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.

Mono-η-cyclopentadienylniobium chemistry: ternary phosphine, carbonyl, 3,4-dimethylhexa-2,4-diene, halogeno-, and hydrido-derivatives

Abstract: The new compounds [Nb(η-C5H5)(dmpe)(CO)2], [Nb(η-C5H5)(dmpe)(CO)X2], X = Cl, Br, or I, [Nb(η-C5H5)(dmpe)2], [Nb(η-C5H5)(dmpe)(CO)2H][PF6], [{Nb(η-C5H5)(dmpe)H (µ-H)}2], [Nb(η-C5H5)(dmpe)H(µ-H2BH2)], and [Nb(η-C5H5)(dmpe) Cl][PF6][dmpe = 1,2-bis(dimethylphosphino)ethane] are described. Sodium amalgam reduction of [Nb(η-C5H5)(dmpe)(CO)Cl2] in the presence of but-2-yne followed by addition of hydrogen chloride gives [Nb(η-C5H5)(C4H2Me4)] and a further reduction gives [{Nb(η-C5H5)(η-C4H2Me4)(µ-Cl)}2]. The compound [Ta(η-C5H5)(dmpe)(CO)2] is also described.

Synthesis of mono-η-benzenebis(trimethylphosphine)-manganese and -rhenium compounds using the metal atoms

Abstract: Co-condensation of manganese or rhenium atoms with a mixture of benzene and trimethylphosphine forms the compounds Mn(η-C6H6)(PMe3)2H and [Re(η-C6H6)(PMe3)2]2 respectively; the latter gives rise to the derivatives Re(η-C6H6)(PMe3)2R (R = I or H).

(η-Benzene)bis(trimethylphosphine)iron: a useful precursor to polyene iron derivatives. Crystal structure of 2–4-η : 2′–4′-η-1,1′-bi(cyclohex-3-en-2-yl)-bis(trimethylphosphine)iron(II)

Abstract: (η-Benzene)bis(trimethylphosphine)iron reacts with 6,6-dimethylfulvene, 6-phenylfulvene, 6,6-di-phenylfulvene, cyclobutene, indene, 1,2-bis(dimethylphosphino)ethane, and 1,2-bis(diphenylphosphino) ethane giving [Fe(η5,η5′-C5H4CMe2CMe2C5H4)], [Fe{η5,η5′-C5H4CH(Ph)CH(Ph)C5H4}], [Fe(σ,η5-C5H4CPh2)(PMe3)2], [Fe(η-C4H6)(PMe3)3], [Fe(η5-C9H7)(PMe3)2H], and [Fe(η-C6H6)(R2PCH2CH2PR2)](R = Me or Ph) respectively. Treatment of [Fe(η-C6H6)(PMe3)2] with buta-1,3-diene gives a mixture of [Fe(η-C6H6)(η-C4H6)] and [Fe(η-C4H6)2(PMe3)]; with cycloheptatriene a mixture of [Fe(η4-C7H8)(PMe3)3], [Fe(η-C6H6)(η4-C7H8)], and [Fe(η5-C7H7)(η5-C7H9)] is obtained. [Fe(η-C6H6)(PMe3)2] reacts with cyclohexa-1,3-diene causing an unusual coupling giving the compound [Fe(η3,η3′-C12H16)(PMe3)2] which has been characterized by 1H–1H COSY, heteronuclear 1H–13C shift correlation two-dimensional n.m.r. experiments and crystal structure determination. Protonation of [Fe(η3,η3′-C12H16)(PMe3)2] gives the cation [[graphic omitted](PMe3)3]+ which contains an agostic hydrogen.

Further evidence for 1,2-hydrogen shift equilibria in the bis(η-cyclopentadienyl)methyltungsten system

Abstract: Trimethylphosphine reacts with [W(η-C5H5)2(η-C2H4)Me]PF6(1) to give [W(η-C5H5)2(CH2CH2PMe3)Me]PF6(8) which decomposes thermally to [W(η-C5H5)2(CH2PMe3)H]PF6(9). Thermal equilibrium between (9) and [W(η-C5H5)2(PMe3)Me]PF6(11) has been demonstrated. Methyldiphenylphosphine with [W(η-C5H5)2(η-C2H4)Me]PF6(1) gives the complex [W(η-C5H5)2(CH2PMePh2)H]PF6(10), then [W(η-C5H5)2(PMePh2)Me]PF6(12). The products of the reaction of a 1:1 mixture of [W(η-C5H5)2(η-C2H4)Me]PF6(1) and the CD3 analogue with PMe2Ph show that intermolecular hydrogen/deuterium scrambling does not occur. Exchange of the PMe2Ph group by PMe3 has been shown in [W(η-C5H5)2(CH2PMePh2)H]PF6(10). A mechanism for the reactions involving reversible 1,2-hydrogen shift equilibria of the tungsten–methyl system is discussed.

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