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A structurally-characterized NbCl5-NHC adduct.

Marco Bortoluzzi¹, Eleonora Ferretti, Fabio Marchetti

¹Ca' Foscari University of Venice, Dipartimento di Scienze Molecolari e Nanosistemi, Dorsoduro 2137, I-30123 Venezia, Italy.

Chemical Communications (Cambridge, England)

|March 25, 2014

Summary

This summary is machine-generated.

Niobium pentachloride selectively reacted with bulky N-heterocyclic carbene (NHC) ligands to form novel complexes. These complexes exhibit the highest oxidation state for a metal center in transition metal halide-NHC adducts, with an unusually long niobium-carbon bond.

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Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

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Published on: April 19, 2019

Area of Science:

Organometallic Chemistry
Inorganic Chemistry
Materials Science

Background:

N-heterocyclic carbenes (NHCs) are versatile ligands in organometallic chemistry.
Niobium halide complexes are important in catalysis and materials science.
Previous studies have explored transition metal halide-NHC adducts, but high oxidation states are less common.

Purpose of the Study:

To synthesize and characterize novel niobium pentachloride complexes with bulky NHC ligands.
To investigate the coordination chemistry of niobium in a high oxidation state.
To determine the structural features of these unique adducts.

Main Methods:

Selective reaction of niobium pentachloride (NbCl5) with two different bulky NHC ligands.
Characterization of the resulting complexes using spectroscopic techniques.
X-ray crystallography to determine the molecular structure of a representative complex.

Main Results:

Successful synthesis of NbCl5(NHC) complexes, featuring niobium in the +5 oxidation state.
The highest oxidation state reported for a metal center in a transition metal halide-NHC adduct.
The X-ray structure revealed a monodentate NHC-niobium species with an exceptionally long Nb-C bond.

Conclusions:

The study demonstrates the feasibility of forming stable niobium(V)-NHC complexes.
These findings expand the scope of known transition metal halide-NHC chemistry.
The observed long Nb-C bond suggests unique electronic or steric interactions within the complex.