Structure cristalline de [(CH 3) 3CNH 3] 2SnCl 6 · 2H 2O

Abstract

The crystal structure of [(CH 3) 3CNH 3] 2SnCl 6 · 2H 2O with orthorhombic symmetry and lattice parameters a = 10.9074(8)Å, b = 10.1322(7)Å, c = 19.148(2)Å, α = β = γ = 90°, D calc = 1.56g/cm 3, and Z = 4 has been determined by Patterson and Fourier techniques at room temperature, using 1290 reflections. The agreement factors for these calculations are R F = 0.036 and R WF = 0.039 in space group Pcab. The structure is derived from the antifluorite type and consists of layers of SnCl 2− 6 octahedra. In the remaining tetrahedral holes the H 2O and (CH 3) 3CNH + 3 molecules are situated. The last two entities are nearly isolated and interconnected by hydrogen bonds of the type N H ... Cl and O H ... Cl to the SnCl 2− 6 layers. Characteristic lengths of these distances are N Cl ∼3.6Åand O Cl ∼3.4Å.