ISSN:
1572-8870
Keywords:
cyclobutadienecobalt complex
;
π-conjugation
;
metallacycling polymerization
;
redox properties
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract The reaction of CpCo(PPh3)2, in which Cp=η 5-cyclopentadienyl, with a π-conjugated diacetylene, FcC≡C–o-C6H4–C≡CFc, in which Fc=ferrocenyl, was found to give a cyclobutadienecobalt mononuclear complex, {η 4-C4Fc2(o-FcC6H4)2}CoCp (1), the crystal structure of which was determined by X-ray crystallography. In contrast, the reaction of CpCo(PPh3)2 with FcC≡C–p-C6H4–C≡CFc affords a cyclobutadienecobalt polymer, [p-C6H4(η 4-C4Fc2)CoCp] n (2). The monocobalt complex 1 shows reversible 1e− and 3e− redox waves at E 0′=0.116 and 0.350 V vs Ag/Ag+, and the polymer complex 2 shows two chemically reversible redox waves at E 0′=0.143 and 0.219 V for the oxidation of the ferrocenyl moieties in the cyclic voltammogram. Crystal data are as follows: (1, C65H49CoFe4), triclinic, space group P\={1} (No. 2), a=13.547(4), b=16.197(4), c=11.763(4) Å, α=106.79(2), β=97.93(3), γ=97.12(3), V=2410(1) Å3, Z=2.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1016690622920
Permalink
