Communications: Chain and double-ring polymeric structures: Observation of AlnH3n+1− (n = 4–8) and Al4H14−

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2010
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Li, Xiang
Grubisic, Andrej
Bowen, Kit H.
Kandalam, Anil K.
Kiran, Boggavarapu
Jena, Puru
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A pulsed arc discharge source was used to prepare gas-phase, aluminum hydride cluster anions, AlnHm−, exhibiting enhanced hydrogen content. The maximum number of hydrogen atoms in AlnHm− species was m = 3n+1 for n = 5–8, i.e., AlnH3n+1−, and m = 3n+2 for n = 4, i.e., Al4H14−, as observed in their mass spectra. These are the most hydrogen-rich aluminum hydrides to be observed thus far, transcending the 3:1 hydrogen-to-aluminum ratio in alane. Even more striking, ion intensities for AlnHm− species with m = 3n+1 and m = 3n+2 hydrogen atoms were significantly higher than those of nearby AlnHm− mass peaks for which m<3n+1, i.e., the ion intensities for AlnH3n+1− and for Al4H14− deviated from the roughly bell-shaped ion intensity patterns seen for most AlnHm− species, in which m ranges from 1 to 3n. Calculations based on density functional theory showed that AlnH3n+1− clusters have chain and/or double-ring polymeric structures.

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530 Physik
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aluminium compounds, density functional theory, mass spectra, negative ions, polymer structure, polymers
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ISO 690LI, Xiang, Andrej GRUBISIC, Kit H. BOWEN, Anil K. KANDALAM, Boggavarapu KIRAN, Gerd GANTEFÖR, Puru JENA, 2010. Communications: Chain and double-ring polymeric structures: Observation of AlnH3n+1− (n = 4–8) and Al4H14−. In: The Journal of Chemical Physics. 2010, 132(24), 241103. ISSN 0021-9606. eISSN 1089-7690. Available under: doi: 10.1063/1.3458912
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@article{Li2010-06-28Commu-12481,
  year={2010},
  doi={10.1063/1.3458912},
  title={Communications: Chain and double-ring polymeric structures: Observation of AlnH3n+1− (n = 4–8) and Al4H14−},
  number={24},
  volume={132},
  issn={0021-9606},
  journal={The Journal of Chemical Physics},
  author={Li, Xiang and Grubisic, Andrej and Bowen, Kit H. and Kandalam, Anil K. and Kiran, Boggavarapu and Ganteför, Gerd and Jena, Puru},
  note={Article Number: 241103}
}
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