Dynamic NMR as a Nondestructive Method for Determination of Rates of Dissociation. XV. Dissociation of Thioether and Ether Ligands in Tin(IV) and Boron Complexes and Significance of Entropy of Activation Therein
作者:Michinori Oki、Yasuhisa Yamada
DOI:10.1246/bcsj.61.1191
日期:1988.4
The rates of dissociation of thioether ligands which are imbedded in organotin(IV) compounds, such as trichloro[o-(ethylthiomethyl)phenyl]stannane, were determined by the dynamic NMR method. The dynamic processes of the corresponding ether ligands was too fast to detect as the change in line shapes in 1H NMR spectra. All the boron compounds examined, which possessed similar structures to the stannane and were of the boronate type, failed to show dissociation of a thioether or ether ligand due to their large rates of dissociation. The rates of dissociation of a thioether–tribromoboron complex were determined by the same technique. The feature of the activation parameters was that the compounds examined exhibited fairly large positive entropy of activation in accordance with other results that involve dissociation of ionic species into covalent species.
X-ray Structures, Photophysical Characterization, and Computational Analysis of Geometrically Constrained Copper(I)−Phenanthroline Complexes
作者:John Cody、Jeanette Dennisson、Joshua Gilmore、Donald G. VanDerveer、Maged M. Henary、Alan Gabrielli、C. David Sherrill、Yiyun Zhang、Chia-Pin Pan、Clemens Burda、Christoph J. Fahrni
DOI:10.1021/ic034529j
日期:2003.8.1
originate predominantly from the copper d(xz) orbital. The computational analysis identifies an excited-state manifold with a number of close-lying, potentially emissive triplet states and is in agreement with the multiexponential decay kinetics of the MLCT luminescence. The relationship between structural and photophysical data of the studied Cu(I) mono-phenanthroline complexes agrees well with current models