Anion effect on the construction of copper(II) coordination polymers with the twisted ligand bis(4-pyridylthio)methane

The reaction of CuSO4 · H2O with 4-bpytm [4-bpytm = bis(4-pyridylthio)methane] in EtOH afforded the complex [Cu(SO4)(4-bpytm)(H2O)3] · H2O (1 · H2O) while the reaction of 4-bpytm with Cu(NO3)2 · 3H2O in EtOH afforded the complex [Cu(NO3)2(4-bpytm)2] · H2O (2 · H2O). The reaction of 4-bpytm with Cu(NO3)2 · 3H2O in EtOH/dmf under microwave irradiation afforded the pseudo-polymorph [Cu(NO3)2(4-bpytm)2] · Solv (2 · Solv). Compound 1 · H2O forms helical chains while compounds 2 · H2O and 2 · Solv are 2D coordination polymers with a (4,4) topology based on rhombic grids in 2 · H2O and on a parquet motif in 2 · Solv. The 3D supramolecular organization through hydrogen bonding is analyzed for the three compounds and their thermal behaviour was also investigated.

Graphical abstractWe report the synthesis, crystal structures, thermal behaviour and analysis of the supramolecular association in one 1D and two 2D coordination polymers with the bis(4-pyridylthio)methane ligand. The 2D coordination polymers are pseudo-polymorphs, and one of them was obtained under microwave irradiation.Figure optionsDownload full-size imageDownload as PowerPoint slide