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L-Tryptophan 4-nitrophenol trisolvate
Rodrigues, Vitor; Costa, Margarida; Belsley, M.; Gomes, E. MatosThe title compound, C11H12N2O2 3C6H5NO3, comprises a zwitterionic amino acid formed by two nearly planar groups: (i) the indole ring and C , and (ii) the carboxyl group, C , as well as the amine N atom, with r.m.s. deviations of 0.0084 and 0.0038 A ˚ , respectively. The angle between these idealized planes is 39.47 (9) . The amine group of the amino acid is in a syn ( sc) arrangement relative to the ring system...
Synthesis, structure and non-linear optical properties of L-argininium perrhena...
Isakov, D. V.; Gomes, E. Matos; Belsley, M.; Rodrigues, Vitor; Costa, MargaridaA new hybrid organic–inorganic non-linear optical crystalline material, L-argininium perrhenate has been synthesized. The crystal belongs to P212121 space group, has a good optical quality and high transmission in the visible and near infra-red spectral regions. L-argininium perrhenate has high birefringence and is more than four times as efficient as KDP in second harmonic generation, making it a potentially a...
Molybdenum complexes bearing thiophenic or- arylthiophenic groups : synthesis, ...
Fonseca, A. Maurício C.; Belsley, M.; Gomes, E. Matos; Castro, M. Cidália R.; Raposo, M. Manuela M.A series of complexes trans-[FMo(N=NCHL)(dppe)2][BF4] (L = (bi)thienyl or arylthienyl), were synthesized and fully characterized by 1H, 13C, 31P NMR, IR and UV–Vis spectroscopies. The electronic spectra and electrochemical behavior of the complexes were investigated. The electronic absorption spectra of these complexes display a broad low-energy band in the visible region attributable to metal-to ligand charge ...
5-Arylazo-2,2´-bithiophenes : a novel promising series of NLO chromophores
Raposo, M. Manuela M.; Ferreira, Ana M. P. F.; Belsley, M.; Gomes, E. Matos; Moura, João C. V. P.The synthesis of 5-arylazo- substituted bithiophenes and their UV-visible, solvatochromic and nonlinear optical properties (NLO) are described. In agreement with the solvatochromic data and also with the second-order molecular NLO characterization, the new donor-acceptor systems could find application as suitable solvatochromic probes and also as new NLO materials.
New oligothienyl-imidazo-phenanthroline chromophores for NLO applications
Batista, Rosa M. F.; Costa, Susana P. G.; Lodeiro, Carlos; Belsley, M.; Gomes, E. Matos; Raposo, M. Manuela M.A new series of oligothienyl-imidazo-phenanthrolines 3 were synthesised in good to excellent yields by condensation of 5,6-phenantroline-dione 2 with formyl-thiophene derivatives 1 in the presence of ammonium acetate in glacial acetic acid. Furthermore, their solvatochromism and molecular optical nonlinearities were determined and comparatively studied. The experimental results indicate that phenanthrolines 3, ...
Synthesis of tricyanovinyl-substituted thienylpyrroles and characterization of ...
Raposo, M. Manuela M.; Sousa, Ana M. R. C.; Kirsch, G.; Ferreira, F.; Belsley, M.; Gomes, E. Matos; Fonseca, A. Maurício C.Tricyanovinyl-substituted 1-(alkyl)aryl-2-(2´-thienyl)pyrroles 1 have been synthesized by direct tricyanovinylation reaction of 1-(alkyl)aryl-2-(2´-thienyl)pyrroles 2 using TCNE. The tricyanovinyl- derivatives 1 display dramatic reductions in both their optical and electrochemical band gaps relative to thienylpyrrole precursors 2. The solvatochromic behavior of compounds 1 was investigated in a variety of sol...
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