Figure 3.

Copper(II)/Irgacure-819 ratio effects on the photo-CuAAC reaction using 110 mM methyl-2azidoacetate and 1-dodecyne in DMF at 10 mW/cm² (405 nm filtered light). (a) Adding copper(II) above its threshold value does not influence the reaction kinetics. Similar kinetic behavior is observed when the concentration of photoinitiator is constant at 3 mM and copper(II) is increased from 7 mM to 15 mM (closed square and circle). The reaction rate of 25 mM of copper(II) and 15 mM of copper(II) at constant photoinitiator concentration at 7 mM is also the same (open square and circle). (b) Adding photoinitiator above its threshold value does not increase the reaction rate. The reaction rate of 3 mM Copper(II) with 3 and 7 mM of I-819 are identical (closed square and circle). The reaction rate of 7 mM Copper(II) with 7 and 15 mM of I-819 are also identical (open square and circle). (c) When both copper(II) and I-819 are increased in an equimolar ratio from 3 mM copper(II) and 3 mM I-819 (square) to 7mM copper(II) and 7 mM I-819 (circle) to 15 mM copper(II) and 15 mM I-819 (triangle), the reaction rate increases.