Rational Design of Three-Dimensional (3D) Optically Active Molecule-Based Magnets: Synthesis, Structure, Optical and Magnetic Properties of {[Ru(bpy) 3 ] 2+ , ClO 4 - , [Mn II Cr III (ox) 3 ] - } n and {[Ru(bpy) 2 ppy] + , [M II Cr III (ox) 3 ] - } n , with M II = Mn II , Ni II . X-ray Structure of {[ΔRu(bpy) 3 ] 2+ , ClO 4 - , [ΔMn II ΔCr III (ox) 3 ] - } n and {[ΛRu(bpy) 2 ppy] + , [ΛMn II ΛCr III (ox) 3 ] - } n