Pure In-Phase Heteronuclear Correlation NMR Experiments


  • Financial support provided by MINECO of Spain (project CTQ2012-32436) is gratefully acknowledged. We thank SeRMN, Universitat Autònoma de Barcelona, for allocating instrument time to this project and R. R. Gil for a sample of PMMA gel.


A general NMR approach to provide pure in-phase (PIP) multiplets in heteronuclear correlation experiments is described. The implementation of a zero-quantum filter efficiently suppresses any unwanted anti-phase contributions that usually distort the multiplet pattern of cross-peaks and can hamper their analysis. The clean pattern obtained in PIP-HSQMBC experiments is suitable for a direct extraction of coupling constants in resolved signals, for a peak-fitting process from a reference signal, and for the application of the IPAP technique in non-resolved multiplets.