The uranium bipyridyl metallocene, [η5-1,2,4-(Me3C)3C5H2]2U(bipy) (2), prepared from [η5-1,2,4-(Me3C)3C5H2]2UCl2 (1) and 2,2′-bipyridine in the presence of potassium graphite (KC8) has been evaluated small-molecule activation. In contact with AgF, Ph2E2 (E = S, Se), (PhNH)2, (PhCH═N)2, diazenes, pyridine N-oxide, organic azides, diazoalkanes, Ph2CS, Ph2CO, it behaves as a synthon for [η5-1,2,4-...

We analyze a new family of carbon nanotube-based molecular wires, formed by encapsulating metallocene molecules inside the nanotubes. Our simulations, which are based on a combination of nonequilibrium Green function techniques and density functional theory, indicate that these wires can be engineered to exhibit desirable magnetotransport effects for use in spintronics devices. The proposed str...

Functionalized polyethylene-based nanocomposites were prepared by in situ polymerization of ethylene with modified or neat MCM-41 nanoparticles (NMCM-41). Two different synthetic approaches investigated to improve the compatibility between hydrophobic HDPE matrix and hydrophilic NMCM-41: (i) incorporation UA into polymeric copolymerization ethylene, promoted zirconocene catalyst under homogeneo...

Recently, we have identified the Al-alkenyl species iBuAl(oct-7-en-1-yl)2 (Al-1) as a promising long-chain branching (LCB) promoter in ethylene polymerization catalyzed by rac-{EBTHI}ZrCl2-based systems, proposing incorporation of its alkenyl moiety into growing polyethylene (PE) chain crucial step for LCB formation. The success process was attributed to high copolymerization ability selected c...

This account critically surveys the field of side-chain transition metal-containing polymers as prepared by controlled living ring-opening metathesis polymerization (ROMP) of the respective metal-incorporating monomers. Ferrocene- and other metallocene-modified polymers, macromolecules including metal-carbonyl complexes, polymers tethering early or late transition metal complexes, etc. are here...

Two different hybrid cavitand-resorcin[4]arenes are shown to be effective and selective receptors for the molecular inclusion of positively charged organometallic sandwich complexes of appropriate size. The binding constants of the 1 : 1 complexes formed with a series of neutral and positively charged metallocenes have been calculated using different titration techniques. The motion of the incl...

in this research na-y was synthesized by hydrothermal method and used as support for preparation of sn/pt/na-y catalysts using two different tin precursors, bu3sn(cl) and sncl2.2h2o, by sequential impregnation, in which the pt  was deposited first and in the next step sn was deposited. the catalysts were characterized by h2 chemisorption, transmission electron microscopy (tem), scanning electro...