Determination of 3,3'-dichloro-4,4'-diaminodiphenylmethane in air.

A simple gas chromatographic method is described for the analysis of 3,3'-dichloro-4,4'diaminodiphenylmethane (MOCA) in air. MOCA is quantitatively collected on a Gas-Chrom S tube and the solid sorbent is extracted with acetone. An aliquot sample of the extract is introduced directly into the gas chromatograph, using a microsyringe and the sample is chromatographed on a 1-ft.,silylated 10% Dexsil column. The peak area of MOCA is measured and related to the concentration via a calibration curve prepared with a constant volume of standards. The chloroanilines associated with MOCA cause no interference; however, interference can be expected from any compounds having a retention time identical to that of MOCA. As little as 0.002 mug of MOCA per mul of acetone can be detected by this method.     

Features of the Crystal Structure of the Polyimide Derived from 3,3'-Diaminobenzophenone and 3,3',4,4'-Benzophenonetetracarboxylic Dianhydride

Changes occurring in the structural organization of the thermoplastic polyimide derived from 3,3'-diaminobenzophenone and 3,3',4,4'-benzophenonetetracarboxylic dianhydride on heat treatment at temperatures in the range 250-350°C were studied, and the influence of these changes on the rheological behavior of the polymer was examined.     

基于3，3′，4，4′-四羧基偶氮苯构筑的三个金属配合物的合成、晶体结构及性质

在水热条件下利用H₄ddb配体合成了3个过渡金属配合物[Co₂（ddb）（phen）₂（H₂O）₆]·3H₂O（1）,[Co（ddb）_0.5（bpy）_0.5（H₂O）₃]_n（2）和{[Ag（dpe）]·0.5（H₂ddb）·H₂O}_n（3）（H₄ddb=3,3'',4,4''-四羧基偶氮苯,bpy=4,4''-联吡啶,dpe=1,2-二（4-吡啶基乙烯））,并用元素分析、红外光谱、X射线粉末衍射、X射线单晶衍射对其进行了表征。配合物1为双核结构,基于丰富的氢键作用扩展形成三维超分子网结构。配合物2为基于钴离子通过ddb^4-配体以μ₄：η¹,η¹,η¹,η¹的配位模式连接而成的二维网结构。配合物3是由Ag（Ⅰ）离子与dpe配体形成的直链结构,客体分子H₂ddb^2-通过氢键作用将其扩展为三维超分子结构。此外还研究了配合物1~3的荧光性质和热稳定性。     

基于3,3′,5,5′-(1,3-苯基)-联苯四羧酸构筑的两个配位聚合物的合成、晶体结构和荧光性质(英文)

以3,3′,5,5′-(1,3-苯基)-联苯四羧酸(H4btb)与1,10-菲咯啉(phen)为配体,分别与硝酸镉和硝酸锌在水热条件下反应合成2个一维[Cd(H2btb)(phen)]n(1)和二维{[Zn2(btb)(phen)]·1.5H2O}n(2)配位聚合物,并对其进行了元素分析、红外光谱、热重分析和X-射线单晶衍射测定。配合物1属于单斜晶系,空间群为C2/c,晶胞参数:a=2.82845(13)nm,b=1.08554(5)nm,c=1.81768(8)nm,β=96.4850(10)°,V=5.5453(4)nm3,Z=8,Dc=1.670Mg·m-3,F(000)=2800,R1=0.0339,wR2=0.0718[I2σ(I)],配体H4btb的2个羧基分别采取μ1-η1∶η1、μ2-η2∶η1配位模式连接镉原子形成一维带状结构。化合物2也属于单斜晶系,空间群为P21/c,晶胞参数:a=1.7471(3)nm,b=1.2511(2)nm,c=2.1870(3)nm,β=120.911(11)°,V=4.1014(11)nm3,Z=4,Dc=1.491Mg·m-3,F(000)=1876,R1=0.0673,wR2=0.1749[I2σ(I)],全部去质子的H4btb配体的4个羧基分别采取μ1-η1∶η0、μ1-η1∶η1、μ2-η1∶η1配位模式连接锌原子形成一维链,链间通过μ2-η1∶η1桥连羧基扩展为(3,5)-连接的二维(42·67·8)(42·6)网状结构。同时研究了2个配合物的荧光性质。