1397937-06-2Relevant academic research and scientific papers
Organophosphonate bridged anatase mesocrystals: Low temperature crystallization, thermal growth and hydrogen photo-evolution
Brahmi, Younes,Katir, Nadia,Agullo, Juan Antonio MacIa,Primo, Ana,Bousmina, Mosto,Pierre Majoral, Jean,Garcia, Hermenegildo,El Kadib, Abdelkrim
, p. 15544 - 15556 (2015)
The sol-gel co-condensation of organo-phosphonates to titanium alkoxides enables access to novel organic-inorganic hybrids based on phosphonate-bridged titanium dioxide. In this contribution, we bring new perspectives to the long established sol-gel mineralization of titanium alkoxide species, by harnessing the virtues of the well-designed phosphonate-terminated phosphorus dendrimers as reactive amphiphilic nanoreactor, confined medium and cross-linked template to generate discrete crystalline anatase nanoparticles at low temperature (T = 60 °C). An accurate investigation on several parameters (dendrimer generation, dendrimer-to-titanium alkoxide ratio, precursor reactivity, temperature, solvent nature, salt effect) allows a correlation between the network condensation, the opening porous framework and the crystalline phase formation. The evolution of the dendrimer skeleton upon heat treatment has been deeply monitored by means of 31P NMR, XPS and Raman spectroscopy. Increasing the heteroatom content within a titania network provides the driving force for enhancing their photocatalytic water splitting ability for hydrogen production.
Dendritic phosphoramidite ligands for Rh-catalyzed [2+2+2] cycloaddition reactions: Unprecedented enhancement of enantiodiscrimination
Garcia, Lidia,Roglans, Anna,Laurent, Regis,Majoral, Jean-Pierre,Pla-Quintana, Anna,Caminade, Anne-Marie
supporting information; experimental part, p. 9248 - 9250 (2012/09/11)
Phosphorus dendrimers containing terminal phosphoramidite ligands have been found to be highly effective and recoverable catalysts for the rhodium(i) catalyzed [2+2+2] cycloaddition reactions. A strong positive dendritic effect is observed both in the activity and enantiodiscrimination leading to axially chiral biaryl compounds.
