00987nas a2200253   4500008004100000022001400041245014100055210006900196260007700265300001600342490000700358653003200365653001900397653002500416653001800441653001600459100002400475700002900499700002100528700001800549700001800567700002000585856012800605       2013                        eng d  a1433-785100aEnhancement of chemical stability and crystallinity in porphyrin-containing covalent organic frameworks by intramolecular hydrogen bonds0 aEnhancement of chemical stability and crystallinity in porphyrin  aBOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANYbWILEY-V C H VERLAG GMBHcDEC  a13052-130560 v5210acovalent organic frameworks10ahydrogen bonds10amesoporous materials10aporphyrinoids10atautomerism1 aKandambeth, Sharath1 aShinde, Digambar, Balaji1 aPanda, Manas, K.1 aLukose, Binit1 aHeine, Thomas1 aBanerjee, Rahul  uhttps://library.ncl.res.in/content/enhancement-chemical-stability-and-crystallinity-porphyrin-containing-covalent-organic-002052nas a2200205   4500008004100000022001400041245007900055210006900134260011000203300001400313490000600327520126500333100002101598700002101619700002401640700002401664700002201688700002001710856011601730       2014                        eng d  a2050-748800aMultifunctional and robust covalent organic framework-nanoparticle hybrids0 aMultifunctional and robust covalent organic frameworknanoparticl  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcMAR  a7944-79520 v23 a<p>Highly dispersed Pd(0) nanoparticles were successfully immobilized into a stable, crystalline and porous covalent organic framework (COF), TpPa-1, by a solution infiltration method using NABH(4) as a reducing agent. High resolution and dark field TEM images confirmed the uniform loading of the Pd(0) nanoparticles into the TpPa-1 matrix without aggregation. This hybrid material exhibited excellent catalytic activity towards the Cu free Sonogashira, Heck and sequential one pot Heck-Sonogashira cross-coupling reactions under basic conditions, and with superior performance compared to commercially available Pd supported on activated charcoal (i.e., 1, 5 and 10 wt%). Additionally, the precursor Pd(II)-doped COF also displayed competitive catalytic activity for the intramolecular oxidative biaryl synthesis under acidic conditions. Both catalysts were found to be highly stable under the reaction conditions showing negligible metal leaching, non-sintering behavior, and good recyclability. To the best of our knowledge, the organic support used in this work, TpPa-1, constitutes the first COF matrix that can hold both Pd(0) nanoparticles and Pd(II) complex without aggregation for catalytic purposes under both highly acidic and basic conditions.</p>1 aPachfule, Pradip1 aPanda, Manas, K.1 aKandambeth, Sharath1 aShivaprasad, S., M.1 aDiaz, David, Diaz1 aBanerjee, Rahul  uhttps://library.ncl.res.in/content/multifunctional-and-robust-covalent-organic-framework-nanoparticle-hybrids-0