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Transition metal dihydrogen complexes: isotope effects on reactivity and structure
Author(s) -
Heinekey D. Michael
Publication year - 2007
Publication title -
journal of labelled compounds and radiopharmaceuticals
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.432
H-Index - 47
eISSN - 1099-1344
pISSN - 0362-4803
DOI - 10.1002/jlcr.1385
Subject(s) - chemistry , hydride , dihydrogen complex , reactivity (psychology) , kinetic isotope effect , molecule , transition metal , ligand (biochemistry) , deuterium , coordination complex , nuclear magnetic resonance spectroscopy , crystallography , computational chemistry , quantum chemistry , hydrogen bond , metal , inorganic chemistry , stereochemistry , organic chemistry , catalysis , medicine , biochemistry , physics , alternative medicine , receptor , supramolecular chemistry , pathology , quantum mechanics
Complexation of dihydrogen to transition metal centers was discovered by Kubas and coworkers in 1984. The notion that the simplest molecule in chemistry can act as a ligand to form relatively stable transition metal complexes has led to a paradigm shift in coordination chemistry. Crucial to the exploration of this intriguing new chemistry has been the use of isotope substitution. Several aspects of the coordination chemistry of dihydrogen have revealed fascinating isotope effects on reactivity, spectroscopy and in some cases structure. Complexation of HD has been used to diagnose bond distances from measurements of J HD and isotope effects for D 2 versus H 2 binding have been evaluated. Examples of quantum mechanical exchange coupling in H 2 complexes have been described. These effects disappear when one of the H atoms is replaced by D. In molecules with bound hydrogen adjacent to a hydride ligand, non‐statistical occupancy of hydrogen versus hydride sites by deuterons has been observed. In some cases, isotope‐dependent structures have been established by the study of HD, HT and DT complexes using NMR spectroscopy. Copyright © 2007 John Wiley & Sons, Ltd.