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Creator | Title | Description | Subject | Date |
| 226 |
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Armentrout, Peter B. | Reactions of Ta+, W+, and Pt+ with H2, D2, and HD: effect of lanthanide contraction and spin-orbit interactions on reactivity and thermochemistry | There have been extensive experimental studies of the reactions of atomic first-row and second-row transition metal cations with dihydrogen and its isotopic analogues in our group. For third-row transition metal cations, however, only La+ and Lu+ systems have been studied experimentally although t... | Lanthanide contraction; Spin-Orbit interactions; Reactivity | 2002 |
| 227 |
 |
Armentrout, Peter B. | Statistical modeling of sequential collision-induced dissociation thresholds | Thermochemistry determined from careful analysis of the energy dependence of cross sections for collision-induced dissociation (CID) reactions has primarily come from the primary dissociation channel. Higher order dissociations generally have thresholds measured to be higher than the thermodynamic ... | Collision-induced dissociation; Endothermic reactions | 2007 |
| 228 |
 |
Morse, Michael David | Dispersed fluorsecence spectroscopy of jet-cooled AgAu and Pt? | Dispersed fluorescence spectroscopy has been used to study jet-cooled AgAu and Pt2 . Fluorescence resulting from the excitation of five bands of the A?X 1?+ system of AgAu was dispersed, and 51 measured ground state vibrational levels were fit to provide ground state vibrational constants of ?"e=198... | | 2001 |
| 229 |
 |
Armentrout, Peter B. | Activation of methane by gold cations: guided ion beam and theoretical studies | The potential energy surface for activation of methane by the third-row transition metal cation, Au+, is studied experimentally by examining the kinetic energy dependence of this reaction using guided ion beam tandem mass spectrometry. A flow tube ion source produces Au+ primarily in its 1S0 (5d10) ... | | 2006 |
| 230 |
 |
Voth, Gregory Alan; Ayton, Gary S. | Role of protein interactions in defining HIV-1 viral capsid shape and stability: a coarse-grained analysis | Coarse-grained models of the HIV-1 CA dimer are constructed based on all-atom molecular dynamics simulations. Coarse-grained representations of the capsid shell, which is composed of approximately 1,500 copies of CA proteins, are constructed and their stability is examined. A key interaction between... | Virus capsid; HIV-1; Viral capsid shape; Coarse-graining; CA dimer | 2010-01 |
| 231 |
 |
Armentrout, Peter B. | Cobalt carbene ion: reactions of Co+ with C2H4, cyclo-C3H6 and cyclo-C2H4O | An ion beam apparatus is employed to study the formation of the cobalt carbene ion, CoCH2+. This ion is produced in the endothermic reaction of cobalt ions with ethene and cyclopropane and in an exothermic reaction with ethylene oxide. A model is proposed to account for the dependence of experimenta... | Cobalt carbine; Ion beam; Bond dissociation energy; Reaction cross section; Endothermic reactions | 1981 |
| 232 |
 |
Stang, Peter J. | Self-selected formation of single discrete supramolecules with flexible, bidentate ligands in the coordination-driven self-assembly | Flexible donor ligands like 1,2-bis(3-pyridyl)ethyne or 1,4-bis(3-pyridyl)-1,3-butadiyne selfassemble into discrete 2-D supramolecules instead of infinite networks upon combination with organoplatinum 90, 120, and 180 degree acceptor units. These systems are unique examples of versatile pyridine... | Bidentate ligands; Flexible donor ligands; Supramolecules; Coordination-driven self-assembly | 2008 |
| 233 |
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Miller, Joel Steven; Epstein, Arthur J. | New polymorph of 4,4'-(Butadiyne-1,4-diyl)-bis-(2,2,6,6-tetramethyl-4-hydroxypiperidin-1-oxyl) | A new polymorph of the title diradical has been characterized by X-ray diffraction, vibrational spectroscopy, and magnetic susceptibility; its radiation induced polymerization has not been achieved, but thermal treatment turns the crystals black and explosive decomposition occurs at-140 °C. | Ferromagnetic; Polymerization; Magnetic | 1988 |
| 234 |
 |
Miller, Joel Steven; Epstein, Arthur J.; Zhang, Jie | Reentrance in the Mn(tetracyanoethylene)x.y(CH2Cl2) high-Tc molecule-based ferrimagnet | Results of static and dynamic magnetic studies of the compound Mn(TCNE)x•y(CH2Cl2) (TCNE =tetracyanoethylene) are reported. Curie-Weiss analysis of the high-temperature susceptibility data indicates a relatively strong exchange. The ac susceptibility, measured as a function of frequency and tempe... | Transition; Reentrant; Magnetic | 1998 |
| 235 |
 |
Miller, Joel Steven ; Epstein, Arthur J. | Thermoelectric-power studies of (N-Methylphenazinium)x(Phenazine)1-x(Tetracyanoquinodimethanide), (0.5 <_ x <_ 1.0) | Temperature-dependent thermoelectric-power (S) studies of (N-methylphenaziniurn)(x)- (phenazine) (1-x) (tetracyanoquinodimethanide) [(NMP)x(phen) (1-x)(TCNQ) 1 show that for x = 0.5, S(T) is indentical to that of (quinolinium) (TCNQ)2. S(T) for 0.5 <x < 1.0 is intermediate between that of (NMP)(TC... | Semiconducting; Doping | 1979 |
| 236 |
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Armentrout, Peter B. | Infrared multiple photon dissociation spectroscopy of cationized methionine: effects of alkali-metal cation size on gas-phase conformation | Please note that as of 11-07-2012, access to this article through USpace had to be restricted. The gas-phase structures of alkali-metal cation complexes of the amino acid methionine (Met) as well as protonated methionine are investigated using infrared multiple photon dissociation (IRMPD) spectros... | | 2010 |
| 237 |
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Miller, Joel Steven | Three-dimensional network-structured cyanide-based magnets | Introduction Magnets based on metal oxides have been important for hundreds of years. Magnetite, Fe3O4, Co-doped (y)-Fe2O3, and CrO2 are important examples. The oxide (O2-) bridge between the magnetic metal ions has filled p orbitals (Figure 1a) that provide the pathway for strong spin coup... | Magnetic; Ferrimagnetic; Magnetization | 2000 |
| 238 |
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Miller, Joel Steven; Epstein, Arthur J. | Lattice- and spin-dimensionality crossovers in a linear-chain-molecule-based ferrimagnet with weak spin anisotropy | [MnOEP][HCBD], a member of the metalloporphyrin family of donor-acceptor molecule-based magnets, consists of isolated ferrimagnetic chains of alternating S=2, [MnOEP], and s=1/2, [HCBD] units (OEP=octaethylporphyrinato and HCBD=hexacyanobutadiene). Analysis of the exchange pathways reveals an exchan... | Magnetic; Magnetization; Interchain | 1997 |
| 239 |
 |
Miller, Joel Steven; Epstein, Arthur J. | Noise-power studies of the nearly commensurate quasi-one-dimensional conductor (N-methylphenazinium)x(phenazine)1-x(7,7,8,8-tetracyano-p-quinodimethane) [(NMP)x(Phen)1-x(TCNQ) | We report the noise power of (NMP)x(Phen)1-x(TCNQ) as a function of temperature (100 <_ T <_ 300 K), frequency (1<_f<_10(4) Hz), electric field (0 <_E<_300 V/cm), and conduction-electron density (0.49<_x<_0.59). The results for the commensurate, doped commensurate, and incommensurate regimes are sim... | Fluctuations; Solitons | 1985 |
| 240 |
 |
Morse, Michael David | Spectroscopy and electronic structure of jet-cooled Al? | Resonant two-photon ionization spectroscopy has been used to study the jet-cooled Al? molecule. The ground state has been conclusively demonstrated to be of 3IIu symmetry, deriving from the ???rr?u electronic configuration. High resolution studies have established the bond length of the X?IIu state ... | | 1990 |
| 241 |
 |
Miller, Joel Steven; Epstein, Arthur J. | Magnetic behavior of octaethylporphyrinatomanganese(III) tetracyanoethenide, [MnOEP][TCNE], and hexacyanobutadienide, [MnOEP][C4(CN)6]: the importance of a uniform chain for stabilizing strong effective ferromagnetic coupling | [MnOEP][A] {A=[TCNE]'- and [C4(CN)6]'-} have been isolated as extended 1D coordination polymers with trans-U2"[A] bridging ligands with strong {A=[C4(CN)6].-} and weak {A=TCNE].-} ferromagnetic coupling as evidenced from the fit of the magnetic susceptibility to the Curie-Weiss law (0=5.1 and 67.1 K... | Crystals; Inversion; Coupling | 1995 |
| 242 |
 |
Miller, Joel Steven; Epstein, Arthur J. | X-ray observation of crossover of 2kF to 4kF scattering in (N-Methylphenazinium)x(Phenazine)1-x(Tetracyanoquinodimethane) [(NMP)x(Phen)1-x(TCNQ)], 0.5 (< _x <_ 1.0) | We report the temperature-dependent x-ray diffuse scattering of (NMP),(Phen)(1-x-)(TCNQ) as a function of conduction-electron density (x). With decreasing x three different unique electronic instability regimes are successively observed on the TCNQ chains: (i) the 2kF instability for (2/3<_x<_1, (ii... | Conduction-electron; Electron density; Chain | 1982 |
| 243 |
 |
Baehr, Wolfgang; Prestwich, Glenn D. | Photoreceptor cGMP phosphodiesterase delta subunit (PDEdelta) functions as a prenyl-binding protein | Bovine PDEdelta was originally copurified with rod cGMP phosphodiesterase (PDE) and shown to interact with prenylated, carboxymethylated C-terminal Cys residues. Other studies showed that PDEdelta can interact with several small GTPases including Rab13, Ras, Rap, and Rho6, all of which are prenylate... | Fluorescence Resonance Energy Transfer; GTP Phosphohydrolases; Immunohistochemistry | 2004 |
| 244 |
 |
Armentrout, Peter B. | Threshold collision-induced dissociation of hydrated cadmium (II): experimental and theoretical investigation of the binding energies for Cd2+(H2O)n complexes (n = 4-11) | The first experimentally determined hydration energies of Cd2+(H2O)n complexes, n = 4 - 11, are measured using threshold collision-induced dissociation in a guided-ion-beam tandem mass spectrometer coupled with an electrospray-ionization source. Kinetic-energy-dependent cross-sections are obtained a... | Hydrated cadmium; Collision-induced dissociation; Hydration energies; Cadmium complexes | 2010-02 |
| 245 |
 |
Poulter, Charles Dale | Prenyltransferase. Kinetic studies of the 1'-4 coupling reaction with avian liver enzyme. | Prenyltransferase catalyzes the sequential, irreversible 1'-4 condensation of isopentenyl-PP with dimethylallyl-PP and geranyl-PP to yield farnesyl-PP. A kinetic study shows substrate inhibition by isopentenyl-PP at concentrations above 0.7 microM when the concentration of geranyl-PP is 1.0 microM o... | Birds; Kinetics; Structure-Activity Relationship; Substrate Specificity | 1979-10-10 |
| 246 |
 |
Miller, Joel Steven | Charge transfer complexes of 2,4,6-tricyano-s-triazine with tetrathiafulvalene (TTF) and N,N,N' ,N'-tetramethyl-p-phenylenediamine (TMPD) | Reaction of 2,4,6-tricyano-s-triazine (TCT) with tetrathiafulvalene (TTF) and N,N,N',N'-tetramethylp-phenylenediamine (TMPD) leads to 1 : 1 charge transfer complexes. The crystal structures of the TTF[TCT], as well as the decomposition product due to hydrolysis of the [TMPD][TCT], i.e. HTMPD]+[2,4-d... | Electron; Solution; Hydrolysis | 2002 |
| 247 |
 |
Miller, Joel Steven; Epstein, Arthur J. | Spin frustration and metamagnetic behavior in a molecular-based quasi 1-D-ferrimagnetic chain: (MnTPP)(TCNE) | We report an experimental observation of spin frustration and metamagnetic behavior in a quasi-1D ferrimagnetic chain, (MnTPP) + (TCNE) -. Metastability, hysteresis effects, and irreversibility of thermal and magnetic histories are observed in magnetization measurements. The "memory" phenomenon is ... | Magnetic; Magnetization; Anisotropy | 1993 |
| 248 |
 |
Stang, Peter J. | Self-assembly of coordinative supramolecular polygons with open binding sites | The design and synthesis of coordinative supramolecular polygons with open binding sites is described. Coordination-driven self-assembly of 2,6-bis(pyridin-4-ylethynyl)pyridine with 60? and 120? organoplatinum acceptors results in quantitative formation of a supramolecular rhomboid and hexagon, resp... | | 2010 |
| 249 |
 |
Morse, Michael David | Rotational analysis of the 30 1 band of the Ã6Σ+ ← X̃6Σ + system of CrCCH | The spectrum of chromium acetylide, CrCCH, has been investigated in the near-infrared region (10 500-14 500 cm−1) and an intense band system is observed. The 310 band of this system has been investigated at high resolution (0.025 cm−1) and this system is identified as the ˜A6 + ← ˜X6 + syste... | | 2014-01-01 |
| 250 |
 |
Armentrout, Peter B. | Theoretical investigation and reinterpretation of the decomposition of lithiated proline and N-Methyl Proline | Lithium cation complexes of proline (Pro) and N-methyl proline (NMP) have been collisionally activated with xenon in a guided ion beam tandem mass spectrometer (GIBMS). In addition to the loss of the intact ligand, Pro and NMP, we observed two prominent fragmentation pathways involving the loss of (... | | 2014-01-01 |
