2,6‐(Diphenylmethyl)‐4‐alkyl‐phenyl substituted phosphates, ArOP(O)(OH)2 (Ar=2,6‐CHPh2‐4‐R‐C6H2; R=Me (9), Et (10), iPr (11), and tBu (12)), were synthesized from the corresponding phenols. The single crystals of these compounds were obtained from their solutions of CH3CN or CH3COCH3. The molecular structures of these compounds, in the solid state, determined by single crystal X‐ray analysis reveal that they possess a hitherto unknown structural motif among monoorganophosphate esters viz., a dimeric hydrogen bonded structure involving a P−OH donor and a P=O acceptor group affording an eight‐membered ring. This structural motif is similar to what is commonly found in the solid state structures of carboxylic acids. In all of these compounds the solid state structure is restricted to the dimeric motif except in 9 where a 1D hydrogen‐bonded polymer formation is observed when it crystallized from acetonitrile. Deprotonation of these monoorganophosphates with triethylamine afforded the anionic phosphates, [ArOP(O)(OH)(O)]− containing Et3NH+ as the counter cation (Ar=2,6‐CHPh2‐4‐R‐C6H2; R=Me (13), Et (14), iPr (15), and tBu (16)). The solid state molecular structures of 13–16 again reveal hydrogen‐bonded dimeric structures in the solid state. In order to demonstrate the proof‐of‐principle with regard to the reactivity of the monoorganophosphates, we explored the reaction of 9 with ZnCl2 in the presence of pyrazole (PzH) and Et3N affording a dinuclear Zn(II) complex, [Et3NH]2[{ArOP(O)3}2{Zn(Cl)(PzH)}2] (Ar=2,6‐CHPh2‐4‐Me–C6H2) (17). The two Zn(II) centers are linked to each other by two dianionic [ArOP(O)3]2− ligands. Two additional triethylammonium cations and a terminal Zn−Cl moiety compensate the charge and complete the composition of 17.
In the era of fifth-generation networks and the Internet of Things new class of lightweight, ultrathin, and multifunctional electromagnetic interference (EMI) shielding materials have become inevitable prerequisites for the protection...
A new family of mononuclear LnIII complexes were synthesized by utilizing a tridentate Schiff base ligand. SIM behaviour is seen in the DyIII analogue (diluted) with Ueff = 68(2) K under a 1000 Oe applied dc field.
Polymer nanocomposites with exceptionally high mechanical properties owing to strong interfacial attraction have garnered tremendous interest in the research community. In general, tough and robust polymer nanocomposites are usually obtained via dispersing a nano‐flaky filler in the polymer matrix, although the strategy is only sometimes practically viable. To this end, in this work, a facile strategy has been adopted to achieve a strong and tough polymer nanocomposite. A novel mussel‐inspired full interpenetrating polymeric network (IPN) consisting of polyvinylalcohol and polydopamine was prepared. This technique helped integrate the advantages of dopamine chemistry with forming a full IPN using Borax as a common crosslinker. The infusion of 1 wt% acid‐modified carbon nanotubes (ACNT) in the IPN matrix helped greatly improve the current state‐of‐the‐art. The synergistic effect of nano‐reinforcement and formation of ester linkage through a substantial amount of di‐diol complexation dominated and accounted for the significant enhancement of mechanical properties. This is further supported by decreased intensity of free OH groups in the FTIR investigations, viscosity enhancement from rheological behavior, and temperature‐dependent dynamic mechanical property analysis. Such an IPN structure is a promising way to enhance mechanical properties.
This book presents the abstracts of the papers presented to the Online National Conference on Research and Developments in Material Processing, Modelling and Characterization 2020 (RDMPMC-2020) held on 26th and 27th August 2020 organized by the Department of Metallurgical and Materials Science in Association with the Department of Production and Industrial Engineering, National Institute of Technology Jamshedpur, Jharkhand, India.
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