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.