Experimental and Theoretical Study of a Cadmium Coordination Polymer Based on Aminonicotinate with Second-Timescale Blue/Green Photoluminescent Emission

Abstract

A new cadmium/6-aminonicotinate-based coordination polymer (CP) with an unprecedented multicolored and long-lasting emission is reported. This material shows a blue fluorescence which rapidly turns to green persistent phosphorescence with a lifetime of nearly 1 s. Time-dependent density functional theory calculations revealed that electronic transitions arising from both first excited singlet and triplet states involving ligand-centered and ligand-to-metal charge-transfer mechanisms are responsible for such behavior.

Coordination Polymers with Intriguing Photoluminescence Behavior: The Promising Avenue for Greatest Long‐Lasting Phosphors

“…The mixture of water/methanol solutions containing H6ANI and Cd(NO 3 ) 2 · 4H 2 O lead to white polycrystalline powder of [Cd(µ‐6ANI) 2 ] n (14‐Cd) CP, which was found to be isostructural to the above mentioned [Zn(µ‐6ANI) 2 ] n . When exposed to UV monochromatic beam ( λ ex = 332 nm) at 10 K, 14‐Cd shows a brighter and bathochromically shifted emission compared to 14‐Zn, since the wide band signifying the blue emitted light has the maximum centered at 444 nm (Δ λ = 64 nm regarding λ em = 380 nm for 14‐Zn).…”

“…Extended SBU of 14‐Cd structure showing its PL performance. Reproduced from ref . Copyright 2017 American Chemical Society.…”

Designing Single-Ion Magnets and Phosphorescent Materials with 1-Methylimidazole-5-carboxylate and Transition-Metal Ions

“…Regarding the photoluminescent performance, recent research works have shifted the attention toward CPs containing d 10 metal ions − owing to their capacity to stabilize long-lasting phosphorescence (LLP) or afterglow phenomena in the resulting materials so that they could bring a significant advancement in the field of enhanced organic light-emitting diodes (OLEDs). , This fact is derived from the intrinsic characteristics of these metal ions (namely the absence of potential quenching processes owing to their closed-shell configuration) which, in combination with the appropriate fluorescent organic ligands, promotes the reorganization of the energy levels in the compounds that leads to stronger and brighter emission (via ligand-centered (LCCT) or ligand to metal charge transfers (LMCT)) in comparison to that of a free organic molecule. , …”

(μ2-Adipato-κ4O,O′:O′′,O′′′)bis[aqua(benzene-1,2-diamine-κ2N,N′)chloridocadmium]: crystal structure and Hirshfeld surface analysis

“…both hard and soft donors, and to adopt a range of coordination geometries, a diverse array of structures can be generated. The motivation for studying cadmium(II) compounds in this context, over and above intellectual curiosity, rests primarily with evaluating their photoluminescence properties (Lestari et al, 2014;Xue et al, 2015;Seco et al, 2017).…”