论文标题
在脂肪族链中的Decalized长寿命质子自旋状态的多色激发
Polychromatic Excitation of Delocalized Long-Lived Proton Spin States in Aliphatic Chains
论文作者
论文摘要
长寿状态（LLS）涉及磁性不相等但化学上等效的脂肪族（Ch $ _2 $）$ _ N $链条的磁性质子旋转，可以通过在n化学移动液在n化学移位的弱选择性移位（RF）领域中通过多型自旋锁定锁定诱导的交叉（Poly-slic）来激发。通过混合仪内单线态和包括包含四个或六个旋转的产物的LLS的激发，LLS在整个脂肪族链中进行了离域。模型化合物中测得的寿命t $ _ {lls} $比T1长5倍，并且受到与大分子的相互作用的强烈影响。
Long-lived states (LLS) involving pairs of magnetically inequivalent but chemically equivalent proton spins in aliphatic (CH$_2$)$_n$ chains can be excited by simultaneous application of weak selective radio-frequency (RF) fields at n chemical shifts by polychromatic spin lock induced crossing (poly-SLIC). The LLS are delocalized throughout the aliphatic chain by mixing of intrapair singlet states and by excitation of LLS comprising products of four or six spins. The measured lifetimes T$_{LLS}$ in a model compound are about 5 times longer than T1, and are strongly affected by interactions with macromolecules.
