A series of bis(alkynyl) Ru2(DMBA)4 (DMBA = N,N′-dimethylbenzamidinate) compounds bearing extended, acyclic, cross-conjugated frameworks (number of acetylene units ≥ 3), namely Ru2(DMBA)4(L1SiiPr3)2 (1a, see Scheme 1 for the definition of L1 and L2) and Ru2(DMBA)4(L2SiiPr3)2 (2a), were prepared under aerobic, weak base conditions in good yields. Compounds 1a and 2a showed moderate stability and underwent
一系列带有扩展的,无环的,交叉共轭骨架(
乙炔单元≥3的
乙炔)的双(炔基)Ru 2(
DMBA)4(
DMBA = N,N'-二甲基苯甲酰胺)化合物,即Ru 2(
DMBA)4(L1 Si i Pr 3)2(1a,有关L1和
L2的定义,请参见方案1 )和Ru 2(
DMBA)4(
L2 Si i Pr 3)在有氧,弱碱条件下以高收率制备了2(2a)。在游离
乙炔基化合物Ru 2(
DMBA)4(L1 H)2(1b)和Ru 2(
DMBA)4(
L2)上添加(n-Bu)4 NF有助于化合物1a和2a的稳定化并进行丙二
硅烷化H)2(2b)分别。对1a的X射线结构研究表明,与理想化的D 4h明显不同Ru 2核的配位球的几何形状,以及迄今为止报道的最短的Ru- Cα键之一。电子吸收光谱测量表明,化合物1a和1b的HOMO-LUMO间隙较小(约1.38 eV),而2a和2b的间隙(约1.40 eV)更接近典型Ru 2(
DMBA)4的范围。(C