A Sr(II)-Zr(IV)-Cd(II) Alkoxide Cluster: Synthesis and X-Ray Structure of [{Cd(OPrⁱ)₃}Sr{Zr₂(OPrⁱ)₉}]₂

Abstract

New heterotrimetallic alkoxide [{Cd(OPrⁱ)₃}Sr{Zr₂(OPrⁱ)₉}]₂ (1) is obtained quantitatively in an anion-exchange reaction involving well-characterised iodide heterobimetallic alkoxide ICd{Zr₂(OPrⁱ)₉} and the alkali metal reagent KSr(OPrⁱ)₃. The formation of 1 is accompanied with an exchange of metals (Cd(II) and Sr(II)) between the constituting fragments (‘Cd{Zr₂(OPrⁱ)₉}⁺’ and ‘Sr(OPrⁱ)₃ ⁻’) and the chelating Zr₂(OPrⁱ)₉ ⁻ anion, in 1, coordinates to Sr²⁺ in contrast to the precursor ICdZr₂(OPrⁱ)₉ where it is bound to Cd²⁺. The heterotrimetallic nature of 1 is unambiguously established by multinuclear (¹H, ¹³C and ¹¹³Cd) NMR spectral data and a single crystal X-ray diffraction analysis.

Keywords::

• Heterotrimetallic frameworks
• halide heterobimetallic alkoxides
• anion-exchange reaction