Search Results - "Helgeson, R."

An Unusual Electrochromic Device Based on a New Low-Bandgap Conjugated Polymer by Meng, H., Tucker, D., Chaffins, S., Chen, Y., Helgeson, R., Dunn, B., Wudl, F.

“…A new low‐bandgap conjugated polymer is synthesized (see Figure for structure). It is transparent, easily processed, and exhibits electrochromic behavior…”
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Tetramethylpentacene: Remarkable Absence of Steric Effect on Field Effect Mobility by Meng, H., Bendikov, M., Mitchell, G., Helgeson, R., Wudl, F., Bao, Z., Siegrist, T., Kloc, C., Chen, C.-H.

“…A new pentacene derivative, 2,3,9,10‐tetramethyl‐pentacene (Me4PENT), has been synthesized, characterized, and tested in a field‐effect transistor (FET) device…”
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Dual-color polymer light-emitting pixels processed by hybrid inkjet printing by Chang, Shun-Chi, Bharathan, Jayesh, Yang, Yang, Helgeson, Roger, Wudl, Fred, Ramey, Michael B., Reynolds, John R.

“…A hybrid inkjet printing (HIJP) technology, which combines a pin-hole free polymer buffer layer and an inkjet printed polymer layer, allows the patterning of…”
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One-, two-, and three-photon pumped lasing in a novel liquid dye salt system by He, G.S., Helgeson, R., Lin, T.-C., Qingdong Zheng, Wudl, F., Prasad, P.N.

“…We report the observation of one-, two-, and three-photon pumped lasing in the same medium, a novel liquid dye salt system when excited by pulsed 0.532-,…”
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High-Yield Formation of Giant Bis(bicyclic) and Crypt-tris(bicyclic) Molecules under Normal Reaction Conditions by Dam, Matheus Adrianus, Weitz, Amir, Helgeson, Roger, Ma, Bin, Wudl, Fred

“…We report the unexpected result of the reaction of 1,3-bis[(9-anthrylmethoxy)methyl]benzene (1a) or 1,3,5-tris[(9-anthrylmethoxy)methyl]benzene (1b) with…”
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Highly Sensitive Biological and Chemical Sensors Based on Reversible Fluorescence Quenching in a Conjugated Polymer by Chen, Liaohai, McBranch, Duncan W., Wang, Hsing-Lin, Helgeson, Roger, Wudl, Fred, Whitten, David G.

“…The fluorescence of a polyanionic conjugated polymer can be quenched by extremely low concentrations of cationic electron acceptors in aqueous solutions. We…”
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The lithium chloride complex of the anti isomer of the bridged spherand C50H48O6 by Helgeson, Roger C., Knobler, Carolyn B., Maverick, Emily F., Trueblood, Kenneth N.

“…The structure of…”
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Hemicarcerands containing tosylamide bridges by Cram, Donald J, Helgeson, Roger C, Knobler, Carolyn B, Maverick, Emily F

“…Two new hemicarcerand hosts with tosylamide bridges are found to be relatively selective binders. The tosyl groups could not be removed without destroying the…”
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State-coordinated services for traumatic brain injury survivors: toward a model delivery system by Murrey, G J, Helgeson, S R, Courtney, C T, Starzinski, D T

“…Since 1985, the state of Minnesota, through a variety of advocacy, legislative, and interagency efforts, has made incremental gains in public policy and…”
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Superquenching in Cyanine Pendant Poly(l-lysine) Dyes:  Dependence on Molecular Weight, Solvent, and Aggregation by Lu, Liangde, Helgeson, Roger, Jones, Robert M, McBranch, Duncan, Whitten, David

“…A series of poly(l-lysines) ranging in number of repeat units (N PRU) from 6 to 900 has been synthesized and the photophysics of the series and monomer cyanine…”
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Synthesis and Optical Properties of Cross-Conjugated Bis(dimethylaminophenyl)pyridylvinylene Derivatives by Wang, Hailiang, Helgeson, Roger, Ma, Bin, Wudl, Fred

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Building Highly Sensitive Dye Assemblies for Biosensing from Molecular Building Blocks by Jones, Robert M., Lu, Liangde, Helgeson, Roger, Bergstedt, Troy S., McBranch, Duncan W., Whitten, David G.

“…Fluorescence superquenching is investigated for polyelectrolytes consisting of cyanine dye pendant polylysines ranging in number of polymer repeat units (NPRU)…”
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Ultrafast competition between energy and charge transfer in a functionalized electron donor/fullerene derivative by Martini, Ignacio B., Ma, Bin, Da Ros, Tatiana, Helgeson, Roger, Wudl, Fred, Schwartz, Benjamin J.

“…The fact that fullerenes are good electron acceptors has generated interest in covalently linked complexes between electron donors and fullerenes; photoinduced…”
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Chiral recognition in complexation of guests by designed host molecules by Cram, D. J., Helgeson, R. C., Sousa, L. R., Timko, J. M., Newcomb, M., Moreau, P., de Jong, F., Gokel, G. W., Hoffman, D. H., Domeier, L. A., Peacock, S. C., Madan, Khorshed, Kaplan, Lester

“…Abstract…”
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A prospective randomized comparison of laparoscopic appendectomy with open appendectomy : Clinical and economic analyses by LONG, Kirsten Hall, BANNON, Michael P, ZIETLOW, Scott P, HELGESON, Eva R, HARMSEN, William S, SMITH, C. Daniel, ILSTRUP, Duane M, BAERGA-VARELA, Yvonne, SARR, Michael G

“…Previous randomized studies of laparoscopic appendectomy produced conflicting recommendations, and the adequacy of sample sizes is generally unknown. We…”
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Host-guest complexation. 18. Effects on cation binding of convergent ligand sites appended to macrocyclic polyethers by Helgeson, Roger C, Weisman, Gary R, Toner, John L, Tarnowski, Thomas L, Chao, Y, Mayer, James M, Cram, Donald J

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Controlled unidirectional energy transfer in luminescent self-assembled conjugated polymer superlattices by Wang, Hsing-Lin, McBranch, Duncan W., Klimov, Victor I., Helgeson, Roger, Wudl, Fred

“…We report the synthesis and characterization of multi-layered organic superlattices made by polyelectrolyte self-assembly. Self-assembled films were formed…”
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Synthesis, X-ray Structure, and Properties of a Tetrabenzannelated 1,2,4,5-Cyclophane by Brettreich, Michael, Bendikov, Michael, Chaffins, Sterling, Perepichka, Dmitrii F., Dautel, Olivier, Duong, Hieu, Helgeson, Roger, Wudl, Fred

“…Highly strained but thermally stable: Tetrabenzocyclophane 1, which was obtained in a four‐step synthesis by two Diels–Alder addition reactions (see scheme)…”
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A prospective randomized comparison of laparoscopic appendectomy with open appendectomy: Clinical and economic analyses by Long, Kirsten Hall, Bannon, Michael P., Zietlow, Scott P., Helgeson, Eva R., Harmsen, William S., Smith, C.Daniel, Ilstrup, Duane M., Baerga-Varela, Yvonne, Sarr, Michael G.

“…Background. Previous randomized studies of laparoscopic appendectomy produced conflicting recommendations, and the adequacy of sample sizes is generally…”
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Benzocyclobutenoacenaphthylene Stilbenes. 1. Synthesis and Thermal Properties by Buchacher, Petra, Helgeson, Roger, Wudl, Fred

“…In this paper the synthesis and characterization of a new class of molecules based on 6b,10b-dihydrobenzo[j]cyclobut[a]acenaphthylene (DBCA) with potentially…”
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