碱土金属与DBC-偶氮氯膦配位反应及配合物结构的研究

本文研究了DBC-偶氮氯膦在不同酸度下的存在形式、质子化情况及反应中的质子释放情况, 测定了钙、锶、钡与其形成的配合物的稳定常数。利用红外、激光Raman、核磁共振光谱等对所生成的配合物的结构进行了研究, 并根据实验结果和分子结构的几咱理论, 提出了碱土金属与其生成的配合物的结构。本文还就配位反应和配合物的成键情况进行了讨论。

Studies on the reactio and structure of the complexes of alkaline earth metal with chlorophosphonazo-DBC

The reaction and structure of the complexes of alkaline earth metals (Ca, Sr, Ba) with 2-(4'-chloro-2'-phosphonazo)-7-(2',6'-dibromo-4'-chlorophenylazo) 1,8-dihydroxy-3, 6-naphthalene disulfonic acid (Chlorophosphonazo-DBC) were studied. This ligand has eight forms under different acidity. The protonation reactions take place at H+] > 0.36 mol/dm3. The ligand begins dissocns. at pH > 0.5. Two protons are released in the complexes formation reactions (M2+ + 2HI t ML2 + 2H+). The stability constants of the complexes of Ca, Sr, and Ba were determine by Yoe-Jone method, Majumder-Chakrabertty method and calculation method. The order of the stability of complexes is as follows: Sr > Ba > Ca. The structure of the complexes was also studied by IR spectroscopy, Laser Raman spectroscopy, NMR, and EPR. The results show that these groups of N=N, PO3H2 and OH are active groups in the complex reactions. The structure of the complexes of Sr, Ba, and Ca with chlorophosphonazo-DBC are represented and the reaction and the complex bonds are discussed.