Structural studies in the iron(III)/chloride/α,α'-diimine system. III. Crystal structures of Tris(2,2'-bipyridine)iron(II) μ-Oxo-bis[trichloroferrate(III)] and of 'Compound A', μ-Oxo-bis[cis-chlorobis(1 ,10-phenanthroline)iron(III)] chloride solvate