Template-directed synthesis of three metal oxalates via 4-connected building units

Abstract

Three novel compounds, [Co(en)₃]₂[Zr₂(C₂O₄)₇]·2H₂O(HNU-2, en=ethylenediamine), [Co(NH₃)₆]· [Ce(C₂O₄)₃(H₂O)]·H₂O(HNU-3) and [Co(dien)₂][Gd(C₂O₄)₃]·0.75H₂O(HNU-4, dien=dethylenetriamine) were hydrothermal synthesized based on the templates of [Co(en)₃]Cl₃, [Co(NH₃)₆]Cl₃ and [Co(dien)₂]Cl₃, respectively. The Zr⁴⁺, Ce³⁺ and Gd³⁺ cations are all coordinated by four oxalates to form [M(C₂O₄)₄(H₂O) _n] ^m−(M=Zr, Ce or Gd; n=0 or 1; m=4 or 5), which are similar to [In(C₂O₄)₄]⁵⁻ in NKB-1, and can be regarded as 4-connected building units. The [M(C₂O₄)₄(H₂O) _n] ^m− units are connected via sharing the bis-bidentate bridging oxalate ligands to form binuclears in HNU-2 and 1D “zigzag” chains in HNU-3 and HNU-4. It is suggested that these compounds could be used as molecular building units to design 3D open frameworks with zeolite topologies.

Keywords

Coordination polymer / Template-directed synthesis / Metal oxalate

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