Coordination Compounds of Indium. Part XXVI. Ligand Exchange Studies with Trifluoromethyl-β-diketonato(dimethyl)indium(III) compounds

1974 ◽  
Vol 52 (23) ◽  
pp. 3944-3949 ◽  
Author(s):  
H. L. Chung ◽  
D. G. Tuck
Keyword(s):  
Double Bond ◽  
Proton Transfer ◽  
Ligand Exchange ◽  
Coordination Compounds ◽  
Intramolecular Proton Transfer ◽  
Free Energies ◽  
Monodentate Ligand ◽  
First Order ◽  
Coalescence Temperature

The ligand exchange between Me2InL and HL (L = CF3.CO.CH.CO.R− anion; R = methyl or t-butyl) has been studied by 19F n.m.r. spectroscopy, using benzene and di-isobutylketone as solvents. The exchange is first order in both Me2InL and HL. Activation free energies were derived from measurements of the coalescence temperature. The results are compared with those of earlier studies. The rate-controlling process in the exchange is identified as the rotation of one monodentate diketonate ligand about a partial double bond prior to intramolecular proton transfer to a second monodentate ligand.

Coordination Compounds of Indium. Part XIX. Ligand Exchange Studies with Indium(III) Complexes of Trifluoromethyl-β-diketonates

1972 ◽  
Vol 50 (24) ◽  
pp. 3950-3957 ◽  
Author(s):  
Mrs. G. M. Tanner ◽  
D. G. Tuck ◽  
E. J. Wells
Keyword(s):  
Ligand Exchange ◽  
Coordination Compounds ◽  
Free Ligand ◽  
Intramolecular Proton Transfer ◽  
Zero Order ◽  
Monodentate Ligand ◽  
Ligand Exchange Reaction ◽  
First Order ◽  
Stereochemical Properties ◽  
Coalescence Temperature

The ligand exchange reaction between InL3 con plexes (L = CF3•CO•CH•CO•R− anion; R = methyl, i-butyl, phenyl, 2-naphthyl, and 2-thienyl) and excess free ligand (HL) has been studied in the solvents diisopropyl ketone, acetonitrile, benzene, and dimethylsulfoxide. Studies of the lifetimes of the reactants as obtained from their 19F n.m.r. line-widths show that the exchange is first order in InL3 concentration, but zero order in free ligand concentration. The coalescence temperature for the collapse of the n.m.r. 19F chemical shift between free and complexed ligand (~50 Hz) yields ΔG≠ for the exchange. The results are in agreement with the known stereochemical properties of indium(III) complexes. The rate-controlling process in the exchange is identified as the. rotation of one monodentate ligand about a partial double bond prior to intramolecular proton transfer to a second monodentate ligand.

scholarly journals An enhanced sampling QM/AMOEBA approach: The case of the excited state intramolecular proton transfer in solvated 3-hydroxyflavone

2021 ◽  
Vol 154 (18) ◽  
pp. 184107
Author(s):  
Michele Nottoli ◽  
Mattia Bondanza ◽  
Filippo Lipparini ◽  
Benedetta Mennucci
Keyword(s):  
Excited State ◽  
Proton Transfer ◽  
Intramolecular Proton Transfer ◽  
Enhanced Sampling

scholarly journals The development of aryl-substituted 2-phenylimidazo[1,2-a]pyridines (PIP) with various colors of excited-state intramolecular proton transfer (ESIPT) luminescence in the solid state

2016 ◽  
Vol 4 (16) ◽  
pp. 3599-3606 ◽  
Author(s):  
Toshiki Mutai ◽  
Tatsuya Ohkawa ◽  
Hideaki Shono ◽  
Koji Araki
Keyword(s):  
Excited State ◽  
Solid State ◽  
Proton Transfer ◽  
Intramolecular Proton Transfer ◽  
Aryl Group ◽  
Red Emission ◽  
Wide Range

The color of ESIPT luminescence of HPIP is tuned in a wide range by the introduction of aryl group(s), and thus a series of PIPs showing blue to red emission is realized.

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