The PCN-224 framework is grown from a solution of H2TCPP and zirconyl chloride octahydrate in a mixture of DMF and acetic acid. The MOFs Pt(II)PCN-224 and Pd(II)PCN-224 were synthesized similarly using the Pt(II) and Pd(II) metalated porphyrin derivatives of H2TCPP. Residuals of DMF were removed by repeated addition and evaporation of acetone and the MOFs were activated via prolonged treatment in vacuum at elevated temperature (72 h, 0.7 mbar, 120 °C). The crystal size and morphology of PCN-224, Pt(II)PCN-224 and Pd(II)PCN-224 was investigated using scanning electron microscopy (Fig. , S11 and S12, respectively) and cubical crystals with an edge length of around 3-4 µm were obtained in all cases.