A multifunctional porous metal organic framework based on mixed-valence hexa-nuclear [(Mn2Mn4O2)-Mn-III-O-II(pyz)(2)(C6H5CH2COO)(10)] (pyz = pyrazine) units has been synthesized. The complex has been characterized by elemental analysis, IR spectroscopy, single-crystal X-ray diffraction analysis, and variable-temperature magnetic measurements. The structural analysis reveals that the bidentate pyz molecules connect each [Mn-6] unit to its four [Mn-6] neighbors through the peripheral Mn(II) centers, giving rise to a three-dimensional (3D) distorted diamond-like porous framework. Variable-temperature (2-300 K) magnetic susceptibility measurements show the presence of dominant antiferromagnetic interactions within the discrete [Mn6] cluster that have been fitted with a model containing three exchange constants developed for the complex (J(1) = 8.6 cm(-1), J(2) = 3.9 cm(-1), and J(3) = 100.0 cm(-1)). Using 3,5-di-tert-butyl catechol (3,5-DTBC) as the substrate, catecholase activity of the complex has been studied; the turn over number is determined to be of 2547 h(-1) in shows remarkable selectivity for adsorption of CO2 over N-2 that may be correlated with the effect pore to the corresponding adsorbate molecules. acetonitrile. This porous compound of window flexibility of the of the pore to the corresponding adsorbate molecules.