31{sup left}P double-quantum solid-state NMR study of phosphoroorganic compounds with (O)P-O-P-(O), (S)P-O-P(S) and (S)P-S-P(O) unit

摘要

In this work we have tested applicability of the commonly used double quantum recoupling sequence POST-C7 to study of 31{sup left}p-31{sup left}p geometrical constraints for phosphoroorganic model compounds with different chemical shift anisotropy (CSA) and distinct molecular dynamics in the crystal lattice. Our results clearly show that even with large CSA, POST-C7 gives good efficiency of 31{sup left}P double-quantum excitations. Moreover, large amplitude molecular motion only slightly disturb 31{sup left}P build-up curve. X{sup}2 error analysis is used for verification of values and orientations of chemical shift tensors (CST) parameters employed for simulation of POST-C7 buildup curves.