We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Synthesis and Characterization of Tetra(pyridyl)cyclobutadiene Iron Complexes [Cp*Fe(C<sub>4</sub>py<sub>4</sub>)]<sup>-</sup> (py = 3-pyridyl and 4-pyridyl, Cp* = C<sub>5</sub>Me<sub>5</sub>).
- Authors
Wiegel, Anne‐Kathrin; Rad, Babak Rezaei; Herrmann, Dirk; Wolf, Robert
- Abstract
The tetra(pyridyl)cyclobutadiene complexes [K([18{crown-6){Cp*FeC4(3-py)4}] ( 2) (3-py = 3-pyridyl) and [K([18{crown-6){Cp*FeC4(4-py)4}] ( 3) (4-py = 4-pyridyl) were synthesized by reacting two equivalents of bis(3-pyridyl)acetylene and bis(4-pyridyl)acetylene with the naphthalene complex [K([18{crown-6){Cp*Fe(η4-C10H8)}]. Compounds 2 and 3 were fully characterized by X-ray crystallography, 1H and 13C{1H} NMR spectroscopy, UV/Vis spectroscopy, and elemental analysis. They display similar sandwich structures with an η5-coordinated Cp* unit and an η4-coordinated cyclobutadiene moiety. In the solid state, compounds 2 and 3 form distinct polymeric chain structures due to the interaction of the pyridyl nitrogen atoms with the potassium cations. Cyclic voltammetry measurements indicate that the [Cp*FeC4py4]- anions (py = 3-py or 4-py) undergo a reversible one electron oxidation to neutral [Cp*FeC4py4] complexes. A second quasi-reversible redox event is attributed to the oxidation these products to unstable [Cp*FeC4py4]+ cations. The properties of 2 and 3 are compared with those of the previously reported 2-pyridyl complex [K([18{crown-6){Cp*FeC4(2-py)4}] ( 1) [ Dalton Trans . 2014, 43, 4247-4250].
- Subjects
IRON compounds; PYRIDYL compounds; CYCLOBUTADIENE; NAPHTHALENE; OXIDATION; NUCLEAR magnetic resonance spectroscopy
- Publication
Zeitschrift für Anorganische und Allgemeine Chemie, 2015, Vol 641, Issue 12/13, p2065
- ISSN
0044-2313
- Publication type
Article
- DOI
10.1002/zaac.201500235