Fixation of CO2 in bi-layered coordination networks of zinc tetra(4-carboxyphenyl)porphyrin with multi-component [Pr2Na3(NO3)(H2O)3] connectors

Abstract

CO₂ is fixed in a rare μ₂-η²_O,O bridging mode by bi-layered coordination networks of ZnTCPP tessellated along the four equatorial directions by [Pr₂Na₃(NO₃)(H₂O)₃]⁸⁺ connecting clusters in a 2 : 1 ratio (1), but not in the isomorphous free-base porphyrin analogue [(TCPPH₂)₂(Pr₂Na₃(NO₃)(H₂O)₃)]_n (2), revealing the crucial role of the zinc metal in this process.