Article
Chemistry, Multidisciplinary
Silke Wolf, Claus Feldmann
Summary: This article presents the synthesis and characterization of the pseudo-ternary tin(II) halide [BMPyr]2[SnCl4] by simply mixing the starting materials [BMPyr]Cl and SnCl2 at room temperature. The compound exhibits bright Sn(II)-based emission of deep-red light with a quantum yield of 88±3% after optimized synthesis. Characterization is performed using X-ray structure analysis, infrared, and fluorescence spectroscopy, and exemplary fluorescent thin films are achieved by solvent processing.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Silke Wolf, Claus Feldmann
Summary: The pseudo-ternary tin(ii) halide [BMPyr]2[SnCl4] can be easily synthesized by mixing [BMPyr]Cl and SnCl2 at room temperature without additional solvents. The compound exhibits bright deep-red emission (lambda max: 740 nm) with a high quantum yield (88 +/- 3%) after optimized synthesis. Characterization includes X-ray structure analysis, infrared and fluorescence spectroscopy. Exemplary fluorescent thin films are prepared through solvent processing.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Yueting Xu, Yanfei Zhao, Fengtao Zhang, Yuepeng Wang, Ruipeng Li, Junfeng Xiang, Zhimin Liu
Summary: The alcoholysis of propylene oxide using azolate ionic liquids at room temperature results in high yields and excellent selectivity due to the cooperative hydrogen-bonding interactions between the anion and methanol, as well as between the cation and PO.
CHEMICAL COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Chandrakant Mukesh, Shokat Sarmad, Ajaikumar Samikannu, Dariush Nikjoo, William Siljebo, Jyri-Pekka Mikkola
Summary: In this study, porous ionic liquids (ILs) utilizing microporous ZIF-8 moieties and functional ILs were prepared and thoroughly characterized. The prepared porous ILs exhibited low viscosity, high thermal stability, and reusability, and showed enhanced CO2 sorption capacity compared to neat ILs.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Polymer Science
Shinian Cheng, Zaneta Wojnarowska, Malgorzata Musial, Slawomir Kolodziej, Eric Drockenmuller, Marian Paluch
Summary: The study investigates the volume effects in a specific 1,2,3-triazolium-based poly(ionic liquid) at both the macro and nano scales. The experimental determination of a relatively large free volume (V-f) suggests it as the main factor controlling the superionic properties of the material. The analysis of specific volume and relaxation dynamics in terms of different models did not work for the studied system.
Article
Engineering, Chemical
Joachim Eichenlaub, Karol Baran, Maciej Smiechowski, Adam Kloskowski
Summary: Understanding the mechanism of carbon dioxide absorption in ionic liquids is crucial for their effective use in industrial flue gas treatment. This study calculated the Fractional Free Volume (FFV) of 73 ILs and used a quantitative structure-property relationship study to predict it, but the validation parameters were not satisfactory. In the second part, the importance of FFV in CO2 absorption was assessed by creating two models to predict Henry's Law Constant, which showed that incorporating FFV significantly improved the predictive accuracy of the models and allowed for the determination of subtle molecular interactions.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Chemistry, Physical
Jakov Slade, Dalibor Merunka, Ezequiel Huerta, Miroslav Peric
Summary: X-band electron paramagnetic resonance spectroscopy has been used to study the rotational diffusion of the stable nitroxide Cat-1 in a series of room-temperature ionic liquids. The rotation of Cat-1 is anisotropic, with a preferential axis along the NO moiety, and its rotational correlation time can be described by a power-law functionality with a singular temperature. The apparent activation energy of rotation shows non-Arrhenius behavior, and a structural transition from homogeneously globular to spongelike is observed when the alkyl chain length is four carbons. The rotation of Cat-1 is well described by the Cohen-Turnbull free volume theory in all ionic liquids measured.
JOURNAL OF PHYSICAL CHEMISTRY B
(2021)
Article
Polymer Science
Hilmi Syawal, Nur Khuzaimah Farhana, Zhi Ling Goh, Shahid Bashir, Norshahirah Mohamad Saidi, Elizer Rachagan, Subramaniam Ramesh, Ramesh Kasi
Summary: Novel redox electrolytes based on poly (ethylene oxide) (PEO) were synthesized using a binary ionic liquid system to reduce viscosity and improve conductivity. Different ratios of ionic liquids were added to enhance the efficiency of dye-sensitized solar cells. The combination of two alkyl side chain lengths led to improved short-circuit current density, open-circuit voltage, fill factor, and photovoltaic conversion efficiency.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Chemistry, Physical
Deyang Yu, Xiaona Pan, Joshua E. Bostwick, Curt J. Zanelotti, Linqin Mu, Ralph H. Colby, Feng Lin, Louis A. Madsen
Summary: Molecular ionic composites (MICs) are a new type of rigid gel electrolyte that combine fast ion transport with high thermal stability and mechanical strength. These MIC membranes demonstrate stable cycling performance over a wide temperature range, making them suitable for use as solid electrolytes in lithium metal batteries operating in various temperature environments.
ADVANCED ENERGY MATERIALS
(2021)
Article
Chemistry, Physical
Amrita Natekar, Ranjan Dey
Summary: In this study, a modification using the volume fraction HU approach was explored and tested on various mixtures at different temperatures. The results showed that the proposed approach outperformed the original HU method and other approaches in terms of agreement with experimental findings.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Chemistry, Organic
Bidyutjyoti Dutta, Nilakshi Dutta, Apurba Dutta, Montu Gogoi, Sanjay Mehra, Arvind Kumar, Kalyanjyoti Deori, Diganta Sarma
Summary: A bifunctional ionic liquid has been designed and explored as a catalyst for the synthesis of 2-phenylquinazolin-4(3H)-ones. The reaction can be completed in 3.5 minutes using microwave irradiation. In addition, the ionic liquid was used to assist the oxidation of benzyl alcohol to aldehyde without the need for metal catalysts, solvents, and bases. The multifunctionality of the ionic liquid was further confirmed in the synthesis of two Wnt pathway antagonists.
JOURNAL OF ORGANIC CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
Songyi Chen, Dazhe Xu, Xin Zhang, Xiehang Chen, Ye Liu, Tao Liang, Ziliang Yin, Sheng Jiang, Ke Yang, Jianrong Zeng, Hongbo Lou, Zhidan Zeng, Qiaoshi Zeng
Summary: Free volume is a key concept to describe various glass phenomena, but it is challenging to define and determine experimentally in glass structures. In this study, metallic glass is used as a model system to investigate the structural evolution of metallic glass with different amounts of free volume. The results show that free volume affects the compression behavior of metallic glasses, with higher amounts of free volume leading to lower density and bulk modulus. The compression process of metallic glasses under pressure is found to be elastic. These findings have implications for the structural models based on the concept of free volume.
Article
Chemistry, Physical
Christopher M. Burba, Kylie Feightner, Ming Liu, Ayman Hawari
Summary: The synthesis and properties of Solvate ionic liquids (SIL) depend on delicate interactions between cations, solvents, and anions. Fluorinated solvents have different charge distributions and impact SIL. This study found that partially substituting solvent TEG leads to a decrease in ionic conductivity and an increase in ionically-bound species. Additionally, the competition between FTEG and TEG for coordinating Li+ ions enhances conductivity.
Article
Chemistry, Multidisciplinary
Z. Elyasi, G. R. Najafi, J. Safaei Ghomi, M. A. Sharif
Summary: This study introduces a novel polymerized ionic liquid as a catalyst for the efficient synthesis of pharmaceutical scaffolds with broad structural diversity under environmentally-friendly conditions.
MATERIALS TODAY CHEMISTRY
(2022)
Article
Chemistry, Physical
Md Iqbal Hossain, G. J. Blanchard
Summary: Room temperature ionic liquids (RTILs) have unique properties, including the ability to support induced free charge density gradient. When diluted, RTILs form micelle-like structures and show compositional non-uniformity. In this study, we investigated the dilution of two imidazolium RTILs with polar aprotic solvents and found that the properties depend on the RTIL anion. Evidence of aggregated domains in the non-affected regions of RTILs was observed, and the domain size increased with increasing dilution.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Chemistry, Physical
Sumanta Paul, Anunay Samanta
ACS ENERGY LETTERS
(2020)
Article
Chemistry, Physical
Tasnim Ahmed, Apurba De, Sumanta Paul, Anunay Samanta
Summary: By employing a combination of techniques, this study reveals individual particle-level understanding of charge carrier recombination pathways and dynamics in Bi-doped CsPbBr3 nanocrystals. The results show the heterogeneity of the system in terms of photoluminescence brightness/ efficiency of the individual nanocrystals in doped samples, with bright, dim, and dark types identified. The weak photoluminescence of the doped systems is mainly attributed to an ultrafast trapping process that turns a majority of the Bi-doped nanocrystals into dark ones.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Navendu Mondal, Apurba De, Sudipta Seth, Tasnim Ahmed, Somnath Das, Sumanta Paul, Rajesh Kumar Gautam, Anunay Samanta
Summary: The recent emergence of metal halide perovskites as triplet sensitizers has opened up new possibilities in optoelectronics. Understanding the band-edge energetics of perovskite nanocrystals, characterizing excitons, and investigating sensitization mechanisms of long-lived triplets are crucial in this area. Modulating deactivation processes in sensitized triplets for photon upconversion or room-temperature phosphorescence is also explored.
ACS ENERGY LETTERS
(2021)
Article
Chemistry, Physical
Sk Saddam Hossain, Sneha Paul, Anunay Samanta
Summary: The study investigates how deep eutectic solvents (DESs) affect the structural stability and conformational dynamics of cytochrome c, with a particular focus on the influence of trimethylglycine (TMG) combined with ethylene glycol (EG) or glycerol (GL). Single-molecule-based fluorescence correlation spectroscopy (FCS) and ensemble-based biophysical methods were employed to analyze the protein's behavior in hydrated DESs. The results suggest that the interaction strengths between DES constituents and water molecules play a crucial role in determining the behavior of cytochrome c in DESs.
JOURNAL OF PHYSICAL CHEMISTRY B
(2021)
Article
Chemistry, Physical
Sumanta Paul, Tasnim Ahmed, Somnath Das, Anunay Samanta
Summary: This study demonstrates the direct synthesis of highly luminescent perovskite nanocrystals with PLQY as high as 80-99% by selecting appropriate halide precursors and optimizing the Pb:X precursor ratio. Time-resolved PL and ultrafast pump-probe studies reveal the impact of the Pb:X precursor ratio on carrier recombination processes. By using excess halide precursor, the carrier trapping effect that impairs PLQY can be effectively alleviated.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Rajesh Kumar Gautam, Somnath Das, Anunay Samanta
Summary: Studies have shown that cesium lead halide perovskite nanocrystals treated with sodium thiosulfate not only improve the photoluminescence quantum yield but also increase stability under different environmental stresses. This enhancement is achieved through the formation of Pb-S bonds between undercoordinated surface Pb and thiosulfate.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Multidisciplinary
Rajesh Kumar Gautam, Somnath Das, Anunay Samanta
Summary: The treatment of blue-emitting, cyan-emitting, and green-emitting perovskite nanocrystals improves their photoluminescence quantum yield and stability, making them suitable for various lighting and display applications.
Article
Chemistry, Physical
Somnath Das, Anunay Samanta
Summary: The study presents a generic protocol for direct synthesis of iodide-based lead halide perovskite nanocrystals with extraordinary characteristics using 1,3-diiodo-5,5-dimethylhydantoin as iodide precursor. The synthesized nanocrystals exhibit phase purity, high photoluminescence quantum yield, and stability, which could be beneficial for efficient perovskite-based solar photovoltaic devices in the red-NIR region.
ACS ENERGY LETTERS
(2021)
Article
Chemistry, Physical
Tasnim Ahmed, Sumanta Paul, Anunay Samanta
Summary: Lead halide perovskites are crucial for solar photovoltaic applications, and understanding the hole transfer process is essential for their performance. This study investigates the influence of hole transfer from FAPbBr(3) to phenothiazine on the photoluminescence blinking dynamics of nanocrystals. The results reveal the heterogeneous nature of the hole transfer dynamics and the formation of a short-lived charge-separated state.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Sumanta Paul, Anunay Samanta
Summary: In this study, stable and highly luminescent CsPbI3 nanocrystals were successfully obtained by modifying the conventional hot-injection method with NH4I as an additional precursor. The excellent characteristics of these nanocrystals, such as the suppression of photoluminescence blinking, could be attributed to the replacement of surface Cs+ with NH4+ ions. These CsPbI3 nanocrystals show great potential for optoelectronic and solar photovoltaic applications.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Sumanta Paul, Gautam Kishore, Anunay Samanta
Summary: In this study, the photoluminescence blinking phenomenon of quantum confined CsPbBr3 nanocrystals with different sizes was investigated. The recombination pathways and dynamics of the photogenerated charge carriers were analyzed in both immobilized and fluid conditions. The results showed that smaller nanocrystals had a higher carrier trapping rate and a more difficult detrapping process. These findings provide valuable information for designing photoluminescent samples of CsPbBr3 nanocrystals for optoelectronic applications.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Nanoscience & Nanotechnology
Somnath Das, Modasser Hossain, Anunay Samanta
Summary: A direct method of obtaining CsPbCl3 NCs with exceptional characteristics is reported using diphenylphosphoryl chloride as an efficient chloride precursor and preventing protonation of the amine ligand. High PLQY and remarkable stability of these NCs are attributed to the strong L-type coordination of the unprotonated amine ligand with Pb2+ on the surface. Using these NCs as emitting materials, a high-performance violet LED with ultrapure PL at 410 nm and narrow bandwidth is achieved.
ACS APPLIED NANO MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Ramavath Babu, Anunay Samanta, Seelam Prasanthkumar, Lakshminarayana Polavarapu
Summary: In this study, hybrid Mn(II) halide (Cl, Br, and I) single crystals with near-unity photoluminescence quantum yield (PLQY) were prepared using the organic cation DMAPH and controlled Zn2+ doping/alloying. The PLQY of these crystals was stable for more than 60 days and could be improved by selective organic cations and doping/alloying strategies.
ACS MATERIALS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Somnath Das, Anunay Samanta
Summary: Direct synthesis of high-quality APbCl(3) and APbBr(3) nanocrystals has been achieved using the chloro- and bromo-analog of DIDMH, providing a generic approach for the synthesis of all APbX(3) nanocrystals. These nanocrystals exhibit excellent stability, high photoluminescence quantum yields, and remarkable performance under various conditions.
Article
Chemistry, Physical
Sumanta Paul, Anunay Samanta
Summary: By adding NH4I as a precursor, stable and highly luminescent CsPbI3 nanocrystals were successfully synthesized in this study, with significantly suppressed PL blinking. These CsPbI3 nanocrystals can be used as promising materials for single-photon emitters and optoelectronic and solar photovoltaic applications.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)