A novel 2D coordination polymer based on a copper(II) tetramer with p-sulfonated thiacalix[4]arene

X-ray structural determination of the title complex shows it containing a phenoxy and sulfato-bridged Cu(II) tetramer coordinating to fully deprotonated p-sulfonated thiacalix[4]arene with its cavity occupied by a pyridinium cation and forming a 2D coordination polymer. Variable temperature susceptibility measurement reveals an antiferromagnetic coupling of four Cu(II) ions formed.