Tahir Asif A, Molloy Kieran C, Mazhar Muhammad, Kociok-Köhn Gabriele, Hamid Mazhar, Dastgir Sarim
Department of Chemistry, Quaid-I-Azam University, Islamabad 45320, Pakistan.
Inorg Chem. 2005 Dec 12;44(25):9207-12. doi: 10.1021/ic050564+.
Ba(dmae)2 (dmaeH=N,N-dimethylaminoethanol, C4H11NO) reacts with Co(acac)2 (acac=2,4-pentanedionate) to produce the trinuclear coordination complex [Ba2Co(acac)4(dmae)3(dmaeH)] in an 85% yield. Spectroscopic and single-crystal X-ray diffraction experiments indicate that the complex possesses a structure in which two barium atoms and a cobalt atom are bridged by acac and dmae groups. The barium centers are eight and nine coordinate with BaO7N and BaO7N2 coordination spheres while the cobalt is a more regular CoO5N octahedron. This 2:1 heterobimetallic molecular complex was investigated as precursor for the deposition of thin film by AACVD. The film was characterized by SEM and XRD. TGA shows that the complex starts thermal decomposition upon heating in nitrogen atmosphere at 105 degrees C to produce barium cobalt oxide material of a Ba2CoO3 composition with an orthorhombic structure. The synthetic approach detailed here represents a unique route to the formation of a heterobimetallic barium cobalt coordination complex.
二（二甲基氨基乙醇）钡（dmaeH = N，N - 二甲基氨基乙醇，C4H11NO）与乙酰丙酮钴（II）（acac = 2,4 - 戊二酮）反应，以85%的产率生成三核配位络合物[Ba2Co(acac)4(dmae)3(dmaeH)]。光谱和单晶X射线衍射实验表明，该络合物具有一种结构，其中两个钡原子和一个钴原子通过乙酰丙酮基团和二甲基氨基乙醇基团桥连。钡中心分别以BaO7N和BaO7N2配位球进行八配位和九配位，而钴则是一个更规则的CoO5N八面体。研究了这种2:1异双金属分子络合物作为通过原子层化学气相沉积（AACVD）制备薄膜的前驱体。通过扫描电子显微镜（SEM）和X射线衍射（XRD）对薄膜进行了表征。热重分析（TGA）表明，该络合物在氮气气氛中于105℃加热时开始热分解，生成具有正交结构的Ba2CoO3组成的钡钴氧化物材料。这里详细描述的合成方法代表了一种形成异双金属钡钴配位络合物的独特途径。
