Conjugated metallorganic macrocycles: opportunities for coordination-driven planarization of bidentate, pyridine-based ligands
作者:Danielle C. Hamm、Lindsey A. Braun、Alex N. Burazin、Amanda M. Gauthier、Kendra O. Ness、Casey E. Biebel、Jon S. Sauer、Robin Tanke、Bruce C. Noll、Eric Bosch、Nathan P. Bowling
DOI:10.1039/c2dt31914d
日期:——
Two conjugated systems that can be constrained to planarity via metal coordination have been generated and their metal complexes studied. The potential for these architectures to be incorporated into metal-sensing arylene ethynylene/vinylene oligomers and polymers was probed by verifying that these ligands (1) bind strongly to Ag(I) and Pd(II) cations, and (2) that this event leads to complexes that are planar. Single crystal structures confirm that introduction of Ag(I) or Pd(II) cations enforces planarity in the newly formed macrocycles. Likewise, 1H-NMR titration studies reveal stoichiometric binding of Pd(II) and strong binding of Ag(I) (Ka (Ligand 1) = 1.3 × 102 M−1; Ka (Ligand 2) = 5.4 × 102 M−1) for each conjugated ligand.
我们生成了两种可通过金属配位限制平面性的共轭体系,并对其金属配合物进行了研究。通过验证这些配体(1) 与 Ag(I) 和 Pd(II) 阳离子的强结合,以及(2) 这种结合导致的配合物为平面配合物,探究了将这些结构纳入金属传感芳基乙炔/乙烯低聚物和聚合物的可能性。单晶结构证实,Ag(I) 或 Pd(II) 阳离子的引入加强了新形成的大环的平面性。同样,1H-NMR 滴定研究显示,对于每种共轭配体,Pd(II) 和 Ag(I) 的结合达到了等比例(Ka(配体 1)= 1.3 × 102 M-1;Ka(配体 2)= 5.4 × 102 M-1)。