Homochiral column structure of rac- and Λ-[MIII(tn) 3]P3O9 (M = Co, Cr; Tn = 1,3-diaminopropane; P3O9 = cyclotriphosphate(3-)) produced by multiple hydrogen bonds

Yukinari Sunatsuki, Sho Miyahara, Takayoshi Suzuki, Masaaki Kojima, Toshio Nakashima, Naohide Matsumoto, Frode Galsbøl

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The crystal structures of rac- and Λ-[MIII(tn) 3]P3O9·nH2O (M = Co, Cr; tn = 1,3-diaminopropane = trimethylenediamine; P3O9 = cyclotriphosphate(3-)) were determined by single-crystal X-ray analyses. In rac-[Co(tn)3]P3O9·7.3H2O, the [Co(tn)3]3+ cations with the same absolute configuration (Δ or Λ) and the P3O93- anions are alternately arrayed and connected by multiple NH⋯O hydrogen bonds to form a homochiral columnar structure. Adjacent homochiral columns with opposite chirality are connected by intercolumn hydrogen bonds to form a racemic pair of columns. The crystal structure of rac-[Cr(tn)3]P3O 9·7.5H2O is similar to that of the Co complex; however, there exist two types of racemic pairs of columns. In the crystal of Λ-[Co(tn)3]P3O9·2.5H 2O, a pair of columns consisting of alternately stacked Λ-[Co(tn)3]3+ cations and P3O 93- anions are linked by hydrogen bonds. Neighboring column pairs are further linked by hydrogen bonds to form a three-dimensional (3-D) sheet structure. The crystal structure of Λ-[Cr(tn) 3]P3O9·2.5H2O is isomorphous with the Co complex. The circular dichroism (CD) spectra of aqueous solutions of Λ-[M(tn)3]Br3 (M = Co, Cr) change when P 3O93- is added, and the changes were explained by ion pair formation through hydrogen bonds.

Original languageEnglish
Pages (from-to)2777-2784
Number of pages8
JournalNew Journal of Chemistry
Volume34
Issue number12
DOIs
Publication statusPublished - Dec 1 2010

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Materials Chemistry

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