Article
Polymer Science
Amanda K. Pearce, Sam J. Parkinson, Irem Akar, Matthew J. Derry, Paul D. Topham, Robert T. Mathers, Vasilios G. Stavros, Rachel K. O'Reilly
Summary: Polymerization-induced self-assembly (PISA) is a versatile method for producing nanoparticles in situ. This work demonstrates the use of a maleimide-based fluorophore as a powerful probe to study PISA over time. The fluorophore exhibits diagnostic increases in fluorescence lifetime with the onset of self-assembly and the evolution of particle morphology. The maleimide-functionalized nanostructures can also be used as cell imaging agents.
Article
Chemistry, Multidisciplinary
Rui Zheng, Jia Yang, Muhetaerjiang Mamuti, Da-Yong Hou, Hong-Wei An, Yuliang Zhao, Hao Wang
Summary: This study designed peptide-cyanine conjugates that self-assemble into structures with controlled cyanine aggregation in cells, demonstrating distinct imaging or photothermal properties. By modifying functional molecules on in vivo self-assembled peptides, the desired biological applications were achieved.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Review
Chemistry, Multidisciplinary
Amrita Sikder, Saptarshi Chakraborty, Priya Rajdev, Pradip Dey, Suhrit Ghosh
Summary: Bioinspired self-assembly using amphiphiles with hydrophobic supramolecular-structure-directing-units has led to the creation of highly stable nanostructures, which are fundamentally different from traditional amphiphiles. The supramolecular assembly is primarily controlled by the specific molecular-recognition motif of the SSDU, enabling precise regulation of internal order and morphology. Additionally, SSDU-derived pi-amphiphiles have shown promise in producing temperature and redox-responsive supramolecular polymers with efficient functional group display and biological activity.
ACCOUNTS OF CHEMICAL RESEARCH
(2021)
Article
Chemistry, Multidisciplinary
Zhenfei Gao, Tiannan Wang, Zikun Rao, Hui Yan, Ran Zhang, Guosong Chen
Summary: Supra-amphiphilic compounds containing disaccharides and azobenzene ends were constructed via dynamic covalent bond. The slight structural difference of the disaccharides was found to significantly affect the self-assembled morphologies. Three kinds of azo-disaccharide supra-amphiphiles were found to assemble into different morphologies with only a difference in chemical structure. Molecular simulation revealed that the packing of molecules was influenced by the contribution from hydrogen bonds. This study highlights the importance of saccharide packing, particularly related hydrogen bonding, in determining the final morphology of assembled structures.
CHINESE CHEMICAL LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Jie Li, Jianyu Zhang, Jianxing Wang, Dong Wang, Yun Yan, Jianbin Huang, Ben Zhong Tang
Summary: Utilizing nonplanar conjugated molecules for self-assembly is challenging but important. In this study, the self-assembly process of a nonplanar conjugated molecule with aggregation-induced emission (ALE) feature was demonstrated, driven by amphiphiles. The superhigh aggregation-sensitive emission provided precise information about the self-assembly process. The arrangements of ALE-active molecules changed from disordered to well-organized forms by reducing the twisted configuration. The obtained vesicles showed superhigh thermal stability and promising light-harvesting applications.
Article
Chemistry, Multidisciplinary
Alexander Schulz, Frank Wuerthner
Summary: This study demonstrated a significant fluorescence enhancement for a weakly fluorescent merocyanine dye by co facially stacking it with other dyes in heterofolda-trimer architectures. This enhancement was explained by the rigidification of the emitting chromophore in the foldamer architecture and the presence of a non forbidden lowest exciton state in H-coupled heteroaggregates, suggesting a promising strategy for improved fluorophores inspired by nature's green fluorescent protein (GFP).
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Xianhui Chen, Yuanyuan Peng, Xiaobo Tao, Guangyan Du, Quan Li
Summary: A novel supra-amphiphilic metahogeIator with both hydrophilic and hydrophobic components was synthesized, forming gels in different solvents through intermolecular pi-pi interactions. The presence of specific functional groups allows the gel to respond to stimuli such as temperature, pH, mechanical force, and metal ions, showing high adaptability to the external environment. This work presents a promising approach to design metal-based supra-amphiphilic self-assembly building blocks for producing stimuli-responsive and adaptive materials.
NEW JOURNAL OF CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Lorenz Borsdorf, Lorena Herkert, Nils Baeumer, Llorenc Rubert, Bartolome Soberats, Peter A. Korevaar, Cole Bourque, Christos Gatsogiannis, Gustavo Fernandez
Summary: Solute-solvent interactions are crucial in various fields and have been recognized as an important factor in driving intermolecular association in aqueous media. However, the understanding of solute-solvent effects in complex self-assembly energy landscapes and pathway complexity is limited. This study unravels the role of solute-solvent interactions in controlling chain conformation effects and pathway selection in aqueous supramolecular polymerization. The results reveal previously underappreciated solvent-dependent chain conformation effects and their role in governing pathway complexity in aqueous media.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Applied
Ruslan Kashapov, Yuliya Razuvayeva, Albina Ziganshina, Syumbelya Amerhanova, Anastasiia Sapunova, Alexandra Voloshina, Vadim Salnikov, Lucia Zakharova
Summary: This study demonstrates the use of amphiphilic viologen calix[4]resorcinol for the spontaneous co-aggregation with sodium caseinate, resulting in the formation of functional nanoparticles. These nanoparticles can solubilize both hydrophobic and hydrophilic molecules without the use of organic solvents, and exhibit cytotoxic and penetrating properties.
FOOD HYDROCOLLOIDS
(2023)
Article
Chemistry, Organic
Gerardo Santiago-Sampedro, Andres Aguilar-Granda, Aaron Torres-Huerta, Marcos Flores-Alamo, Mauricio Maldonado-Dominguez, Braulio Rodriguez-Molina, Martin A. Iglesias-Arteaga
Summary: This work describes the synthesis and aggregation behavior of a dimeric bile acid derivative with a bridging phenylethynylphenylene fluorophore. The compound shows restricted conformational equilibrium, efficient fluorescence and medium responsiveness. The incorporation of the three components leads to the formation of nano- and micrometric spherical particles with aggregation-responsive fluorescence emission.
JOURNAL OF ORGANIC CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Naohiro Kameta, Masaki Kogiso
Summary: The study found that different regioisomeric dihydroxy naphthalenes can lead to the formation of nanotubes or nanofibers with different structures when complexed with pyridine-based amphiphiles, and the inner diameter is strongly correlated with the aggregation states. These findings are crucial for fine-tuning the inner diameters of supramolecular nanotubes and controlling the aggregation states of functional aromatic molecules.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Physical
Lukasz Baran, Konrad Dyk, Daniel Michael Kaminski, Marek Stankevic, Wojciech Rzysko, Dariusz Tarasewicz, Tomasz Zientarski
Summary: In this study, the formation of self-assembled structures of tetraphenyl derivatives with different substitutions was investigated using classical molecular dynamics and quantum calculations. The results indicate that certain functional groups have a significant impact on the self-assembly process, and these molecules can form various ordered phases.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Chemistry, Physical
Alexander Zika, Mohit Agarwal, Ralf Schweins, Franziska Groehn
Summary: Quadruple-switchable nanoscale assemblies are created by combining two types of water-soluble molecular photoswitches, allowing activation through irradiation with two different wavelengths.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Simon Budzak, Justina Jovaisaite, Chung-Yang Huang, Paulius Baronas, Kamile Tulaite, Saulius Jursenas, Denis Jacquemin, Stefan Hecht
Summary: N,N'-disubstituted indigos are photoswitchable molecules that can be controlled by red-light. By tuning the N-substituents, the thermal stability of the molecules can be independently adjusted, while maintaining advantageous red-shifted absorption spectra. Photophysical and computational studies in solvents of different polarities revealed the photoisomerization mechanism of the molecules and the influence of the N-substituents on their switching properties. These mechanistic insights provide guidance for designing molecules with broader applications.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Bohdan Andreiuk, Ilya O. Aparin, Andreas Reisch, Andrey S. Klymchenko
Summary: Bulky hydrophobic counterions can insulate ionic dyes against aggregation-caused quenching, allowing preparation of highly fluorescent dye-loaded nanoparticles. These hydrophobic anions control dye communication and enhance dye encapsulation, showing promise for preparing bright and non-toxic fluorescent nanomaterials.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Nithiyanandan Krishnan, Devanathan Perumal, Siriki Atchimnaidu, Kaloor S. Harikrishnan, Murali Golla, Nilima Manoj Kumar, Jemshiya Kalathil, Jithu Krishna, Dileep K. Vijayan, Reji Varghese
CHEMISTRY-A EUROPEAN JOURNAL
(2020)
Review
Chemistry, Multidisciplinary
Vakayil K. Praveen, Balaraman Vedhanarayanan, Arindam Mal, Rakesh K. Mishra, Ayyappanpillai Ajayaghosh
ACCOUNTS OF CHEMICAL RESEARCH
(2020)
Article
Chemistry, Multidisciplinary
Arindam Mal, Samiyappan Vijayakumar, Rakesh K. Mishra, Jubi Jacob, Renjith S. Pillai, B. S. Dileep Kumar, Ayyappanpillai Ajayaghosh
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2020)
Article
Materials Science, Multidisciplinary
Gourab Das, Rajasekaran Thirumalai, Balaraman Vedhanarayanan, Vakayil K. Praveen, Ayyappanpillai Ajayaghosh
ADVANCED OPTICAL MATERIALS
(2020)
Article
Nanoscience & Nanotechnology
Pankaj B. Agarwal, Rishi Sharma, Dharmesh Mishra, Navneet Kumar Thakur, Ajay Agarwal, Ayyappanpillai Ajayaghosh
ACS APPLIED MATERIALS & INTERFACES
(2020)
Review
Chemistry, Multidisciplinary
Shine K. Albert, Murali Golla, Nthiyanandan Krishnan, Devanathan Perumal, Reji Varghese
ACCOUNTS OF CHEMICAL RESEARCH
(2020)
Article
Chemistry, Multidisciplinary
Anjali Nirmala, Indulekha Mukkatt, Sreejith Shankar, Ayyappanpillai Ajayaghosh
Summary: The study demonstrates a method to use a mixture of iron (II) chloride and bipyridine as a reversible thermochromic switch and logic operator, showing generality. It also proves the concept of an optically readable multi-state volatile memory with temperature as a precision input.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Nanoscience & Nanotechnology
Indulekha Mukkatt, Anjali Nirmala, Nayan Dev Madhavan, Sreejith Shankar, Biswapriya Deb, Ayyappanpillai Ajayaghosh
Summary: The study designed three tetraterpyridine ligands with variations in their core architecture to create spray-coated electrochromic assemblies of iron(II)-based metallosupramolecular polymer network films. These assemblies exhibited high coloration efficiencies and optical contrast, suitable for electrochromic devices. The ligand-structure induced differential metal coordination led to porosity and spectroelectrochemical diversification, enabling the creation of electrochromic patterns and images through a simple spray-coating technique.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Gourab Das, Sandeep Cherumukkil, Akhil Padmakumar, Vijay B. Banakar, Vakayil K. Praveen, Ayyappanpillai Ajayaghosh
Summary: In this study, the creation and control of distinct supramolecular energy landscapes for reversible control of excited-state emission processes were demonstrated through cascade energy transfer in chromophore assemblies. Enhanced near-infrared emission was achieved by manipulating morphology and excitation energy transfer with variable solvent composition and ultrasound stimulation.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
Sandeep Cherumukkil, Gourab Das, Ravi P. N. Tripathi, G. V. Pavan Kumar, Sunil Varughese, Ayyappanpillai Ajayaghosh
Summary: Bodipy-PE-2 self-assembly forms a layered photonic structure upon thermal annealing, exhibiting angle-dependent iridescence of green and pink with a luminescence shift from yellow to red. The properties are attributed to the micro- and nano-periodicity associated with the layered structure and the phase transformation due to annealing. The material shows active and passive waveguiding properties when excited with 532 and 633 nm laser sources.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Physical
C. K. Vipin, Atul Shukla, Kavya Rajeev, Monirul Hasan, Shih-Chun Lo, Ebinazar B. Namdas, Ayyappanpillai Ajayaghosh, K. N. Narayanan Unni
Summary: Pure white light emission was achieved by combining the exciplex emission with field-induced electromer emission. Electromer emission has significantly long-lived components, indicating possible utilization of triplet excitons in radiative recombination.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Materials Science, Multidisciplinary
Anjali K. Sajeev, Nishkarsh Agarwal, Anjaly Soman, Shilpi Gupta, Monica Katiyar, A. Ajayaghosh, K. N. Narayanan Unni
Summary: The study demonstrates the use of an external light extraction layer made of polydimethylsiloxane and zinc oxide nanoparticles to enhance the efficiency of OLEDs. The layer significantly improves light outcoupling, with white OLEDs showing the highest enhancement of 80%. Green OLEDs also exhibit substantial improvement, followed by red and blue OLEDs.
ORGANIC ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
Reethu Haridas, Jayadev Velore, Sourava Chandra Pradhan, Asarikal Vindhyasarumi, Karuvath Yoosaf, Suraj Soman, K. N. Narayanan Unni, Ayyappanpillai Ajayaghosh
Summary: Two new molecularly engineered D-pi-A sensitizers, YK 8 and YK 9, based on carbazole have been developed for indoor photovoltaic applications. The efficient power output achieved under various illumination conditions demonstrates the potential of these sensitizers for powering low-power sensors and actuators on the Internet of Things network. The study also explores the role of pi-spacer in recombination and device performance through extensive interfacial studies.
MATERIALS ADVANCES
(2021)
Article
Materials Science, Multidisciplinary
Sarah K. M. McGregor, Chinju Govind, Michael K. R. Wood, Atul Shukla, Hyunsoo Lim, Romain J. Lepage, Elizabeth H. Krenske, Narayanan K. N. Unni, Ayyappanpillai Ajayaghosh, Venugopal Karunakaran, Ebinazar B. Namdas, Shih-Chun Lo
Summary: A new solution-processable N-styrylcarbazole-linked tetraphenylethylene derivative with green-orange emission was synthesized and characterized, showing significant photoluminescence enhancement in neat-film. The excited-state dynamics and enhanced PLQYs in the solid state were attributed to the restriction of structural relaxations, not aggregation effects commonly associated with TPE materials.
ADVANCED PHOTONICS RESEARCH
(2021)
Article
Chemistry, Multidisciplinary
Samrat Ghosh, Sreejith Shankar, Divya Susan Philips, Ayyappanpillai Ajayaghosh
MATERIALS TODAY CHEMISTRY
(2020)