with R 0 = 2.752 Å and B = 0.37 yields Sn(1) = 2.15 (the square pyramid) and Sn(2) = 2.14. This compares to cubic (CH 3 NH 3 )SnI 3 (BVS = 2.21) and orthorhombic CsSnI 3 (BVS = 2.25). As such, it is reasonable to discuss the optical and electronic properties of the titled compound as pertaining to a formal Sn(II) oxidation state. Analysis of local pair correlations is also consistent with Sn(II)-I coordination geometries. Pair distribution function analysis of X-ray total scattering data reveals atomic separations between Sn and I ranges from 2.9-3.3 Å, highlighted by the lowest-r peak in Figure . Sn(IV)-I atomic separations are expected at lower interatomic distances (e.g., 2.84 Å73 ). The experimental PDF confirms that the structure determined by SCXRD describes the experimental pair correlations, further supporting the local coordination geometry and inferred oxidation state.