Unusual Crystal Structures of (RRuRC/SRuRC)-(η6-p-Cymene)Ru Complexes – Diastereomers with Opposite Configuration at the Metal Center in the Unit Cell
✍ Scribed by Henri Brunner; Thomas Neuhierl; Bernhard Nuber
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 195 KB
- Volume
- 1998
- Category
- Article
- ISSN
- 1434-1948
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✦ Synopsis
Condensation of (R)-2-aminobutanol with salicylaldehyde 3b showed a structural peculiarity. The unit cell of these complexes contained diastereomers with the same and 2-pyrrolecarbaldehyde gave the chiral chelate ligands HLL 1 * and HLL 2 *, respectively. The diastereomeric configuration at the carbon atoms but opposite configuration at the metal centers in a 1:1 ratio. Weak intramolecular complexes (R Ru ,R C )-and (S Ru ,R C )-[(η 6 -arene)Ru(LL 1 *)Cl], η 6arene = p-cymene (1a/1b), η 6 -arene = benzene (2a/2b), and OϪH•••Cl hydrogen bridges were formed in all the complexes.
1 H-NMR studies demonstrated the (R Ru ,R C )-and (S Ru ,R C )-[(η 6 -arene)Ru(LL 2 *)Cl], η 6 -arene = pcymene (3a/3b), η 6 -arene = benzene (4a/4b), which only configurational lability at the Ru center. The iodo complexes (R Ru ,R C )-and (S Ru ,R C )-[(η 6 -p-cymene)Ru(LL*)I], LL* = LL 1 * differ in the ruthenium configuration, were prepared by the reaction of [(η 6 -arene)RuCl 2 ] 2 with the anion of the (5a/5b) and LL* = LL 2 * (6a/6b), were synthesized by halogen exchange. corresponding ligand HLL*. X-ray analyses of 1a/1b and 3a/