Institut Pluridiciplinaire de Recherche sur l'Environnement et les Matériaux-UPPA-IPREM-UMR (CNRS) 5254, 2 av. P. Angot, 64053 Pau Cedex 9, France.
Phys Chem Chem Phys. 2010 Nov 14;12(42):14217-26. doi: 10.1039/c0cp00276c. Epub 2010 Sep 28.
The unresolved issue of the maximum number of adsorbed ligands binding to S(II) Na(+) cations contained in a Y zeolite has been investigated and explained using a new experimental approach, specially designed for the specific problem. The formation of Na(+)(CO)(2) di-carbonyls has been identified for the first time for high CO coverage using a survey of IR spectra of the adsorbed CO. Also, the formation of Na(+)(CO)(3) tri-carbonyls is confirmed and the conditions of its formation are thoroughly discussed. Moreover, the adsorption of the CO probe in the large NaY cavities is expressed in terms of four coexisting reactions reflecting the formation of the three Na-carbonyl species which involves the vacant coordination of sodium cations. This study refines the IR vibration bands of the three as-formed carbonyls of interest and provides new information towards the understanding at the molecular scale of how the three free coordination vacancies of Na(+) sites sitting in S(II) positions can be investigated by means of CO binding.
使用专门针对特定问题设计的新实验方法，研究并解释了 Y 型沸石中所含 S(II)Na(+)阳离子吸附配体的最大数量这一未解决的问题。首次通过对吸附 CO 的 IR 光谱进行调查，确定了在高 CO 覆盖度下形成 Na(+)(CO)(2)二羰基。还证实了 Na(+)(CO)(3)三羰基的形成，并彻底讨论了其形成条件。此外，还根据涉及钠离子空位配位的四个共存反应，以 CO 探针在大的 NaY 腔中的吸附来表示，该反应反映了三种 Na-羰基物种的形成。这项研究细化了三种形成的羰基的 IR 振动带，并提供了有关分子尺度上如何通过 CO 结合来研究 S(II)位上的 Na(+)位点的三个自由配位空位的新信息。
