Luminescent imidazolium–naphthalene salts in liquid and solid states

Abstract

This article describes highly luminescent ionic compounds in liquid and crystalline states, where a naphthalene moiety is conjugated to an imidazolium center decorated with two different lengths of alkyl chains.

The photophysical properties of naphthalene bridged disilanes

“…22,25 Similarly, L'Her et al observed broad peaks in the visible regions for imidazolium-naphthalene salts in DCM. 23 However, to the best of our knowledge, this is the rst example where excimers are observed through intermolecular interactions between naphthalene in bridged disilane compounds. It is also important to note that this phenomenon was not observed in the disilyl naphthalene precursors, prior to the formation of the Si-Si bond.…”

“…Several literature examples of excimer formation in molecules containing a naphthalene moiety have been reported. [22][23][24][25] Pandeeswer et al and Boer et al observed broad peaks in the visible regions for naphthalene diimides in polar as well as nonpolar solvents. 22,25 Similarly, L'Her et al observed broad peaks in the visible regions for imidazolium-naphthalene salts in DCM.…”

Dipyrrolyldiketonato Titanium(IV) Complexes from Monomeric to Multinuclear Architectures: Synthesis, Stability, and Liquid-Crystal Properties

“…It is worth noting that the self-assembly into strings of complexes survived the vanishing of the columnar long-range structure, as indicated by the persistence in the isotropic liquid of a localrange periodicity D reminiscent of the first-order reflection and correlated over about three neighboring molecules. Such localrange structuration in the liquid state, already reported for columnar architectures 65 and commonly observed in ionic liquids, 66,67 is a sign of the strong cohesion of the selfassembly.…”

A Magnetocaloric Glass from an Ionic‐Liquid Gadolinium Complex

“…Specifically, the contact peak (CP) with maximum around 4.5 Å corresponds to lateral distances between various ligand segments in liquid state whereas the charge‐ordering peak (COP) with maximum around 7.5 Å results from the arrangement of imidazolium and bistriflimide ions [13] . The packing of entire molecules forms a structure correlated to local range, evidenced by the presence of a strong small‐angle peak (D) [14] . Peak location and width give the characteristic periodicity and correlation length of the structure ( D =16.6 Å, ξ ≈45 Å, calculated from the Scherrer formula with shape factor K =0.9).…”

“…[13] The packing of entire molecules forms a structure correlated to local range, evidenced by the presence of a strong small-angle peak (D). [14] Peak location and width give the characteristic periodicity and correlation length of the structure (D = 16.6 Å, ξ � 45 Å, calculated from the Scherrer formula with shape factor K = 0.9).…”