Susobhan Das
@chimpoly.ulb.be
Postdoctoral Research Associate, Chemistry
Université libre de Bruxelles ( ULB ), Belgium
EDUCATION
Doctorate in Chemistry
RESEARCH, TEACHING, or OTHER INTERESTS
Organic Chemistry, Materials Science, Pharmaceutical Science, Materials Chemistry
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Guillaume Schweicher, Susobhan Das, Roland Resel, and Yves Geerts
International Union of Crystallography (IUCr)
Historically, knowledge of the molecular packing within the crystal structures of organic semiconductors has been instrumental in understanding their solid-state electronic properties. Nowadays, crystal structures are thus becoming increasingly important for enabling engineering properties, understanding polymorphism in bulk and in thin films, exploring dynamics and elucidating phase-transition mechanisms. This review article introduces the most salient and recent results of the field.
Amit Mondal, Biswajit Bhattacharya, Hongbo Chen, Somayeh Khazaei, Susobhan Das, Surojit Bhunia, Somnath Dey, Rituparno Chowdhury, Manjima Bhattacharya, Alexandre Tkatchenko,et al.
Elsevier BV
Susobhan Das, Luca Catalano, and Yves Geerts
Wiley
AbstractDynamic molecular crystals combining multiple and finely tunable functionalities are attracting and an increasing attention due to their potential applications in a broad range of fields as efficient energy transducers and stimuli‐responsive materials. In this context, a multicomponent organic salt, piperazinium trifluoroacetate (PZTFA), endowed with an unusual multidimensional responsive landscape is reported. Crystals of the salt undergo smooth plastic deformation under mechanical stress and thermo‐induced jumping. Furthermore, via controlled crystal bending and release of trifluoroacetic acid from the lattice, which is anticipated from the design of the material, both the mechanical response and the thermoresponsive behavior are efficiently tuned while partially preserving the crystallinity of the system. In particular, mechanical deformation hampers guest release and hence the macroscopic jumping effect, while trifluoroacetic acid release stiffens the crystals. These complex adaptive responses establish a new crystal engineering strategy to gain further control over dynamic organic crystals.
Poonam Deka, Susobhan Das, Parishmita Sarma, Kalyan J. Kalita, Ratheesh K. Vijayaraghavan, C. Malla Reddy, and Ranjit Thakuria
American Chemical Society (ACS)
Dama Saren, Susobhan Das, Aparup Paul, Sharad S. Tat, Manas Kumar Santra, Tapan Kumar Si, Horst Puschmann, and Subal Chandra Manna
Elsevier BV
Rakesh Biswas, Susobhan Das, Horst Puschmann, and Supratim Banerjee
Wiley
AbstractAmphiphilic di‐cationic fumaronitrile derivatives with peripheral n‐alkyl chains formed organic nanoparticles (NPs) through self‐assembly in aqueous media. The NPs exhibited enhanced luminescence in both steady‐state and delayed mode in comparison to their molecularly dissolved state. Due to the presence of the multivalent array of positive charges on their surface, they were found to bind heparin, a bio‐polyanion which is routinely employed during surgery as an anticoagulant. The electrostatically driven co‐assemblies resulted in a significant enhancement in the steady‐state and delayed luminescence of the NPs. This provided a highly sensitive detection of the polyanion in aqueous buffer as well as in highly competitive serum and plasma media. Furthermore, and most notably, the heparin based co‐assemblies were found to act as efficient donors exhibiting fluorescence resonance energy transfer (FRET) to acceptor dyes with the energy transfer efficiency reaching up to 88%.
Trishna Rajbongshi, Kashyap Kumar Sarmah, Susobhan Das, Poonam Deka, Arijit Saha, Binoy K. Saha, Horst Puschmann, C. Malla Reddy, and Ranjit Thakuria
Royal Society of Chemistry (RSC)
A unique set of carbamazepine (CBZ) non-stoichiometric cocrystal hydrates with 34/35DHBA have been synthesized which are facilitated by their isostructural nature with the CBZ dihydrate, resulting in coformer–water exchange (molecular alloy).
Ranita Samanta, Susobhan Das, Saikat Mondal, Tamador Alkhidir, Sharmarke Mohamed, Satyaprasad P. Senanayak, and C. Malla Reddy
Royal Society of Chemistry (RSC)
Comparing flexible electronic devices containing either elastic or brittle organic semiconducting crystals led to superior stress tolerance and retention of the field-effect mobility (μFET) for devices containing elastically bendable organic crystals.
Kalipada Koner, Susobhan Das, Shibani Mohata, Nghia Tuan Duong, Yusuke Nishiyama, Sharath Kandambeth, Suvendu Karak, C. Malla Reddy, and Rahul Banerjee
American Chemical Society (ACS)
Covalent organic nanotubes (CONTs) are one-dimensional porous frameworks constructed from organic building blocks via dynamic covalent chemistry. CONTs are synthesized as insoluble powder that restricts their potential applications. The judicious selection of 2,2'-bipyridine-5,5'-dicarbaldehyde and tetraaminotriptycene as building blocks for TAT-BPy CONTs has led to constructing flexible yet robust and self-standing fabric up to 3 μm thickness. The TAT-BPy CONTs and TAT-BPy CONT fabric have been characterized by solid-state one-dimensional (1D) 13C CP-MAS, two-dimensional (2D) 13C-1H correlation NMR, 2D 1H-1H DQ-SQ NMR, and 2D 14N-1H correlation NMR spectroscopy. The mechanism of fabric formation has been established by using high-resolution transmission electron microscopy and scanning electron microscopy techniques. The as-synthesized viscoelastic TAT-BPy CONT fabric exhibits high mechanical strength with a reduced modulus (Er) of 8 (±3) GPa and hardness (H) of 0.6 (±0.3) GPa. Interestingly, the viscoelastic fabric shows time-dependent elastic depth recovery up to 50-70%.
Susobhan Das, Subhankar Saha, Mrinmay Sahu, Amit Mondal, and C. Malla Reddy
Wiley
AbstractAlthough, dynamic crystals are attractive for use in many technologies, molecular level mechanisms of various solid‐state dynamic processes and their interdependence, remain poorly understood. Here, we report a rare example of a dynamic crystal (1), involving a heavy transition metal, rhenium, with an initial two‐face elasticity (within ≈1 % strain), followed by elasto‐plastic deformation, at room temperature. Further, these crystals transform to a rotator (plastic) crystal phase at ≈105 °C, displaying exceptional malleability. Qualitative and quantitative mechanical tests, X‐ray diffraction, μ‐Raman and polarized light microscopy experiments reveal that the elasto‐plastic deformation involves both partial molecular rotations and slip, while malleability in the rotator phase is facilitated by reorientational motions and increased symmetry (slip planes). Our work, connecting the plastically bendable (1D or 2D) crystals with the rotator phases (3D), is important for designing multi‐functional dynamic crystals.
Venkatesh Gude, Priyanka S. Choubey, Susobhan Das, Shivakiran Bhaktha B. N., C. Malla Reddy, and Kumar Biradha
Royal Society of Chemistry (RSC)
Single crystals of monoaromatic compounds exhibiting both mechanical softness and optical properties have attracted significant scientific interest in recent years, but they are very scarce.
Surojit Bhunia, Shubham Chandel, Sumanta Kumar Karan, Somnath Dey, Akash Tiwari, Susobhan Das, Nishkarsh Kumar, Rituparno Chowdhury, Saikat Mondal, Ishita Ghosh,et al.
American Association for the Advancement of Science (AAAS)
Autonomous self-healing The ability to autonomously restore shape or self-heal are useful properties that have been incorporated into a range of materials, including metals and polymers. Bhunia et al. found that both of these abilities could be achieved in piezoelectric molecular crystals, specifically bipyrazole organic crystals. When the crystals are fractured, they develop charged surfaces that attract each other, drawing the two faces together to enable self-repair as long as they remain within a critical distance of each other. The effect can also be seen in other noncentrosymmetric piezoelectric crystals. Science , abg3886, this issue p. 321
Susobhan Das, Amit Mondal, and C. Malla Reddy
Royal Society of Chemistry (RSC)
This review highlights the exceptional properties of plastic crystals, their expanding scope in materials sciences and plenty of opportunities for designing new mechanically soft functional crystals.
Amit Mondal, Biswajit Bhattacharya, Susobhan Das, Surojit Bhunia, Rituparno Chowdhury, Somnath Dey, and C. Malla Reddy
Wiley
AbstractDuctility is a common phenomenon in many metals but is difficult to achieve in molecular crystals. Organic crystals bend plastically on one or two face‐specific directions but fracture when stressed in any other arbitrary directions. An exceptional metal‐like ductility and malleability in the isomorphous crystals of two globular molecules, BH3NMe3 and BF3NMe3, is reported, with characteristic tensile stretching, compression, twisting, and thinning. The mechanically deformed samples, which transition to lower symmetry phases, retain good long‐range order amenable to structure determination by single‐crystal X‐ray diffraction. Molecules in these high‐symmetry crystals interact through electrostatic forces (B−−N+) to form columnar structures with multiple slip planes and weak dispersive forces between columns. On the other hand, the limited number of facile slip planes and strong dihydrogen bonding in BH3NHMe2 negates ductility. Our study has implications for the design of soft ferroelectrics, solid electrolytes, barocalorics, and soft robotics.
Biswajit Bhattacharya, Susobhan Das, Garima Lal, Saundray Raj Soni, Animesh Ghosh, C. Malla Reddy, and Soumyajit Ghosh
Elsevier BV
Biswajit Bhattacharya, Amit Mondal, Saundray Raj Soni, Susobhan Das, Surojit Bhunia, K. Bal Raju, Animesh Ghosh, and C. Malla Reddy
Royal Society of Chemistry (RSC)
Dissolution properties and membrane permeability studies were conducted for four newly prepared multidrug salts of norfloxacin with four NSAIDs, diclofenac, diflunisal, mefenamic acid and indomethacin.