Helicity Control in the Aggregation of Achiral Squaraine Dyes in Solution and Thin Films
作者:Andreas T. Rösch、Qirong Zhu、Jorn Robben、Francesco Tassinari、Stefan C. J. Meskers、Ron Naaman、Anja R. A. Palmans、E. W. Meijer
DOI:10.1002/chem.202002695
日期:2021.1.4
Squaraine dyes are well known for their strong absorption in the visible regime. Reports on chiral squaraine dyes are, however, scarce. To address this gap, we here report two novel chiral squaraine dyes and their achiral counterparts. The presented dyes are aggregated in solution and in thin films. A detailed chiroptical study shows that thin films formed by co‐assembling the chiral dye with its achiral
Elucidating the Supramolecular Copolymerization of N‐ and C‐Centered Benzene‐1,3,5‐Tricarboxamides: The Role of Parallel and Antiparallel Packing of Amide Groups in the Copolymer Microstructure
作者:Lafayette N. J. Windt、Zulema Fernández、Manuel Fernández‐Míguez、Félix Freire、Anja R. A. Palmans
DOI:10.1002/chem.202103691
日期:2022.1.3
microstructure. In contrast, in bulk, lamellar structures form and long-range order is lost. This is a result of the antiparallel H-bonds between N- and C-centered BTAs, which are less stable than the parallel H-bonds formed in the homopolymers.
在非极性溶液中共聚以N 和 C 为中心的 BTA,可得到具有块状微观结构的螺旋、氢键稳定的超分子共聚物。相反,在本体中,层状结构形成并且长程有序性丢失。这是 N 中心 BTA 和 C 中心 BTA 之间反平行氢键的结果,其稳定性低于均聚物中形成的平行氢键。
Circularlypolarized luminescent (CPL) materials with intense emission and high luminescence dissymmetry factor (glum) are highly desirable for their promising applications in communication technologies, nanotechnologies, innovative materials, etc. Motivated by benefits in supramolecular chemistry and aggregation-induced emission (AIE) materials for the development of advanced luminescent materials
Helical supramolecular polymerization of C<sub>3</sub>-symmetric amides and retroamides: on the origin of cooperativity and handedness
作者:Julia Buendía、Joaquín Calbo、Fátima García、Juan Aragó、Pedro M. Viruela、Enrique Ortí、Luis Sánchez
DOI:10.1039/c6cc02681h
日期:——
N-centred trisamides 1 form helical aggregates with the same handedness than CO-centred trisamides 2 following a cooperative polymerization mechanism.
N-中心三酰胺1形成螺旋聚集体,其手性与CO-中心三酰胺2相同,遵循协同聚合机制。
Temperature Control of Sequential Nucleation–Growth Mechanisms in Hierarchical Supramolecular Polymers
作者:Artem Osypenko、Emilie Moulin、Odile Gavat、Gad Fuks、Mounir Maaloum、Mark A. J. Koenis、Wybren Jan Buma、Nicolas Giuseppone
DOI:10.1002/chem.201902898
日期:2019.10.8
Upon cooling in solution, chiral triarylamine tris-amide unimers produce organogels by stacking into helical supramolecular polymers, which subsequently bundle into larger fibers. Interestingly, circular dichroism, vibrational circular dichroism, and AFM imaging of the chiral self-assemblies revealed that monocolumnar P-helical fibrils formed upon fast cooling, whereas bundled M-superhelical fibers