Analysis of Solid‐State Luminescence Emission Amplification at Substituted Anthracenes by Host–Guest Complex Formation

Abstract

Small robust organic molecules showing solidstate luminescence are promising candidates foro ptoelectronic materials. Herein, we investigate as eries of diphenylphosphanyl anthracenes [9-PPh 2-10-R-(C 14 H 8)] and their sulfur oxidised analogues.T he oxidation causes drastic changes in the molecular structurea st he new orientation of the bulky (S)PPh 2 substituent inducesastrongb utterfly bent structure of the anthracenec ore, which triggersastrong bathochromic shift resulting in ag reen solid-state fluorescence. As the emission properties changeo nly slightly upon aggregation the origin of the emission is attributed to at ypical monomer fluorescence. The host-guest complexes of [9-(S)PPh 2-10-Ethyl-(C 14 H 8)] with four basic arenes reveal an emissione nhancement up to five-times higherq uantum yields comparedt ot he pure host. Less interchromophoric interactions and ar estriction of intramolecular motion within the hostm olecules due to fixation by weak CÀH•••p interactions with the co-crystallised arene are responsible for that emission enhancement.

Enhancing Steric Hindrance via Ligand Design in Dysprosium Complexes: From Induced Slow Relaxation to Zero-Field Single-Molecule Magnet Properties

“…There is, however, no clear orientation of the aromatic rings for any parallel overlap that would suggest the presence of significant dipole−dipole interactions. 60,61 Magnetic Properties. We initially measured the temperature-dependency of the product of magnetic susceptibility and the temperature χ M T which showed high-temperature values of 14.21 for 1, 14.15 for 2, and 14.41 cm 3 mol −1 K for 3, as displayed in Figure 2.…”

“…Weak π interactions may still be present in 1 and 2 , due to the relative proximity of the phenyl groups of two neighboring complex molecules (see Table ). There is, however, no clear orientation of the aromatic rings for any parallel overlap that would suggest the presence of significant dipole–dipole interactions. , …”

Facile ACQ-to-AIE transformation via diphenylphosphine (DPP) modification with versatile properties

“…The emission wavelength can be tuned by controlling the D-A strength with different substituent groups. Although a few examples of solid-state luminescence by DPP modification have been mentioned in the literature, [46][47][48][49] a systematic study of a general strategy to realize ACQ-to-AIE transformation by DPP-modification still needs to be explored. Furthermore, the AIEgens show novel pressure-induced emission enhancement (PIEE) characteristics by using the diamond anvil cell (DAC) technique.…”

2,2′-Bipyridine derived doubly B ← N fused bisphosphine-chalcogenides, [C5H3N(BF2){NCH2P(E)Ph2}]2 (E = O, S, Se): tuning of structural features and photophysical studies

“…53 It is well understood that the optoelectronic properties of carbon-based π-conjugated frameworks can be enhanced through the implementation of other main-group elements, such as nitrogen, boron, oxygen, phosphorus or sulfur. [53][54][55][56] The HOMO/ LUMO energy gap of many boron or phosphorus containing aromatic π-conjugated compounds resides in the ideal range to produce effective emission in the visible region and hence they are potential candidates in organic electronics.…”