EVIDENCE OF CYCLIC STRUCTURES IN PROTONATED HYDROGEN-BONDED COMPLEXES

被引:14
作者
WEI, S
TZENG, WB
CASTLEMAN, AW
机构
[1] Department of Chemistry, The Pennsylvania State University, University Park
关键词
D O I
10.1016/0009-2614(91)90274-D
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The ion intensity distributions of mixed (A)n((CH3)3N)mH+ (A = H2O or NH3) ions and their metastable decompositions are investigated with a reflectron time-of-flight mass spectrometry technique. An intensity drop after magic numbers at m = n+2 when n less-than-or-equal-to 4 for A = H2O and at m = 2(n+1) when n less-than-or-equal-to 5 for A = NH3 is observed. However, the pattern breaks down when n > 4 for water system and n > 5 for ammonia system. Thereupon, the intensity drop occurs at the point with one molecule less than the pattern required, i.e. m = (n+2) - 1 when n = 5 for A = H2O and m = 2(n+1) - 1 when n = 6 for A = NH3. These findings along with the results of metastable decomposition studies provide direct evidence for the onset of hydrogen-bonded cyclic structures from chain-like ones which reorganize at critical cluster sizes.
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收藏
页码:411 / 418
页数:8
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