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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.


Papers
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TL;DR: In this paper, a cyclopentadienyl-imido compound of molybdenum (and tungsten) was shown to be a 4-electron donor ligand.
Abstract: New cyclopentadienyl-imido compounds of molybdenum (and tungsten) have been prepared. They have an extensive chemistry in which the imido group behaves as a 4-electron donor spectator ligand. The structure of the bis-qcyclopentadienyl compound [ M o ( ~ C ~ H ~ R ) ~ ( N B U ~ ) ] shows the q-cyclopentadienyl rings are partially displaced from the metal by the px-donor electron pair on the imido nitrogen. In consequence a q-cyclopentadienyl ring can be readily displaced. The ansa-sandwich compounds [ M ( ~ C ~ H ~ C M ~ ~ ~ I C ~ H ~ ) X ~ I , where M = Mo or W and X2 = Cl2. H2, Me2, HPh, HMe have been prepared. These ansa bridged compounds are much more resistant to reductive elimination reactions than their nonansa analogues. New transition metal compounds of the fullerene c60 have been prepared. STUDIES IN 11-CYCLOPENTADIENYL-IMO-MOLYBDENUM CHEMISTRY Both the imido ligands NR and the q-cyclopentadienyl ligands q-CgR5 have an extensive chemistry. The mission of this research was to learn more about the properties of imido ligands in general and, more specifically, the chemistry of the combination,of both ligands in q-cyclopentadienyl-imido-molybdenum (and -tungsten) compounds. References to previous chemistry of q-cyclopentadienyl-imido transition metal compounds are available (1.2). The 17-electron compounds [Mo(q-CgHqR)(NR')X2], where, typically, R = H or alkyl, R = But, Pri, or Ph and X = C1, Br or I, (1,2) may be prepared by the reactions shown below:R R' X But H, Me, P2 c1 Pr' H c1 Ph Me C1 But Me Br The d1 compounds [Mo(q-CsH4R)(NR')C12] readily undergo a reductive substitution reaction giving the 18-electron d2 compounds [Mo(~-CSH~R)(NR')LCI], where L = CO, PR3, C2H4, MeC2Me, viz:-

18 citations

Journal ArticleDOI
TL;DR: In this paper, the synthesis of vanadium and molybdenum complexes derived from nitrogen-containing heterocyclic aromatic ligands is described, and the first η-pyrazine sandwich complex, [V(η 6 -Me 4 pyrazine) 2 ], has been prepared by metal vapour synthesis and crystallographically characterized.

18 citations

Journal ArticleDOI
TL;DR: The cation [Mo(η-C7H7)L3]+ readily undergoes displacement of the arene ligand allowing the following compounds to be prepared.
Abstract: The cation [Mo(η-C7H7)(η-C6H5R)]+ readily undergoes displacement of the arene ligand allowing the following compounds to be prepared: [Mo(η-C7H7)L3][PF6][L3=(MeCN)3, (MeCN)2(PPh3), (MeCN)(Ph2PCH2CH2PPh2), (PMe2Ph)3, (PMePh2)3, or (CO)(PMe2Ph)2]; [(η-C7H7)Mo(µ-X)3Mo(η-C7H7)]A (X = Cl, Br, OMe, or OEt; A = PF6, or BF4); and [(η-C7H7)Mo(µ-X)3Mo(η-C7H7)](X = Cl, Br, I, or OMe). The last neutral compounds are paramagnetic, and electronic, e.s.r., i.r., and photolectron spectral studies have been made. The new compounds K2[Mo(η-C7H7)(CN)3], [Mo(η5-C6H7)(η-C7H7)], [Mo(η-C7H7)(PPh3)(pd)](pd = pentane-2.4- dionate), and [Mo(η-C3H5)(η-C7H7)(PPh3)] are also described.

18 citations

Journal ArticleDOI
TL;DR: The chloroborane, C1B(C6F5)2, has been investigated as a useful synthon for the preparation of a series of amino(pentafluorophenyl)boranes as mentioned in this paper.

18 citations


Cited by
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Journal ArticleDOI
Sumio Iijima1, Toshinari Ichihashi1
17 Jun 1993-Nature
TL;DR: In this article, the authors reported the synthesis of abundant single-shell tubes with diameters of about one nanometre, whereas the multi-shell nanotubes are formed on the carbon cathode.
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.

8,018 citations

Journal ArticleDOI
TL;DR: The interest in nanoscale materials stems from the fact that new properties are acquired at this length scale and, equally important, that these properties are equally important.
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

6,852 citations

Journal ArticleDOI
01 Feb 2013-Science
TL;DR: 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.
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.

4,596 citations

Journal ArticleDOI
TL;DR: The features of nanoparticle therapeutics that distinguish them from previous anticancer therapies are highlighted, and how these features provide the potential for therapeutic effects that are not achievable with other modalities are described.
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.

3,975 citations

Journal ArticleDOI
TL;DR: Department of Materials Science, University of Patras, Greece, Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, and Dipartimento di Scienze Farmaceutiche, Universita di Trieste, Piazzale Europa 1, 34127 Triesteadays.
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

3,886 citations