Quantum structure of the intermolecular proton bond
Quantum structure of the intermolecular proton bond
复制标题
DOI：
10.1126/science.1138962
复制
发表时间：
2007-04-13
期刊：
影响因子：
56.9
通讯作者：
Johnson, M. A.
中科院分区：
文献类型：
--
作者：
Roscioli, J. R.;McCunn, L. R.;Johnson, M. A.
质子两个封闭壳层分子之间共享的质子[A]。H +。B]，构成了生物过程中普遍存在的软结合基序。与共享质子相关的振动跃迁，提供了这种相互作用的直接探针，已经在凝聚相中进行了广泛的研究，但由于它们的弥散特性，只产生了有限的详细信息。我们利用气相离子光谱的最新进展，在18个冷的、分离的[a]中，确定了可以分配给共享质子和两个拴系分子的尖锐光谱特征。H +。B)离子。这些数据产生了微观尺度下分子间质子键的图像，便于在软性多原子分子的背景下分析其性质。
A proton shared between two closed-shell molecules, [A . H+ . B], constitutes a ubiquitous soft binding motif in biological processes. The vibrational transitions associated with the shared proton, which provide a direct probe of this interaction, have been extensively studied in the condensed phase but have yielded only limited detailed information because of their diffuse character. We exploited recent advances in gas-phase ion spectroscopy to identify sharp spectral features that can be assigned to both the shared proton and the two tethered molecules in a survey of 18 cold, isolated [ A . H+ . B] ions. These data yield a picture of the intermolecular proton bond at a microscopic scale, facilitating analysis of its properties within the context of a floppy polyatomic molecule.