NOVEL FUNCTIONS OF INTERELEMENT COMPOUNDS

1)通过二硅烷、四硅环己烷合成了具有三个平行的Si-Si键的第14族元素(T.Hiyama，Leader，M.Yokyama)笼状分子的功能。在桥联位置引入了不同的取代基，对三维S共轭进行了光谱论证和计算。由聚硅烷和金生成的胶体在紫外光照射下可氧化分解，是很有前途的光学材料。2)第16族元素(A.Ogawa，T.Nagano)的功能为了合成含有硫、乙烯和苯基团的功能材料，发明了铑催化的乙炔氢硫醇化反应。含有Se-Se或Se-S键的新型化合物显示出对一氧化氮合酶的特定抑制活性，因此在控制各种生理紊乱方面具有很好的应用前景。3)第17族元素(M.Ochiai)的功能具有光学活性的联萘基的高价碘试剂被发明，并被证明对不对称反应非常有效。4)元素作用的理论研究(A.Tchibana)密度泛函理论应用于TiN表面氟腐蚀、GaN表面晶体生长、表面Ga和N原子的吸收以及界面晶体生长机理的研究，在预测难于观察到的现象方面是可靠的。

1) Functions of Group 14 Elements (T.Hiyama, leader, M.Yokoyama)Cage molecules having three Si-Si bonds in parallel were prepared through disilane, tetrasilacyclohexanes. Various substituents were introduced at the bridgehed positions and 3 dimensional s-conjugation was demonstrated spectrometrically and computation. Colloids generated from polysilanes and gold were shown to decompose oxidatively upon UV irradiation and to be promising optical materials.2) Fucntions of Group 16 Elements (A.Ogawa, T.Nagano)For the synthesis of functionality materials containing sulfur, vinylene and phenylene units, rhodium-catalyzed hydrothiolation reaction of acetylenes was invented. Novel compounds containing Se-Se or Se-S bonds were shown to exhibit specific inihibitory activity of NO-synthetase and thus to be promising in control of various physiological disorders.3) Functions of Group 17 Elements (M.Ochiai)Hypervalent iodine reagents having an opticlally active binaphthyl group was invented and shown to be highly effective for asymmetric reactions. In addition, alkynliodinanes were shown to demonstrate potent antifungal acitvity.4) Theoretical Study of Functions of Elements (A.Tachibana)Density Function Theory, as applied to etching of TiN surface with fluorine, crystal growth at GaN surface, absorption of Ga and N atoms at surface, mechanism of interface crystal growth, was shown to be reliable in predicting hard-to-observe phenomena.