Charge-assisted Hydrogen-bonded Linear Second-sphere Assemblies MII(DABP)3]3[Cr(C2O4)3]2·14H2O (M = Cu, Ni, Fe, Zn, and Mn) with a Discrete (H2O)14 Cluster of S6 Symmetry

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Contents Vol 63(9)

doi:10.1071/CH09557

Charge-assisted Hydrogen-bonded Linear Second-sphere Assemblies M^II(DABP)₃]₃[Cr(C₂O₄)₃]₂·14H₂O (M = Cu, Ni, Fe, Zn, and Mn) with a Discrete (H₂O)₁₄ Cluster of S ₆ Symmetry

Fuyu Zhuge ^A ^D, Biao Wu ^A ^B ^E, Lihuan Dong ^B, Jin Yang ^B, Christoph Janiak ^C, Ning Tang ^B, Xiao-Juan Yang ^A ^B

^A State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
^B State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China.
^C Institut für Anorganische und Analytische Chemie, Universität Freiburg, Albertstrasse 21, D-79104 Freiburg, Germany.
^D Graduate School of Chinese Academy of Sciences, Beijing 100049, China.
^E Corresponding author. Email: wubiao@lzb.ac.cn





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Australian Journal of Chemistry 63(9) 1358–1364 http://dx.doi.org/10.1071/CH09557
Submitted: 16 October 2009 Accepted: 17 July 2010 Published online: 9 September 2010

Abstract

A series of isomorphous second-sphere coordination compounds [M^II(DABP)₃]₃[Cr(C₂O₄)₃]₂·14H₂O (DABP = 5,5′-diamino-2,2′-bipyridine; M = Cu (1), Ni (2), Fe (3), Zn (4), and Mn (5)) have been constructed through multiple charge-assisted N–H-^–O hydrogen-bonding interactions between the oxalate ligands in [Cr(C₂O₄)₃]^3– (unit B) and the NH₂ groups in the [M(DABP)₃]²⁺ complex (unit A). The chiral [M(DABP)₃]²⁺ cations and [Cr(C₂O₄)₃]^3– anions with the same Λ (or Δ) configuration interdigitate alternately, affording linear A₃B₂ secondary building units. Two adjacent A₃B₂ units adopting opposite configurations are linked by a six-cornered star-shaped 14-water cluster of S ₆ symmetry (unit C) to form a racemic 1D linear chain –A₃B₂(Λ)–C–A₃B₂(Δ)–C–. The microstructure of compound 1 shows a 3D flower-like morphology.