Novel linear hexanuclear cobalt string complexes (Co6 12+) and one-electron reduction products (Co6 11+) supported by four bpyany2- ligands
Journal
Dalton Transactions
Journal Issue
17
Pages
2106-2113
Date Issued
2006
Author(s)
Abstract
The new ligand, 2,7-bis(α-pyridylamino)-1,8-naphthyridine (H 2bpyany), was synthesized by the reaction of 2,7-dichloro-1,8- naphthyridine with 2-aminopyridine in the presence of t-BuOK under palladium(0)-catalyzed conditions. The preparation and characterization of novel hexacobalt string complexes, [Co6(6-bpyany) 4(NCS)2](PF6)n (n = 1 (1); n = 2 (2)) and [Co6(6-bpyany)4(OTf) 2](OTf)n (n = 2 (3); n = 1 (4)) are presented. The crystal structures for compounds 1-4 have been determined by X-ray crystallography. Compounds 1 and 4 have the Co611+ configurations and are air-stable. Compounds 2 and 3 with Co612+ configurations are structurally similar to 1 and 4, respectively. The electrochemistry of 1 displays four redox couples at E1/2 = -0.55, +0.38, +0.91, and +1.18 V (vs. Ag/AgCl). The magnetic data show that compounds 1 and 4 are in a spin state of S = 1/2, and 2 and 3 in a spin state of S = 1. The results of the EHMO calculations on compounds 1 and 2 are in agreement with their magnetic measurements. © The Royal Society of Chemistry 2006.
SDGs
Other Subjects
Complexation; Crystal structure; Electrochemistry; Electrons; Molecular structure; Palladium; Reaction kinetics; X ray crystallography; 2,7-dichloro-1,8- naphthyridine; 2-aminopyridine; Ligand; Magnetic data; One-electron reduction products; Cobalt
Type
journal article