作者:Juan J. Vaquero、Domingo García-Cuadrado、Ana M. Cuadro、Julio Alvarez-Builla
DOI:10.1055/s-2002-34903
日期:——
A novel unit based on pyridiniumcations has been synthesized by the Stille reaction and represents a model for development of molecular electronic devices.
作者:Marco Antonio Ramirez、Raul Custodio、Ana M. Cuadro、Julio Alvarez-Builla、Koen Clays、Inge Asselberghs、Francisco Mendicuti、Obis Castaño、José L. Andrés、Juan J. Vaquero
DOI:10.1039/c3ob41159a
日期:——
were prepared by reaction of alkylazinium salts with N-heteroarylstannanes under Stille conditions. This approach provides easy access to potential single donor D–A+ chromophores in which the acceptor moiety A+ is the pyridinium cation and the donors are different π-excessive N-heterocycles. The β hyperpolarizabilities were measured in hyper-Rayleighscattering experiments and the experimental data are
Heteroaromatic Cation-Based Chromophores: Synthesis and Nonlinear Optical Properties of Alkynylazinium Salts
作者:Tatiana Cañeque、Ana M. Cuadro、Julio Alvarez-Builla、Javier Pérez-Moreno、Koen Clays、Gema Marcelo、Francisco Mendicuti、Obis Castaño、José L. Andrés、Juan J. Vaquero
DOI:10.1002/ejoc.201000816
日期:2010.11
A variety of alkynylazinium cationic (D-π-A + ) chromophores were prepared in good yields by the reaction of bromoazinium (pyridinium, quinolinium, and isoquinolinium iodides) with alkynes under Sonogashira conditions. The analysis of the experimentally recorded spectra is supported by quantum chemical calculations using restricted configuration interaction and density functional methods. First-order
Donor-(π-bridge)-azinium as D-π-A+ one-dimensional and D-π-A+-π-D multidimensional V-shaped chromophores
作者:Marco Antonio Ramírez、Ana M. Cuadro、Julio Alvarez-Builla、Obis Castaño、Jose L. Andrés、Francisco Mendicuti、Koen Clays、Inge Asselberghs、Juan J. Vaquero
DOI:10.1039/c2ob06427h
日期:——
Heteroaromatic cations reacted with N-heteroarylacetylenes under Sonogashira conditions to allow easy access to potential single donor D-π-A+ and V-shapedD-π-A+-π-Dchromophores, where the acceptor moiety A is the π-deficient pyridinium cation and the donor moiety is represented by different π-excessive N-heterocycles. The β hyperpolarizabilities were measured using hyper-Rayleigh scattering experiments
Excellent correlation between substituent constants and pyridinium N-methyl chemical shifts
作者:Sha Huang、Jesse C.S. Wong、Adam K.C. Leung、Yee Man Chan、Lili Wong、Myrien R. Fernendez、Amanda K. Miller、Weiming Wu
DOI:10.1016/j.tetlet.2009.06.081
日期:2009.9
Substituents on the pyridinium ring of N-methylpyridinium derivatives, especially those on the 2- or 4-position, have a large effect on the 1H and 13C NMR chemical shifts of the N-methyl group. Reasonable correlations between the chemical shift changes and the resonance substituentconstants are observed. The dual substituent parameter approach provides an excellent correlation when a combination of