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Theoretical, spectroscopic, and mechanistic studies on transition‐metal dinitrogen complexes: Implications to reactivity and relevance to the nitrogenase problem
Author(s) -
Studt Felix,
Tuczek Felix
Publication year - 2006
Publication title -
journal of computational chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.907
H-Index - 188
eISSN - 1096-987X
pISSN - 0192-8651
DOI - 10.1002/jcc.20413
Subject(s) - chemistry , reactivity (psychology) , electrophile , protonation , transition metal , main group element , computational chemistry , metal , covalent bond , ligand (biochemistry) , bridging (networking) , context (archaeology) , electronic structure , crystallography , catalysis , organic chemistry , ion , medicine , computer network , paleontology , biochemistry , alternative medicine , receptor , pathology , computer science , biology
Abstract Dinitrogen complexes of transition metals exhibit different binding geometries of N 2 (end‐on terminal, end‐on bridging, side‐on bridging, side‐on end‐on bridging), which are investigated by spectroscopy and DFT calculations, analyzing their electronic structure and reactivity. For comparison, a bis(μ‐nitrido) complex, where the NN bond has been split, has been studied as well. Most of these systems are highly covalent, and have strong metal–nitrogen bonds. In the present review, particular emphasis is put on a consideration of the activation of the coordinated dinitrogen ligand, making it susceptible to protonation, reactions with electrophiles or cleavage. In this context, theoretical, structural, and spectroscopic data giving informations on the amount of charge on the N 2 unit are presented. The orbital interactions leading to a charge transfer from the metals to the dinitrogen ligand and the charge distribution within the coordinated N 2 group are analyzed. Correlations between the binding mode and the observed reactivity of N 2 are discussed. © 2006 Wiley Periodicals, Inc. J Comput Chem 27: 1278–1291, 2006