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: Catalysis & Excited state. The organization has 3867 authors who have published 10457 publications receiving 220098 citations.

Metallogels from Coordination Complexes, Organometallic, and Coordination Polymers.

Abstract: A supramolecular gel results from the immobilization of solvent molecules on a 3D network of gelator molecules stabilized by various supramolecular interactions that include hydrogen bonding, π-π stacking, van der Waals interactions, and halogen bonding. In a metallogel, a metal is a part of the gel network as a coordinated metal ion (in a discrete coordination complex), as a cross-linking metal node with a multitopic ligand (in coordination polymer), and as metal nanoparticles adhered to the gel network. Although the field is relatively new, research into metallogels has experienced a considerable upsurge owing to its fundamental importance in supramolecular chemistry and various potential applications. This focus review aims to provide an insight into the development of designing metallogelators. Because of the limited scope, discussions are confined to examples pertaining to metallogelators derived from discrete coordination complexes, organometallic gelators, and coordination polymers. This review is expected to enlighten readers on the current development of designing metallogelators of the abovementioned class of molecules.

Honeycomb nets with interpenetrating frameworks involving iminodiacetato-copper(II) blocks and bipyridine spacers: syntheses, characterization, and magnetic studies.

Abstract: Three coordination polymers of copper(II), viz. {[Cu(ida)(4,4‘-bipyH)]ClO4}∝ (1), {[Cu2(ida)2(μ-4,4‘-bipy)]·2H2O}∝ (2), and [Cu2(ida)2(bpa)]∝ (3) have been synthesized by the process of self-assembly using Cu(ida) [ida = iminodiacetate(2-)] as the building block and 4,4‘-bipyridyl and 1,2-bis(4-pyridyl)ethane (bpa) as linkers. Crystals of 1 are orthorhombic, of space group Pna21, with a = 13.8956(12) A, b = 16.3362(16) A, c = 7.3340(12), and Z = 4. Both compounds 2 and 3 crystallize in monoclinic space group P21/a with a = 10.1887(8) A (9.6779(10) A for 3), b = 8.0008(11) A (9.1718(10) A), c = 11.6684(9) A (12.9144(12) A), β = 98.307(11)° (102.796(18)°), and Z = 2 (2). Compound 1 has a zigzag chain structure with an extensive hydrogen-bonded network while compounds 2 and 3 are honeycomb (6,3) nets with interpenetrating structures. Variable temperature (2−300 K) magnetic study indicates the presence of weak antiferromagnetic interactions (J = 0.82 ± 0.01 cm-1) in 1 and ferromagnetic in 2 (J = −0.45 ± 0.05 ...

Design and Synthesis of Nanostructured Porous SnO2 with High Surface Areas and Their Optical and Dielectric Properties

Abstract: A new structure-directing agent, hexadecyl-2-pyridinyl-methylamine, L16, was prepared through Schiff base condensation between pyridine-2-carboxaldehyde and hexadecylamine followed by reduction of the imine with NaBH4. Mesoporous and supermicroporous tin oxide particles with crystalline pore walls were obtained through a low-temperature sol–gel synthesis process by using an anionic surfactant, sodium dodecylsulfate, and hexadecyl-2-pyridinyl-methylamine, respectively, as templates. Powder X-ray diffraction, transmission electron microscopy-energy-dispersive spectrometry, field emission scanning electron microscopy, CHN chemical analysis, N2 sorption, 1 H and 13 C NMR, high-resolution mass spectrometry, Fourier transform infrared spectroscopy, and UV–vis absorption spectroscopic tools were employed to characterize L16 and nanostructured SnO2 materials. X-ray diffraction and transmission electron microscopy image analyses suggested that these porous materials have a wormhole-like disordered arrangement of pores, whereas the pore walls are crystalline. Nitrogen physisorption studies show high specific surface areas up to 555 m 2 g -1 , and the uniform nanoscale pore size distribution ranged from supermicropore to mesopores for these materials. These SnO2 materials showed drastic reduction of dielectrics with the induction of porosity vis-a-vis bulk SnO2. These unique optical and electrical properties of porous SnO2 materials over bulk SnO2 could be attributed to the quantum confinement effect.

Covalent Organic Framework Material Bearing Phloroglucinol Building Units as a Potent Anticancer Agent

Abstract: Covalent organic frameworks (COFs) having periodicity in pores of nanoscale dimensions can be suitably designed for the organic building units bearing reactive functional groups at their surfaces. Thus, they are an attractive option as an anticancer agent to overcome the limitations of chemotherapy. Herein, we first report a new porous biodegradable nitrogen containing COF material, EDTFP-1 (ethylenedianiline-triformyl phloroglucinol), synthesized using 4,4′-ethylenedianiline and 2,4,6-triformylphloroglucinol via Schiff base condensation reaction. EDTFP-1 exhibited 3D-hexagonal porous structure with average pores of ca. 1.5 nm dimension. Here, we have explored the anticancer potentiality of EDTFP-1. Result demonstrated an enhanced cytotoxicity was observed against four cancer cells HCT 116, HepG2, A549, and MIA-Paca2 with significant lower IC50 on HCT116 cells. Additionally, EDTFP-1-induced cell death was associated with the characteristic apoptotic changes like cell membrane blebbing, nuclear DNA fragmen...