Search results for: David R. Tyler

Items from 1 to 20 out of 70 results

article

An empirically derived model for further increasing microwave curing rates of epoxy‐amine polymerizations

Robert L. Hubbard, David R. Tyler, Brady Thompson

Journal of Applied Polymer Science > 138 > 1 > n/a - n/a

The reaction rates of common epoxy resins with diamine crosslinking agents in uniform microwave fields have been compared according to a variety of structural features. A statistically designed experimental matrix was used to determine that the curing rates were linearly dependent on only two significant variables, amine basicity, and degrees of rotational freedom (entropy) of the reactants. Surprisingly,...

article

Fluxional Behavior of cis-Fe(DMeOPrPE)₂(H)₂ (DMeOPrPE = 1,2-[bis(dimethoxypropyl)phosphino]ethane); Implications for the Pressure Swing Purification of Natural Gas

Susan R. Cooper, Bryan P. Nell, David R. Tyler

Journal of Inorganic and Organometallic Polymers and Materials > 2017 > 27 > 1 > 57-62

Materials such as trans-Fe(DMeOPrPE)₂(X)(H₂O)⁺ (DMeOPrPE = 1,2-[bis(dimethoxypropyl)phosphino]ethane; X = Cl or H) show considerable promise as sorbents for the removal of N₂ from natural gas in a pressure swing process. One problem, however, is that in long-term tests these sorbents slowly degrade over a period of many weeks. This study probed the degradation mechanism for the purpose of finding...

article

Low temperature cure of epoxy thermosets attaining high T_g using a uniform microwave field

Robert L. Hubbard, S. Michael Strain, Connor Willemsen, David R. Tyler

Journal of Applied Polymer Science > 133 > 47 > n/a - n/a

It is demonstrated for the first time that an epoxy thermoset resin can be cured at temperatures well below its T_g_∞. This study compared the use of a uniform variable frequency microwave (VFM) field to standard oven curing at temperatures above and below T_g_∞. Using T_g, tan δ, modulus, and FTIR measurements, it is shown that the reaction of BFDGE with MDA to attain a product with T_g_∞ of 133 °C is achieved...

article

Synthesis of Iron-Phosphine Complexes Containing Sulfur Linking Groups for Coordination to PbS Nanoparticles

Alexander J. Kendall, Lev N. Zakharov, David R. Tyler

Journal of Inorganic and Organometallic Polymers and Materials > 2016 > 26 > 6 > 1313-1319

The synthesis of a bidentate phosphine, 1,2-bis(bis(4-methylthio)phenyl)phosphino)ethane (DpPSMePE), for coordination to both iron (through the phosphines) and subsequent outer-sphere coordination to PdS nanoparticles (through distal –SMe moieties) is presented. Coordination to iron yielded two distinct coordination complexes: trans-FeCl₂(DpPSMePE)₂ and (μ-DpPSMePE-κP:κP′)₂(FeCl₂)₂. The trans-FeCl...

article

Highly efficient biphasic ozonolysis of alkenes using a high-throughput film-shear flow reactor

Alexander J. Kendall, Justin T. Barry, Daniel T. Seidenkranz, Ajay Ryerson, more

Tetrahedron Letters > 2016 > 57 > 12 > 1342-1345

A new method for ozonolysis of alkenes using a continuous flow film-shear reactor was developed. The reactor uses a shearing microfluidic mixing chamber to provide biphasic mixing of an organic phase and aqueous phase with ozone gas. The H₂O acts as an in situ reducing agent for the carbonyl oxide intermediate, providing ketones and aldehydes directly from the reaction mixture. Flow rates of up to...

article

Desulfurization of Model Fuels with Carbon Nanotube/TiO₂ Nanomaterial Adsorbents: Comparison of Batch and Film-Shear Reactor Processes

Mohammad N. Siddiqui, Tawfik A. Saleh, Munzir H. Aneel Mohammed, Chanbasha Basheer, more

Journal of Inorganic and Organometallic Polymers and Materials > 2016 > 26 > 3 > 572-578

The effectiveness of carbon nanotube/TiO₂ (CNT/TiO₂) adsorbents to desulfurize model fuels containing various thiophenes was studied. The CNT/TiO₂ adsorbents were characterized by scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDX), and Fourier transform infrared spectroscopy (FTIR). Experiments carried out in the film-shear reactor and in a batch reactor were both very...

article

Enhanced oxidative desulfurization in a film-shear reactor

Brandy R. Fox, Benjamin L. Brinich, Jonathan L. Male, Robert L. Hubbard, more

Fuel > 2015 > 156 > Complete > 142-147

A film-shear reactor was used to significantly enhance the oxidative desulfurization (ODS) of model fuels using hydrogen peroxide as the oxidant. Significant increases in the amount of sulfur removed were seen in comparison to conventionally stirred ODS reactions. For example, up to 50% desulfurization occurred in a single pass of the model fuel through the film-shear reactor at 10°C. The desulfurization...

article

Mechanisms for the Formation of NH₃, N₂H₄, and N₂H₂ in the Protonation Reaction of Fe(DMeOPrPE)₂N₂ {DMeOPrPE = 1,2‐bis[bis(methoxypropyl)phosphino]ethane}

David R. Tyler

Zeitschrift für anorganische und allgemeine Chemie > 641 > 1 > 31 - 39

Research from the author's laboratory is reviewed on the reaction of Fe(DMeOPrPE)₂N₂ with acid to form ammonia and hydrazine {DMeOPrPE is the water‐soluble, bidentate phosphine 1,2‐bis[bis(methoxypropyl)phosphino]ethane}. DFT calculations suggested that a symmetric protonation mechanism was more favorable than either an asymmetric protonation mechanism or a dinuclear mechanism. Two symmetric protonation...

article

New Iron–Phosphine Macrocycle Complexes for Use in the Pressure-Swing Purification of Natural Gas

Bryan P. Nell, Charles D. Swor, Lev N. Zakharov, David R. Tyler

Journal of Inorganic and Organometallic Polymers and Materials > 2015 > 25 > 3 > 495-506

Two new synthetic routes to macrocyclic tetradentate phosphine complexes of Fe(II) were investigated. The interest in these materials stems from their potential application in the pressure-swing purification of natural gas contaminated by N ₂ . Both synthetic routes used Fe(II) as a templating metal in order to avoid using Ni, Pd, or Pt, which can be difficult to remove from the...

article

Nitrile and Cyanohydrin Hydration with Nanoparticles Formed In Situ from a Platinum Dihydride Complex

Emma L. Downs, David R. Tyler

Journal of Inorganic and Organometallic Polymers and Materials > 2015 > 25 > 1 > 73-80

The trans-PtH₂(P(OMe)₃)₂ complex was synthesized and tested as a nitrile hydration catalyst. Under nitrile hydration reaction conditions, the complex degrades to Pt nanoparticles, which are catalytically active for nitrile hydration. TEM analysis shows that the Pt nanoparticles are approximately 2 nm in diameter. ³¹P NMR and XPS studies of the nanoparticles show that the stabilizing ligand on the...

article

Metal–metal bond photochemistry as a tool for understanding the photochemical degradation of plastics

David R. Tyler

Inorganica Chimica Acta > 2015 > 424 > C > 29-37

Research from the author’s laboratory is reviewed on the photochemistry of polymers that have metal–metal bonds incorporated into their backbones. These polymers are useful for studying the mechanistic aspects of polymer photodegradation because irradiation with visible light causes photolysis of the metal–metal bonds with subsequent degradation of the polymer backbone. The relative simplicity of...

article

Nanoparticle catalysts for nitrile hydration

Emma L. Downs, David R. Tyler

Coordination Chemistry Reviews > 2014 > 280 > Complete > 28-37

The transition metal-catalyzed hydration of nitriles is an efficient route to amides, which are important synthetic building blocks. Many heterogeneous and homogeneous catalysts have been explored for this reaction, but there are drawbacks to each type of catalyst. Nanoparticle (NP) catalysis is a potential bridge between heterogeneous and homogeneous catalysis, frequently combining the easy separation...

article

Synthesis, reactivity, and coordination chemistry of secondary phosphines

Bryan P. Nell, David R. Tyler

Coordination Chemistry Reviews > 2014 > 279 > Complete > 23-42

The coordination chemistry of secondary phosphines is reviewed. Although the number of secondary phosphine complexes is still relatively small, a number of important uses for these complexes have emerged. In particular, they are useful precursors in the synthesis of asymmetric tertiary phosphines, and they are important synthetic intermediates in the preparation of phosphine macrocycles. The use of...

article

Platinum Phosphinito Catalysts for Nitrile Hydration

Spring Melody M. Knapp, Tobias J. Sherbow, Takiya J. Ahmed, Indre Thiel, more

Journal of Inorganic and Organometallic Polymers and Materials > 2014 > 24 > 1 > 145-156

The reaction of PEt₂OH with K₂PtCl₄ yields [PtCl{(PEt₂O)₂H}]₂ (2). The X-ray crystal structure of 2 shows that the two chloride ligands bridge the two Pt atoms. The structure is unusual in that the PtCl₂Pt unit is bent, which is the first example of a platinum phosphinito chloride-bridged dimer that is bent. Dimer 2 is a poor catalyst for the hydration of acetonitrile (and presumably other nitriles)...

article

Structure and reactivity of iron(II) complexes of a polymerizable bis-phosphine ligand

Joel W. Gohdes, Lev N. Zakharov, David R. Tyler

Polyhedron > 2013 > 52 > Complete > 1169-1176

Iron(II) complexes of 1,2-bis(diallylphosphino)ethane (TAPE) were explored as a possible route to polymeric materials that would reversibly bind N ₂ and H ₂ . A new synthetic route to the TAPE ligand was developed. Starting with the trans-Fe(TAPE) ₂ Cl ₂ complex, a series of iron(II) complexes was synthesized having the general formula FeL ₂ (A)(B) where L=TAPE...

article

A Strategy for Preparing Star Polymers Containing Metal–Metal Bonds Along the Polymeric Arms Using Click Chemistry

Sarah E. Brady, David R. Tyler

Journal of Inorganic and Organometallic Polymers and Materials > 2013 > 23 > 1 > 158-166

The [(η⁵-C₅H₄(CH₂)₃N₃)Mo(CO)₃]₂ dimer (3) was prepared and used to determine if the Huisgen cycloaddition reaction could be used to synthesize high molecular weight star polymers with metal–metal bonds in the arms. Several different click catalysts were examined. Cp*Ru(PPh₃)₂Cl (Cp* = η⁵-C₅(CH₃)₅) was previously shown to catalyze the formation of metal–metal bond-containing polymers using click chemistry;...

article

Synthesis of the hydrophilic phosphine complex Cu(DHMPE)2+ from Cu(I) chloride (DHMPE=1,2-bis[(dihydroxymethyl)phosphino]ethane, a water-soluble bidentate phosphine)

Bryan P. Nell, Charles D. Swor, Lev N. Zakharov, David R. Tyler

Polyhedron > 2012 > 45 > 1 > 30-34

The biomedically useful Cu(DHMPE) ₂ ⁺ complex (DHMPE=1,2-bis[(dihydroxymethyl)phosphino]ethane, a water-soluble bidentate phosphine) is normally synthesized from expensive Cu(I) sources because the use of cheaper CuCl can lead to a variety of unwanted coordination complex by-products. A method is reported for the synthesis of Cu(DHMPE) ₂ ⁺ from CuCl. Reaction of CuCl with DHMPE...

article

Ring-opening polymerization of (CH₃)₂Si[CpMo(CO)₃]₂, a molecule with an –Si(CH₃)₂– bridge between two cyclopentadienyl ligands

Dawn M. Jennings, Sarah E. Brady, Ginger V. Shultz, Lev N. Zakharov, more

Polymer Bulletin > 2012 > 68 > 9 > 2243-2254

The (CH₃)₂Si[CpMo(CO)₃]₂ complex (1) was synthesized and used to explore ring-opening polymerization (ROP) as a method to prepare high molecular weight polymers containing Mo–Mo bonds along their backbones. Attempts to initiate ROP of 1 using n-BuLi or PtCl₂ did not yield any polymers. The X-ray crystal structure of 1 shows that the Si center is not strained, and it is suggested that no ROP occurred...

article

Synthesis and coordination chemistry of macrocyclic phosphine ligands

Charles D. Swor, David R. Tyler

Coordination Chemistry Reviews > 2011 > 255 > 23-24 > 2860-2881

Macrocyclic phosphine compounds are sought after as ligands for transition metal complexes because of their strong binding properties. As such, these ligands are particularly useful in applications where robust transition metal–phosphine complexes are employed, as in homogeneous catalysis or in radiopharmaceuticals. This review summarizes the development of macrocyclic phosphine ligands, including...

article

Applications of the Tachiya Fluorescence Quenching Model To Describe the Kinetics of Solid-State Polymer Photodegradation

Jennifer M. Zemke, Bevin C. Daglen, M. Tachiya, David R. Tyler

Macromolecules > 2011 > 44 > 16 > 6625 - 6628

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Keywords

METAL–METAL BOND (6)
CAGE EFFECT (5)
PHOTOCHEMICALLY DEGRADABLE POLYMER (5)
PHOTOCHEMISTRY (5)
FILM-SHEAR REACTOR (4)
NITRILE HYDRATION (3)
CARBONYL COMPLEXES (2)
CLICK CHEMISTRY (2)
DESULFURIZATION (2)
DINITROGEN COMPLEXES (2)
HOMOGENEOUS CATALYSIS (2)
HUISGEN CYCLOADDITION REACTION (2)
MANUFACTURING (2)
METAL RADICAL (2)
METAL-METAL BOND (2)
METAL–METAL BONDS (2)
NANOPARTICLES (2)
ORGANOMETALLIC RADICALS (2)
PHOTODEGRADABLE POLYMER (2)
PRESSURE-SWING ABSORPTION (2)
RING-OPENING POLYMERIZATION (2)
SULFUR HETEROCYCLES (2)
THERMOSETS (2)
OXIDATIVE-ADDITION OF CCL 4 (1)
195PT NMR SPECTROSCOPY (1)
4-METHYLBENZENESULFONATE (1)
ACETONE CYANOHYDRIN (1)
ACRYLIC MONOMERS (1)
ADMET (1)
AMIDE POLYMERS (1)
AMIDES (1)
AMMONIA (1)
AMMONIA PRODUCTION (1)
ANSA-MOLYBDOCENE (1)
ANSA-MOLYBDOCENES (1)
AQUEOUS COORDINATION CHEMISTRY (1)
AQUEOUS ORGANOMETALLIC CHEMISTRY (1)
AQUEOUS SPECIATION (1)
BASE TITRATION (1)
BATCH DESULFURIZATION PROCESS (1)
BIOMEDICALLY USEFUL METAL COMPLEX (1)
BIPHASIC KINETICS (1)
BIPHASIC REACTION (1)
CARBON NANOTUBE/TIO2 COMPOSITE (1)
CARBONYL OXIDE (1)
CATALYSIS (1)
CATALYTIC HYDRATION (1)
CATALYTIC HYDROLYSIS (1)
CATALYTIC NITRILE HYDRATION (1)
CHIRAL PHOSPHINES (1)
CLICK CHEMISTRY CATALYSTS (1)
CLICK COUPLING (1)
CNT/TIO2 NANOMATERIALS (1)
COOH GROUPS (1)
COPPER PHOSPHINE COMPLEX (1)
CROSSLINKING (1)
CROSSLINKING, IRRADIATION (1)
CRYSTAL STRUCTURE (1)
CRYSTAL STRUCTURES (1)
CYANIDE CATALYST POISONING (1)
CYANOHYDRIN HYDRATION (1)
CYANOHYDRINS (1)
CYCLOPENTADIENYL COMPLEXES (1)
DIHYDROGEN COMPLEX (1)
DINITROGEN COMPLEX (1)
DINUCLEAR COMPLEXES (1)
ELECTROCHEMISTRY (1)
ELECTRON RESERVOIRS (1)
ELECTRON TRANSFER (1)
FLOW CHEMISTRY (1)
FLUXIONAL MOLECULES (1)
GLASS TRANSITION (1)
HYDRAZINE (1)
HYDROGEN BONDING (1)
HYDROGEN BONDING INDEX (HBI) (1)
HYDROGENASE (1)
INTRAMOLECULAR HYDROGENATION (1)
IRON COORDINATION CHEMISTRY (1)
IRON MACROCYCLE COMPLEXES (1)
IRON(II) (1)
IRON-CARBONYL COMPLEXES (1)
IRON-PHOSPHINE COMPLEXES (1)
IRON‐DINITROGEN COMPLEXES (1)
ISOMERIZATION (1)
KINETIC MODELING (1)
LIGAND SYNTHESIS (1)
MACROCYCLIC LIGANDS (1)
MACROCYCLIC PHOSPHINE LIGANDS (1)
MER-CIS- TO FAC-ISOMERIZATION (1)
METAL RADICALS (1)
METAL-METAL BONDS (1)
METAL–METAL BOND-CONTAINING POLYMERS (1)
METAL–POLYMER COMPLEXES (1)
METATHESIS (1)
MICROVISCOSITY (1)
MOLYBDENUM COMPLEX (1)
MOLYBDENUM COMPLEXES (1)
MOLYBDOCENE (1)
MOLYBDOCENE COMPLEXES (1)
MONOMER–DIMER EQUILIBRIA (1)
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ACS (26)
Elsevier (24)
Springer (17)
Wiley (3)

Journal

Journal of Inorganic and Organometallic Polymers and Materials (14)
Coordination Chemistry Reviews (9)
Inorganic Chemistry (7)
Inorganica Chimica Acta (6)
Organometallics (6)
Journal of the American Chemical Society (5)
Macromolecules (5)
Journal of Organometallic Chemistry (3)
Fuel (2)
Journal of Applied Polymer Science (2)
Journal of Chemical Crystallography (2)
Polyhedron (2)
The Journal of Organic Chemistry (2)
Journal of Photochemistry & Photobiology, A: Chemistry (1)
Polymer Bulletin (1)
Tetrahedron Letters (1)
The Journal of Physical Chemistry A (1)
Zeitschrift für anorganische und allgemeine Chemie (1)
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INFONA - science communication portal

Search results for: David R. Tyler

An empirically derived model for further increasing microwave curing rates of epoxy‐amine polymerizations

Fluxional Behavior of cis-Fe(DMeOPrPE)₂(H)₂ (DMeOPrPE = 1,2-[bis(dimethoxypropyl)phosphino]ethane); Implications for the Pressure Swing Purification of Natural Gas

Low temperature cure of epoxy thermosets attaining high T_g using a uniform microwave field

Synthesis of Iron-Phosphine Complexes Containing Sulfur Linking Groups for Coordination to PbS Nanoparticles

Highly efficient biphasic ozonolysis of alkenes using a high-throughput film-shear flow reactor

Desulfurization of Model Fuels with Carbon Nanotube/TiO₂ Nanomaterial Adsorbents: Comparison of Batch and Film-Shear Reactor Processes

Enhanced oxidative desulfurization in a film-shear reactor

Mechanisms for the Formation of NH₃, N₂H₄, and N₂H₂ in the Protonation Reaction of Fe(DMeOPrPE)₂N₂ {DMeOPrPE = 1,2‐bis[bis(methoxypropyl)phosphino]ethane}

New Iron–Phosphine Macrocycle Complexes for Use in the Pressure-Swing Purification of Natural Gas

Nitrile and Cyanohydrin Hydration with Nanoparticles Formed In Situ from a Platinum Dihydride Complex

Metal–metal bond photochemistry as a tool for understanding the photochemical degradation of plastics

Nanoparticle catalysts for nitrile hydration

Synthesis, reactivity, and coordination chemistry of secondary phosphines

Platinum Phosphinito Catalysts for Nitrile Hydration

Structure and reactivity of iron(II) complexes of a polymerizable bis-phosphine ligand

A Strategy for Preparing Star Polymers Containing Metal–Metal Bonds Along the Polymeric Arms Using Click Chemistry

Synthesis of the hydrophilic phosphine complex Cu(DHMPE)2+ from Cu(I) chloride (DHMPE=1,2-bis[(dihydroxymethyl)phosphino]ethane, a water-soluble bidentate phosphine)

Ring-opening polymerization of (CH₃)₂Si[CpMo(CO)₃]₂, a molecule with an –Si(CH₃)₂– bridge between two cyclopentadienyl ligands

Synthesis and coordination chemistry of macrocyclic phosphine ligands

Applications of the Tachiya Fluorescence Quenching Model To Describe the Kinetics of Solid-State Polymer Photodegradation

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