Amide-Functionalized Naphthyridines on a Rh<sup>II</sup>-Rh<sup>II</sup>Platform: Effect of Steric Crowding, Hemilability, and Hydrogen-Bonding Interactions on the Structural Diversity and Catalytic Activity of Dirhodium(II) Complexes
作者:Mithun Sarkar、Prosenjit Daw、Tapas Ghatak、Jitendra K. Bera
DOI:10.1002/chem.201402936
日期:2014.12.8
forms a bridge‐chelate mode in 4. Hydrogen‐bonding interactions between the amide hydrogen and carboxylate oxygen atoms play an important role in the formation of these complexes. In the absence of this hydrogen‐bonding interaction, both ligands bind axially as evident from the X‐ray structure of [Rh2(CH3COO)2(CH3CN)4(L2H)2](BF4)2 (6). However, the axial ligands reorganize at reflux into a bridge‐chelate
二茂铁酰胺官能化的1,8-萘啶(NP)配体[((5,7-二甲基-1,8-萘啶-2--2-基)氨基]羰基}羰基}二茂铁(L 1 H)和[(3-已合成了苯基-1,8-萘啶-2-基)氨基]羰基}二茂铁(L 2 H)。用Rh 2(CH 3 COO)4对两种配体进行室温处理,生成了[Rh 2(CH 3 COO)3(L 1)](1)和[Rh 2(CH 3 COO)3(L 2)]。 (2)为中性络合物,其中配体被去质子化并以三齿方式结合。L 1 H中邻甲基的空间效应和桥接的羧酸酯基团的惰性阻止了第二个配体在Rh II -Rh II }单元上的结合。与L 1 H一起使用更不稳定的Rh 2(CF 3 COO)4盐可产生顺式双加合物[Rh 2(CF 3 COO)4(L 1 H)2 ](3),而产生L 2 H在跨双加合物[Rh 2(CF 3 COO)3(L 2)(L 2 H)](4)。配体L 1 H在3中表现出螯合结合,L