https://libjncir.jncasr.ac.in/xmlui/handle/10572/1541 2026-04-04T05:31:48Z 2026-04-04T05:31:48Z Kumar, Mohit Rao, K. Venkata George, Subi Jacob https://libjncir.jncasr.ac.in/xmlui/handle/10572/2523 2017-02-21T10:25:08Z 2014-01-01T00:00:00Z

Supramolecular charge transfer nanostructures Kumar, Mohit; Rao, K. Venkata; George, Subi Jacob Supramolecular organization of p-conjugated chromophores into well defined nanostructures has gained much attention due to their promising role as active components in organic electronics. Charge-transfer (CT) nanostructures, in which aromatic donor (D) and acceptor (A) molecules are alternately arranged, (mixed stack) have emerged recently as prospective candidates in this direction, because they provide inherent, uniform doping conducive for excellent conducting properties. The present perspective highlights the importance of charge transfer (CT) based non-covalent interactions, with emphasis on supramolecular design principles, for construction of various CT nano-architectures. The whole article is divided into three parts themed on the type of interactions used for obtaining CT assemblies. Through some of our recent results, we have attempted to highlight the latent potential of this nascent field. Furthermore, we have presented our perspectives on the major challenges in this field which is expected to broaden the scope of this subject. Restricted Access

2014-01-01T00:00:00Z Kumar, Mohit George, Subi Jacob https://libjncir.jncasr.ac.in/xmlui/handle/10572/2520 2017-02-21T10:25:11Z 2014-01-01T00:00:00Z

Novel Coronene-Naphthalene Dimide-Based Donor-Acceptor Pair for Tunable Charge-Transfer Nanostructures Kumar, Mohit; George, Subi Jacob Charge-transfer (CT) assemblies of aromatic donor (D) and acceptor (A) molecules have recently gained attention as a promising material for organic electronics and ferroelectrics. Two major factors which govern their functions are the strength of CT interaction and their supramolecular nanostructuring. Here we present coronene-naphthalenediimide (NDI)-based novel D-A pairs that form alternately stacked CT assemblies. Through systematic substitution of the NDI derivatives and studying their CT interactions with coronene, a clear understanding of the secondary forces responsible for controlling their association is gained. Finally, the use of CT-based supramolecular amphiphiles for their nanostructural engineering into ordered one-dimensional (1-D) assemblies is demonstrated. Restricted Access

2014-01-01T00:00:00Z Rao, K. Venkata Jain, Ankit George, Subi Jacob https://libjncir.jncasr.ac.in/xmlui/handle/10572/2521 2017-02-21T10:25:17Z 2014-01-01T00:00:00Z

Organic-inorganic light-harvesting scaffolds for luminescent hybrids Rao, K. Venkata; Jain, Ankit; George, Subi Jacob Luminescent light harvesting hybrid materials form a curious field not only because of their potential to deal with a variety of device related challenges, but also because they break new ground with the current trend of merging both organic and inorganic functionalities. We have chosen parent inorganic materials to illustrate how their design principles can have a huge impact on the science to come in this decades-old field. Though broadly the strategies used, such as encapsulation and co-assembly are based on similar concepts as used in previous eras, our emphasis lies on their application in new kinds of materials. We also concur with the fact that a better structure-property relationship can be arrived at in these materials and hence a common rationale can be established to investigate this field. Apart from this, we have given a perspective about the strategies that have been employed to bring about processability in these materials. Restricted Access

2014-01-01T00:00:00Z Kumar, Mohit George, Subi Jacob https://libjncir.jncasr.ac.in/xmlui/handle/10572/2519 2017-02-21T10:25:08Z 2014-01-01T00:00:00Z

Homotropic and heterotropic allosteric regulation of supramolecular chirality Kumar, Mohit; George, Subi Jacob Allosteric regulation, a key biological phenomenon, has been demonstrated for controlling the supramolecular handedness of an artificial self-assembled system. Supramolecular assembly of perylene bisimide (PBI) functionalized with dipicolylethylenediamine (DPA) binding sites demonstrates a bistable chiral on-off state by the non-covalent interaction of adenosine phosphate guests. Both homotropic and heterotropic allosteric control of the supramolecular chirality in this otherwise helically dormant assembly could be achieved by the binding of chiral and achiral phosphate guests, respectively, hitherto unknown in a biomimetic system. Through detailed spectroscopic and morphological investigations the role of supramolecular reorganization in such an effect has been clearly established. Restricted Access

2014-01-01T00:00:00Z