Article
Chemistry, Physical
Malik Abdul Rub, Dileep Kumar, Abdullah M. Asiri, Yousef G. Alghamdi
Summary: This article investigated the study of metal-amino acid complex and ninhydrin reaction in gemini micellar solution, showing that the gemini surfactant series had a more efficient influence on the rate constant than pure water and traditional surfactant systems. The activation parameters determined through Eyring's equation and different constants indicated lower values of activation enthalpy and large negative activation entropy in gemini micellar solutions compared to aqueous solutions.
Article
Chemistry, Physical
Abbul Bashar Khan, Ajaya Bhattarai, Zeeshan Haider Jaffari, Bidyut Saha, Dileep Kumar
Summary: The kinetics of the reaction between Ala and ninhydrin were studied using UV-vis spectroscopy, revealing different parameters and constants. The experimental results showed that the reaction followed first and fractional order rate paths at different concentrations.
COLLOID AND POLYMER SCIENCE
(2021)
Article
Environmental Sciences
Hanui Yang, Namgyu Kim, Donghee Park
Summary: In this study, the harmfulness of reduced-Cr(III) was identified through assessment of mobility and toxicity in nature. Pine bark was used to remove Cr(VI) from aqueous solution. The reduced-Cr(III) showed low mobility and was virtually non-toxic, and helpful for plant growth. Our findings demonstrate that Cr(VI) biosorption technology using pine bark is a groundbreaking technology for Cr(VI) detoxification.
Article
Chemistry, Multidisciplinary
Yulin Han, Anni Qin, Qian Zhang, Xue Zhang, Hui Qian, Shengming Ma
Summary: The Rh-catalyzed reaction allows for the efficient synthesis of cis-fused bicyclic products with excellent selectivity and tolerance towards synthetically useful functional groups. The proposed mechanism involves the rapid racemization of the allene moiety in the starting materials.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Jose A. Carmona, Patricia Rodriguez-Salamanca, Rosario Fernandez, Jose M. Lassaletta, Valentin Hornillos
Summary: An atroposelective Ir-catalyzed dynamic kinetic resolution (DKR) of 2-(quinolin-8-yl)benzaldehydes/1-naphthaldehydes is achieved by transfer hydrogenative coupling of allyl acetate. The reaction leads to the installation of central and axial chirality, with high diastereoselectivities and excellent enantioselectivities when ortho-cyclometalated iridium-DM-BINAP is used as the catalyst. The racemization of the substrates is facilitated through a designed transient Lewis acid-base interaction between the quinoline nitrogen atom and the aldehyde carbonyl group.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Sara L. Younas, Jan Streuff
Summary: Through kinetic analysis, it was found that the formation of catalyst and substrate reservoirs is crucial in the titanium(III)-catalyzed ketone-nitrile coupling reaction. A kinetic model was established to reflect the influence of ZnCl2 and Et3N byproducts, as well as the hydrochloride additive, in the reaction. Additionally, a hidden autocatalytic cycle in the acceleration phase of Cp2TiCl2 -catalyzed reaction may change the rate-determining step over time.
Article
Spectroscopy
Changsheng Gan, Rong Cheng, Kunliang Cai, Xiaonan Wang, Chenkun Xie, Tiantian Xu, Chuanxun Yuan
Summary: The interactions between calf thymus DNA and a series of glucose-based cationic gemini surfactants with different spacer length were studied. The results showed that all the surfactants could efficiently interact with DNA, causing changes in its absorption intensity and conformation. Surfactant 1c exhibited the most significant effect, compacting the DNA molecules to a smaller size. These findings shed light on the potential applications of cationic gemini surfactants in gene delivery.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Chemistry, Physical
Weiguang Yang, Yupeng Cao, Hongbin Ju, Yakui Wang, Yajie Jiang, Tao Geng
Summary: Novel amide Gemini surfactants with different hydrophobic chain lengths were synthesized and their surface properties were studied. The aggregation behavior in aqueous medium was analyzed using surface tension and negative staining TEM methods, showing good antistatic and antibacterial properties.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Engineering, Chemical
Zhen Wen, Peiwen Xiao, Pingmei Wang, Xue Han, Jule Ma, Shuangliang Zhao
Summary: This study systematically explores the influence of alkylbenzene sulfonate Gemini surfactants on the interfacial properties of dodecane/water systems using a dissipative particle dynamics simulation. It is found that increasing the hydrophobic chain length and spacer length can decrease the critical micelle concentration, induce nano-mixing phenomenon, and transform the system from a lamellar interface state to a micelle state.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Anton Ashuiev, Anna Giorgia Nobile, David Trummer, Daniel Klose, Sergey Guda, Olga V. Safonova, Christophe Coperet, Alexander Guda, Gunnar Jeschke
Summary: This study investigates the electronic structure of well-defined silica-supported Cr(III) alkyls using a combination of surface organometallic chemistry, EPR spectroscopy, and machine learning-supported XAS studies. Results show the presence of different surface species in high and low-spin states, associated with different coordination environments. The low-spin Cr(III) sites are shown to participate in ethylene polymerization, suggesting their potential involvement in the Phillips catalyst.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Hao Zhang, Xian He, Xiang-Ai Yuan, Shouyun Yu
Summary: Expanding the discovery of biologically or pharmacologically active molecules can be achieved by transforming chemical space into three-dimensional space through stereospecific reactions. This study focuses on alkene subunits as ubiquitous structural motifs and inexpensive starting points for this purpose. A kinetic resolution method enabled by photoexcited chiral copper complex-mediated alkene E -* Z isomerization was disclosed, which allowed for the enantiodivergent synthesis of 2-cinnamylpyrrolines. Mechanistic experiments and DFT calculations revealed the reasons for the observed kinetic resolution efficiency, which is due to the different association abilities between two enantiomers and the chiral copper complex in the ground state (thermodynamics) and the different overall sensitization rates of the substrate-catalyst complex in the excited state (kinetics). This revitalized protocol of kinetic resolution shows wide functional group compatibility and enables the exploration of three-dimensional chemical space, thereby providing an advanced and complementary method for stereochemistry control in triplet-state photoreactions.
Article
Engineering, Chemical
Jule Ma, Peiwen Xiao, Pingmei Wang, Xue Han, Jianhui Luo, Ruifang Shi, Xuan Wang, Xianyu Song, Shuangliang Zhao
Summary: This study uses molecular dynamics simulations to investigate how Gemini surfactants with pyrenyl groups affect the interfacial properties and molecular motion at oil/water interfaces. The results reveal that the pyrenyl groups tend to align vertically due to pi-pi stacking interactions, and a synergistic effect between pi-pi interactions and steric hindrance influences the coalescence of liquid droplets.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Florian Reichenauer, Cui Wang, Christoph Forster, Pit Boden, Naz Ugur, Ricardo Baez-Cruz, Jens Kalmbach, Luca M. Carrella, Eva Rentschler, Charusheela Ramanan, Gereon Niedner-Schatteburg, Markus Gerhards, Michael Seitz, Ute Resch-Genger, Katja Heinze
Summary: This study unveils a novel highly luminescent spin-flip emitter with a quantum chemically predicted blue-shifted luminescence, featuring high excited state energy and quantum yield. It shows potential applications in technologies such as photophysics and photochemistry, surpassing classical precious metal charge transfer complexes in optical sensing and photo(redox) catalysis.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Applied
Yongchen Cai, Hujun Xu, Peng Ling
Summary: This study investigated the properties of amide Gemini surfactants (DLP-12, DLP-14, and DLP-16). The results showed that these surfactants exhibit good wettability and solubility, with a decrease in these properties as the hydrophobic chain length increases. The critical micelle concentrations (CMC) measured by two different methods showed a decreasing trend with increasing hydrophobic chain length. The solubilization capacities in toluene improved with increasing chain length, while the surfactants demonstrated good thermal stability with high decomposition temperatures.
TENSIDE SURFACTANTS DETERGENTS
(2023)
Article
Chemistry, Organic
Yu Jeong Jang, Hyeju An, Seunghee Choi, Jayeon Hong, Seung Hyun Lee, Kwang-Hyun Ahn, Youngmin You, Eun Joo Kang
Summary: This study investigates the green-light-driven Fe-III(btz)(3) photocatalysis for the radical cationic [4+2] cycloaddition of terminal styrenes and nucleophilic dienes, resulting in the synthesis of multisubstituted cyclohexenes and structurally complex biorelevant cyclohexenes. The Fe-MIC complex forms a ligand-to-metal charge-transfer transition state with high excited-state reduction potentials, enabling selective oxidation of terminal styrene derivatives.
Article
Engineering, Chemical
Md. Anamul Hoque, Shamim Mahbub, Md. Tuhinur R. Joy, Malik Abdul Rub, Shahed Rana, Dileep Kumar, Yousef G. Alghamdi, Abdullah M. Asiri, Mohammed Abdullah Khan
Summary: The micellization behavior of CTAB and BSA mixture in different diols media was studied. The critical micelle concentration (cmc) values of the mixture decreased with increasing temperature and followed the order: cmc(1,5-PD)>cmc(1,2-PrD)>cmc(2,3-BD). The degree of micelle ionization (a) increased with carbon chain length and temperature. The thermodynamic parameters and the contribution of the solvent were also evaluated.
CHEMICAL ENGINEERING COMMUNICATIONS
(2023)
Article
Engineering, Chemical
Arnop Dutta, Md Tuhinur R. Joy, Sk. Md. Ali Ahsan, Mansour K. Gatasheh, Dileep Kumar, Malik Abdul Rub, Md. Anamul Hoque, Mohammad Majibur Rahman, Nasrul Hoda, D. M. Shafiqul Islam
Summary: The aggregation behavior of the mixture of cetyltrimethylammonium chloride (CTAC) and moxifloxacin hydrochloride (MFH) in aqueous and alcoholic media was studied. The critical micelle concentration (CMC) and counter ion binding (beta) of the CTAC + MFH mixture were evaluated. The CMC values were dependent on the composition of alcohols and temperature, increasing with temperature. The micellization of the CTAC + MFH mixed system was delayed in alcoholic media. The association of CTAC + MFH mixture exhibited hydrophobic, ion-dipole, and electrostatic interactions.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Biochemistry & Molecular Biology
Md. Anamul Hoque, Mohammad Idrish Ali, Malik Abdul Rub, Marzia Rahman, Shahed Rana, Mohammad Majibur Rahman, Dileep Kumar, Naved Azum, Abdullah M. Asiri, Mohammed Abdullah Khan
Summary: In this study, the association behavior of bovine serum albumin (BSA) and cetyl-trimethylammonium bromide (CTAB) was investigated using the conductivity method. The association phenomenon was detected by changes in conductivity and various physico-chemical properties. The interaction between BSA and CTAB was influenced by temperature and hydration extent. The binding interactions were believed to involve H-bonding, ion-dipole, and hydrophobic interactions.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Chemistry, Physical
Sk Mehebub Rahaman, Madhuparna Chakraborty, Trishna Mandal, Sandip Kundu, Subhendu Dhibar, Dileep Kumar, Samia M. Ibrahim, Manab Chakravarty, Bidyut Saha
Summary: This study investigates the growth process of lanthanum carbonate nanorods in W/O microemulsions. The initial nucleation dominant growth period forms spherical droplets, which then deviate from spherical shape and evolve into nanorods. The presence of a double bond in the surfactant molecules is responsible for the anisotropic growth. The low water content in the microemulsion inhibits the growth rate of the nanoparticles.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Physical
Malik Abdul Rub, Tajmul Hasan, Roksanur Akter, Dileep Kumar, Kabir-ud-Din, Abdullah M. Asiri, Anamul Hoque
Summary: The clouding development and association of surfactant and antidiabetic drug mixture were studied using different hydrotropes in aqueous solutions. The addition of hydrotropes reduced the cloud point of the surfactant and antidiabetic drug mixture. The critical micelle concentration and extent of ionization of the surfactant and antidiabetic drug mixture were found to be dependent on the hydrotrope contents and temperature changes.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Physical
Roksanur Akter, K. M. Anis-Ul-Haque, Md. Abdul Mottalib, Dileep Kumar, Md. Tuhinur R. Joy, Shahed Rana, Md. Anamul Hoque, Tahani Mazyad Almutairi, Abdallah A. A. Mohammed, Amjad Iqbal
Summary: This study investigates the supramolecular interaction between the surfactant TTAB and the antidiabetic drug MNH in the presence of additives. The critical micelle concentration (CMC) of the mixed system is assessed through conductometric analysis, and the thermodynamic nature of the micellisation process is evaluated by monitoring the effect of temperature change. The estimation of thermodynamic parameters and the determination of the degree of counter ion binding provide insights into the viability of the micellisation process. The study suggests that various supramolecular forces contribute to the aggregation of the TTAB+ MNH system.
Article
Chemistry, Physical
Md. Nazrul Islam, Malik Abdul Rub, Md. Rafikul Islam, Md. Abdul Goni, Shahed Rana, Dileep Kumar, Abdullah M. Asiri, Yousef G. Alghamdi, Md. Anamul Hoque, Shariff E. Kabir
Summary: This study investigated the potential interactions between the antibiotic ceftriaxone sodium (CTS) and the surfactant triton X-100 (TX-100) in the presence and absence of various sodium based electrolytes and hydrotropic salts. The results showed that the hydrophilic interaction was significant when sodium salicylate (NaSal) was used, but not significant when sodium benzoate (NaBenz) was used. Thermodynamic variables were calculated to evaluate the nature of the interactions, and the findings may have important implications for pharmaceutical formulations and understanding drug-surfactant interactions.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Physical
Zita Farkas Agatic, Kosta Popovic, Dileep Kumar, Dusan Skoric, Mihalj Posa
Summary: This study investigates the formation of binary mixed micelles of sodium cholate (SC) - hexadecyltrimethylammonium bromide (HDTAB) and sodium cholate (SC) - dodecyltrimethylammonium bromide (DTAB) in an aqueous NaCl solution. The interactions and conformations of the surfactants are analyzed using 2D ROESY spectrum. The results show synergistic interactions and the dependence of molar excess Gibbs free energy on the mole fraction of the surfactant.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Physical
Mezbah Hossain, Shamim Mahbub, Malik Abdul Rub, Shahed Rana, Md. Anamul Hoque, Dileep Kumar, Yousef G. Alghamdi, Mohammed Abdullah Khan
Summary: The interaction between crown ether (B18C6) and levofloxacin hemihydrate (LH) molecule has been studied using UV spectrometry, revealing the formation of a stable complex with strong interaction. This study aims to investigate the potential role of B18C6 in drug delivery due to its amphiphilic nature.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Physical
S. M. Rafiul Islam, Md. Rafikul Islam, Shamim Mahbub, Kamrul Hasan, Dileep Kumar, Javed Masood Khan, Anis Ahmad, Md. Anamul Hoque, D. M. Shafiqul Islam
Summary: The phase separation behavior of non-ionic surfactants-drug in aqueous hydrotropes has been studied. The cloud point is found to be dependent on the concentration of hydrotropes, and the positive standard Gibbs free energy values indicate the non-spontaneity of phase separation. The thermodynamic properties of transfer and enthalpy entropy compensation entities are calculated and explained.
Article
Multidisciplinary Sciences
Yousef G. Alghamdi, Malik Abdul Rub, Dileep Kumar
Summary: The influence of double-headed gemini was investigated on the reaction between the amino acid methionine and ninhydrin in CH3COOH-CH3COONa buffer solvent. The surfactant-like effect was observed and explained by a pseudo-phase model of micelles. The impact of temperature, pH, and concentration of ninhydrin and methionine on the reaction was also studied. The CMC of gemini surfactants and the surfactant system with methionine and ninhydrin was evaluated and other parameters such as rates and binding constants were calculated.
ROYAL SOCIETY OPEN SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Md. Rafiul Islam Rony, Javed Masood Khan, Md. Rafikul Islam, K. M. Khairul Alam, Dileep Kumar, Anis Ahmad, Shahed Rana, Md. Anamul Hoque
Summary: This study thoroughly investigated the phase partitioning of Triton X-100 and ceftriaxone sodium trihydrate drug mixture in aqueous solutions of sodium salts. The effect of different sodium salts on the cloudy creation of the mixture was explored, and it was found that the interaction between Triton X-100 and ceftriaxone sodium trihydrate is mainly electrostatic and hydrophobic.
Article
Chemistry, Physical
Dileep Kumar, Mihalj Posa
Summary: The anions of bile acids form linear hydrophobic congeneric groups (LCG) in the lnk - lnCMC plane and in the plane of enthalpy and entropy of bile salts micellization. The formation of LCG is not solely determined by hydrophobic effect and interaction, but also related to the energy and entropy changes of the hydrogen bonds. This finding provides insight into the thermodynamic behavior of bile acids.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Engineering, Environmental
Sk Mehebub Rahaman, Madhuparna Chakraborty, Sandip Kundu, Subhendu Dhibar, Dileep Kumar, Samia M. Ibrahim, Manab Chakravarty, Bidyut Saha
Summary: In this study, SmF3 nanoparticles with a hexagonal closed pack structure were synthesized using W/O microemulsions. The crystal structure, composition, purity, and morphology of the nanoparticles were assessed using various techniques. The particle size distribution of the SmF3 nanoparticles was found to be dependent on the water to surfactant mole ratio (W0), with higher W0 resulting in larger particle size distribution. The nanoparticles showed the ability to adsorb phosphate ions from aqueous solution, with smaller nanoparticles exhibiting higher adsorption effectiveness due to their larger surface area.
JOURNAL OF HAZARDOUS MATERIALS ADVANCES
(2023)
Article
Chemistry, Multidisciplinary
Mohosin Ali, Tajmul Hasan, Javed Masood Khan, Dileep Kumar, Anis Ahmad, Shahed Rana, Mohammad Majibur Rahman, Anamul Hoque, Shariff E. Kabir
Summary: The micellization behavior of a mixture of cetylpyridinium bromide (CPB) and levofloxacin hemihydrate (LFH) was investigated in aqueous and additive mixtures. The formation of micelles was observed through specific conductivity measurements, and the critical micelle concentration (CMC) and counter ion binding were evaluated. The thermodynamics of the system were also analyzed, with negative values for free energy indicating a spontaneous aggregation process. The study provides insights into the interaction forces and thermodynamic properties of the CPB + LFH mixture.
