Group 4 complexes bearing alkoxide functionalized <i>N</i>
-heterocyclic carbene ligands as catalysts in the polymerization of olefins
作者:Chiara Costabile、Carmen Bocchino、Mariagrazia Napoli、Pasquale Longo
DOI:10.1002/pola.26183
日期:2012.9.15
Novel octahedral zirconium complexesbearingalkoxidefunctionalizedN‐heterocyclic carbeneligands have been synthesized and characterized. NMR analysis showed that more than one species was obtained during synthesis. The synthesized complexes were able to polymerize ethylene and propylene giving rise to a linear polyethylene with high Mw and polydispersity index often bimodal with molecular weight
Silver(I) N-heterocyclic carbene complexes: Synthesis, characterization and antibacterial activity
作者:Mariagrazia Napoli、Carmela Saturnino、Elena Immacolata Cianciulli、Mario Varcamonti、Anna Zanfardino、Giuseppina Tommonaro、Pasquale Longo
DOI:10.1016/j.jorganchem.2012.10.040
日期:2013.2
Five new silver complexes having bidentate N-heterocyclic carbene ligands were synthesized and characterized by elemental analysis, IR, NMR and mass spectroscopic methods. Four of the ligands used are neutral, having an alcohol group on alkyl substituent of one of the two nitrogen atoms of the heterocycle [NHC-OH], the fifth, having a ligand alkoxide, is mono-anionic [NHC-O]. A study on the rate of hydrolysis of complexes synthesized, showed that they are stable to hydrolysis even after 24 h. Probably, the pincer effect of both [NHC-OH] and [NHC-O] ligands stabilizes these compounds. All the synthesized complexes do not show cytotoxicity, but they have a significant antibacterial activity. They were tested on Escherichia coli and Bacillus subtilis and data obtained demonstrate that the synthesized Ag-complexes are very promising candidates to be used as antimicrobial compounds. (C) 2012 Elsevier B.V. All rights reserved.