The aminoalkoxide complexes Sr(amak)2 (1) and Ba(amak)2 (2) were prepared by treatment of a multiply-chelating fluorinated aminoalcohol ligand HOC(CF3)2CH2N(CH2CH2OMe)2, (amak)H, with the Group 2 metal reagents Sr(OPri)2 and BaH2 respectively. Single crystal X-ray diffraction studies indicate that complex 1 possesses an 8-coordinate distorted bicapped octahedral geometry with all O and N atoms coordinated to the central Sr cation. However, complex 2 adopts a unique 10-coordinate bicapped square antiprismatic structure, of which the coordination number is increased by two fluorine-to-barium dative interactions. Variable temperature 19F NMR studies show the existence of two inter-convertible isomers in solution and their possible molecular structures are proposed according to their structures in the solid-state. Preliminary investigation suggests that these complexes are good CVD source reagents for depositing SrF2 and BaF2 thin films.
氨基醇盐配合物Sr(amak)2 (1)和Ba(amak)2 (2)是通过多齿
配体氟代
氨基醇HOC(
CF3)2CH2N(CH2CH2OMe)2 (amak)H分别与第II族
金属试剂Sr(OPri)2和
BaH2反应制备得到的。单晶X射线衍射研究表明,配合物1具有八配位畸变的双帽八面体几何构型,所有O和N原子都与中心Sr阳离子配位。然而,配合物2具有独特的十配位双帽反棱柱结构,其中的配位数增加了两个F到Ba的二元配位作用。变温19F NMR研究表明,溶液中存在两种可相互转化的异构体,并根据它们在固态中的结构提出了可能的分子结构。初步研究表明,这些配合物是制备SrF2和
BaF2薄膜的良好的CVD源试剂。