| Abstract
| - Novel tri- and hexanuclear zinc(II) phosphonate clusters are readily assembled in nearly quantitative yields by the reaction of ZnCl2 with tert-butyl- or phenylphosphonic acid in the presence of 3,5-dimethylpyrazole as the ancillary ligand
- The reaction of ZnCl2 with tert-butylphosphonic acid and 3,5-dimethylpyrazole in the presence of triethylamine as a hydrogenchloride scavenger affords a trinuclear molecular zinc phosphonate[Zn3Cl2(3,5-Me2Pz)4(t-BuPO3)2]. The structure of this compoundcontains a planar trizinc assembly containing two bicapping μ3[t-BuPO3]2- ligands and terminal pyrazole and chloride ligands. Incontrast an analogous reaction of ZnCl2 with phenylphosphonicacid and 3,5-dimethylpyrazole affords a hexanuclear zinc phosphonate [Zn6Cl4(3,5-Me2PzH)8(PhPO3)4]. The six zinc centers arearranged in a chairlike conformation. The four phosphonates inthis complex also act as bridging tripodal μ3 [RPO3]2- ligands.
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