![Sample our Physical Sciences journals, sign in here to start your FREE access for 14 days]({"type":"image" , "src" : "/sda/110819/TOC-Subject-Sample-2021-Physical-Sciences.jpg"})
Abstract
The determination by X-ray diffraction of the crystal structure of the 1,6-Dihydroxyhexylidene-1,1,6,6-tetraphosphonic acid (DHHTP) has shown that this compound cristallizes in normal conditions as an oxonium sait (1) with 2 water molecules. This compound and the Potassium sait (2) are isostructural and crystallize in the monoclinic C2/c (n°15) space group with Z = 4 and (1): a = 19.935(3)Å, b = 9.925(2)Å, c = 10.195(3)Å β = 108.51(2)°, V = 1912.8(7)Å3; (2) a = 19.914(5)Å b = 9.813(3)Å, c = 10.046(2)Å, β = 107.83(2), V = 1872.5(7)Å3. The Potassium (or Oxonium) cation is eightfold coordinated. The coordination polyhedra are grouped two by two by pooling four oxygen atoms to form ≪ bispolyhedra ≫. The ligands DHHT2− , where the hydrocarboned chain is into maximum extension, are linked together by hydrogen bonds to form molecular chains which are themselves linked together by strong hydrogen bonds. The Infrared and Raman spectra are given.