Papers by christopher landorf
Jüngste Entwicklungen in der Metallabenzolchemie
Angewandte Chemie, Jun 12, 2006
... Additional Information. How to Cite. Landorf, CW and Haley, MM (2006), Jüngste Entwicklungen ... more ... Additional Information. How to Cite. Landorf, CW and Haley, MM (2006), Jüngste Entwicklungen in der Metallabenzolchemie. Angewandte Chemie, 118: 40184040. doi: 10.1002/ange. 200504358. ... Email: Michael M. Haley Prof. Dr. ([email protected]). Publication History. ...
Recent Advances in Metallabenzene Chemistry
ChemInform, Sep 12, 2006
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was e... more ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Organometallics, Feb 19, 2004
(8) with two nucleophilic (Z)-3-(2-lithiovinyl)cyclopropenes provides a rational synthesis of pla... more (8) with two nucleophilic (Z)-3-(2-lithiovinyl)cyclopropenes provides a rational synthesis of platinabenzenes 6 and 7. The intermediate σ-vinyl complexes 9 and 10 are also isolated from the reaction mixtures and convert cleanly to the corresponding platinabenzenes in near-quantitative yield. For the last several years we have been exploring a general procedure for the synthesis of metallabenzenes 1 and their valence isomers starting from (Z)-3-(2-iodoethenyl)cyclopropenes such as 1. 2-4 Treatment of 1 with
Functionalized Carbon Nanotubes Enabled Flexible and Scalable Co2 Sensors
The synthesis of iridabenzenes and platinabenzenes from nucleophilic 3-vinylcyclopropenes
Design of Polar Organic Liquid Crystalline Thin Films
Organic Thin Films, 2002
... Christopher Landorf, Jeremy Wolf, Chenguang Li, Wei Xie, Jeff Jacobsen, Jim Simpson, and Dani... more ... Christopher Landorf, Jeremy Wolf, Chenguang Li, Wei Xie, Jeff Jacobsen, Jim Simpson, and Daniel J. Dyer* Department of Chemistry, Southern Illinois ... The most successful of these is thepoled polymer approach whereby a large dipole dopant is dispersed into an amorphous ...
Aqueous Phase Organometallic Catalysis Using (MeCp)2Mo(OH)(H2O)+. Intramolecular Attack of Hydroxide on Organic Substrates
Organometallics, 2004
ABSTRACT The hydrolysis of esters and difunctional ethers catalyzed by Cp'Mo-2(OH)(H2O)(+... more ABSTRACT The hydrolysis of esters and difunctional ethers catalyzed by Cp'Mo-2(OH)(H2O)(+) (1) (Cp' = eta(5)-C5H4CH3) and the stoichiometric oxidation of CO to CO2 in the presence of 1 are described. These reactions, combined with the previously reported nitrile hydrations and phosphate esters hydrolyses catalyzed by 1, demonstrate that 1 is an effective homogeneous catalyst for hydration, hydrolysis, and oxidation reactions in aqueous solution under mild conditions (pH similar to7, similar to80 degreesC). Each reaction is proposed to proceed by intramolecular attack of the hydroxide ligand on a bound substrate. The intramolecular nature of the reaction is supported by the ester hydrolysis activation parameters (DeltaH(double dagger) = 5.9 +/- 0.7 kcal/mol and DeltaS(double dagger) = -48 +/- 9 eu), the lack of H/D exchange, and the significant increase (10(6)-10(8)) in the rate of hydrolysis over uncatalyzed hydrolysis.
Organometallics, 2009
Lithium-halogen exchange of (Z)-1,2-diphenyl-3-(2-iodoethenyl)cyclopropene (1) and subsequent add... more Lithium-halogen exchange of (Z)-1,2-diphenyl-3-(2-iodoethenyl)cyclopropene (1) and subsequent addition to (η 4-1,5-cod)PtCl 2 yields the platinabenzene (η 5-C 5 H 3 Ph 2)[PtC 5 H 3 Ph 2 ] (7), in which the metallacyclic ring and C 5 H 3 Ph 2 (Cp 0) unit are both derived from the cyclopropene skeleton. Starting instead with (η 5-C 5 Me 5)Pt(CO)I, treatment with three nucleophilic (Z)-3-(2lithiovinyl)cyclopropenes provides platinabenzenes (η 5-C 5 Me 5)[PtC 5 H 3 PhR] (R=Ph (8), t-Bu (9), Me (10)) in low to modest yield. All platinabenzenes have been fully characterized by NMR spectroscopy and X-ray crystallography. Intermediate σ-vinyl complexes (η 5-C 5 Me 5)Pt(σ-C 5 H 3 PhR) (R=Ph (14), t-Bu (15)) are also isolated from the reaction mixtures and convert cleanly to the corresponding platinabenzenes in near quantitative yield. Reactivity studies of (η 5-C 5 Me 5)-[PtC 5 H 3 Ph 2 ] with a variety of reagents/conditions are also reported.
Organometallics, 2004
(8) with two nucleophilic (Z)-3-(2-lithiovinyl)cyclopropenes provides a rational synthesis of pla... more (8) with two nucleophilic (Z)-3-(2-lithiovinyl)cyclopropenes provides a rational synthesis of platinabenzenes 6 and 7. The intermediate σ-vinyl complexes 9 and 10 are also isolated from the reaction mixtures and convert cleanly to the corresponding platinabenzenes in near-quantitative yield. For the last several years we have been exploring a general procedure for the synthesis of metallabenzenes 1 and their valence isomers starting from (Z)-3-(2-iodoethenyl)cyclopropenes such as 1. 2-4 Treatment of 1 with
Jüngste Entwicklungen in der Metallabenzolchemie
Angewandte Chemie, 2006
... Additional Information. How to Cite. Landorf, CW and Haley, MM (2006), Jüngste Entwicklungen ... more ... Additional Information. How to Cite. Landorf, CW and Haley, MM (2006), Jüngste Entwicklungen in der Metallabenzolchemie. Angewandte Chemie, 118: 40184040. doi: 10.1002/ange. 200504358. ... Email: Michael M. Haley Prof. Dr. ([email protected]). Publication History. ...
Recent Advances in Metallabenzene Chemistry
Angewandte Chemie International Edition, 2006
Research into aromatic metallacycles, though discussed in the literature over the last quarter ce... more Research into aromatic metallacycles, though discussed in the literature over the last quarter century, has undergone a major expansion since 2000. A wide variety of new metallabenzenes, encompassing new synthetic methods and new metal centers, is now available. New aromatic metallacycle topologies (iridanaphthalene, osmabenzynes) have been isolated and characterized. The first metallabenzene valence isomers (iridabenzvalenes, rhodabenzvalenes) and constitutional isomers (isoosmabenzenes) are now known. This review discusses the synthesis, chemistry, and physical properties of these intriguing aromatic compounds.
Aqueous Phase Organometallic Catalysis Using (MeCp)<sub>2</sub>Mo(OH)(H<sub>2</sub>O)<sup>+</sup>. Intramolecular Attack of Hydroxide on Organic Substrates
Organometallics, Mar 19, 2004
ABSTRACT The hydrolysis of esters and difunctional ethers catalyzed by Cp&#39;Mo-2(OH)(H2O)(+... more ABSTRACT The hydrolysis of esters and difunctional ethers catalyzed by Cp&#39;Mo-2(OH)(H2O)(+) (1) (Cp&#39; = eta(5)-C5H4CH3) and the stoichiometric oxidation of CO to CO2 in the presence of 1 are described. These reactions, combined with the previously reported nitrile hydrations and phosphate esters hydrolyses catalyzed by 1, demonstrate that 1 is an effective homogeneous catalyst for hydration, hydrolysis, and oxidation reactions in aqueous solution under mild conditions (pH similar to7, similar to80 degreesC). Each reaction is proposed to proceed by intramolecular attack of the hydroxide ligand on a bound substrate. The intramolecular nature of the reaction is supported by the ester hydrolysis activation parameters (DeltaH(double dagger) = 5.9 +/- 0.7 kcal/mol and DeltaS(double dagger) = -48 +/- 9 eu), the lack of H/D exchange, and the significant increase (10(6)-10(8)) in the rate of hydrolysis over uncatalyzed hydrolysis.
Environmental Life Cycle Assessment on CNTRENE® 1030 Material and CNT Based Sensors Environmental Laboratory Environmental Life Cycle Assessment on CNTRENE ® 1030 Material and CNT Based Sensors Final report
Stable, surfactant-free semiconducting carbon nanotube (CNT) inks were developed. The inks were f... more Stable, surfactant-free semiconducting carbon nanotube (CNT) inks were developed. The inks were functionalized with π-bonder receptor molecules to achieve selectivity toward DNT and TNT molecules. Two types of CNT sensors, interdigitated electrode (IDE) and thin-film transistor (TFT) sensors were printed and were tested with DNT vapor and other analytes. The CNT IDE sensors were able to repeatedly detect DNT vapor levels as low as 0.5 ppb with a response time of less than 10 seconds. These sensors showed a high degree of selectivity toward DNT over nitrobenzene and nicotine. Sensor sensitivity was found to increase with an increase in receptor molecules present in the CNTs. Preliminary results on a CNT TFT sensor showed a response to 300 ppb of DNT, a response similar to that of an IDE sensor prepared with CNTs with the same level of functionalization. Preparation and testing of sensors (especially TFT sensors) made with more functionalized CNT inks are ongoing.
This report details a study investigating the environmental impacts associated with the developme... more This report details a study investigating the environmental impacts associated with the development and manufacturing of carbon nanotube (CNT)–based ink (called CNTRENE 1030 material) and novel CNT temperature, flex, and moisture sensors. Undertaken by a private-public partnership involving Brewer Science (Rolla, Missouri), Jordan Valley Innovation Center of Missouri State University (Springfield, Missouri), and the US Army Engineer Research and Development Center (Vicksburg, Mississippi), this work demonstrates the environmental life cycle assessment (ELCA) methodology as a diagnostic tool to pinpoint the particular processes and materials posing the greatest environmental impact associated with the manufacture of the CNTRENE material and CNT-based sensor devices. Additionally, ELCA tracked the degree to which optimizing the device manufacturing process for full production also changed its predicted marginal environmental impacts.
Concentrated Solutions of Highly Conductive Pyrene-Functionalized Carbon Nanotubes Suitable for Printing
MRS Proceedings, 2013
ABSTRACTAs produced, raw carbon nanotubes are not soluble in many solvents necessary for printing... more ABSTRACTAs produced, raw carbon nanotubes are not soluble in many solvents necessary for printing applications. Standard methods for circumventing this problem involve sidewall functionalization and surfactants. Sidewall functionalization invariably destroys the π-network that gives carbon nanotubes their useful electronic properties, while surfactants deposit an insulating layer onto the carbon nanotube surface that must be washed off to regain the desired properties. Non-covalent functionalization offers the possibility to achieve solubility without destroying the π-network, but published methods have resulted in relatively low concentrations or substandard electronic performance. We have developed a scalable method to non-covalently functionalize long…
Highly Soluble Carbon Nanotubes with Enhanced Conductivity
This novel method for preparing a carbon nanotube film having improved characteristics is provide... more This novel method for preparing a carbon nanotube film having improved characteristics is provided. The method broadly provides the step of reacting a compound containing a carbon nanotube (CNT), and multi-aromatic moiety in the presence of a strong acid. During the reaction step, the multi-aromatic moiety is bonded to the carbon nanotubes and non-covalently. Additionally, the functional moiety is to further functionalized by a strong acid. This double-functionalised allows dispersed without impairing the desirable electrical and physical properties thereof in a concentration which CNT exceeds a solution in 0.5 g / L. To the resulting solution is stable during several months storage no observable clumping phenomenon, and printing the conductive traces (conductive trace) by the ink-jet, screen, flexographic (flexographic), various means, including gravure printing, or rotation, and spray coating to be included in the solution.
Synthesis and characterisation of laterally substituted noncentrosymmetric main chain hydrogen-bonded polymers
Liquid Crystals, 2014
A series of laterally substituted noncentrosymmetric hydrogen-bonded liquid crystalline polymers ... more A series of laterally substituted noncentrosymmetric hydrogen-bonded liquid crystalline polymers which incorporate stilbazole acceptor units, alkyl or ethylene glycol linkers units, and benzoic acid or phenol donor units were prepared and investigated for their hydrogen bonding behaviour and phase transitions. Fourier transform infrared (FTIR) indicated that these polymers possess strong intermolecular donor–acceptor hydrogen bonding. These polymers have lower melting points than their non-substituted analogue, and some of the polymers are mesomorphic.
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Papers by christopher landorf