Abstract
More than three decades of research efforts have yielded powerful methodologies based on transition metal template-directed syntheses for the assembly of a huge number of interlocked systems, molecular knots, machines and synthesizers. Such template techniques have been applied in the preparation of mechanically linked electron donor–acceptor artificial photosynthetic models. Consequently, synthetic challenging photoactive rotaxanes and catenanes have been reported, in which the chromophores are not covalently linked but are still associated with undergoing sequential energy (EnT) and electron transfer (ET) processes upon photoexcitation. Many interlocked photosynthetic models produce highly energetic, but still long-living charge separated states (CSS). The present work describes in a historical perspective some key advances in the field of photoactive interlocked systems assembled by transition metal template techniques, which illustrate the usefulness of rotaxanes and catenanes as molecular scaffolds to organize electron donor–acceptor groups. The effects of molecular dynamics, molecular topology, as well as the role of the transition metal ion used as template species, on the thermodynamic and kinetic parameters of the photoinduced energy and electron transfer processes in the interlocked systems are also discussed.
Highlights
The mechanical bond is defined as an entanglement in space between two or more component parts, such that they cannot be separated without breaking or distorting chemical bonds between atoms
One of the most interesting features of interlocked systems is that the mechanical bond restricts the degrees of freedom of the molecular components when compared to a mixture of the molecules in solution
We describe a brief overview of mechanically linked artificial photosynthetic models assembled by transition metal template techniques
Summary
The mechanical bond is defined as an entanglement in space between two or more component parts, such that they cannot be separated without breaking or distorting chemical bonds between atoms. There are a and Acceptors significant number of D-A interlocked photoactive systems reported in the literature that groupfrom was template the first tosynthetic realize the potential of investigating haveSauvage’s been prepared methodologies based on the rotaxanes formation and of catenanes as interactive scaffolds to organize electron donor–acceptor moieties secondary interactions other than coordinative bonds Those works are beyond in theartificial scope photosynthetic pioneering works [59,60,61,62,63,64,65,66,67,68,69], a largebriefly familydescribing of photoactive of this account. (to prevent dissociation of the rotaxane upon removal of the Cu(I) template ion) were the electron donors
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call