Halogen anion-induced formation of [(PdLX)2] (X = Cl−, Br−, I−) vs. [PdL2] (L = [6-MeO(O)CC6H4NHC(S)NP(S)(OiPr)2]−): Reversible photoinduced cis/trans isomerization of [PdL2]

Abstract

Reaction of the potassium salt of N-thiophosphorylated thiourea 6-MeO(O)CC₆H₄NHC(S)NHP(S)(OiPr)₂ (HL) with PdX₂ (X = Cl⁻, Br⁻, I⁻) leads to the dark red binuclear complexes [(PdLX)₂], while the same reaction with PdY₂ (Y = NO₃⁻, CN⁻, CH₃COO⁻) leads to the light red mononuclear complex [PdL₂]. [PdL₂] exhibits reversible photoinduced cis-isomerization upon irradiation at 365 or 450 nm, reverting back to the trans-isomer in darkness or upon irradiation at 546 nm.