Structure of protonated solvation complexes: Ammonia-trimethylamine cluster ions and their metastable decompositions

Journal Article · Thu Jan 24 04:00:00 EST 1991 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100155a019· OSTI ID:5926220

Wei, S; Tzeng, W B; Castelman, Jr, A W ^[1]

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1. Pennsylvania State Univ., University Park (USA)

The stable structures and metastable decomposition processes of neat trimethylamine and mixed ammonia-trimethylamine cluster ions are studied by using a reflectron time-of-flight mass spectrometer in conjunction with multiphoton ionization. The kinetic energy release of neat trimethylamine cluster ions is measured, and the binding energies are determined by using Klots' and Engelking's models. Observations on the relative cluster ion intensity distributions of (NH{sub 3}){sub n}((CH{sub 3}){sub 3}N){sub m}H{sup +} under various experimental conditions suggest that NH{sub 3}((CH{sub 3})N){sub 4}H{sup +}, (NH{sub 3}){sub 2}((CH{sub 3}){sub 3}N){sub 6}H{sup +}, (NH{sub 3}){sub 3}((CH{sub 3}){sub 3}N){sub 8}H{sup +}, (NH{sub 3}){sub 4}((CH{sub 3}){sub 3}N){sub 10}H{sup +}, and (NH{sub 3}){sub 5}((CH{sub 3}){sub 3}N){sub 12}H{sup +} are particularly stable. The stable configurations of these ionic species have been proposed to have central species NH{sub 4}{sup +}, N{sub 2}H{sub 7}{sup +}, N{sub 3}H{sub 13}{sup +}, and N{sub 5}H{sub 16}{sup +} which provide 4, 6, 8, 10, and 12 hydrogen-bonding sites, respectively, for the surrounding (CH{sub 3}){sub 3}N molecules. The pattern of magic numbers at m = 2(n + 1) begins to break down at n = 6.

• DOE Contract Number: FG02-88ER60648
• OSTI ID: 5926220
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 95:2; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
AMINES
AMMONIA
BINDING ENERGY
CHEMICAL REACTIONS
DATA
DECOMPOSITION
DYNAMIC MASS SPECTROMETERS
ENERGY
EXPERIMENTAL DATA
HYDRIDES
HYDROGEN COMPOUNDS
INFORMATION
KINETIC ENERGY
MASS SPECTROMETERS
MASS SPECTROSCOPY
MEASURING INSTRUMENTS
METHYLAMINE
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NUMERICAL DATA
ORGANIC COMPOUNDS
SOLVATION
SPECTROMETERS
SPECTROSCOPY
TIME-OF-FLIGHT MASS SPECTROMETERS
TIME-OF-FLIGHT SPECTROMETERS