The title complex [PdL₂]⁺·Cl^- (C₁₆H₁₈ClN₆O₂PdS 2, M_r=532.33), where HL is salicylidene thiosemicarbazone, has been synthesized from HL and palladium(Ⅱ) chloride in a mixture of dichloromethane and methanol. Crystal data: space group P2₁/c, a=0.70005(2) nm, b=1.05813(3) nm, c=2.70614(9) nm, β=93.036(1)°, V=2.0017(1) nm³, Z=4, D_c=1.766 Mg/m³, F(000)=1068, μ(MoKα)=1.295 mm^-1, R=0.0252, for 3457 observed reflections [I≥2σ(I)], wR=0.0593, GOF=1.020. The palladium(Ⅱ) atom in the complex [PdL₂]⁺ ion is coordinated with NOS₂, forming a distorted square arrangement. There are several intermolecular hydrogen bonds in the crystal. The one-dimensional chain structure was formed through the intermolecular hydrogen bonds N—H…Cl. The ν(C＝O) and ν(C＝N) bands display a shift to low frequencies in IR spectra of the complex. π-π^* charge transitions and d-π^* charge transitions were observed in their electronic spectra. The emission lines (λ ex=310 nm, n-π^* charge transitions) are influenced by the metal of the complex in fluorescence spectra.

Key words: crystal structure, salicylidene thiosemicarbazone, palladium complex, fluorescence character