scholarly journals When two are better than one: bright phosphorescence from non-stereogenic dinuclear iridium(iii) complexes

2016 ◽  
Vol 45 (16) ◽  
pp. 6949-6962 ◽  
Author(s):  
Ruth E. Daniels ◽  
Stacey Culham ◽  
Michael Hunter ◽  
Marcus C. Durrant ◽  
Michael R. Probert ◽  
...  
Keyword(s):  
Rate Constants ◽  
Iridium Complexes ◽  
Bridging Ligands ◽  
Radiative Rate ◽  
Better Than

Tridentate N^C^N-coordinating ligands in combination with bis-N^C-bridging ligands give rise to achiral dinuclear iridium complexes displaying exceptionally high radiative rate constants.

Oxidative Addition Reactions to Novel Heterotrinuclear Iridium Complexes with Mixed Bridging Ligands. Crystal Structure of [{Ir(.mu.-pz)(.mu.-StBu)I2(CO)[P(OMe)3]}2Pd]

1995 ◽  
Vol 34 (1) ◽  
pp. 111-115 ◽  
Author(s):  
M. Teresa Pinillos ◽  
Anabel Elduque ◽  
Eduardo Martin ◽  
Nuria Navarro ◽  
Fernando J. Lahoz ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Oxidative Addition ◽  
Addition Reactions ◽  
Iridium Complexes ◽  
Bridging Ligands

scholarly journals Improved Deep-Red Phosphorescence in Cyclometalated Iridium Complexes via Ancillary Ligand Modification

2019 ◽  
Author(s):  
Evanta Kabir ◽  
Steven Sittel ◽  
Boi-Lien Nguyen ◽  
Thomas Teets
Keyword(s):  
Rate Constant ◽  
Quantum Yields ◽  
Iridium Complexes ◽  
Ancillary Ligand ◽  
Ancillary Ligands ◽  
X Ray ◽  
X Ray Crystallography ◽  
Ligand Modification ◽  
Radiative Rate ◽  
Red Luminescence

In this work, we describe bis-cyclometalated iridium complexes with efficient deep-red luminescence. Two different cyclometalating (C^N) ligands‒1-phenylisoquinoline (piq) and 2-(2- pyridyl)benzothiophene (btp)‒are used with six strong π-donating ancillary ligands (L^X) to furnish a suite of 10 new complexes with the general formula Ir(C^N)2(L^X). Improvements in deep-red photoluminescence quantum yields were accomplished by the incorporation of sterically encumbering substituents onto the ancillary ligand, which can enhance the radiative rate constant (kr) and/or reduce the non-radiative rate constant (knr). Five of the complexes were characterized by X-ray crystallography, and all of them were investigated by in-depth spectroscopic and electrochemical measurements.<br>

scholarly journals Mono and dinuclear iridium(iii) complexes featuring bis-tridentate coordination and Schiff-base bridging ligands: the beneficial effect of a second metal ion on luminescence

2020 ◽  
Vol 49 (30) ◽  
pp. 10463-10476
Author(s):  
Emma V. Puttock ◽  
Amit Sil ◽  
Dmitry S. Yufit ◽  
J. A. Gareth Williams
Keyword(s):  
Schiff Base ◽  
Beneficial Effect ◽  
Metal Ion ◽  
Iridium Complexes ◽  
Bridging Ligands

Ditopic bis-N^N^O-coordinating ligands, prepared by Schiff base chemistry, lead to dinuclear iridium complexes that emit much more brightly than their mononuclear counterparts.

scholarly journals Photophysical properties of the triangular [Au(HNCOH)]3 complex and its dimer

2020 ◽  
Vol 22 (18) ◽  
pp. 10314-10321 ◽  
Author(s):  
Jonas Greiner ◽  
Rashid R. Valiev ◽  
Dage Sundholm
Keyword(s):  
Rate Constants ◽  
Photophysical Properties ◽  
Radiative Rate

Radiative and non-radiative rate constants have been calculated for cyclic trinuclear gold(i) complexes within the Herzberg–Teller approximation.

Phosphorescence of chloropentafluoroacetone at 77 °K

1970 ◽  
Vol 48 (18) ◽  
pp. 2937-2939 ◽  
Author(s):  
H. S. Samant ◽  
A. J. Yarwood
Keyword(s):  
Triplet State ◽  
Chlorine Atom ◽  
Rate Constants ◽  
Aliphatic Ketone ◽  
Radiative Rate

The phosphorescence of chloropentafluoroacetone at 77 °K is reported and the energy of the triplet state is estimated to be 74 kcal. The phosphorescence lifetimes and the relative phosphorescence yields of chloropentafluoroacetone and hexafluoroacetone at 77 °K were measured. The results show that substitution of a chlorine atom in the fluorinated aliphatic ketone changes the radiative and non-radiative rate constants from the triplet state at 77 °K by factors of about 1.7 and 2.3, respectively.

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