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Stereochemical Equivalence of P III ‐Bonded Hydrogen Atoms and |Se IV Lone Electron Pairs in Sr(H 2 PO 3 ) 2 and Sr(HSeO 3 ) 2
Author(s) -
Boldt Kai,
Engelen Bernward,
Panthöfer Martin,
Unterderweide Klaus
Publication year - 2000
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/1099-0682(200009)2000:9<2071::aid-ejic2071>3.0.co;2-o
Subject(s) - chemistry , square antiprism , crystallography , lone pair , hydrogen bond , crystal structure , ion , molecule , lanthanide , organic chemistry
Sr(H 2 PO 3 ) 2 and Sr(HSeO 3 ) 2 have been characterized by means of single crystal X‐ray diffraction and FT‐IR absorption spectroscopy. The IR spectra exhibit split AB band systems in the OH stretching mode region due to Fermi resonance interactions of the ν(OH) with the in‐plane bending modes of the hydroxyl groups. The compounds crystallize in a new structure type and are isotypic, if the P‐bonded hydrogen atoms of Sr(H 2 PO 3 ) 2 and the lone electron pairs of Sr(HSeO 3 ) 2 are considered to be equivalent. The coordination of Sr is that of a distorted square antiprism. The SrO 8 polyhedra share three common edges and are additionally connected via O−X−O bonds of the isolobal XO 2 OH − ions (X = HP III , |Se IV ) of tetrahedral and trigonal (ψ‐tetrahedral) configuration, respectively. The resulting layers ∞ 2 [Sr(XO 2 OH) 2 ] are connected via circular hydrogen bond systems of tetrameric [XO 2 OH − ] 4 groups of a cyclooctane like chair topology. Both the P‐bonded hydrogen atoms and the lone electron pairs of the HP III O 2 OH − and the |Se IV O 2 OH − ions, respectively, form channels along [001] and induce the same crystal structure. This is new for acid salts of the type M II (XO 2 OH) 2 · n H 2 O with X = HP III and |Se IV .