(C18H36N2O6NA)2[TA6CL12(CH3O)6]CENTER-DOT-6CH3OH WITH PARTIAL SUBSTITUTION OF CH3O- BY OH-

Bis[(4,7,13,16,21,24-hexaoxa-1,10-diazabicyclo[8.8.8]-hexacosane-kappa2N,kappa6O)sodium] dodeca-mu-chlorohexamethoxy-1kappaO,2kappaO,3kappaO,4kappaO,5kappaO,6kappaO-octahedro-hexatantalate-methanol (1/6), [Na(C18H36N2O6)]2-[Ta6Cl12(CH3O)5.4(OH)0.6].6CH3OH, is built of (C18H36N2O6Na)+ cations, [Ta6Cl12(OCH3/lOH)6]2- anions and solvating methanol molecules linked by hydrogen bridges to the anions. The octahedral [Ta6Cl12]4+ cluster unit exhibits two slightly different Ta-Ta distances of 2.978 (1) and 2.987 (1) angstrom. All four crystallographically distinct Ta-Cl distances are identical within one standard deviation [2.447 (3) - 2.449 (3) angstrom]. For the terminal methoxy ligand a Ta-O distance of 2.05 (1) angstrom is observed. Because of the preparation procedure employed, we expected a partial substitution of OCH3- by OH-, which was supported by the structure refinement as only 90% occupancy of the position of the C atom was observed.