Publicado

2018-01-01

Synthesis, characterization, X-ray crystal structure and DFT calculations of 4-([2,2':6',2''-terpyridin]- 4'-yl)phenol

Síntesis, caracterización, estructura cristalina y cálculos DFT para el 4-([2,2':6',2''-terpiridin]-4'-il)fenol

Síntese, caracterização, estrutura de cristal e cálculos DFT para o 4-([2,2':6',2''-terpiridina]-4'-il)fenol

DOI:

https://doi.org/10.15446/rev.colomb.quim.v47n1.66281

Palabras clave:

Terpyridine, Krönhke reaction, Crystal structure, TD-DFT (en)
Terpiuridina, reacción de Krönhke, estructura cristalina, TD-DFT (es)
Terpiridine, reação de Krönhke, estrutura de cristal, TD-DFT (pt)

Autores/as

  • Cesar Sierra UNAL- BOgotá
  • Brian Castro Agudelo Universidad de la Amazonia
  • Cristian Ochoa-Puentes Universidad Nacional de Colombia
  • William Rodriguez-Cordoba Universidad Nacional de Colombia
  • Andreas Reiber Universidad de los Andes

The synthesis of new terpyridine (Tpy) derivatives has been subject of extensive research due to its potential as functional materials for solar energy conversion, among other applications. In this
contribution, the 4-([2,2':6',2''-terpyridin]-4'-yl)phenol (TpyOH) has been synthesized, characterized and studied through several methods, including X-ray crystallography and computational approaches. Single crystal X-ray structure analysis shows that TpyOH is essentially planar, with dihedral angles of about 5.03° between the central pyridinyl and the phenolic ring, and also 6.05 and 12.2° in the terpyridine moiety. In the crystal, molecules are
linked by intermolecular hydrogen bonds and through π-π stacking interactions. Using a time-dependent density functional theory approach and taking into account bulk solvent effects, the absorption and fluorescence spectra of TpyOH were investigated and compared. The TD-DFT S0→Sn and S1→S0 transition energies are in good agreement with experimental results. The frontier molecular orbitals analysis showed that the low-energy absorption band has an
intraligand charge transfer character (ICT), while the high-energy band is a common feature of π-π* transitions of the Tpy moiety. The S1→S0 emission transition also has an ICT character, with a 90% contribution from the HOMO→LUMO transitions.

La síntesis de derivados terpiridinicos (Tpy) se ha investigado ampliamente debido a su potencial para la conversión de  energía solar. En este artículo se sintetizó  y caracterizó el 4-([2,2':6',2'' terpiridin]-4'-il)fenol (TpyOH), a través de varias metodologías como la cristalografía de rayos X y herramientas computacionales. El análisis de rayos X de monocristal mostró que el TpyOH es plano, con ángulos diedros de 5,03° entre el piridinilo central y el anillo fenólico, con presencia de ángulos de 6,05 y 12,2º en la porción terpiridínica. En el cristal, las moléculas están unidas por  enlaces  de  hidrógeno intermoleculares  y  mediante  interacciones  de apilamiento  π-π. Utilizando cálculos DFT dependientes del tiempo (TD-DFT) y teniendo en cuenta el efecto de los  disolventes, se investigaron y  compararon los  espectros  de absorción  y fluorescencia  de TpyOH. Las energías de transición TD-DFT de S0→Sn y S1→S0 concuerdan con los resultados experimentales. El análisis de orbitales moleculares de frontera mostró que la banda de absorción de baja energía corresponde a transferencia de carga intraligando (ICT); mientras que la banda de alta energía es común en las transiciones π-π* del resto Tpy. La emisión debido a la transición S1→S0 corresponde  a  ICT,  con  una  contribución  del 90%  proveniente  de  transiciones HOMO→LUMO.
A síntese de derivados de terpiridina (Tpy) tem sido estudada devido ao seu potencial para a conversão de energia solar. Nesta contribuição, o 4-([2,2':6',2''- terpiridina]-4'-il) fenol (TpyOH) foi sintetizado, caracterizado e estudado por vários métodos. A análise de estrutura de raios X de cristal único mostra que o TpyOH é plano, com ângulos diedros de 5,03 ° entre o piridinilo central e o anel fenólico, e também 6,05 e 12,2 ° na porção de terpiridina. No cristal, as moléculas são ligadas por ligações intermoleculares de hidrogênio e através de interações de empilhamento π-π. Usando uma abordagem da teoria funcional da densidade dependente do tempo e levando em consideração os efeitos do solvente em massa, foram investigados e comparados os espectros de absorção e fluorescência do TpyOH. As energias de transição TD-DFT S0→Sn e S1→S0 estão de acordo com os resultados experimentais. A análise de orbitários moleculares de fronteira mostrou que a banda de absorção de baixa energia possui um caráter de transferência de carga intraligando (TIC), enquanto a banda de alta energia é uma característica comum das transições π-π* da fração Tpy. A transição de emissão S1→S0 também tem um caráter TIC, com uma contribuição de 90% das transições HOMO→LUMO.

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[1]
“Síntesis, caracterización, estructura cristalina y cálculos DFT para el 4-([2,2’:6’,2’’-terpiridin]-4’-il)fenol”, Rev. Colomb. Quim., vol. 47, no. 1, pp. 77–85, Jan. 2018, doi: 10.15446/rev.colomb.quim.v47n1.66281.