Dinuclear Molybdenum(III) and Tungsten(III) Calix[4]arene Complexes − Metal-Metal Triple Bonds Supported by Bridging Calix[4]arene Ligands
✍ Scribed by Udo Radius; Juri Attner
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 511 KB
- Volume
- 1998
- Category
- Article
- ISSN
- 1434-1948
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✦ Synopsis
Addition of p-tert-butylcalix[4]arene LH 4 to the dinuclear ported by two bridging µ 2 -κ 2 O,κ 2 O-calix[4]arene ligands in compounds M 2 (NMe 2 ) 6 (M = Mo, W) results in the formation the solid state. These compounds are the first examples of a of [NH 2 Me 2 ] 2 [L 2 M 2 ] 1 (M = Mo) and 2 (M = W). Both com-formally fourfold deprotonated calix[4]arene acting as a µ 2pounds have been characterized by spectroscopic methods κ 2 O,κ 2 O bridging ligand for two transition metal centres. The and single-crystal X-ray diffraction. The metalϪmetal dis-calix[4]arenes in 1 and 2 are distorted from a cone conformatances of 1 and 2, of 2.194(1) A ˚and 2.293(1) A ˚, respectively, tion in the uncomplexed ligand, to an elliptical cone section. are consistent with the retention of the MϵM triple bond. 1 H-NMR data at variable temperatures suggest fluxional Both "ate" complexes contain a [MϵM] 6+ dimetal core, sup-behaviour of 1 and 2 in solution.