1,3,5-Triazine adducts with AsF5. Crystal structure of (HCN)3·AsF5
Abstract
1,3,5-Triazine was treated with AsF5 in different stoichiometries to yield the adduct complexes (HCN)3·nAsF51–3(n= 1–3), the latter of which (3) is stable in solution only. The monoadduct (HCN)3·AsF5 crystallizes in the orthorhombic space group Pcab with cell parameters a= 10.584(13), b= 12.965(11) and c= 10.369(5)Å. The crystal data were collected at 100 K and the final refinement values are R= 0.051 and R′= 0.071. All compounds have been characterized by chemical analyses, vibrational spectrometry (IR and Raman) and 1H, 13C and 14N NMR spectroscopy. The thermodynamics of the adduct formation between (HCN)3 and AsF5 are discussed on the basis of the extended hard-soft acid-base principle.