Synthesis and crystal structures of 3D supramolecular compounds: [M(4,4′-bipy)₂(H₂O)₄] · (4,4′-bipy)₂· (3,5-daba)₂· 8H₂O (M=Zn, Mn)

Abstract

Two new supramolecular compounds [M(4,4′-bipy)₂ (H₂O)₄]  · (4,4′-bipy)₂  · (3,5-daba)₂  · 8H₂O (M=Zn(1) or Mn(2), 4,4′-bipy  = 4,4′-bipyridine, 3,5-daba  = 3,5-diaminobenzoic acid anion) were synthesized and characterized by elemental analysis and X-ray crystal diffraction. In [M(4,4′-bipy)₂(H₂O)₄]²⁺, the M(II) is coordinated by two nitrogen atoms from two 4,4′-bipy molecules and four oxygen atoms from four waters to form an octahedral configuration. There exist uncoordinated 4,4′-bipy molecules, 3,5-diaminobenzolate counterions and water guests in the compounds. The 3D structures of the title supramolecular compounds are constructed by rich hydrogen bonds among [M(4,4′-bipy)₂(H₂O)₄]²⁺, uncoordinated 4,4′-bipy molecules, water molecules and 3,5-daba, containing a diverting hexa-member water ring.

Keywords:

• 4,4′-bipy; Water ring
• Hydrogen bonds
• Supramolecular compounds

Acknowledgements

We acknowledge financial support by Key Laboratory of Non-Ferrous Metal Material and New Processing Technology, Ministry of Education, P.R. China.