Malcolm L. H. Green

Bio: Malcolm L. H. Green is an academic researcher from University of Oxford. The author has contributed to research in topics: Carbon nanotube & Cyclopentadienyl complex. The author has an hindex of 82, co-authored 800 publications receiving 31121 citations. Previous affiliations of Malcolm L. H. Green include Gas Technology Institute & University of Illinois at Urbana–Champaign.

Hexakis(trimethylphosphine)molybdenum chemistry: dinitrogen, ethylene, butadiene, η-cyclopentadienyl, and related derivatives

Abstract: Co-condensation of molybdenum atoms with trimethylphosphine gives octahedral [ Mo(PMe3)6](1) whose crystal structure has been determined. Treatment of (1) with dinitrogen, ethylene, carbon monoxide, iodine, or butadiene gives [Mo(N2)(PMe3)5], trans-[Mo(η-C2H4)2(PMe3)4]fac-[Mo(CO)3(PMe3)3], trans-[MoI2(PMe3)4], and cis-[Mo(η-C4H6)2(PMe3)2] respectively. Protonation of cis-[Mo(η-C4H6)2(PMe3)2] with tetrafluoroboric acid forms the compound cis-[[graphic omitted]CH2CHCHCH2)(η-C4H6)(PMe3)2]BF4. The presence of the Mo–H–C bond is shown by low-temperature n.m.r. spectra, and variable-temperature n.m.r. shows that the agostic hydrogen can scramble between the four terminal carbons of the two C4 ligands. The rate constants and activation parameters for the hydrogen-scrambling process have been determined and a mechanism is proposed. Reaction of cis-[Mo(η-C4H6)2(PMe3)2] with trifluoroacetic acid gives [Mo(η-MeC3H4)(η-C4H6)(PMe3)2(O2CCF3)]. Treatment of [Mo(PMe3)6] with cyclopentadiene forms [MoH(η-C5H5)(PMe3)3] which reacts with aqueous tetrafluoroboric acid giving [MoH2(η-C5H5)(PMe3)3]BF4 and [Mo(η-C5H5)(PMe3)2O]BF4. Reaction of [MoH(η-C5H5)(PMe3)3] with methyl iodide gives [MoH(η-C5H5)(PMe3)2I2].

Light-induced instability of PbO-filled single-wall carbon nanotubes

Abstract: We investigated single-wall carbon nanotubes filled with lead oxide, PbO, by transmission electron microscopy and Raman spectroscopy. It is concluded that PbO crystallizes in the orthorombic phase forming nanowires inside the nanotubes. The positions of the PbO Raman lines are downshifted as compared to the bulk material as a result of the reduced dimensionality. As a consequence of the filling, nanotubes become sensitive to the laser irradiation. At higher laser power densities, they oxidize and the free PbO nanowires are left in the sample.

Some 1 and 3-allylic and metallocyclobutane derivatives of molybdenum and tungsten

Abstract: Nucleophilic attack by R–= H– or Me– on [W(η5-C5H5)2(η3-CH2CHCH2)]+PF6– occurs on the central carbon of the η3-allylic group giving the metallocyclobutane compounds [W(η5-C5H5)2(CH2CHRCH2)] which, for RH, undergo deuteriation giving [W(η5-C5H5)2H(CH2CHCH2D)]+PF6–; similar attack occurs on the analogous molybdenum compounds.

Single-shell carbon nanotubes of 1-nm diameter

Abstract: CARBON nanotubes1 are expected to have a wide variety of interesting properties. Capillarity in open tubes has already been demonstrated2–5, while predictions regarding their electronic structure6–8 and mechanical strength9 remain to be tested. To examine the properties of these structures, one needs tubes with well defined morphologies, length, thickness and a number of concentric shells; but the normal carbon-arc synthesis10,11 yields a range of tube types. In particular, most calculations have been concerned with single-shell tubes, whereas the carbon-arc synthesis produces almost entirely multi-shell tubes. Here we report the synthesis of abundant single-shell tubes with diameters of about one nanometre. Whereas the multi-shell nanotubes are formed on the carbon cathode, these single-shell tubes grow in the gas phase. Electron diffraction from a single tube allows us to confirm the helical arrangement of carbon hexagons deduced previously for multi-shell tubes1.

Chemistry and properties of nanocrystals of different shapes.

Abstract: The interest in nanoscale materials stems from the fact that new properties are acquired at this length scale and, equally important, that these properties * To whom correspondence should be addressed. Phone, 404-8940292; fax, 404-894-0294; e-mail, mostafa.el-sayed@ chemistry.gatech.edu. † Case Western Reserve UniversitysMillis 2258. ‡ Phone, 216-368-5918; fax, 216-368-3006; e-mail, burda@case.edu. § Georgia Institute of Technology. 1025 Chem. Rev. 2005, 105, 1025−1102

Carbon Nanotubes: Present and Future Commercial Applications

Abstract: Worldwide commercial interest in carbon nanotubes (CNTs) is reflected in a production capacity that presently exceeds several thousand tons per year. Currently, bulk CNT powders are incorporated in diverse commercial products ranging from rechargeable batteries, automotive parts, and sporting goods to boat hulls and water filters. Advances in CNT synthesis, purification, and chemical modification are enabling integration of CNTs in thin-film electronics and large-area coatings. Although not yet providing compelling mechanical strength or electrical or thermal conductivities for many applications, CNT yarns and sheets already have promising performance for applications including supercapacitors, actuators, and lightweight electromagnetic shields.

Nanoparticle therapeutics: an emerging treatment modality for cancer

Abstract: Nanoparticles — particles in the size range 1–100 nm — are emerging as a class of therapeutics for cancer. Early clinical results suggest that nanoparticle therapeutics can show enhanced efficacy, while simultaneously reducing side effects, owing to properties such as more targeted localization in tumours and active cellular uptake. Here, we highlight the features of nanoparticle therapeutics that distinguish them from previous anticancer therapies, and describe how these features provide the potential for therapeutic effects that are not achievable with other modalities. While large numbers of preclinical studies have been published, the emphasis here is placed on preclinical and clinical studies that are likely to affect clinical investigations and their implications for advancing the treatment of patients with cancer.

Chemistry of Carbon Nanotubes

Abstract: Department of Materials Science, University of Patras, 26504 Rio Patras, Greece, Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vass. Constantinou Avenue, 116 35 Athens, Greece, Institut de Biologie Moleculaire et Cellulaire, UPR9021 CNRS, Immunologie et Chimie Therapeutiques, 67084 Strasbourg, France, and Dipartimento di Scienze Farmaceutiche, Universita di Trieste, Piazzale Europa 1, 34127 Trieste, Italy