Syntheses,Structure and Thermal Analysis of a Cobalt Coordination Polymer with Multiform Helical Features Based on Flexible Iododicarboxylate Ligand and N-donor Ancillary Ligand

A new 3D complex,[Co（L）（bpe）0.5（H2O）2]n（1,H2 L = 5-iodo-benzene-1,3-dioxyacetic acid,bpe = 1,2-bis（4-pyridyl）ethylene）,has been hydrothermally synthesized and structurally characterized by elemental analysis,IR and X-ray diffraction.It is formulated as C16H16 Co INO8,crystallizes in monoclinic,space group P21/c,with a = 9.806（2）,b = 6.5492（13）,c = 28.187（8） A,β = 100.12（3）°,V = 1782.0（7） A^3,Z = 4,Dc = 1.998 g/m^3,F（000） = 1052,Μr = 536.13,the final R = 0.0393 and w R = 0.0858 for 3134 observed reflections with I 〉 2σ（I）.Complex 1 displays a 3D framework with multiform helical features,left-and right-handed triple helical braids and single helical chains,which can be simplified as a new type of（3,4）-connected lattice with a（6·10^2）（6^2·10^4） SchlAfli symbol.Moreover,the thermal analysis of complex 1 has also been investigated.

渣土改良剂对黏土特性影响的试验研究

针对黏土地层盾构掘进时容易出渣不畅、易堵塞等现象,选取黏土进行渣土改良的试验研究。首先分析黏土试样的液塑限,再研究水、分散剂、聚合物3种改良剂对黏土的流动性和粘附性的影响。通过试验结果分析,流动性相同的情况下,不同的改良剂添加比例不同,间接反映改良剂会影响黏土液限。分散剂水溶液可有效提高黏土的流动性,同时降低粘附性,在黏土地层中具有很好的应用前景。对高液限粘土,需提高改良剂注入比例,为盾构渣土改良系统在黏土地层的配置提供参考。