One Complex{CdI(phen)(H2O)[C8H11O 2(COO)]}•H2O with bicycle[2.2.1]hept-2-en-5,6- dicarboxylic acid [C7H8(COOH)2], hydriodic acid and 1,10-phenanthroline (phen) has been synthesized by means of hydrothermal way and characterized. It crystallizes in the triclinic space group P1̄, with a=0.975 4(2) nm, b=0.9900(2) nm, c= 1.319 1(3) nm, α=89.146(4)°, β=69.800(3)°, γ=68.718(3)°, V=1.1050(4) nm3, Dc=1.914 g•cm-3, Z=2, F(000)=620, Final R 1=0.033 2, wR2=0.085 7, GooF=1.092. The crystal structure shows that the cadmium ion is coordinated with ...