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.

Divalent diene and triene compounds of zirconium and hafnium; X-ray crystal structures of [Hf(η4-CH2CMe–CMeCH2)(PMe3)2Cl2], [Zr(η5-C5H5)2(PMe3)(η2-C7H8)], and {[Hf(η7-C7H7)(η5-C9H7)]2(µ-Me2PCH2CH2PMe2)}

Abstract: The synthesis and reactions of divalent compounds [Hf(η4-CH2CMe–CMeCH2)(PMe3)2Cl2] and [M(η6-C7H8)(PMe3)2Cl2](M = Zr, Hf) are described.

High yield synthesis of propanal from methane and air

Abstract: High yield synthesis of propanal from methane and air can be obtained in a single pass at atmospheric pressure. Three catalytic processes are combined to give 13% yield of propanal based on total methane input. Ethene is made from the oxidative coupling reaction and carbon monoxide and hydrogen is generated from partial oxygenation of methane. These gases are combined and passed to a hydroformylation catalyst to give liquid propanal. The unreacted methane is inert in the hydroformylation stage, while oxygen deactivates the catalyst readily. The results imply that propanal can be obtained, in good yield, from methane and air provided that total oxygen conversion is achieved. The yield of propanal from the three combined processes can be substantially higher than that of ethene from the oxidative coupling reaction. Thus, higher yields of a condensible and oxygenated product are obtained.

Trimethylphosphine–tungsten chemistry: hydrido, silyl, fluoro, hydroxy, and aquo derivatives: crystal structure of [W(PMe3)4H2(OH2)F]F

Abstract: The compounds W(PMe3)4H2X2(X = H, F, SiH3), [W(PMe3)4H2(OH)2]2+[BF4–]2, and [W(PMe3)4H2(OH2)F]F, whose crystal structure has been determined, are described; W(PMe3)4(η2-CH2PMe2)H reacts with ethylene giving inter alia W(η-C4H6)2(PMe3)2.

Alkyne addition and coupling reactions of [W2(η-C5H4R)2X4](X = Cl or Br)

Abstract: The WW triply bonded dimers [W2(η-C5H4Pri)2X4](X = Cl or Br) react with alkynes C2R2 to afford the dimetallatetrahedrane complexes [W2(η-C5H4Pri)2X4(µ-C2R2)](X = Cl, R = Et or SiMe3; X = Br, R = Me, Et or Ph†) or poorly defined polynuclear complexes [{W(η-C5H4Pri)Br2(CR)}3x](R = Me or Et) depending upon the reaction conditions. Treatment of [W2(η-C5H4R)2X4](X = Cl, R = Pri or Me; X = Br, R = Pri) with an excess of but-2-yne affords the corresponding flyover bridge complexes [W2(η-C5H4R)2X4(µ-C4Me4)]; treatment of [W2(η-C5H4Pri)2Cl4] with pent-2-yne gives a mixture of the isomers [W2(η-C5H4Pri)2Cl4{µ-(2,3)-C4Et2Me2}] and [W2(η-C5H4Pri)2Cl4{µ-(1,4)-C4Et2Me2}]. The planar bridging C4Me4 moiety in the crystallographically characterised trans-[W2(η-C5H4Me)2Cl4(µ-C4Me4)] is found to be perpendicular to the W–W bond and bound to each metal atom in a tetrahapto fashion. Treatment of [W2(η-C5H4Pri)2Cl4(µ-C2Et2)] or [{W(η-C5H4Pri)Br2(CEt)}3x] with an excess of but-2-yne affords the mixed-alkyne flyover bridge complexes [W2(η-C5H4Pri)2X4{µ-(1,2)-C4Et2Me2}](X = Cl or Br). The complexes [W2(η-C5H4R)2Cl4(µ-C4Me4)](R = Me or Pri) are readily hydrolysed in wet acetone to form the corresponding monooxo complexes [W2(η-C5H4R)2Cl2O(µ-C4Me4)]†. Complexes labelled † have been crystallographically characterised.

New synthetic pathways in η-cycloheptatrienyl molybdenum chemistry

Abstract: The synthesis of [Mo(η-C7H7)(η-C7H9)] from MoCl5 provides a convenient route to η-cycloheptatrienylmolybdenum compounds such as [Mo(η-C7H7)LX2] and [Mo(η-C7H7)L2X], where L = tertiary phosphines or acetonitrile and X = halogen, and [Mo(η-C7H7)(η-C5H4R)], R = H, Me.

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