We report electrochemical studies and the observation of excimer emission from conjugated polymer poly(9,9-dioctylfluorene) (PDOF) in benzene−MeCN solutions during electrogenerated chemiluminescence (ECL). The ECL spectrum resulting annihilation reaction between PDOF radical ions is characterized by two bands, one at 438 nm a broad band centered 610 nm. shorter wavelengths assigned to intrapolymer PDOF, while longer arises excited-state complex formed reaction. relative (the ratio emission)...

We report the novel use of scanning electrochemical microscope (SECM) to follow compression a monolayer monodisperse silver thiol-capped nanoparticles on Langmuir trough. SECM allowed direct visualization lateral connectivity particles in film at air/water interface through monitoring transition from negative feedback (insulating substrate) positive (conducting Pt tip, with ferrocene methanol (FcMeOH) as redox mediator, interparticle separation decreased by compressing film. The an...

Mixed monolayers of a water-soluble tetracationic porphyrin (TMPyP) and an insoluble lipid matrix with anionic head groups (DMPA) were formed by the cospreading method. A ratio TMPyP:DMPA = 1:4 was selected investigation π−area isotherms stability cospread monolayer. Reflection spectroscopy has been used to infer molecular organization molecules in complex monolayer at air−water interface. blue shift Soret band observed increasing surface pressure. The mixed transferred onto glass substrate,...

ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTHydrocarbon Cation Radical Formation by Reduction of PeroxydisulfateEve F. Fabrizio, Inmaculada Prieto, and Allen J. BardView Author Information Department Chemistry Biochemistry University Texas at Austin, 78712 Cite this: Am. Chem. Soc. 2000, 122, 20, 4996–4997Publication Date (Web):May 4, 2000Publication History Received28 January 2000Revised29 March 2000Published online4 May inissue 1...

In this paper, the formation of different aggregates a water-soluble tetracationic porphyrin, TMPyP, anchored to an anionic phospholipid matrix, DMPA, and assembled in LB films has been investigated. The use solid substrates such as hydrophilic glass supports modified by transfer monolayers several lipids employed assemble TMPyP molecules mixed monolayer with DMPA (in molar ratio 1:4) monomer (TMPyP4+), dimer, diprotonated (TMPyPH26+), tetramer aggregates. porphyrin is organized (TMPyP4+)...

The organization of a cationic water-soluble porphyrin, TMPyP, in complex monolayer containing an anionic phospholipid, DMPA, at the air−water interface has been directly inferred by Brewster angle microscopy, BAM. In previous work (Martín, M. T.; Prieto, I.; Camacho, L.; Möbius, D. Langmuir 1996, 12, 6554) this mixed TMPyP/DMPA, ratio 1:4, was explained on basis model where TMPyP molecules are monomer−dimer equilibrium depending surface pressure, that is, density analysis π−A isotherms and...

In this work, the influence of different ionic strengths in aqueous subphase on monomer−dimer equilibrium a water-soluble tetracationic porphyrin, TMPyP, complex monolayer containing an insoluble lipid with negatively charged group, DMPA, has been investigated. LiCl, KClO4, and tetraethylammonium perchlorate, TEAP, have used. Surface pressure−area, π−A, surface potential−area, ΔV−A, isotherms measured presence salts subphase. As reference, DMPA absence TMPyP was studied by π−A ΔV−A those...

Films of a water-soluble tetracationic porphyrin (TMPyP) and an insoluble phospholipid (DMPA), in molar ratio TMPyP:DMPA = 1:4, were transferred onto optically transparent indium tin oxide (ITO) electrodes, cyclic voltammetry visible spectroscopy used to detected quantify the presence on ITO supports. We found surface density deposited ranges from that corresponding monolayer monomers lying parallel electrode total amount (partially as dimer) present compressed at air−water interface. Also,...

The conformational behaviour of mixtures the metallated Ni-TMPyP/DMPA and Co-TMPyP/DMPA, with molar ratio 1∶4, has been investigated at air–water interface. In order to characterize interactions TMPyP derivatives DMPA, different surface methods have used. Thus, pressure–surface area, π–A, potential–surface ΔV–A, isotherms were measured valuable information about presence porphyrin molecules underneath lipid matrix as well stability hysteresis phenomena these monolayers was obtained. To...

New chiral and achiral 1D coordination polymers based on glycolato chelating aromatic diamine ligands.

The reaction of [Ru2Cl2(μ-Cl)2(η6-p-cymene)2] with two thiosemicarbazones obtained by the condensation N-(4-methoxybenzyl) thiosemicarbazide and 1,4-hydroxy-3-methoxyphenyl)ethan-1-one (HL1) or 2-fluoro-4-hydroxybenzaldehyde (HL2) was studied. cationic complexes formula [RuCl(η6-p-cymene)(HL)]+ were isolated as solid chloride trifluoromethylsulfate (TfO) salts. A study state NMR spectra suggests presence in material isomers that differ configuration iminic bond, C2=N3, coordinated...

Three new spirobifluorene iridaaromatic compounds bearing electron-withdrawing or electron-donor substituents another iridanaphthalene moiety have been synthesized and structurally characterized. Thorough experimental theoretical evaluation revealed that these novel systems present a high thermal, air electrochemical stability as well low optical electronic energy gap values with significant redshift of the absorption maximum in UV-Vis spectra predicted remarkably higher first...

Three coordination compounds from the reaction of copper(II) bromide with flexible bis-tetrazole organosulfur ligand, 1,2-bis(1-methyl-1H-tetrazole-5-ylthio)ethane (bmtte) have been isolated and characterised. The identification polymeric 2∞Cu2Br4(bmtte) (1), trinuclear [Cu3Br4(bmtte)2] (2) tetranuclear [Cu2Br2(bmtte)]2 (3) shows that conditions a significant influence on structure complexes formed. Moreover, two polymorphs 2D Cu(II)-coordination polymer 1 these crystallise in monoclinic...

Isotherms of surface pressure, π, against mean molecular area, A, were obtained for monolayers gramicidin A (GA), ethyl palmitate (EP), and mixtures the two spread at air−water interface aqueous solutions CaCl2 15, 20, 25 °C. Plots monolayer collapse pressure (πc) mole fraction GA (XGA) both suggest miscibility between EP in working temperatures. The morphology GA, EP, GA/EP on NaCl these temperatures was studied by Brewster angle microscopy. two-dimensional solution containing numerous...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTwo-Dimensional Condensation of Metallotetraphenylporphyrins at the Mercury-DMSO InterfaceInmaculada Prieto, Maria Teresa Martin, Eulogia Munoz, and Luis CamachoCite this: J. Phys. Chem. 1995, 99, 38, 14083–14088Publication Date (Print):September 1, 1995Publication History Published online1 May 2002Published inissue 1 September 1995https://pubs.acs.org/doi/10.1021/j100038a046https://doi.org/10.1021/j100038a046research-articleACS PublicationsRequest...