Figure 2 Packing diagram viewed along the a axis. The rectangle traced with standard line indicates the unit cell. Color codes; white octa­hedron: MoO6, blue octa­hedron CoO6, and Co(II) complex, green sphere: Rb, red sphere O. The hydrogen bondings are denoted by sky blue dashed lines. The L-Ser mol­ecule and waters of crystallization O atoms unrelated to hydrogen bonding are omitted for clarity.  [article HTML]