A new metal-organic coordination nonlinear optical crystal, tri-allylthiourea zinc chloride (ZnCl 2 (AT) 3 , where AT is CH 2 =CHCH 2 NHCSNH 2 , abbreviated as ATZC), is reported. It was synthesized in water and recrystallized in ethanol. For the crystal structure, optical and thermal characterization were determined by elemental analyses, X-ray diffraction, infrared spectroscopy, differential scanning calorimeter, thermogravimetric analysis, and powder SHG efficiency meansurement. It belongs to the trigonal system, space group R3, with a=11.0498(4)Å, c= 16.0416(11)Å, z=3 and V=1696.24(15)Å 3. It exhibits powder SHG efficiency the same order as Urea crystal.

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