A novel coordination polymers [Cu2（ETU）6]SO4（1）（ETU=ethylidene thiourea） was synthesized under solvothermal conditions.The crystal structure of the polymer was determined by X-ray diffraction: trigonal,space group R3c（No.161）,a=1.275 09（8） nm,b=1.275 09（8） nm,c=3.574 7（7） nm,γ=120°,Z=6,CCDC Number: 605501.In the structure of the polymer,each metal ion Cu（Ⅰ） coordinates to three S atoms attached to the ring of ETU forming two triangular pinwheel-shape monovalent cations[Cu2（ETU）6]+, in one of which the counter-ion SO2-4 is located.The ions with contrary charge,[Cu2（ETU）6]+ and SO2-4,are held together via the N—H…O hydrogen-bonded interactions resulting in a three-dimensional supramolecular network.
