Filming ultrafast roaming-mediated isomerization of bismuth triiodide in solution

Roaming reaction, defined as a reaction yielding products via reorientational motion in the long-range region (3 – 8 Å) of the potential, is a relatively recently proposed reaction pathway and is now regarded as a universal mechanism that can explain the unimolecular dissociation and isomerization of various molecules. The structural movements of the partially dissociated fragments originating from the frustrated bond fission at the onset of roaming, however, have been explored mostly via theoretical simulations and rarely observed experimentally. Here, we report an investigation of the structural dynamics during a roaming-mediated isomerization reaction of bismuth triiodide (BiI3) in acetonitrile solution using femtosecond time-resolved x-ray liquidography. Structural analysis of the data visualizes the atomic movements during the roaming-mediated isomerization process including the opening of the Bi-Ib-Ic angle and the closing of Ia-Bi-Ib-Ic dihedral angle, each by ~40°, as well as the shortening of the Ib···Ic distance, following the frustrated bond fission.

Effect of solvent vapour annealing on bismuth triiodide film for photovoltaic applications and its optoelectronic properties

The annealing ambient conditions affect the morphology and optoelectronic quality of bismuth triiodide film and hence impact on the photovoltaic device parameters.

Bismuth triiodide complexes: structure, spectroscopy, electronic properties, and memristive properties

A clockwise and anticlockwise I–V pattern observed for memristive devices based on bismuth(iii) iodide organic–inorganic complexes and different metal electrodes.