1202253-60-8Relevant academic research and scientific papers
Near-infrared emitting ytterbium metal-organic frameworks with tunable excitation properties
White, Kiley A.,Chengelis, Demetra A.,Zeller, Matthias,Geib, Steven J.,Szakos, Jessica,Petoud, Stephane,Rosi, Nathaniel L.
, p. 4506 - 4508 (2009)
The design of metal-organic frameworks (MOFs) incorporating near-infrared emitting ytterbium cations and organic sensitizers allows for the preparation of new materials with tunable and enhanced photophysical properties. The Royal Society of Chemistry 2009.
Nature of Color Diversity in Phenylenevinylene-Based Polymorphs
Cárdenas, Juan C.,Aguirre-Diáz, Lina M.,Galindo, Johan F.,Alí-Torres, Jorge,Ochoa-Puentes, Cristian,Echeverri, Marcelo,Gómez-Lor, Berta,Monge, M. ángeles,Gutiérrez-Puebla, Enrique,Sierra, Cesar A.
, p. 3913 - 3922 (2019/07/04)
In this work we present a joint experimental and theoretical study of the light emitting properties of (E,E)-2,5-dimethoxy-1,4-bis[2-(4-carboxylatestyryl)]benzene, a phenylenevinylene (PV, from now on) derivative in the solid state. Careful crystal growth under different conditions of this PV luminophore yields three different crystals with dissimilar color emissions with maxima ranging between 504 and 565 nm. Single crystal structure elucidations indicate that they correspond to a DMF solvate, denoted 2·DMF (yellow) and two conformational polymorphs named 2α (yellow) and 2β (orange). Analysis of the close contacts and the framework topologies help us to rationalize the different colors observed, not only on the basis of different intramolecular conformations but also of the different intermolecular interactions observed. Particularly, the presence of different C-H···πand ?···πinteractions in 2α and in 2β polymorphs, respectively, give rise to different supramolecular frameworks with hex and bcu topologies. Theoretical studies reinforce the hypothesis that cooperative ?···πinteractions in the crystal lattice are responsible for the red-shifted color observed in the polymorph 2β. In fact, in contrast to what is observed with the polymorph 2α, as we incorporate more monomers in the calculations of the optical properties of polymorph 2β, the estimated energy for the vertical excitation from the ground state to the first excited state moves to lower values.
