The coordination geometry of the cations in the red form of aquatricarbonyl
(1,10-phenanthroline-N,N')rhenium(I) trifluoromethanesulfonate hydrate, [Re
(C12H8N2)(CO)(3)-(H2O)]CF3SO3. H2O, is approximately octahedral, with a fac
ial arrangement of the linearly coordinated carbonyl ligands. The phenanthr
oline (phen) ligands interleave to form a columnar pi-stacked structure.