The phase shift between the two gratings was determined to be π, which is crucial for determining the SRG formation mechanism.