Related Experiment Video
Updated: Feb 2, 2026

Protocol for Biofilm Streamer Formation in a Microfluidic Device with Micro-pillars
Published on: August 20, 2014
Restricting shuttling in bis(imidazolium)…pillar[5]arene rotaxanes using metal coordination
Philipp Langer1, Lixu Yang, Constance R Pfeiffer
1School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, UK. Neil.Champness@nottingham.ac.uk.
Abstract:
Metal coordination to a series of bis (imidazolium)…pillar[5]arene [2]rotaxanes through the formation of metal-carbene bonds facilitates a new strategy to restrict the shuttling motion in [2]rotaxanes. Whereas the pillar[5]arene macrocycle rapidly shuttles along the full length of the bis (imidazolium) rod for the parent [2]rotaxane, Ag(i) coordination to the imidazolium groups through the formation of N-heterocyclic carbenes leads to restricted motion, effectively confining the shuttling motion of the [2]rotaxane. The Ag(i) coordinated [2]rotaxanes can be reacted further, either removing the Ag-carbene species to recreate the parent [2]rotaxane, or reaction with more bulky Pd(ii) species to further restrict the shuttling motion through steric inhibition.
Related Concept Videos
Coordination Compounds and Nomenclature
Coordination Number and Geometry
Metallic Solids
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
Metal-Ligand Bonds
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
Lattice Centering and Coordination Number
Types of Unit Cells
Imagine taking a large number of identical...
Bonding in Metals

