Complex {Mn (phen)2(H2O) [C8H 11O2(COO)]}·(ClO4)·H 2O with bicycle [2.2.1]hept-2-en-5,6-dicarboxylic acid [C 7H8(COOH)2], perchlorate manganese 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=1.022 08(12) nm, b = 1.241 49(14) nm, c=1.354 29(15) nm, α=112.724(9) °, β=91.173(6)°, γ=101.250(3)°, V=1.545 9(3) nm 3, Dc=1.553 g·cm-3, Z=2, F(000)=744. Final R1=0.042 2, wR2=0.101 5. GooF = 1.080, The crystal structure shows that the ca...