An object is to provide a method for enhancing a nuclear spin polarization. Triplet DNP where a pentacene derivative represented by the following formula (A) is used as a polarizing agent enables an effective enhancement in nuclear spin polarization to be achieved. In formula (A), each R independently represents a hydrogen atom (-H), a deuterium atom (-D), or a hydrocarbon group having 1 to 20 carbon atoms which optionally includes at least one atom selected from the group consisting of an oxygen atom, a sulfur atom and a silicon atom, provided that at least one R represents a hydrocarbon group having 1 to 20 carbon atoms which optionally includes at least one atom selected from the group consisting of an oxygen atom, a sulfur atom and a silicon atom.
目的是提供一种增强核自旋极化的方法。使用下式(A)所代表的
并五苯衍
生物作为极化剂的三重 DNP 能有效增强核自旋极化。在式 (A) 中,每个 R 独立地代表氢原子 (-H)、
氘原子 (-D) 或具有 1 至 20 个碳原子的烃基,其中任选包括至少一个选自氧原子、
硫原子和
硅原子组成的组的原子,条件是至少一个 R 代表具有 1 至 20 个碳原子的烃基,其中任选包括至少一个选自氧原子、
硫原子和
硅原子组成的组的原子。