Color Response (CR) analysis [32] (Supplementary Data, Section4) of liposomes conjugated with 1–4 after 30 m in Zn2+solutionsindicates that liposomes conjugated with 1 demonstrated the mostsignificant color change (39.6% CR), followed by 2 (37.8% CR), 3(31.4% CR) and 4 (24.2% CR) (Fig. 1).