Structures of [Mg·(H2O)1,2]+ and [Al·(H2O)1,2]+ ions studied by infrared photodissociation spectroscopy: Evidence of [HO-Al-H]+ ion core structure in [Al·(H2O)2]+
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Infrared spectra of [Mg·(H2O)1,2]+ and [Al·(H2O)1,2]+ are measured in the OH stretching region (3200-3800 cm-1). The spectra show the symmetric and asymmetric OH stretching bands of water molecules that are directly bound to the metal ions through metal-oxygen intermolecular bonds. In addition to these bands, the [Al·(H2O)2]+ ion has another band at 3714 cm-1. This band is assigned to the free OH stretching vibration of the [HO-Al-H]+ ion; the aluminum ion is inserted into the O-H bond of one water molecule in [Al·(H 2O)2]+.
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