Shameems paper in Chem. Eur. J.


Shameems collaborative paper with Amal El-Nahas and Jens Uhlig on cyclopentadithiophene heterofulvenes is published in Chem. Eur. J.

Synthesis and characterization of cyclopentadithiophene heterofulvenes – Design tools for light activated processes 

Amal El Nahhas,'' Muhammad Anwar Shameem,'' Pavel Chabera, Jens Uhlig* and Andreas Orthaber* 

Chem. Eur. J, 2017, doi:10.1002/chem.201700917 (link)
The development of new materials for solar-to-energy conversion should consider stability, ease of fabrication and beneficial photophysical properties. In this context, a set of novel π-conjugated building blocks, with phospha- and arsaalkenes possessing a unique dithienyl annulated heterofulvenoid core, have been prepared as air and moisture stable sensitizers. These compounds unify both electron-donor and -acceptor moieties making them potential candidates for light harvesting applications. Optical characterization of these systems was performed by steady state and time resolved absorption spectroscopy, supported by (TD)-DFT calculations. Tuning of the optical properties of these systems can be achieved by varying the pnictogen element at the bridgehead position - giving a bathochromic shift of ~40 nm and coordinating the phosphaalkene towards gold Au(I) centers. The latter results in a ~2000-fold extension of the ~10 ps lifetime of uncoordinated systems well into the ns regime.