Water Adsorption Properties of Fe(pz)[Pt(CN)4] and the Capture of CO2 and CO

H2O and cyclohexane adsorption properties and the CO2 and CO capture capability of the microporous material Fe(pz)[Pt(CN)(4)] were examined. This 3D coordination polymer retained its crystallinity and structural stability after all adsorption-desorption experiments (demonstrated by PXRD and BET surface area). Thus, the total water uptake was equal to 14.6 wt % (8.12 mmol g(-1)) at 90% P/P-0, and in comparison to the adsorption of cyclohexane, Fe(pz) [Pt(CN)(4)] demonstrated a relatively high degree of hydrophilicity. The total cyclohexane uptake of 0.28 mmol g(-1), which in comparison to the total water uptake value of 8.12 mmol g(-1), corroborated such hydrophilic behavior. Additionally, the CO2 capture was equal to 9.3 wt % for activated Fe(pz)[Pt(CN)(4)], a higher value in comparison to other lead MOFs such as NOTT-400 (4.4 wt %), despite the fact that the latter exhibits a larger BET surface area (1356 m(2)Cl) than Fe(pz)[Pt(CN)(4)] (BET = 431 m(2) g(-1)). When the CO2 capture capability was measured on a partially water saturated Fe(pz) [Pt(CN)(4)] sample, we observed a weight gain from 11.7 wt % (only water uptake) to 14.1 wt % (water + CO2). This weight increment (2.4 wt %) was attributed to the oversolubility of CO2. The CO capture on Fe(pz)[Pt(CN)(4)] showed a total uptake of 4.7 mmol/g after only 20 min, a result comparable to those for MOFs with much higher BET surface areas, such as MOF-74(Mg) (BET = 1957 m(2) g(-1); 4.4 mmol g(-1)). Finally, in situ DRIFT experiments exhibited the coordination of CO with open Pt(II) metal sites.