Herein, we describe the preparation of several dynamic multicomponent supramolecularracks based on copperphenanthroline complexes using the HETPHEN concept (heteroleptic bisphenanthroline complexes). This approach employs bulky aryl substituents at the bisimine coordination sites to control the coordination equilibrium. The racks were characterised by spectroscopic methods, both in solution (1H NMR
Dynamic and Fluorescent Nanoscale Phenanthroline/Terpyridine Zinc(II) Ladders. Self-Recognition in <i>Unlike</i> Ligand/<i>Like</i> Metal Coordination Scenarios
作者:Michael Schmittel、Venkateshwarlu Kalsani、Ravuri S. K. Kishore、Helmut Cölfen、Jan W. Bats
DOI:10.1021/ja0525096
日期:2005.8.24
A new coordination kit, the HETTAP approach, is described, which allows one to prepare supramolecular heteroleptic metal phenanthroline/terpyridine racks and ladders in basically quantitative yield. Due to the dynamicnature of the nanoladder structures, a two-step double-transmetalation and scenarios with like metal/unlike ligand recognition were realized.
Metal-Driven and Covalent Synthesis of Supramolecular Grids from Racks: A Convergent Approach to Heterometallic and Heteroleptic Nanostructures
作者:Michael Schmittel、Venkateshwarlu Kalsani、Jan W. Bats
DOI:10.1021/ic050088n
日期:2005.6.1
Supramolecular nanogrids were prepared from dynamic supramolecular racks through the coupling of terminal alkynes using either a covalent (with CuCl/O-2) or a coordinative (with [trans-(PEt3)(2)PtCl2]) approach. Because of the rapid equilibration of the racks (as tested by exchange reactions), oligomeric adducts potentially formed in the coupling process will selectively furnish the nanogrids through an entropically driven self-repair mechanism. To ascertain the structural assignment, the nanogrids were also synthesized by an independent strategy.