Getting Ready for the Hydrogen Evolution Reaction : The Infrared Spectrum of Hydrated Aluminum Hydride-Hydroxide HAlOH+(H2O)n-1, n = 9–14

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

2 Scopus Citations
View graph of relations

Author(s)

  • Jakob Heller
  • Ethan M. Cunningham
  • Christian van der Linde
  • Wing Ka Lam
  • Milan Ončák
  • Martin K. Beyer

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)16858-16863
Number of pages6
Journal / PublicationAngewandte Chemie - International Edition
Volume60
Issue number31
Online published19 May 2021
Publication statusPublished - 26 Jul 2021

Link(s)

Abstract

Hydrated singly charged aluminum ions eliminate molecular hydrogen in a size regime from 11 to 24 water molecules. Here we probe the structure of HAlOH+(H2O)n−1, = 9–14, by infrared multiple photon spectroscopy in the region of 1400–2250 cm−1. Based on quantum chemical calculations, we assign the features at 1940 cm−1 and 1850 cm−1 to the Al−H stretch in five- and six-coordinate aluminum(III) complexes, respectively. Hydrogen bonding towards the hydride is observed, starting at =12. The frequency of the Al−H stretch is very sensitive to the structure of the hydrogen bonding network, and the large number of isomers leads to significant broadening and red-shifting of the absorption of the hydrogen-bonded Al−H stretch. The hydride can even act as a double hydrogen bond acceptor, shifting the Al−H stretch to frequencies below those of the water bending mode. The onset of hydrogen bonding and disappearance of the free Al−H stretch coincides with the onset of hydrogen evolution.

Research Area(s)

  • hydrogen bonding network, metal hydride, proton transfer, vibrational spectroscopy, water splitting

Citation Format(s)

Getting Ready for the Hydrogen Evolution Reaction : The Infrared Spectrum of Hydrated Aluminum Hydride-Hydroxide HAlOH+(H2O)n-1, n = 9–14. / Heller, Jakob; Tang, Wai Kit; Cunningham, Ethan M.; Demissie, Ephrem G.; van der Linde, Christian; Lam, Wing Ka; Ončák, Milan; Siu, Chi-Kit; Beyer, Martin K.

In: Angewandte Chemie - International Edition, Vol. 60, No. 31, 26.07.2021, p. 16858-16863.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

Download Statistics

No data available