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Hydration of Oxometallate Ions in Aqueous Solution

Abstract

The strength of hydrogen bonding to and structure of hydrated oxometallate ions in aqueous solution have been studied by double difference infrared (DDIR) spectroscopy and large-angle X-ray scattering (LAXS), respectively. Anions are hydrated by accepting hydrogen bonds from the hydrating water molecules. The oxygen atom of the permanganate and perrhenate ions form weaker and longer hydrogen bonds to water than the hydrogen bonds in bulk water (i.e., they act as structure breakers), while the oxygen atoms of the chromate, dichromate, molybdate, tungstate, and hydrogenvanadate ions form hydrogen bonds stronger than those in bulk water (i.e., they act as structure makers). The oxometallate ions form one hydration shell distinguishable from bulk water as determined by DDIR spectroscopy and LAXS. The hydration of oxoanions results in X−O bond distances ca. 0.02 Å longer than those in unsolvated ions in the solid state not involved in strong bonding to counterions. The oxygens of oxoanions with a central atom from the second and third series in the periodic table and the hydrogenvanadate ion hydrogen bind three hydrating water molecules, while oxygens of oxoanions with a heavier central atom only form hydrogen bonds to two water molecules.

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Category:
Articles
Type:
artykuły w czasopismach
Published in:
INORGANIC CHEMISTRY no. 59, pages 8231 - 8239,
ISSN: 0020-1669
Language:
English
Publication year:
2020
Bibliographic description:
Śmiechowski M., Persson I.: Hydration of Oxometallate Ions in Aqueous Solution// INORGANIC CHEMISTRY -Vol. 59,iss. 12 (2020), s.8231-8239
DOI:
Digital Object Identifier (open in new tab) 10.1021/acs.inorgchem.0c00594
Sources of funding:
  • Statutory activity/subsidy
Verified by:
Gdańsk University of Technology

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