Recent development of the transition metal complexes showing strong absorption of visible light and long-lived triplet excited state: From molecular structure design to photophysical properties and applications

https://hub.hku.hk/bitstream/10722/282893/1/Content.pdf

Controlled Synthesis of PdII and PtII Supramolecular Copolymer with Sequential Multiblock and Amplified Phosphorescence

A novel metal–organic framework (MOF) with long persistent luminescence (LPL) for multilevel oxygen detection is proposed, for which, the phosphorescence intensity, phosphorescence lifetime and LPL performance were applied to detect oxygen levels in 300–100 mbar, 0–150 mbar and <8 mbar, respectively Uniquely, the new idea of LPL detection makes the monitoring of ultra-low oxygen content possible with visualization

A long persistent phosphorescent metal–organic framework for multi-level sensing of oxygen

Circularly polarized luminescence (CPL) derived from supramolecular self-assembly chirality has been a fascinating field of research due to its applications in photoactive devices and bioactive pro...

Enhanced Synchronously Emission Dissymmetry Factor and Quantum Efficiency of Circularly Polarized Phosphorescence from Point-Chiral Cyclometalated Platinum(II) Liquid Crystal

Thermo-responsive light-emitting materials have wide potential applications in temperature sensing, bioimaging, optoelectronic devices and information security, due to their intriguing luminescence property changes in response to temperature. Among them, light-emitting metal complexes and related coordination materials are appealing in possessing enormous structural diversity and excellent luminescence properties. The general thermo-responsive types and the underlying mechanism of these materials and recent progress in the development of thermo-responsive metal complexes and related materials are surveyed in this critical review, including small molecular metal complexes with different electronic configurations (d6, d8, d10, among others), metal clusters, coordination polymers, metal–organic frameworks (MOFs), and multicomponent coordination polymers and assemblies. A particular focus is given on how to build systems showing ratiometric lumunescence changes in response to temperature, including molecular dyads containing two chromophores, heterodimetallic clusters, mixed-metal MOFs, and energy donor–acceptor assemblies. In addition, the applications of these materials in temperature sensing, bioimaging, and information security are briefly discussed. A perspective is given in the Conclusion section to reflect potential guidelines for future research in this field.

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Thermo-responsive light-emitting metal complexes and related materials

Two Pd(II) complexes based on tetradentate chelate ligands with either a 1,2,4-triazolyl (Pd1) or 1,2,3-triazolyl (Pd2) unit were synthesized, and their structure-property relationships were studied. Both Pd1 and Pd2 are rare bright deep blue Pd(II) phosphors with contrasting properties. Pd1 displays stimuli-responsive luminescence in response to UV irradiation, concentration, or temperature change, which is ascribed to the facile switching of monomer to excimer emission. In contrast, a similar stimuli-responsive luminescence was not observed for Pd2. Crystal structures and time-dependent density functional theory computational studies established that the excimer formation of Pd1 is caused by electronically favored intermolecular π-π interactions and less steric protection of the Pd core because of the position of its alkyl chains, compared to Pd2. In solution, the excimer emission of Pd1 shows a much greater sensitivity toward oxygen than the monomer emission with a very large Stern-Volmer constant ( Ksv) that is more than twice that of the monomer emission. Both Pd(II) complexes are found to be outstanding oxygen sensors in ethyl cellulose films with superior sensitivity ( Ksvapp = 0.228-0.346 Torr-1) over their Pt(II) equivalents ( Ksvapp = 0.00674-0.0110 Torr-1), owing to their long phosphorescence decay lifetimes. Furthermore, Pd1 shows an excellent photostability, compared to the Pt(II) analogue, making it one of the best and highly robust oxygen sensors based on cyclometalated metal complexes.

Multiresponsive Tetradentate Phosphorescent Metal Complexes as Highly Sensitive and Robust Luminescent Oxygen Sensors: Pd(II) Versus Pt(II) and 1,2,3-Triazolyl Versus 1,2,4-Triazolyl.

Faraz Hussain

Papers

Multiresponsive Tetradentate Phosphorescent Metal Complexes as Highly Sensitive and Robust Luminescent Oxygen Sensors: Pd(II) Versus Pt(II) and 1,2,3-Triazolyl Versus 1,2,4-Triazolyl.

Impact of bidentate N,C-Chelate ligands on the performance of phosphorescent Pt(II) complexes as oxygen sensors

A Feasible Route to Produce 30 MPa Adhesion Strength of Electrochemically Deposited Hydroxyapatite (HA) on Titanium (Ti6Al4V) Alloy