凝胶光子晶体*

光子晶体是一种介电常数（或折射率）可以周期性调制的结构,其自激辐射抑制和光子局域化性质使其可以简便而有力的限制、控制和调控光子。近年来,利用胶体晶体自组装性质与水凝胶的传统应用相结合制成的凝胶光子晶体在药物释放、光学开关、金属探针、生物传感器等的新应用方面的研究蓬勃发展,在新材料开发及临床应用等方面取得巨大进展。本文概述了胶体晶体自组装并对该类凝胶光子晶体进行了分类介绍并对其发展趋势进行了评述和展望。     

Silver(I) N-heterocyclic carbene-bridged calix[4]arene analogues as efficient [60]fullerene receptors

Two silver(I) N-heterocyclic carbene-bridged calix[4]arene analogues 4 and 5 were synthesized by a fragment-coupling approach; the preliminary inclusion properties of 5 with [60]fullerene shows that it is a novel efficient [60]fullerene fluorescent sensor.     

单波长光照射下Co（OAc）_2催化溴代烃与CO的羰基化反应

对以Co（OAc）2为催化剂,在3种单波长（254、365、380nm）光照射下,溴代烃与CO的羰基化反应的研究结果表明,以溴代烷烃（溴代环己烷、1-溴己烷、1-溴辛烷）为底物,只有254nm的高能光对羰基化反应是有效的,碱性添加物对反应有明显的促进作用;以溴代环己烷为底物,加入NaOAc,环己基甲酸甲酯的产率可由34...     

Dielectric/piezoelectric properties and temperature dependence of domain structure evolution in lead free single crystal

(K_0.5Na_0.5)NbO₃ (KNN) single crystals were grown using a high temperature flux method. The dielectric permittivity was measured as a function of temperature for [001]-oriented KNN single crystals. The ferroelectric phase transition temperatures, including the rhombohedral–orthorhombic T_R−O, orthorhombic–tetragonal T_O−T and tetragonal–cubic T_C were found to be located at −149  C, 205 C and 393 C, respectively. The domain structure evolution with an increasing temperature in [001]-oriented KNN single crystal was observed using polarized light microscopy (PLM), where three distinguished changes of the domain structures were found to occur at −150  C, 213 C and 400 C, corresponding to the three phase transition temperatures.     

光促进下脂肪酸甲酯的合成及质谱(MS)分析

本文报道了光促进下脂肪酸甲酯合成的新方法,并对１９种甲酯化产物的质谱（ＭＳ）图进行了分析。通过对这些甲酯ＭＳ图的分析,对含两种γ－Ｈ脂肪酸甲酯的Ｍｃｌａｆｆｅｒｔｙ重排进入了深入的探讨,并对同一类型甲酯随碳链增长时重排的规律进行了讨论。     

Ethoxylation of o,p-Nitrochlorobenzene Using Phase Transfer Catalysts by Microwave Irradiation

Microwave irradiation is very efficient to accelerate the rate of ethoxylation of o, p-nitrochlorobenzene. The enhancement of reaction rate is 144–240fold.