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Dive into the research topics where Patrícia S. Lopes is active.

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Featured researches published by Patrícia S. Lopes.


Dalton Transactions | 2016

Boron complexes of aromatic ring fused iminopyrrolyl ligands: synthesis, structure, and luminescence properties

D. Suresh; Bruno Ferreira; Patrícia S. Lopes; Clara S. B. Gomes; Paramasivam Krishnamoorthy; Ana Charas; Diogo Vila-Viçosa; Jorge Morgado; Maria José Calhorda; António L. Maçanita; Pedro T. Gomes

The condensation reactions of 2-formylindole (1) or 2-formylphenanthro[9,10-c]pyrrole (2) with various aromatic amines afforded the corresponding phenyl or phenanthrene ring fused mono-/bis-iminopyrrole ligand precursors 3-8, which, upon reaction with BPh3 in an appropriate molar ratio, led to the new mono- and diboron chelate compounds Ph2B[NC8H5C(H)[double bond, length as m-dash]N-2,6-Ar] (Ar = 2,6-iPr2C6H39; C6H510), Ph2B[(NC8H5C(H)[double bond, length as m-dash]N)2-1,4-C6H4]BPh211, Ph2B(NC16H9C(H)[double bond, length as m-dash]N-Ar) (Ar = 2,6-iPr2C6H312; C6H513), and Ph2B[(NC16H9C(H)[double bond, length as m-dash]N)2-1,4-C6H4]BPh214, respectively. Boron complexes 12-14, containing a phenanthrene fragment fused to the pyrrolyl C3-C4 bond, are highly fluorescent in solution, with quantum efficiencies of 37%, 61% and 58% (in THF), respectively, their emission colours ranging from blue to orange depending on the extension of π-conjugation. Complexes 9-11, containing a benzene fragment fused to the pyrrolyl C4-C5 bond, are much weaker emitters, exhibiting quantum efficiencies of 10%, 7% and 6%, respectively. DFT and TDDFT calculations showed that 2,6-iPr2C6H3N-substituents or, to a smaller extent, the indolyl group prevent a planar geometry of the ligand in the excited state and reveal the existence of a low energy weak band in all the indolyl complexes, which is responsible for the different optical properties. Non-doped single-layer light-emitting diodes (OLEDs) were fabricated with complexes 9-14, deposited by spin coating, that of complex 13 revealing a maximum luminance of 198 cd m-2.


CrystEngComm | 2015

Exploring the influence of steric hindrance and electronic nature of substituents in the supramolecular arrangements of 5-(substituted phenyl)-2-formylpyrroles

Cláudia A. Figueira; Patrícia S. Lopes; Clara S. B. Gomes; Luis F. Veiros; Pedro T. Gomes

A family of 5-(substituted phenyl)-2-formylpyrrole compounds, exhibiting different electronic and steric features at the phenyl ring, was synthesised through the formylation reaction of the corresponding 2-(substituted phenyl)pyrrole precursors, using Vilsmeier–Haack acylation conditions. The products were obtained in moderate to high yields, being systematically characterised by NMR spectroscopy, elemental analysis and single crystal X-ray diffraction. The corresponding crystalline packings were discussed on the basis of three types of arrangements, leading to the formation of dimers, polymers or the newly observed tetramers, all of them essentially governed by strong N–H⋯O hydrogen bonding interactions. Important C–H⋯O, C–H⋯π, π⋯π and, in the case of fluorinated compounds, C–H⋯F interactions also contributed to the growth of the three-dimensional crystalline network. DFT calculations helped to rationalise the relationship between the steric and electronic properties of the molecules and the basic units observed in the corresponding solid state structures.


Acta Crystallographica Section C-crystal Structure Communications | 2011

Iminopyrrole derivatives containing electron-withdrawing substituents: the formation of dimers and supramolecular arrangements

Clara S. B. Gomes; Cláudia A. Figueira; Patrícia S. Lopes; D. Suresh; Pedro T. Gomes; M.T. Duarte

The crystal structures of two p-substituted phenylformiminopyrrole derivatives, namely 2-[(4-fluorophenyl)iminomethyl]pyrrole, C(11)H(9)FN(2), (1), and 2-[(1H-pyrrol-2-ylmethylidene)amino]benzonitrile, C(12)H(9)N(3), (2), bear F and C[triple-bond]N electron-withdrawing groups, respectively. Both structures feature two independent molecules in the asymmetric unit forming dimers via N-H...N hydrogen bonds. In the case of (1), each dimer interacts with two other dimers via C-H...F contacts, thus forming one-dimensional chains in the b direction, whereas in the case of (2), a weak C-H...N interaction connects the dimers in one-dimensional chains in the (110) direction.


Dalton Transactions | 2012

Synthesis and structural characterisation of (aryl-BIAN)copper(I) complexes and their application as catalysts for the cycloaddition of azides and alkynes.

Lidong Li; Patrícia S. Lopes; Vitor Rosa; Cláudia A. Figueira; M.Amélia N.D.A. Lemos; M. Teresa Duarte; Teresa Avilés; Pedro T. Gomes


Chemistry: A European Journal | 2015

Luminescent Di- and Trinuclear Boron Complexes Based on Aromatic Iminopyrrolyl Spacer Ligands: Synthesis, Characterization, and Application in OLEDs.

D. Suresh; Clara S. B. Gomes; Patrícia S. Lopes; Cláudia A. Figueira; Bruno Ferreira; Pedro T. Gomes; Roberto E. Di Paolo; António L. Maçanita; M. Teresa Duarte; Ana Charas; Jorge Morgado; Diogo Vila-Viçosa; Maria José Calhorda


Chemistry: A European Journal | 2014

Tunable Fluorophores Based on 2‐(N‐Arylimino)pyrrolyl Chelates of Diphenylboron: Synthesis, Structure, Photophysical Characterization, and Application in OLEDs

D. Suresh; Patrícia S. Lopes; Bruno Ferreira; Cláudia A. Figueira; Clara S. B. Gomes; Pedro T. Gomes; Roberto E. Di Paolo; António L. Maçanita; M. Teresa Duarte; Ana Charas; Jorge Morgado; Maria José Calhorda


European Journal of Inorganic Chemistry | 2013

Cationic and Neutral (Ar-BIAN)Copper(I) Complexes Containing Phosphane and Arsane Ancillary Ligands: Synthesis, Molecular Structure and Catalytic Behaviour in Cycloaddition Reactions of Azides and Alkynes

Lidong Li; Patrícia S. Lopes; Cláudia A. Figueira; Clara S. B. Gomes; M. Teresa Duarte; Vitor Rosa; Christophe Fliedel; Teresa Avilés; Pedro T. Gomes


European Polymer Journal | 2011

Polymerization of styrene with tetradentate chelated α-diimine nickel(II) complexes/MAO catalyst systems: Catalytic behavior and microstructure of polystyrene

Lidong Li; Clara S. B. Gomes; Patrícia S. Lopes; Pedro T. Gomes; Hermínio P. Diogo; José R. Ascenso


Tetrahedron | 2015

Synthesis of 2-arylpyrroles via catalytic dehydrogenation of 2-aryl-1-pyrrolines in the presence of palladium-supported on alumina

Cláudia A. Figueira; Patrícia S. Lopes; Pedro T. Gomes


Inorganic Chemistry | 2018

Hydroboration of Terminal Olefins with Pinacolborane Catalyzed by New Mono(2-Iminopyrrolyl) Cobalt(II) Complexes

Tiago F.C. Cruz; Patrícia S. Lopes; L.C.J. Pereira; Luis F. Veiros; Pedro T. Gomes

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Pedro T. Gomes

Instituto Superior Técnico

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Clara S. B. Gomes

Instituto Superior Técnico

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M. Teresa Duarte

Instituto Superior Técnico

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Lidong Li

Instituto Superior Técnico

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Ana Charas

Instituto Superior Técnico

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Bruno Ferreira

Instituto Superior Técnico

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Jorge Morgado

Instituto Superior Técnico

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