02343nas a2200241 4500008004100000022001400041245010100055210006900156260007600225300001400301490000700315520144400322653002001766653001501786653001101801653001801812653003301830653005601863100002001919700001901939700001701958856012601975 2011 eng d a0887-624X00aCorrelation of architecture with excimer emission in 100% pyrene-labeled self-assembled polymers0 aCorrelation of architecture with excimer emission in 100 pyrenel aCOMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USAbWILEY-BLACKWELLcAPR a1678-16900 v493 a

Pyrene was incorporated as pendant unit to side-chain urethane methacrylate polymers having a short ethyleneoxy or a long polyethyleneoxy spacer segment. The short-spacer pyrene urethane methacrylate was also incorporated either as block or random copolymer (1:9) along with polystyrene. The excimer emission was observed to be different for different polymers with the random copolymer exhibiting the lowest efficiency. But, the total quantum yield was highest (phi = 0.58) for random copolymer due to the high emission coefficient of monomer compared to that of excimer. The polymer dynamics were compared by steady state emission and fluorescence decay in THF or THF/water (9:1) solvent mixture and films. The solid state decay profile showed decay without a rise time indicating presence of ground state aggregates. In THF/water (9:1), the decay profile at the excimer emission (500 nm) showed a rise time indicating dynamic excimers. The evolution of excimeric emission centred similar to 430 or similar to 480 nm as a function of temperature was also studied in THF/water (9:1). The I(E)/I(M) ratio for the lambda(343) nm excitation exhibited steady increase with temperature with the block copolymer PS-b-PIHP exhibiting the highest ratio and highest rate of increase; whereas, the random copolymer PS-r-PIHP had the lowest I(E)/I(M) ratios. (C) 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 49: 1678-1690, 2011

10aI(E)/I(M) ratio10aMorphology10apyrene10aSelf-assembly10astructure-property relations10atime-resolved and variable temperature fluorescence1 aKaushlendra, K.1 aDeepak, V., D.1 aAsha, S., K. uhttps://library.ncl.res.in/content/correlation-architecture-excimer-emission-100-pyrene-labeled-self-assembled-polymers-002444nas a2200265 4500008004100000022001400041245015200055210006900207260006700276300001400343490000700357520143400364653001901798653002901817653000901846653002101855653001801876653003301894653003201927653003001959100001501989700002802004700001702032856012902049 2016 eng d a0887-624X00aP4VP and oligo(phenylenevinylene)-perylenebisimide mixed donor-acceptor supramolecular comb polymer complexes with improved charge carrier mobility0 aP4VP and oligophenylenevinyleneperylenebisimide mixed donoraccep a111 RIVER ST, HOBOKEN 07030-5774, NJ USAbWILEY-BLACKWELLcAUG a2403-24120 v543 a

Random donor-acceptor (D-A) supramolecular comb polymers were formed when hydroxyl functionalized donor and acceptor small molecules based on Oligo(phenylenevinylene) (named OPVCN-OH) and Perylenebisimide (named UPBI-PDP), respectively, were complexed with Poly(4-vinyl pyridine) (P4VP). A series of random D-A supramolecular comb polymers were formed by varying the ratios of UPBI-PDP and OPVCN-OH with P4VP. A 100% P4VP-donor polymer complex [P4VP(OPV1.00)] and a 100% P4VP-acceptor polymer complex [P4VP(UPBI1.00)] were also synthesized and characterized. Complex formation was confirmed by FT-IR and H-1 NMR spectroscopy. Solid state structural studies carried out using small angle X-ray scattering and wide angle X-ray diffraction experiments revealed altered packing of the D and A molecules in the complexes. Transmission electron microscopy images showed lamellar structures in the <10 nm scale for the P4VP(OPV1.00), P4VP(UPBI1.00), and mixed P4VP (D-A) complexes. The effect of the nanoscopic D-A self-assembly on the bulk mobility of the materials was probed using SCLC measurements. The mixed D-A random complexes exhibited ambipolar charge transport characteristics with higher values for the average bulk hole mobility estimate. P4VP(OPV0.25+UPBI0.75) exhibited an average hole mobility in the order of 10(-2) cm(2) V-1 s(-1) and electron mobility 10(-5) cm(2) V-1 s(-1). (C) 2016 Wiley Periodicals, Inc.

10adonor-acceptor10aoligo(phenylenevinylene)10aP4VP10aPerylenebisimide10aSelf-assembly10astructure-property relations10asupramolecular comb polymer10asupramolecular structures1 aSaibal, B.1 aChithiravel, Sundaresan1 aAsha, S., K. uhttps://library.ncl.res.in/content/p4vp-and-oligophenylenevinylene-perylenebisimide-mixed-donor-acceptor-supramolecular-comb02312nas a2200277 4500008004100000022001400041245010400055210006900159260000800228300001200236490000700248520139100255653002301646653002701669653002101696653002901717653000901746653001801755653002901773653003001802100001501832700001901847700002001866700001701886856013101903 2017 eng d a0887-624X00aLiquid crystalline supramolecular crosslinked polymer complexes of ditopic rylenebisimides and P4VP0 aLiquid crystalline supramolecular crosslinked polymer complexes  cMAR a951-9590 v553 a

Perylenebisimide and naphthalenebisimide (PBIPDP and NBI-PDP) end functionalized with pentadecyl phenol is designed as ditopic hydrogen bonding acceptors to form supramolecular crosslinked network with poly(4-vinyl pyridine) (P4VP). The pristine PBI-PDP has been grown as single crystals from DCM-MeOH (dichloromethane-methanol) mixture at room temperature, which revealed a P21 space group. Noticeably, the pentadecyl alkyl chain shields the aromatic perylene core on both sides resulting in the absence of p-p interaction in single-crystal assembly. The naphthalenebisimide derivative exhibits thermotropic liquid crystalline behavior, while both the molecules exhibits lyotropic liquid crystalline phases in tetrahydrofuran (THF), which were characterized using a combination of differential scanning calorimeter, X-ray diffraction, and polarized light microscopy. The hydrogen-bonded complex of both the rylenebisimides with P4VP preserves the mesomorphic properties in THF. The electron transport mobility measured by space charge limited current measurements reveals a two orders of magnitude increase in the charge transport in the P4VP complex compared to that of the pristine molecule. The average electron mobility obtained is mu(e, avg): 10(-3) cm(2)/Vs for P4VP-PBI compared to mu(e, avg): 10(-5) cm(2)/Vs for pristine PBI derivative. (C) 2017 Wiley Periodicals, Inc.

10acrystal structures10aditopic rylenebisimide10ahydrogen bonding10alyotropic liquid crystal10aP4VP10aSelf-assembly10asupramolecular crosslink10asupramolecular structures1 aSaibal, B.1 aNarayan, Rekha1 aChithiravel, S.1 aAsha, S., K. uhttps://library.ncl.res.in/content/liquid-crystalline-supramolecular-crosslinked-polymer-complexes-ditopic-rylenebisimides-and02139nas a2200265 4500008004100000022001400041245015200055210006900207260000800276300001200284490000600296520121100302653002601513653002801539653001601567653001301583653002001596653001401616653001801630100001701648700003501665700002601700700001701726856013001743 2020 eng d a2637-610500aSelf-assembly of bispentadecylphenol substituted perylenediimide with PS-b-P4VP for structure-property insight into the core of core-shell micelles0 aSelfassembly of bispentadecylphenol substituted perylenediimide  cFEB a805-8160 v23 a

We report the use of a ditopic molecular probe bispentadecylphenol substituted perylenediimide (PBI-PDP) to examine the molecular level self-assembly of polystyrene-b-poly(4-vinylpyridine) (PS-b-P4VP) in tetrahydrofuran (THF). A series of complexes were prepared between PS-b-P4VP copolymers with varying lengths of the 4-vinylpyridine chain and PBI-PDP. Light scattering and NMR spectroscopic studies reveal that the self-assembled structures of the solid complexes are not fully disrupted when the complexes are dissolved in THF. NMR experimental parameters measured for the small probe molecule provide detailed insights into the structure of the assemblies in solution as well as the interaction between the small molecule and the block copolymer. Such insights can have important implications in manipulating the nanostructure of block copolymer micelles to suit various application requirements. The dynamics and distribution of the PBI-PDP molecules within the assemblies in solution show a dependence on the length of the P4VP block. Transmission electron microscopy was employed to study the evolution of morphologies in films prepared from the self-assembled structures in THF solutions.

10acore corona interface10aditopic molecular probe10aenvironment10amicelles10aperylenediimide10aPS-b-P4VP10aSelf-assembly1 aRoy, Moumita1 aRajamohanan, Pattuparambil, R.1 aRavindranathan, Sapna1 aAsha, S., K. uhttps://library.ncl.res.in/content/self-assembly-bispentadecylphenol-substituted-perylenediimide-ps-b-p4vp-structure-property