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Direct synthesis of ligand-based radicals by the addition of bipyridine to chromium(II) compounds.

Inorganic chemistry (2013-02-20)
Wen Zhou, Addison N Desnoyer, James A Bailey, Brian O Patrick, Kevin M Smith
ABSTRACT

The reaction of 2,2'-bipyridine (bpy) with monomeric chromium(II) precursors was used to prepare the S = 1 complexes Cr(tBu-acac)2(bpy) (1) and (η(5)-Cp)(η(1)-Cp)Cr(bpy) (3), as well as the S = 2 compound Cr[N(SiMe3)2]2(bpy) (4). The crystallographically determined bond lengths indicate that the bpy ligands in 1 and 3 are best regarded as radical anions, while 4 shows no structural evidence for electron transfer from Cr(II) to the neutral bpy ligand.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Pyridine, anhydrous, 99.8%
Sigma-Aldrich
Pyridine, ACS reagent, ≥99.0%
Sigma-Aldrich
Pyridine, suitable for HPLC, ≥99.9%
Sigma-Aldrich
Pyridine, ReagentPlus®, ≥99%
Sigma-Aldrich
Pyridine hydrochloride, 98%
Sigma-Aldrich
Pyridine, puriss. p.a., ACS reagent, reag. Ph. Eur., ≥99.5% (GC)
Sigma-Aldrich
Pyridine, ≥99%
Supelco
Pyridine, analytical standard
Sigma-Aldrich
Pyridine hydrobromide, 98%
Sigma-Aldrich
Pyridine, biotech. grade, ≥99.9%
Sigma-Aldrich
Pyridine hydrochloride, purum, ≥98.0% (AT)
Supelco
Pyridine solution, certified reference material, 2000 μg/mL in methanol
Sigma-Aldrich
Pyridine, ReagentPlus®, ≥99%
Sigma-Aldrich
Pyridine, ACS reagent, ≥99.0%