High-Resolution Solid-State Cross-Polarization Magic-Angle Spinning 13C NMR of Metal-Free Phthalocyanines

Abstract

The high-resolution solid-state cross-polarization magic-angle spinning 13C NMR spectra of α, β, τ and X-form metal-free phthalocyanines (H2pc) were investigated. Chemical shifts differed according to crystal forms. As a result of the temperature dependence of chemical shifts, we could observe the change in the spectra because of the inner protons.