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A new square-planar platinum(Ⅱ) complex,[Pt(Me3SiC=Cphen)(C≡CC6H4Cl-3)2] (1),was synthesized by using 3-trimethylsilylethynyl-1,10-phenanthroline (Me3SiC≡Cphen) and 3-chlorophenylacetylene ligands,and its structure was characterized by single-crystal X-ray crystallography.1 crystallizes in triclinic,space group P(1) with a =6.9524(5),b =12.7796(11),c =17.5846(10) (A),a =78.484(5),β =88.700(5),γ =75.600(6)°,V =1482.23(19) (A)3,Z =2,C33H24Cl2N2PtSi,Mr =742.62,Dc =1.664 g/cm3,F(000) =724,μ(MoKa) =4.979 mm-1,R =0.0369 and wR =0.0786.In 1,adjacent molecules along the a axis are stacked in a columnar structure through π…π interactions,and such neighboring columnar structures are connected with each other by C-H…π hydrogen bonds to form a 2D supramolecular network.1 exhibits reversible luminescence mechanochromic property with the luminescence red shift in a range of ca.146～ 182 nm.Extremely large red-shifts of luminescence spectra suggest that luminescent mechanochromic property of 1 is due to the formation of aggregate via Pt-Pt interaction during the mechanical grinding.Based on this property,a simple device was developed and used for rewritable data storage.