@article{6f7c7d3ee3d24b0bbbd24c5d4d51f91b,
title = "Mechanical Manipulation of Archimedean Spirals of an Achiral Pyrazinacene for Chiral Assemblies",
abstract = "The fabrication of chiral assemblies from achiral molecules has attracted considerable interest since it provides insight into the structures of biological systems. It is also of general importance from the point-of-view of the various factors affecting self-assembly processes especially supramolecular chirality. Here, the dynamic interfacial assembly strategy is used to obtain unusual chiral assemblies from achiral linear nitrogen-rich acene derivatives, the pyrazinacenes. 1D supramolecular J-aggregate tapes of homogeneous width are coiled to form Archimedean spirals. Moreover, the dynamic assembly process further permits the controlled transformation of the Archimedean spirals into tightly coiled toroids and chiral concentric vortices. Grazing incidence X-ray diffraction study using synchrotron radiation reveals that J-aggregate monolayer deposited using the layer-by-layer technique forms a lamellar columnar oblique mesophase-like structure. Molecular packing in J-aggregates provides a significant channel for the occurrence of charge transport exhibiting carrier mobility of 0.045 cm2 V−1 s−1 due to enhanced electronic coupling. This study illustrates an intriguing approach for achieving chiral supramolecular assemblies from achiral molecules and also reveals the potential of the pyrazinacenes as charge transport materials for molecular electronics.",
keywords = "Archimedean spiral, charge transport, chirality, J-aggregates, pyrazinacenes, self-assembly, vortex",
author = "Pramita Mondal and Gouranga Manna and Tapas Kamilya and Mrinmay Das and Katsuhiko Ariga and Richards, {Gary J.} and Hill, {Jonathan P.} and Somobrata Acharya",
note = "Funding Information: The authors acknowledge SERB grant SERB-STAR grant #STR/2020/000053 and #CRG/2019/003907, India for financial support. PM acknowledges the INSPIRE fellowship scheme of DST, India for fellowship support. The authors acknowledge Technical Research Centre (TRC) of IACS for experimental support. Photon Factory, KEK, Tsukuba, Japan is gratefully acknowledged for the GIXD measurements using synchrotron radiation. This work was partly supported by World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan. The authors are also grateful for support from Japan Society for the Promotion of Science under KAKENHI Grant No. JP15K13684 (Linear acene proton conductors for molecular electronics), and KAKENHI Grant No. JP21K05044 (Extended Pyrazinacenes as a New Class of Near-Infrared Emissive Materials for Potential Bioimaging Applications). Funding Information: The authors acknowledge SERB grant SERB‐STAR grant #STR/2020/000053 and #CRG/2019/003907, India for financial support. PM acknowledges the INSPIRE fellowship scheme of DST, India for fellowship support. The authors acknowledge Technical Research Centre (TRC) of IACS for experimental support. Photon Factory, KEK, Tsukuba, Japan is gratefully acknowledged for the GIXD measurements using synchrotron radiation. This work was partly supported by World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan. The authors are also grateful for support from Japan Society for the Promotion of Science under KAKENHI Grant No. JP15K13684 (Linear acene proton conductors for molecular electronics), and KAKENHI Grant No. JP21K05044 (Extended Pyrazinacenes as a New Class of Near‐Infrared Emissive Materials for Potential Bioimaging Applications). Publisher Copyright: {\textcopyright} 2022 Wiley-VCH GmbH.",
year = "2022",
month = aug,
day = "3",
doi = "10.1002/admi.202200209",
language = "English",
volume = "9",
journal = "Advanced Materials Interfaces",
issn = "2196-7350",
publisher = "John Wiley and Sons Ltd",
number = "22",
}