Rational design of three-dimensional (3D) optically active molecule-based magnets:: Synthesis, structure, optical and, magnetic properties of {[Ru(bpy)3]2+, ClO4-, [MnIICrIII(ox)3]-}n and {[Ru(bpy)2ppy]+, [MIICrIII(ox)3]-}n, with MII = MnII, MnII.: X-ray structure of {[ΔRu(bpy)3]2+, ClO4-, [ΔMnIIΔCrIII(ox)3]-}n and {[ΛRu(bpy)2ppy]+, [ΔMnIIΛCrIII(ox)3]-}n