Nuclear spin high polarization method by dynamic nuclear polarization using soluble pentacene

摘要

PROBLEM TO BE SOLVED: To provide a method for improving the polarization rate of a nuclear spin.SOLUTION: A polarization rate of a nuclear spin can be effectively improved by a triplet DNP using a pentacene derivative represented by the following formula (A) as a polarization source. (where in the formula (A), R independently represents a C1-20 hydrocarbon group which may include at least one kind of atoms selected from a group consisting of a hydrogen atom (-H), a deuterium atom (-D) or an oxygen atom, a sulfur atom and a silicon atom, and at least one of Rs is a C1-20 hydrocarbon group which may include at least one kind of atoms selected from a group consisting of an oxygen atom, a sulfur atom and a silicon atom.)SELECTED DRAWING: None