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Hexaaquazinc(II) dipicrate trihydrate.

Kazumasa Honda1, Hiroshi Yamawaki, Hiroshi Fujihisa

  • 1National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan. kaz-honda@aist.go.jp

Acta Crystallographica. Section C, Crystal Structure Communications
|September 1, 2007
PubMed
Summary

The crystal structure of zinc picrate reveals separate stacks of zinc-aqua complexes and picrate anions, a rare occurrence. This separation may depend on the size of the metal-aqua complex relative to picrate spacing.

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Area of Science:

  • Inorganic Chemistry
  • Crystallography
  • Coordination Chemistry

Background:

  • Metal picrate salts typically exhibit coordination between metal cations and picrate anions.
  • The crystal structure of metal picrate complexes is crucial for understanding their chemical properties and potential applications.

Purpose of the Study:

  • To elucidate the crystal structure of the title compound, [Zn(H2O)6](C(6)H(2)N(3)O(7))2.3H2O.
  • To investigate the coordination behavior between zinc cations and picrate anions in the solid state.
  • To explore factors influencing the formation of separated stacks in metal picrate crystal structures.

Main Methods:

  • Single-crystal X-ray diffraction analysis was employed to determine the crystal structure.
  • The arrangement of zinc-aqua complexes and picrate anions was analyzed.
  • Intermolecular distances, including C...C contacts, were measured.

Main Results:

  • The crystal structure features separate, stacked arrangements of [Zn(H2O)6]2+ cations and picrate anions along the b axis.
  • No direct coordination was observed between the zinc cation and the picrate anion, which is atypical for metal picrate salts.
  • Short intermolecular C...C contacts of 3.223 (6) and 3.194 (6) Å were identified within the picrate stacks.

Conclusions:

  • The formation of separated stacks in divalent metal picrate salts may be influenced by the size of the metal-aqua complex in relation to the intermolecular spacing of picrate anions.
  • This study provides insights into the structural diversity of metal picrate complexes and the factors governing their crystal packing.