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Coupled Cooperative Supramolecular Polymerization: A New Model Applied to the Competing Aggregation Pathways of an Amphiphilic aza‐BODIPY Dye into Spherical and Rod‐Like Aggregates
Author(s) -
Liu Yong,
Zhang Yongjie,
Fennel Franziska,
Wagner Wolfgang,
Würthner Frank,
Chen Yuanfang,
Chen Zhijian
Publication year - 2018
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201803336
Subject(s) - bodipy , cooperativity , supramolecular chemistry , amphiphile , polymerization , metastability , j aggregate , self assembly , chemistry , materials science , polymer chemistry , chemical engineering , chemical physics , polymer , organic chemistry , copolymer , molecule , fluorescence , biochemistry , physics , quantum mechanics , engineering
Based on our studies on biphasic self‐assembly behavior of an amphiphilic BF 2 ‐azadipyrromethene (aza‐BODIPY) dye 1 , a new analytical model to quantitatively describe the thermodynamic properties of the aggregation involving two competing supramolecular polymerization processes is proposed. In this model, the formation of the metastable as well as the thermodynamically stable aggregates was considered to follow a nucleated polymerization mechanism. The numerical calculation based on the new model gives insight into the formation of different species in such complicate aggregate systems. Moreover, the aggregation of the biphasic self‐assembly processes for dye 1 was investigated by concentration‐dependent UV/Vis spectroscopy. The experimental data were analyzed by using the new model to evaluate the thermodynamic parameters including aggregation constants, the size of nuclei, and the cooperativity the two types of aggregates.