Synthesis, Characterization and Crystal Structures of 1,2,4‐Triazole based Schiff‐Bases and their Copper(I) Complexes

Abstract

AbstractThe reaction of of 4‐amino‐5‐ethyl‐2H‐1,2,4‐triazole‐3(4H)‐thione (AETT, L) with furfural in methanol led to the corresponding Schiff‐Base (L1). The reaction of L1 with [Cu(PPh3)2]Cl in methanol gave to the neutral compound [(L1)Cu(PPh3)2Cl] (1). By recrystallization of 1 from CH3CN the complex [(L1)Cu(PPh3)2Cl]·CH3CN (1a) was obtained. All compounds were characterized by infrared spectroscopy, elemental analyses as well as by X‐ray diffraction studies. Crystal data for L1 at −80 °C: space group $\rm P{\bar 1}$ with a = 788.4(1), b = 830.3(2), c = 928.8(2) pm, α = 84.53(1)°, β = 65.93(1)°, γ = 72.02(1)°, Z = 2, R1 = 0.0323; for 1 at −100 °C: space group $\rm P{\bar 1}$ with a = 1166.3(1), b = 1423.8(2), c = 1489.1(2) pm, α = 62.15(1)°, β = 72.04(1)°, γ = 88.82(1)°, Z = 2, R1 = 0.0338 and for 1a at −100 °C: space group P21/c with a = 1294.1(1), b = 1019.8(2), c = 3316.9(4) pm, β = 94.73(1)°, Z = 4, R1 = 0.0435.