一种含阻转异构体的二羧酸铀(Ⅵ)有机-金属配合物

Uranium(Ⅵ) complex [UO₂((R，S)-1，1′-binaphthylene-2，2′-dicarboxylate)(H₂O)] was obtained by the hydrothermal treatment of UO₂(NO₃)₂·6H₂O with (R，S)-1，1′-binaphthylene-2，2′-dicarboxylic acid(BCA) (L) in water at 180 ℃ in Pyrex tube. The crystal belongs to monoclinic system， space group C2/c， with a=1.640 3(3) nm， b=1.196 7(2) nm， c=1.066 3(17) nm， β=104.412(4)°， V=2.027 2(6) nm³， Z=4. CCDC: 659617.     

DBBD及其Cu(Ⅰ)配位聚合物[CuI(DBBD)2]n的合成

In this article we report the synthesis of (R,S)-4,4'-biquinoline-6,6'-dimethyl-3,3'-dicarboxylate (DBBD)(1) and the formation of copper(Ⅰ) coordination polymer [CuI(DBBD)2]n (2) by inducing a bidentate organic ligand (DBBD). The crystal 1 belongs to monoclinic system with space group P21, and a=0.881 30(19) nm, b=1.9660(6)system with space group Fmm2, and a=2.04441 (17) nm, b=1.543 06 (13) nm, c=1.65245 (13) nm, V=5.2129(7)     

Synthesis and Crystal Structure of a Novel Hydrogen-Bonded Three-Dimensional Polymer [Zn(1,4-benzenedicarboxylate)-(pyridine)·H_2O]_n

ＩｎｔｒｏｄｕｃｔｉｏｎＤｅｓｉｇｎａｎｄｓｙｎｔｈｅｓｅｓｏｆｎｏｖｅｌｓｕｐｒａｍｏｌｅｃｕｌａｒｃｏｍ ｐｌｅｘｅｓｗｉｔｈｕｎｕｓｕａｌａｎｄｔａｉｌｏｒａｂｌｅｓｔｒｕｃｔｕｒｅｓａｒｅｆｕｎｄａ ｍｅｎｔａｌｓｔｅｐｓｉｎｄｉｓｃｏｖｅｒｙａｎｄｆａｂｒｉｃａｔｉｏｎｏｆｖａｒｉｏｕｓｔｅｃｈ ｎｏｌｏｇｉｃａｌｌｙｕｓｅｆｕｌｆｕｎｃｔｉｏｎａｌｓｕｐｒａｍｏｌｅｃｕｌａｒｄｅｖｉｃｅｓ .1 3Ｒｅｃｅｎｔｌｙ ,ｃｏｎｓｉｄｅｒａｂｌｅｅｆｆｏｒｔｓｈａｖｅｂｅｅｎｄｅｖｏｔｅｄｔｏｃｒ…     

A Cadmium(II) Coordination Polymer:Crystal Structure and Fluorescent Property of [CdCl2(4,4''-bipyridine)]∞

The reaction of L-histidine,CdCl2(2.5H2O and 4,4'-bipyridine in methane/water gave rise to a two-dimensional coordination polymer [CdCl2(4,4'-bipyridine)]( which has been characterized by single-crystal X-ray diffraction.The polymer crystallizes in the orthorhombic sys-tem,space group Cmmm with a = 12.083(7),b = 11.771(7),c = 3.781(2)(A),V = 537.8(6)(A)3,Z = 2,C10H8N2CdCl2,Mr = 339.48,Dc = 2.097 g/cm3,F(000) = 328 and μ(MoKα) = 2.490 mm-1.The final R = 0.0658 and wR = 0.1398 for 257 observed reflections with I≥2σ(I).     

Synthesis and Crystal Structure ofa Seven—coordinate Cadmium（Ⅱ）Complex

1 INTRODUCTION In the last decade, there has been great interest in the crystal engineering of supramolecular architectures organized by coordinate covalent bonds, hydrogen bonds and their combination owing to their fascinating structural diversity and potential applications as functional materials[1~3]. The self-assembly of coordinate polymers and supramolecules is highly influenced by factors such as ligands, metal ions, the counter ions, solvent, template, reaction temperature, pH va…     

22SiMn2TiB装甲钢激光切割试验研究

针对切割后的板料表侧面质量差,拼焊时因两板间隙产生挂渣、过烧和熔滴等问题,对5mm厚的22SiMn2TiB装甲钢进行了激光切割实验研究,讨论了激光功率、切割速度、离焦量、喷嘴孔径和辅助气体压力等5个工艺参数对切割后板料表侧面质量影响的规律。实验结果表明:激光切割22SiMn2TiB装甲钢时,调整上述5个工艺参数在合理范围内时,未产生挂渣、过烧和熔滴等缺陷。最后通过工艺优化得到了激光切割22SiMn2TiB装甲钢最佳工艺参数为切割速度2 000mm/min、激光功率2 200 W、离焦量1mm、喷嘴孔径1.5mm、辅助气体压力0.15 MPa。     

颜色量化——色彩退化算法

颜色量化是利用人眼对颜色的惰性,将原图像中不太重要的相似颜色合并为一种颜色,减少图像中的颜色,而使量化前后的图像对于人眼的认识误差最小即量化误差最小。在此从揭示八叉树颜色量化算法的优缺点开始,优化八叉树结构,进化为以二叉堆和数组索引数据结构,对最不重要颜色不断地进行退化,最终达到量化要求的颜色数量。实践证明,在相同情况下,二叉堆比八叉树颜色量化对图像的量化误差更小。     

顺畅使用“共享”资源

局域网内同事们经常要使用“共享”这个功能,以达到信息沟通与交换的目的。以前,每当同事们说电脑上的资料无法共享或者共享了无法打开的时候,我就发秫,觉得不知道从什么地方下手去解决。后来经过一段时间的摸索,逐渐找到了一些解决办法,现写出来供大家参考。     

在线式三进三出交流变频不间断电源的设计

针对传统UPS(不间断电源)的局限性,提出了一种用DSP芯片TMS320F240实现的变频UPS电源,介绍了其工作原理及系统硬件设计.变频UPS具备传统UPS和变频器的双重功能,适用于交流异步电动机负载的特种工业应用电源.对于不允许停电的电动机负载,选择这种变频UPS比选择普通UPS具有更高的性价比.