Crystal structures of {[Cu(Lpn)2][Fe(CN)5(NO)]-H2O}n and {[Cu(Lpn)2]3[Cr(CN)6]2·5H2O}n [where Lpn = (R)-propane-1,2-diamine]: Two heterometallic chiral cyanide-bridged coordination polymers

Olha Sereda, Helen Stoeckli-Evans*, William Thomas Alexander Harrison

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

The title compounds, catena-poly[[[bis[(R)-propane-1,2-diamine-κ2 N,N′]-copper(II)]-μ-cyanido-κ2 N: C-[tris(cyanido-κC)(nitroso-κN) iron(III)]-μ-cyan-ido-κ2C: N] monohydrate], {[Cu(Lpn)2][Fe(CN)5(NO)]⋯H2O}n, (I), and poly-[[hexa-μ-cyanido-κ12C: N-hexacyanido-κ6C-hexakis[(R)-propane-1,2-diamine-κ2N,N′]dichromium(III) tricopper(II)] pentahydrate], {[Cu(Lpn)2]3[Cr(CN)6]2·-5H2O}n, (II) [where Lpn = (R)-propane-1,2-diamine, C3H10N2], are new chiral cyanide-bridged bimetallic coordination polymers. The asymmetric unit of compound (I) is composed of two independent cation-anion units of {[Cu(Lpn)2][Fe(CN)5)(NO)]} and two water molecules. The FeIII atoms have distorted octahedral geometries, while the CuII atoms can be considered to be pentacoordinate. In the crystal, however, the units align to form zigzag cyanide-bridged chains propagating along [101]. Hence, the Cu atoms have distorted octahedral coordination spheres with extremely long semicoordination Cu - N(cyanido) bridging bonds. The chains are linked by O - H⋯ N and N - H⋯N hydrogen bonds, forming two-dimensional networks parallel to (010), and the networks are linked via N - H⋯O and N - H⋯N hydrogen bonds, forming a three-dimensional framework. Compound (II) is a two-dimensional cyanide-bridged coordination polymer. The asymmetric unit is composed of two chiral {[Cu(Lpn)2][Cr(CN)6]} anions bridged by a chiral [Cu(Lpn)2]2+ cation and five water molecules of crystallization. Both the CrIII atoms and the central CuII atom have distorted octahedral geometries. The coordination spheres of the outer Cu atoms of the asymmetric unit can be considered to be pentacoordinate. In the crystal, these units are bridged by long semicoordination Cu - N(cyanide) bridging bonds forming a two-dimensional network, hence these CuII atoms now have distorted octahedral geometries. The networks, which lie parallel to (101), are linked via O - H⋯ O, O - H⋯ N, N - H⋯O and N - H⋯N hydrogen bonds involving all five non-coordinating water molecules, the cyanide N atoms and the NH2 groups of the Lpn ligands, forming a three-dimensional framework.

Original languageEnglish
Pages (from-to)392-397
Number of pages6
JournalActa Crystallographica Section E: Structure Reports Online
Volume71
Issue number4
DOIs
Publication statusPublished - 1 Apr 2015

Keywords

  • (R)-propane-1,2-diamine
  • Bimetallic
  • Chiral
  • Coordination polymers
  • Crystal structure
  • Cyanide-bridged
  • Hydrogen bonding
  • Three-dimensional framework
  • Two-dimensional network

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Materials Science(all)
  • Chemistry(all)

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