Citation:
Shi, W. ; Wei, R. ; Zhang, D. ; Meng, L. ; Xie, J. ; Cai, K. ; Zhao, D. *. Dual Cooperatively Grown J-Aggregates with Different Nucleus Size. Angew. Chem. Int. Ed. 2022, e202208635.
摘要:
A molecule featuring two distinct cooperatively grown J-aggregates is investigated. Interestingly, when cooling a hot monomer solution, the thermodynamically less stable J1 is exclusively formed even at a particularly slowed temperature dropping rate, which transforms to the more stable J2 at room temperature with very slow kinetics. This observation is ascribed to the differed nucleus sizes of J1 and J2 . During the cooling process, smaller J1 nuclei are formed first at a higher temperature, favored by the entropy effect. At intermediate temperatures, the elongation of J1 out-competes the nucleation of J2 . Then, below the elongation temperature of J2 , the formation of this thermodynamically stable aggregate is hindered kinetically, due to the depletion of monomer by the slow dissociation of J1 . Additional evidence proving the larger nucleus size of J2 is also identified with the varied-temperature spectral analyses and mathematic simulations.附注:
See also: 2022