Abstract
The reaction of benzoxazole-2(1H)-thione (C7H5ONS) with either solid NaOH or NaH, in toluene solution, in the presence of hexamethylphosphoramide (hmpa), afforded the new complex C7H4ONSNa(µ-hmpa)3NaC7H4ONS 1 in good yield. In contrast to similar lithium and calcium complexes, 1 resists the incorporation of water into the metal co-ordination sphere. Characterisation by single-crystal X-ray diffraction revealed that, in the solid state, complex 1 is dimeric through three bridging hmpa ligands. This dimer is unsymmetrically co-ordinated by C7H4ONS– anions, one metal centre being co-ordinated by a N,S-chelated anion formally derived from the thiol tautomer, the other being co-ordinated only through N of an anion formally derived from the amine tautomer of benzoxazole-2(1H)-thione. In addition to these unusual structural features, the dimeric complex 1 is further associated by weak C–H ⋯ O and C–H ⋯ S hydrogen bonding interactions.
Published Version
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