[Mn(en)~3]PdSe~2(Ⅰ) has been synthesized at 180℃ by solvothermal technique using K~2Se, MnCl~2, PdCl~2 as starting materials and ethylenediamine as solvent reacting for 7 days. Ⅰ shows an isolated structure containing a Zintl anion, [PdSe~2]^2^- and a complex cation, [Mn(en)~3]^2^+. The crystal structure has been determined by single crystal X-ray diffraction techniques. Ⅰ belongs to the orthorhombic, space group Pbcn with unit cell dimensions: a=1.1484(2), b=1.5057(3), c=0.93622(19)nm, V=1.6188(6)nm^3, Z=4.

Key words: TELLURIDE, MANGANESE COMPLEX, SELENIUM COMPOUNDS, PALLADIUM COMPOUNDS, CRYSTAL STRUCTURE, ETHANEDIAMINE