“…Many of the aforementioned single-block iodinated BEMs, named as "first generation ADWs" suffer from a structural constraint about how to realize an optimal trade-off between iodine and energy-carrier bonds [74]. This amounts to saying that, owing to a limited number of bonding sites in a single-block structure, the higher the number of -I bonds, the fewer are the sites available for energy-carrier groups, such as, for example, -NO 2 .…”