Palladium(II) complexes namely [Pd(L_Me)₂(Cl)₂] (5), [Pd(L_Et)₂(Cl)₂] (6), [Pd(L_Bu)(Cl)₂] (7) and [Pd(L_Bz)(Cl)₂] (8) were synthesized as electrocatalysts towards CO₂ reduction into CO, H₂O acting as proton source in presence of TFA. These catalysts were prepared by substitution of benzonitrile from bis(benzonitrile)palladium(II)chloride with proligands; [HL_Me][OTf] (1), [HL_Et][I] (2), [HL_Bu][Br] (3) and [HL_Bz][Cl] (4) correspondingly. All the eight new compounds were successfully characterized with spectroscopic and single crystal X-ray diffraction techniques. It was found out that both steric and electronic properties of ligands concomitantly affected the catalytic properties of the catalysts. The activity of these catalysts decreases in the following order: 6 > 7 > 5 > 8. 6 displayed maximum TOF of 337 s⁻¹ and rate constant (k_cat) of 1870 M⁻¹s⁻¹ along with 73 % Faradaic efficiency to produce CO from CO₂ in the presence of trifluoracetic acid. However, the lowest over potential (η) of −340 mV was shown by 7. All the catalysts were robust with no major current fluctuations were observed during controlled potential electrolysis for more than 3600 s.

钯（II）配合物，即[Pd（L _Me）₂（Cl）₂ ]（5），[Pd（L _Et）₂（Cl）₂ ]（6），[Pd（L _Bu）（Cl）₂ ]（7）和[Pd（L _Bz）（Cl）₂ ]（8）合成为电催化剂，可在TFA存在下将CO ₂还原为CO，H ₂ O作为质子源。这些催化剂是通过用配位体取代双（苄腈）氯化钯（Ⅱ）中的苄腈而制得的。[HL _Me ] [OTf]（1），[HL_Et ] [I]（2），[HL _Bu ] [Br]（3）和[HL _Bz ] [Cl]（4）分别。八种新化合物均已通过光谱学和单晶X射线衍射技术成功表征。已发现，配体的空间和电子性质均同时影响催化剂的催化性质。这些催化剂的活性按以下顺序降低：6 > 7 > 5 > 8。6显示的最大TOF为337 s ^-1，速率常数（k _cat）为1870 M ^-1 s ^-1在三氟乙酸存在下从CO ₂生成CO的法拉第效率为73％。但是，最低的过电位（η）为-340 mV，如图7所示。所有的催化剂都是坚固的，在受控电势电解超过3600 s期间没有观察到较大的电流波动。