Cotton University (formerly known as Cotton College) is a public state university located in Guwahati, Assam, India. It was established in 2017 by the provisions of an Act from the Assam Legislative Assembly which merged Cotton College State University and Cotton College. The University has progressed to become one of the top 200 institutions of the country (appearing on the list of 150–200 in the National Institutional Ranking Framework rank list in May 2020).Cotton College was established in 1901 by Sir Henry Stedman Cotton, Chief Commissioner of the former British province of Assam. It was the oldest institute of higher education in Assam and all of Northeast India. Cotton College became a constituent college of Gauhati University in 1948, and then of Cotton College State University when it was established in 2011, by an Act (Act XIX of 2011) of the Assam Government. The Cotton University Act, 2017, was enacted to resolve problems between the college and the university.
Herein, we have reported the synthesis and crystal structure of four multicomponent compounds viz. (fumH2)(4-CNPy)2 (1), (succH2)(4-CNPy)2 (2), (2-Cl-3-OHpy)(4,4-bpy)& sdot;0.5H2O (3) and (4-AmpyH)2(ADS)& sdot;3.75H2O (4), (where, fumH2 = fumaric acid, succH2 = succinic acid, 2-Cl-3-OHpy =2-chloro-3-hydroxypyridine, CNpy = cyanopyridine, bpy = bipyridine, Ampy = Aminopyridine and ADS = anthraquinone-1,5-disulfonate). Compound 1 and 2 are co-crystals whereas compound 3 and 4 are co-crystal hydrate and salt hydrate, respectively. The pKa-based approach has been utilized for the synthesis of co-crystals and the molecular salt reported here. Moreover, crystallographic evidences based on the C-N-C bond angle of the pyridine ring and C-O bond distances of dicarboxylic acid co-formers in the respective compounds have also been analyzed to support molecular salt or co-crystal formation. Crystal structure analysis of the co-crystals 1 & 2 showcase structure guiding R22(7) H-bonding synthon, antiparallel C--O & ctdot;C--O interaction and nitrile-nitrile interactions. Unconventional Type I Cl & ctdot;Cl contact along with hydrogen bonding and pi-stacking interaction strengthens the crystal structure of co-crystal hydrate 3. Moreover, in the salt hydrate 4, the lattice water molecules form interesting R44(12) and R24(8) hydrogen bonding synthons with ADS moiety. Furthermore, the non-covalent interactions stabilizing the supramolecular assemblies of co-crystals 1-3 have been investigated using density functional theory (DFT) calculations. The molecular electrostatic potential (MEP) surfaces have been computed to rationalize the formation of the co-crystals/hydrates. In addition, the energetic features of the synthon forming O-H & ctdot;N, C-H & ctdot;O, C-H & ctdot;N, antiparallel nitrile & ctdot;nitrile and type I Cl & ctdot;Cl interactions have been analyzed using a combination of QTAIM and NCIplot computational tools.
The sensing performance of a p–n junction photodetector can be enhanced by incorporating an organic layer forming a hybrid organic–inorganic device. A p-Bi2O3/n-SnO2 heterojunction-based visible-blind UV photodetector was synthesised using pulsed laser deposition. Thereafter, a PVA layer of different molar concentrations (0.3, 0.5 and 0.7 M) was deposited on the p-Bi2O3/n-SnO2 heterojunction to enhance and achieve selective UV sensing. The structural, surface morphological, optical and electrical properties of the PVA-coated devices were analysed. The p-Bi2O3/n-SnO2 heterojunction exhibited a peak responsivity of 43.99 ± 3.74 AW−1, quantum efficiency of (2.11 ± 0.18) × 104
Cuscuta is a genus of holoparasitic plants in the family Convolvulaceae and the tribe Ipomoeae, widely distributed across temperate and subtropical regions, comprising approximately 220 species worldwide, that are entirely dependent on host plants for survival, and several are known for their ecological, agricultural, and ethnomedicinal significance. The present study documents five new hosts of Cuscuta reflexa Roxb. from Garbhanga Reserve Forest of Assam, including four hosts newly recorded for India, thereby expanding the known host range of the species in the region. Anatomical observations confirming host-parasite attachment through haustorial penetration are presented, along with photographic documentation of host plants habit, parasite twining behavior, and floral morphology of C. reflexa to facilitate accurate identification. The study provides broader ecological insights into host-parasite associations of C. reflexa within forest ecosystems and emphasizes the importance of safeguarding ecologically and economically valuable host plants from parasitic infestation, while simultaneously recognizing the need to conserve native Cuscuta species as integral components of forest biodiversity, thereby supporting long-term ecosystem stability in Garbhanga Reserve Forest.
The effects of convective boundary conditions on the flow of a viscous fluid through a porous sheet that is expanding exponentially are studied in this study, along with additional factors such as heat absorption, viscous dissipation, thermophoresis, chemical reactions, and others. The numerical solutions to the governing equations are evaluated using the bvp4c technique in conjunction with similarity requirements. The effect of different parameters on different physical variables are depicted using graphs. The fluid > s velocity increases with the increase in thermophoretic parameter. The temperature profile decreases with the rise in Grashof number and Schmidt number. While the concentration profile escalates with the rise in Schmidt number. Many real-world situations involve the co-existence of thermophoresis, viscous dissipation, chemical processes, heat absorption etc.
A novel single crystal of the fluorenone-based ligand L-1 was successfully synthesized and characterized using FT-IR, H-1 and (CNMR)-C-13 , ESI-MS techniques, as well as Single-crystal X-ray diffraction (SC-XRD). The L-1 crystal structure belongs to the monoclinic system, with space group P2(1)/n. Spectroscopic observations revealed that L-1 exhibited strong fluorescence behavior in the longer wavelength region. The ligand exhibits excellent selectivity and sensitivity as both a colorimetric and fluorometric sensor for Cu-2(+) ions. The fluorescence quenching in the presence of copper ions was attributed to the CHEQ phenomenon, with an excellent detection limit (LOD) and binding constant value. Job's plot and mass spectrometry confirmed a 2:1 binding stoichiometry between L-1 and Cu-2(+) ions. Further, DFT calculations revealed that L-1 coordinates to Cu-2(+) via the nitrogen atom of the imine group and the oxygen atom of the hydroxyl group, a binding mode supported by FTIR analysis of the complex. Moreover, L-1 functions as a reversible sensor for Cu-2(+) ions, maintaining its selectivity even when other metal ions are present. Additionally, L-1 was applied for Cu-2(+) ions detection in real-life water samples and HeLa cells. In conclusion, our study reported the synthesis of a single crystal of fluorenone-based Schiff base and its application for Cu-2(+) ions sensing in aqueous solutions and living cells.
