From Discrete Complexes to Metal-Organic Layered Materials: Remarkable Hydrogen Bonding Frameworks

Molecules. 2020 Mar 16;25(6):1353. doi: 10.3390/molecules25061353.

Abstract

A series of metal-organic coordination complexes based on alkaline-earth metal centers [Mg(II), Ca(II), and Ba(II)] and the ligand 5-aminoisophthalate (aip2-) revealed notable structural diversity, both in the materials' dimensionality and in their hydrogen bonding networks: [Mg(H2O)6]∙[Mg2(Haip)(H2O)10]∙(Haip)∙3(aip)∙10(H2O) (1) and [Mg(aip)(phen)(H2O)2]∙(H2O) (2) were isolated as discrete complexes (0D); [Ca(aip)(H2O)2]∙(H2O) (3), [Ca(aip)(phen)(H2O)2]∙(phen)∙(H2O) (4), and [Ba2(aip)2(phen)2(H2O)7]∙2(phen)∙2(H2O) (5) revealed metal-organic chain (1D) structures, while the [Ba(aip)(H2O)] (6) showed a metal-organic layered (2D) arrangement. Furthermore, most of these metal-organic coordination materials revealed interesting thermal stability properties, being stable at temperatures up to 450 °C.

Keywords: alkaline-earth metals; benzenedicarboxylate ligands; crystal structure; hydrogen bonding networks; metal–organic framework; structural diversity.

MeSH terms

  • Hydrogen Bonding
  • Metals / chemistry*
  • Models, Molecular
  • Organic Chemicals / chemistry*
  • Phthalic Acids / chemical synthesis
  • Phthalic Acids / chemistry
  • Spectroscopy, Fourier Transform Infrared
  • Temperature
  • Thermogravimetry
  • Vibration

Substances

  • Metals
  • Organic Chemicals
  • Phthalic Acids
  • 5-aminoisophthalic acid