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A new coordination polymer [Zn(isop)(bps)]n 1(H2isop=benzene-1,3-dicer-boxylic acid,bps=4,4'-dipyridyl sulfide) has been prepared and structurally characterized by X-ray diffraction method.It crystallizes in monoclinic,space group P21/n with a=12.1936(11),b=10.7720(9),c=13.0685(11),V=1709.0(3)3,C18H12N2O4SZn,Mr=417.76,Z=4,Dc=1.624g/cm3,S=1.046,F(000)=848,the final R=0.0305 and wR=0.0858 for 3085 independent reflections with Rint=0.0147.Single-crystal X-ray diffraction analyses reveal that 1 is a 4-fold interpenetrating diamondoid network.The zinc(Ⅱ) atom is coordinated by two nitrogen atoms of two bps and two carboxylate oxygen atoms of isop ligands,resulting in a tetrahedral geometry. 相似文献
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A planar-integrated optical system(PIOS) represents powerful optical imaging and information processing techniques and is a potential candidate for the realization of a three-dimensional(3D) integrated optoelectronic intelligent system. Coupling the optical wave carrying information into a planar transparent substrate(typically fused silica) is an essential prerequisite for the realization of such a PIOS. Unlike conventional grating couplers for nano-waveguides on the silicon-on-insulator platfo... 相似文献
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建立了一个新颖的用于产生D-脯氨酸的发酵-生物转化过程.发酵过程中,以DL-脯氨酸为发酵前体,类产碱假单胞菌XW-40利用L-对映体诱导产生脯氨酸脱氢酶,D-对映体完全保留.在最优条件下,发酵阶段产生6 g/L D-脯氨酸.生物转化过程中,细胞不经分离,发酵液直接作为反应介质.采用分批补料策略实现DL-脯氨酸中L-对映体的转化.DL-脯氨酸单批补料浓度为10 g/L,补料次数达到5批.通过发酵和生物转化的级联,累积的D-脯氨酸浓度达到31 g/L,ee99%.推测了生物转化过程中D-脯氨酸产生的反应机理. 相似文献
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