Abstract
A novel mode of containment for metal ions which participate in longer- range interactions with aryl rings (≥ 2.5 Å) is demonstrated in the preorganized cylindrical host 1. Three equatorial sulfur atoms in 1 hold metals in a trigonal planar ligand field between two apical benzene centroids at an M-Ar distance of about 3 Å. Evidence of an interaction between the π electrons and the metals is gained by 1H NMR spectroscopy of the complexes, and support for the general description of metal-arene contacts in the 2.5- 3.5 Å range as 'bonds' is derived from a statistical study of η6- coordination in the solid state. Crystal structures of [Ag(1)]BF4 and [Cu(1)]BF4 confirm the first examples of arene Ag(I) and Cu(I) sandwich complexation and indeed the only structurally characterized Cu(I)-aryl centroid interaction. The two isomeric tris-sulfoxides derived from 1 show less tendency to interact with metals ions.
Original language | English (US) |
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Pages (from-to) | 485-490 |
Number of pages | 6 |
Journal | European Journal of Inorganic Chemistry |
Issue number | 3 |
State | Published - 2000 |
Externally published | Yes |
Keywords
- Coordination modes
- Cyclophanes
- Macrocycles
- Sandwich complexes
- Solid- state structures
ASJC Scopus subject areas
- Inorganic Chemistry