A Ruthenium–Iron Bimetallic Supramolecular Cage with D₄ Symmetry from a Tetrapyridyl Iron(I) Metalloligand

Abstract

The novel iron(I) sandwich compound [Cp*Fe(η 4 -C 4 Py 4 )] (1) was prepared and characterized by various methods, including X-ray crystallography. Coordination-driven self-assembly of a diruthenium acceptor with the tetrapyridyl metalloligand [Cp*Fe(I)(η 4 -C 4 Py 4 )] led to a D 4 -symmetric three-dimensional M 4 L 2 tetragonal supramolecular cage. This cage was characterized by IR and high-resolution electrospray ionization mass spectrometry. Its solid-state structure was confirmed by X-ray crystallography, showing a novel D 4 cage system.

Synthesis and Characterization of Tetra(pyridyl)cyclo­butadiene Iron Complexes [Cp*Fe(C4py4)]– (py = 3‐pyridyl and 4‐pyridyl, Cp* = C5Me5)

“…( Figure 1) was previously isolated by Lee and co-workers via a different route. [7] A second, quasi-reversible oxidation step is observed at more positive anodic peak potentials of 0.13 V vs. Fc/Fc + for 2, and 0.22 V vs. Fc/Fc + for 3. We presume that this second process may correspond to the oxidation of the neutral species to unstable 6e cations [Cp*FeC 4 (3-py) 4 ] + and [Cp*FeC 4 (4-py) 4 ] + .…”

“…[4][5][6] More recently, Lee et al used the coordination of the 4-pyridyl-substituted complex C to a diruthenium acceptor to construct a Ru 4 L 2 tetragonal-prismatic cage. [7] This compound was also crystallographically characterized.…”

“…The groups of Stang and Michl also used B as a building block for large supramolecular cages. They discovered that the self-assembly [2][3][4]7,9] www.zaac.wiley-vch.de…”

Hetero‐Multinuclear Co2Pt8 Supramolecular Cages Having D4 Symmetry from Tetrapyridyl Metalloligands

“…27,30,35,36 NMR spectra were recorded on a Varian Unity instrument (300 MHz). Deuterated solvents were purchased from Cambridge Isotope Laboratory (Andover, MA, USA).…”

“…[27][28][29] It contains cobalt metallocene fragment that is analogous to ferrocene having interesting electrochemical property. [27][28][29] It contains cobalt metallocene fragment that is analogous to ferrocene having interesting electrochemical property.…”