Rational synthesis of a microporous metal–organic framework with PtS topology using a semi-rigid tetrahedral linker

The assembly of a semi-rigid tetrahedral linker tetrakis[4-(carboxyphenyl)oxamethyl]methane acid (H4X) with CuII yields a binodal 4,4-connected coordination framework of distorted PtS topology, which exhibits permanent porosity confirmed by gas adsorption experiments of N2, H2, CO2, and CH4.