CRYSTAL-STRUCTURES AND VIBRATIONAL-SPECTRA OF MSNF(6)CENTER-DOT-6H2O(M=FE, CO, NI)

Single crystal X-ray structural data (at T = 300 K) are reported for CoSnF6.6H(2)O (rhombohedral; R ($) over bar 3-C-3i(2); a = 9.735(7) Angstrom, c = 10.095(7) Angstrom, gamma = 120 degrees; Z = 3; R = 0.047) and for NiSnF6.6H(2)O (rhombohedral; R ($) over bar 3-C-3i(2); a = 9.697(1) Angstrom, c = 10.021(1) Angstrom, gamma = 120 degrees; Z = 3; R = 0.038). The two compounds are isostructural to FeSnF6.H2O. IR and Raman spectroscopic data (at T = 300 and 75 K) are reported for hydrated and for partially deuterated samples of MSnF(6).6H(2)O (M = Fe, Co, Ni). Two rather similar ($) over bar v(OD) stretching frequencies and one ($) over bar v(HDO) bending frequency of isotopically dilute HDO molecules are observed for either of the three compounds, which is consistent with one crystallographically distinct water molecule forming two different, but rather similar O...F hydrogen bonds.