Indian Association for the Cultivation of Science

About: Indian Association for the Cultivation of Science is a education organization based out in Kolkata, India. It is known for research contribution in the topics: Excited state & Catalysis. The organization has 3867 authors who have published 10457 publications receiving 220098 citations.

A Versatile Tripodal Amide Receptor for the Encapsulation of Anions or Hydrated Anions via Formation of Dimeric Capsules

Abstract: A bowl-shaped tripodal receptor with an appropriately positioned amide functionality on the benzene platform and electron-withdrawing p-nitrophenyl terminals (L1) has been designed, synthesized, and studied for the anion binding properties. The single-crystal X-ray crystallographic analysis on crystals of L1 with tetrabutylammonium salts of nitrate (1), acetate (2), fluoride (3), and chloride (4) obtained in moist dioxane medium showed encapsulation of two NO3−, [(AcO)2(H2O)4]2−, [F2(H2O)6]2−, and [Cl2(H2O)4]2− respectively as the anionic guests inside the staggered dimeric capsular assembly of L1. The p-nitro substitution in the aryl terminals assisted the formation of dimeric capsular assembly of L1 exclusively upon binding/encapsulating above different guests. Though L1 demonstrates capsule formation upon anion or hydrated anion complexation for all of the anions studied here, its positional isomer with the o-nitro-substituted tripodal triamide receptor L2 selectively formed the dimeric capsular assemb...

Recyclable Heterogeneous Supported Copper‐Catalyzed Coupling of Thiols with Aryl Halides: Base‐Controlled Differential Arylthiolation of Bromoiodobenzenes

Abstract: Alumina-supported copper sulfate efficiently catalyzes the S-arylation of aromatic, heteroaromatic and aliphatic thiols with aryl as well as heteroaryl halides under aerobic, ligand-free conditions. This protocol provides an easy access to a variety of thioethers as well as unsymmetrical bis-thioethers by base-controlled differential coupling of thiols with iodo- and bromo-substituents in an aromatic halide. The catalyst is inexpensive, non-air sensitive, environmentally friendly and recyclable.

Duality between the deconfined quantum-critical point and the bosonic topological transition

Abstract: The authors thank Chong Wang and Meng Cheng for helpful discussions. Y. Q. Q., Y,-Y.H., Z.-Y.L., and Z. Y. M. are supported by the Ministry of Science and Technology of China under Grant No. 2016YFA0300502, the National Science Foundation of China under Grants No. 91421304, No. 11421092, No. 11474356, No. 11574359, and No. 11674370, and the National Thousand-Young-Talents Program of China. Y. Q. Q. would like to thank Boston University for support under its Condensed Matter Theory Visitors Program. Y.-Y. H. acknowledges the Cultivation of Outstanding Innovative Talents Program 2016 of Renmin University of China. The work of A. S. is partly supported through the Partner Group program between the Indian Association for the Cultivation of Science (Kolkata) and the Max Planck Institute for the Physics of Complex Systems (Dresden). A. W. S. is supported by the NSF under Grant No. DMR-1410126 and would also like to thank the Institute of Physics, Chinese Academy of Sciences for visitor support. C. X. is supported by the David and Lucile Packard Foundation and NSF Grant No. DMR-1151208. We thank the following institutions for allocation of CPU time: the Center for Quantum Simulation Sciences in the Institute of Physics, Chinese Academy of Sciences, the Physical Laboratory of High Performance Computing in the Renmin University of China, the Tianhe-1A platform at the National Supercomputer Center in Tianjin, and the Tianhe-2 platform at the National Supercomputer Center in Guangzhou. (2016YFA0300502 - Ministry of Science and Technology of China; 91421304 - National Science Foundation of China; 11421092 - National Science Foundation of China; 11474356 - National Science Foundation of China; 11574359 - National Science Foundation of China; 11674370 - National Science Foundation of China; National Thousand-Young-Talents Program of China; Boston University; Indian Association for the Cultivation of Science (Kolkata); Max Planck Institute for the Physics of Complex Systems (Dresden); DMR-1410126 - NSF; DMR-1151208 - NSF; David and Lucile Packard Foundation)

Fluorescent Graphene Oxide via Polymer Grafting: An Efficient Nanocarrier for Both Hydrophilic and Hydrophobic Drugs

Abstract: Functionalized graphene-based drug delivery vehicles have conquered a significant position because functionalization improves its biocompatibility and stability in cell medium, leaving sufficient graphitic basal plane for drug loading through π–π stacking. In this study, poly(N-isopropylacrylamide) (PNIPAM) is covalently grafted from the surface of graphene oxide (GO) via a facile, eco-friendly and an easy procedure of free radical polymerization (FRP) using ammonium persulfate initiator. Various spectroscopic and microscopic studies confirm the successful grafting of PNIPAM from GO surface. PNIPAM-grafted GO (GPNM) exhibits enhanced thermal stability, improved dispersibility both in aqueous and cell medium, and better biocompatibility and cell viability compared to GO. Interestingly, GPNM displays an exciting fluorescence property in aqueous medium, which is a hike of intensity at 36 °C due to the lower critical solution temperature (LCST) of PNIPAM chains (32 °C). Moreover both hydrophilic (doxorubicin ...