A new trinuclear Cd (II) complex [Cd₃(L)₆(2,2-bipyridine)₃] [L =<em> N</em>-phenylsulfonyl-<em>L</em>-leucinato] has been synthesized and characterized by elemental analysis, IR and X-ray single crystal diffraction analysis. The results show that the complex belongs to the orthorhombic, space group<em> P</em>2₁2₁2₁ with<em> a</em> = 16.877(3) Å, <em>b</em><em> </em>= 22.875(5) Å, <em>c </em>= 29.495(6) Å, <em>α</em><em> </em>= <em>β </em>= <em>γ </em>= 90°, <em>V</em><em> </em>= 11387(4) ų, <em>Z</em><em> </em>= 4, <em>D_c</em>= 1.416 μg·m⁻³, <em>μ </em>= 0.737 mm⁻¹, <em>F</em><em> </em>(000) = 4992, and final <em>R</em>₁ = 0.0390, <em>ωR</em>₂ = 0.0989. The complex comprises two seven-coordinated Cd (II) atoms, with a N₂O₅ distorted pengonal bipyramidal coordination environment and a six-coordinated Cd (II) atom, with a N₂O₄ distorted octahedral coordination environment. The molecules form one dimensional chain structure by the interaction of bridged carboxylato groups, hydrogen bonds and p-p interaction of 2,2-bipyridine. The luminescent properties of the Cd (II) complex and <em>N</em>-Benzenesulphonyl-<em>L</em>-leucine in solid and in CH₃OH solution also have been investigated.