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Breaking Symmetry: Spontaneous Resolution of a Polyoxometalate
Author(s) -
Hou Yu,
Fang Xikui,
Hill Craig L.
Publication year - 2007
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200701160
Subject(s) - polyoxometalate , enantiomer , circular dichroism , crystallography , lacunary function , chirality (physics) , chemistry , chiral resolution , absolute configuration , enantiopure drug , resolution (logic) , materials science , stereochemistry , symmetry breaking , chiral symmetry breaking , enantioselective synthesis , physics , organic chemistry , nambu–jona lasinio model , mathematics , quantum mechanics , artificial intelligence , pure mathematics , computer science , catalysis
A chiral polyoxometalate [Hf(PW 11 O 39 ) 2 ] 10− ( 1 ) has been prepared and structurally characterized. It crystallizes in the chiral space group P 2 1 2 1 2, as a conglomerate of two enantiomerically pure crystals in the absence of any chiral source. The absolute configuration of 1 was determined from the Flack parameter by X‐ray crystallography. The structure of 1 comprises two lacunary [PW 11 O 39 ] 7− units, each functioning as a tetra‐dentate ligand sandwiching an 8‐coordinate Hf IV centre in a distorted square antiprismatic geometry. Optically active crystals of both enantiomers were spectroscopically distinguishable by means of solid state circular dichroism spectroscopy. This hafnium‐substituted polyoxometalate (POM), 1 , shows that spontaneous chiral resolution, a rare phenomenon, can be operable in POM systems.