Two new compounds SrCu(PO)X·8HO (X = Cl and Br) are synthesized by a conventional hydrothermal method. SrCu(PO)Cl·8HO crystallizes in the tetragonal system with a space group of P422, while SrCu(PO)Br·8HO crystallizes in the space group P4/nmm, which are found to have a similar framework of layered structure, in which the crown-like {Cu(PO)X} building units connect to each other forming a 2D corrugated sheet with vacancies, while the Sr cations are located along the vacancies. The spin lattice of two compounds built by Cu ions shows a new type of corrugated square. Magnetic measurements confirmed that both SrCu(PO)X·8HO (X = Cl and Br) exhibit antiferromagnetic ordering at low temperatures. A fit of theoretical model shows exchange interaction J = -25.62 K for the Cl-analogue and J/k = -26.47 K for the Br-analogue.
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