论文标题
甲基质子的长寿命状态
Long-Lived States of Methylene Protons in Achiral Molecules
论文作者
论文摘要
结果表明，涉及核磁共振中的亚甲基质子对的长寿命状态（LLS）可以在包含两个或更多相邻的CH $ _2 $基团的常见分子中很容易激发。访问此类LLS不需要任何同位素富集，也不需要任何立体源性中心来提高Ch $ _2 $质子的化学等效性。 LLS的激发是通过多色旋转锁定的交叉（Poly-Slic）实现的。在多种代谢物，神经递质，维生素，氨基酸和其他分子中，LLS首次创建。一个人可以同时在几个不同的分子中激发lls。 Lifetimes t $ _ {lls} $通常比t $ _1 $长3到6倍。
It is shown that long-lived states (LLS) involving pairs of methylene protons in nuclear magnetic resonance (NMR) can be readily excited in common molecules that contain two or more neighboring CH$_2$ groups. Accessing such LLS does not require any isotopic enrichment, nor does it require any stereogenic centers to lift the chemical equivalence of CH$_2$ protons. The excitation of LLS is achieved by polychromatic spinlock-induced crossing (poly-SLIC). In a variety of metabolites, neurotransmitters, vitamins, amino acids, and other molecules, LLS were created for the first time. One can excite LLS in several different molecules simultaneously. The lifetimes T$_{LLS}$ are typically 3 to 6 times longer than T$_1$.
