13C CPMAS NMR spectroscopy as a probe for porphyrin–porphyrin and host–guest interactions in the solid state

Abstract

Solid-state 13C cross-polarisation magic-angle spinning (CPMAS) NMR spectra of a range of metalloporphyrin monomers, dimers, trimers and various host–guest adducts have been obtained. Interpretation of these spectra provides information on crystal packing (molecular stacking) and host–guest interactions in the solid state. X-Ray structures are reported for a para- and meta-substituted zinc porphyrin monomer. Comparison of the CPMAS data with the X-ray data of these selected monomers provides convincing evidence for the crystal packing assignment based on both solid state techniques.