Cyclization Matters: Structure–Property Relationship in π‐Conjugated Donor–Acceptor Macrocycle Versus Its Linear Analogue

ABSTRACT Macrocyclic architectures are powerful platforms for tuning optoelectronic and host–guest properties through controlled structural modifications. In this work, a linear donor–acceptor (D–A) fluorophore (CFC‐M) and its macrocyclic analogue (CFC‐CD), both synthesized from carbazole and fluorenone units, were investigated to uncover how molecular engineering reshapes optical and supramolecular behavior. Both CFC‐M and CFC‐CD acted as hosts to form stable 1:1 complexes with C 60 , with CFC‐CD exhibiting a higher binding affinity towards C 60 , with a binding constant of 3.74 × 10 5 M −1 than CFC‐M (2.18 × 10 5 M −1 )..