Synthesis and crystal structures of complexes between caesium thiocyanate and two isomeric macrocyclic crown polyethers, 6,7,9,10,17,18,20,21-octahydro-7R,9R,18S,20S-tetramethyldibenzo[b,k][1,4,7,10,13,16]hexaoxacyclo-octadecin (isomer F) and 6,7,9,10,17,18,20,21-octahydro-7R,9R,18R,20R-tetramethyldibenzo[b,k][1,4,7,10,13,16]-hexaoxacyclo-octadecin (isomer G)
- 1 January 1973
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Chemical Communications
- No. 18,p. 694-695
- https://doi.org/10.1039/c39730000694
Abstract
Two isomers, F and G, of tetramethyldibenzo-18-crown-6 each with 4 chiral carbon atoms give complexes with caesium thiocyanate; CsNCS(F) consists of centrosymmetrical dimeric molecules with Cs–N–Cs bridges, the other co-ordinating atoms being the six oxygens of F at 3·07–3·34 Å and the aryl carbon atoms at 3·79 Å, while CsNCS(G)2 consists of Cs(G)2 + cations having symmetry with 12 Cs–O contacts at 3·17–3·43 Å and disordered thiocyanate ions.Keywords
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