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Self‐assembly formation of the magic ion of (H 2 O) 20 O + : observation of nanoscale cages of oxygenated water clusters induced from iron nanoparticles
Author(s) -
Wu HuiFen,
Chin ChenChe,
Liu BoMin,
Chen YuanChin,
Lin ChiHsien,
Chang KaiDi,
Lee YiHsien
Publication year - 2011
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.4865
Subject(s) - chemistry , ion , mass spectrometry , tandem mass spectrometry , electrospray , cluster (spacecraft) , aqueous solution , molecule , nanoparticle , magic number (chemistry) , water cluster , electrospray ionization , analytical chemistry (journal) , nanotechnology , chromatography , computational chemistry , organic chemistry , hydrogen bond , materials science , electronic structure , computer science , programming language
For the first time, we observed a stable and intense ion ( m/z 376) of the oxygenated water cluster ion ((H 2 O) 20 O + ) produced from simply spraying an aqueous solution of iron nanoparticles (Fe NPs) into an electrospray mass spectrometry (ESI‐MS) system. Tandem mass spectrometric (MS/MS and MS/MS/MS) results were applied to identify the assignments of the fragment ions of m/z 376 in order to explore the possible structures of this cluster ion. The possible structures of the (H 2 O) 20 O + ions are proposed as pentagonal dodecahedron water clathrate cages from the results of tandem mass spectrometry since eliminations of five water molecules were frequently observed in the MS/MS results for many subsequent fragment ions of m/z 376. The formation of this oxygenated water cluster ion ((H 2 O) 20 O + ) in ESI‐MS is attributed to the high surface reactivity and surface energy of Fe NPs during ESI processes (under high temperature and high voltage (5 kV) of ESI spray environment). We believe that the observation of self‐assembly formation of oxygenated water clusters is an important issue in nanoscience as well as in the fields of water clusters. Copyright © 2011 John Wiley & Sons, Ltd.