Optical concentration can lower the cost of solar energy conversion by reducing photovoltaic cell area and increasing efficiency. Luminescent concentrators offer an attractive approach to combined spectral spatial both specular diffuse light without tracking, but they have been plagued luminophore self-absorption losses when employed on practical size scales. Here, we introduce doped semiconductor nanocrystals as a new class phosphors for use in luminescent concentrators. In proof-of-concept...

Typical high throughput microarrays experiments compare gene expression across two specimen classes - an experimental class and baseline (or comparison) class. The choice of is a major factor in the differential patterns revealed by these experiments. In most studies prostate cancer, histologically malignant tissue chosen as while normal appearing adjacent to tumor (adjacent normal) against which comparison made. However, from free organ donors represents alterative source for studies.

The trans-Fe(DMeOPrPE)2Cl2 complex (where DMeOPrPE = 1,2-bis(bis(methoxypropyl)phosphino)ethane) undergoes a series of reactions that involve the activation both H2 and N2 to produce ammonia hydrazine. A Leigh-type cycle was employed achieve laboratory fixation dinitrogen at room temperature pressure utilizing as reductant.

Thiol monolayer-protected Au clusters (MPCs) were prepared using dendrimer templates, deposited onto a high-surface-area titania, and then the thiol stabilizers removed under H2/N2. The resulting catalysts characterized with transmission electron microscopy, X-ray photoelectron spectroscopy, infrared spectroscopy of adsorbed CO. via this route displayed minimal particle agglomeration during deposition activation steps. Structural data obtained from physical characterization comparable to...

Monolayer-protected metal nanoclusters (MPCs) were investigated to probe their fundamental excitation and emission properties. In particular, gold MPCs probed by steady-state time-resolved spectroscopic measurements; the results used examine mechanism of in relation excited states these systems. measurements, photoluminescence clusters range 25 140 atoms was considerably stronger relative larger particle analogues. The increase efficiency (for Au25, Au55, Au140 on order 10−5) over bulk may...

ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSterically Engineered Perylene Dyes for High Efficiency Oriented Fluorophore Luminescent Solar ConcentratorsWillie E. Benjamin†, Darren R. Veit†, Matt J. Perkins†, Edward Bain†, Kelsey Scharnhorst†, Stephen McDowall‡, David L. Patrick*†, and John D. Gilbertson*†View Author Information†Department of Chemistry ‡Department Mathematics, Western Washington University, Bellingham, 98225, United States*E-mail: [email protected]*E-mail:...

The intermolecular N-N coupling of NO in a dinitrosyl iron complex (DNIC) induced by hydrogen bond donors the secondary coordination sphere to form N2O is reported. A family complexes containing pendant anilines were synthesized and characterized. Reduction {Fe(NO)2}9 [Fe(PhNHPDI)(NO)2][BPh4] (3) {Fe(NO)2}10 Fe(PhNHPDI)(NO)2 (4) results N2O. Similar reactions control [Fe(PhNMePDI)(NO)2][BPh4] (7), which does not have H-bonding groups sphere, do result formation. bonding capabilities explored...

New bimetallic Ni−Au supported nanoparticle catalysts were prepared by using dendrimer templated nanoparticles. Amine-terminated generation 5 polyamidoamine (PAMAM) dendrimers anchored to a commercial silica with siloxane linked anhydride. The was then alkylated and used template nanoparticles, which subsequently extracted into organic solution as thiol monolayer protected clusters (MPCs). Transmission electron microscopy (TEM) energy dispersive spectroscopy (EDS) indicated nanoparticles of...

Metal complexes composed of redox-active pyridinediimine (PDI) ligands are capable forming ligand-centered radicals. In this Forum article, we demonstrate that integration these types sites with bioinspired secondary coordination sphere motifs produce direduced complexes, where the reduction potential ligand-based redox is uncoupled from sphere. The utility such ligand design was explored by encapsulating redox-inactive Lewis acidic cations via installation a pendant benzo-15-crown-5 in...

The reactions of the trans-Fe(DMeOPrPE)2Cl2 complex (I; DMeOPrPE = 1,2-bis(bis(methoxypropyl)phosphino)ethane) and its derivatives were studied in aqueous nonaqueous solvents with a particular emphasis on binding activation H2 N2. results show there are distinct differences reaction pathways between solvents. In water, I immediately reacts to form trans-Fe(DMeOPrPE)2(H2O)Cl+. Subsequent or N2 yields trans-Fe(DMeOPrPE)2(X2)Cl+ (X2=H2 N2). case H2, further reactivity occurs ultimately give...

A synthetic cycle for the CO2-to-CO conversion (with subsequent release of CO) based on iron(II), a redox-active pydridinediimine ligand (PDI), and an O-atom acceptor is reported. This passive-type ligand-based reduction, where electrons CO2 are supplied by reduced PDI ferrous state iron conserved.

Utilizing the proton-responsive pyridinediimine ligand [(2,6-ⁱPrC₆H₃)(NCMe)(N(ⁱPr)₂C₂H₄)(NCMe)C₅H₃N] (didpa), ligand-based reduction of nitrate (NO₃⁻) to nitric oxide (NO) was achieved.

The reduction of NO₂⁻ to NO is achieved with a FePDI complex containing proton-responsive secondary coordination sphere coupled redox-active sites.

Utilizing the pyridinediimine ligand [(2,6-iPrC6H3)N═CMe)(N(iPr)2C2H4)N═CMe)C5H3N] (didpa), iron(II) complexes Fe(didpa)Br2 (1), [Fe(Hdidpa)Br2][PF6] (2), and [Fe(Hdidpa)CH3CN(OH)][2PF6] (3) were synthesized characterized by X-ray diffraction spectroscopic methods. The data show that didpa scaffold is capable of forming intramolecular hydrogen bonds in solid state located within secondary coordination sphere 2 3. These are responsible for stabilizing hydroxo 3, which originates from H2O.

A series of pyridinediimine (PDI) iron complexes that contain a pendant 15-crown-5 located in the secondary coordination sphere were synthesized and characterized. The complex Fe((15c5)PDI)(CO)2 (2) was shown both solid state solution to encapsulate redox-inactive metal ions. Modest shifts reduction potential metal-ligand scaffold observed upon encapsulation either Na(+) or Li(+).

Hydrogen sulfide (H2S) has gained recent attention as an important biological analyte that interacts with bioinorganic targets. Despite this importance, stable H2S or HS(-) adducts of metal complexes remain rare due to the redox activity and its propensity form insoluble sulfides. We report here reversible coordination Zn(didpa)Cl2, which is enabled by intramolecular hydrogen bond between zinc hydrosulfido product pendant tertiary amine didpa ligand.

Incorporation of the triad redox activity, hemilability, and proton responsivity into a single ligand scaffold is reported. Due to this triad, complexes Fe(

A set of distorted square planar Cu(<sc>i</sc>) complexes were synthesized and characterized utilizing the sterically encumbering pyridinediimine ligand, ^iPrPDI (where = 2,6-(2,6-ⁱPr₂C₆H₃NCMe)₂C₅H₃N).

The reactions of the water-soluble chelating phosphines 1,2-bis(bis(hydroxyalkyl)phosphino)ethane (alkyl = n-propyl, DHPrPE; n-butyl, DHBuPE; n-pentyl, DHPePE) with FeCl(2).4H(2)O and FeSO(4).7H(2)O were studied as routes to complexes that will bind small molecules, dinitrogen in particular. products form their stereochemistry depend on solvent, counteranion, alkyl chain length phosphine. In alcoholic solvents, reaction 2 equiv DHBuPE or DHPePE gave trans-Fe(L(2))(2)Cl(2). analogous water...

The water-soluble iron phosphine complex trans-Fe(DMeOPrPE)(2)Cl(2) (DMeOPrPE = 1,2-bis(bis(methoxypropyl)phosphino)ethane) reacts with H(2) in water to produce trans-[Fe(DMeOPrPE)(2)H(H(2))](+) and H(+). product is a eta(2)-H(2) metal hydride complex, formed via the heterolysis of coordinated water.

Utilizing the pyridinediimine ligand [(2,6-iPrC6H3)N═CMe)(N(iPr)2C2H4)N═CMe)C5H3N] (didpa), zinc(II) and iron(II) complexes Zn(didpa)Cl2 (1), Fe(didpa)Cl2 (2), [Zn(Hdidpa)Cl2][PF6] (3), [Fe(Hdidpa)Cl2][PF6] (4), Zn(didpa)Br2 (5), [Zn(Hdidpa)Br2][PF6] (6), Fe(didpa)(CO)2 (7), [Fe(Hdidpa)(CO)2][PF6] (8) were synthesized characterized. These allowed for study of secondary coordination sphere pendant base redox-activity didpa scaffold. The protonated is capable forming metal halogen hydrogen...