A Pair of CoII Supramolecular Isomers Based on Flexible Bis-Pyridyl-Bis-Amide and Angular Dicarboxylate Ligands

Molecules. 2020 Jan 3;25(1):201. doi: 10.3390/molecules25010201.

Abstract

Thermal reactions of cobalt(II) salts with flexible N,N'-bis(pyrid-3-ylmethyl)adipoamide (L) and angular 4,4'-sulfonyldibenzoic acid (H2SDA) in H2O and CH3OH afforded a pair of supramolecular isomers: [Co2(L)(SDA)2], 1, and [Co2(L)(SDA)2]⋅CH3OH⋅H2O, 2. The structure of complex 1 can be simplified as a one-dimensional (1D) looped chain with L ligands penetrating into the middles of squares, forming a new type of self-catenated net with the (42⋅54)(4)2(5)2 topology, whereas complex 2 displays a 2-fold interpenetrated 2D net with the rare (42⋅68⋅8⋅104)(4)2-2,6L1 topology. While both complexes 1 and 2 display antiferromagnetism with strong spin-orbital coupling, the antiferromagnetism of 2 is accompanied by a cross-over behavior and probably a spin canting phenomenon.

Keywords: coordination chemistry; coordination polymer; entanglement; supramolecular isomer.

MeSH terms

  • Amides / chemistry*
  • Carboxylic Acids / chemistry*
  • Cobalt / chemistry*
  • Coordination Complexes* / chemical synthesis
  • Coordination Complexes* / chemistry
  • Models, Chemical*
  • Molecular Structure

Substances

  • Amides
  • Carboxylic Acids
  • Coordination Complexes
  • Cobalt