Polymorphs and pseudo-polylmorphs of u-oxo-bis[N,N'-bis(salicylidene)propane-1,3-diamine]oxorhenium(V)

Two new polymorphs of the title compound, u-oxo-bis{oxo{2,2'-[propane-1,3-diylbis(nitrilomethylidyne)]diphenolato}rhenium(V)}, [Re2O(C17H16N2O3)2], are reported, containing either a conformation other than the one already known in the literature or a disorder involving both the new and the previously reported conformations. Four pseudo-polymorphs of the title compound are also reported, containing four chloroform, two chloroform, two disordered dichloromethane or two water solvate molecules accompanying each Re complex molecule. Only in the hydrate does the Re complex adopt the old conformation. In all six structures, the complex molecule is located on a crystallographic inversion centre. Independent of the conformation, all ReV ions display the same, somewhat distorted, octahedral coordination. In all the solvates, hydrogen bonds are donated from the solvent to the O atoms bonded to Re, either of the C-HO or O-HO type, although the actual position of the solvent molecule can vary. Only in the hydrate is a two-dimensional hydrogen-bonded network found; isolated clusters are formed in all the other solvates.