Synthesis, Crysta Structure, and Some Propertie of 4-Hydroxymethylpyridinium Hexafluorosilicate

Abstract

Hexafluorosilicate with the composition (LH)₂SiF₆ (I), (L = 4-hydroxymethylpyridine) is isolated as the interaction product of an L methanol solution and 45% hydrofluorosilicic acid (L:H₂SiF₆ = 1:3). It the crystal structure of I the cations and anions are linked by NH···F (N···F of 2.809(2) Å,2.824(2) Å) and OH···F (O···F of 2.7036(18) Å) H bonds; the geometry of the SiF₆²⁻ anion is a distorted octahedron (Si–F distances 1.6780(11)-1.6877(11) Å). In the IR spectrum of I the absorption bands of the main vibrations are identified; the solubility of I in water and some organic solvents and the degree of hydrolysis of the salt in a 1·10⁻⁴ M aqueous solution are determined.