The structure of black formamidinium lead halide, α-[HC(NH2)2]PbI3, at 298 K has been refined from high resolution neutron powder diffraction data and found to adopt a cubic perovskite unit cell, a = 6.3620(8) Å. The trigonal planar [HC(NH2)2]+ cations lie in the central mirror plane of the unit cell with the formamidinium cations disordered over 12 possible sites arranged so that the C-H bond is directed into a cube face, whereas the -NH2 groups hydrogen bond (NH···I = 2.75-3.00 Å) with the iodide atoms of the [PbI3]- framework. High atomic displacement parameters for the formamidinium cation are consistent with rapid molecular rotations at room temperature as evidenced in ab initio molecular dynamic simulations.
|Number of pages||4|
|Journal||Journal of Physical Chemistry Letters|
|Publication status||Published - 2015 Aug 20|
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Physical and Theoretical Chemistry