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Chirality and Order in Binary Molecular Crystals of Inert Cobalt(III) Complexes
Author(s) -
Englert Ulli,
Häring Axel,
Hu Chunhua,
Kalf Irmgard
Publication year - 2002
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/1521-3749(200206)628:5<1173::aid-zaac1173>3.0.co;2-s
Subject(s) - chirality (physics) , chemistry , crystallography , cobalt , stereochemistry , enantiopure drug , lewis acids and bases , ethylamine , polymer chemistry , chiral symmetry , organic chemistry , catalysis , enantioselective synthesis , physics , quantum mechanics , nambu–jona lasinio model , quark
Starting from the enantiomerically pure and racemic chiral Lewis bases 1‐phenylethylamine and 1‐(1‐naphthyl)ethylamine inert cobalt(III) complexes of the general composition Co(Hdmg) 2 (lig)X (Hdmg = dimethylglyoximate; lig = Lewis base; X = CN, NCO, NO 2 ) were synthesized and characterized by single crystal X‐ray diffraction. The enantiopure complexes were used as building blocks for the synthesis of binary crystals. Solid solutions resulted from cocrystallizing isomorphous compounds of equal chirality whereas complexes of opposite chirality formed well‐ordered heterochiral solids with efficient packing. Two binary crystals of the latter type could be studied by X‐ray diffraction: Cocrystallization of two isomorphous phenylethylamine derivatives gave a quasiracemic solid. Starting from two non‐isomorphous naphthylethylamine complexes of opposite chirality cocrystals with an unexpected composition were obtained: Their asymmetric unit comprises four independent complex molecules in a 3:1 ratio between the constituents.