Co(II)−Co(II) Paddlewheel Complex with a Redox-Active Ligand Derived from TTF

Abstract

A new trimethyltetrathiafulvalene (Me3TTF) derivative Me3TTF-CH=CH-py bearing a pyridyl was synthesized and coordinated to a cobalt(II) benzoate dimer, having paddlewheel core structure, leading to a complex formulated as Co2(PhCOO)4(Me3TTF-CH=CH-py)2. Single-crystal X-ray diffraction studies of the complex performed at 293 and 100 K evidenced the existence of a weak metal-metal interaction. Magnetic studies revealed an antiferromagnetic behavior, which is explained as the result of the direct exchange between metal centers.

Tetrathiafulvalene-based group XV ligands: Synthesis, coordination chemistry and radical cation salts

“…19. Molecular structure of Co5 [22]. distance of 3.56 Å, much longer than in the previous case (vide supra).…”

“…The second series of Co II complexes (Co5-Co7, Scheme 48) was reported by Ouahab et al and consists in the combination of [Co II 2 ] dimers [22] or [Co II 2 M II ] (M II = Co II , Mn II ) trimers [115] stabilized by bridging benzoate PhCOO − ligands, with monodentate TTF-ethenyl-pyridines 14a and 14b.…”

“…According to the same Wittig approach, the mono and the bis-pyridylethenyl-TTF derivatives 14b, 15 and 16 were prepared (Scheme 5) [20][21][22]. These pyridyl-TTF derivatives were first investigated as precursors of donor-acceptor diads, in TTF-(- Table 1 Oxidation potential of TTF-pyridines 2-13 (in V, scanning rate 100 mV/s, using TBAPF6 as supporting electrolyte and Pt working electrode).…”

Engineering MIL‐88B crystallites for enhanced H 2 uptake capacity: The role of ultramicropores

“…We have confirmed that we have formed the skeletal of our MOFs by the peaks obtained in between the wavelengths 1300 and 1650 cm −1 . Peaks at 1385 and 1589 cm −1 illustrate that TPA was attached successfully to the metal center …”

The ubiquitous paddle-wheel building block in two-dimensional coordination polymers with square grid structure

“…but in the range of Co···Co distances measured in other structures with Co 2 (RCOO)4 cluster[19][20][21][22]. The metal(II) PW clusters in 1 and 2 are bridged with BDC to form infinite polymeric 2-D (4 4 ) layers parallel to (1 0 2) planes with M 2 (CO 2 ) 4 as nodes (figure 1c).Each 2-D layer forms a square grid of ~ 10.58-10.58 Å 2 dimension and are stacked perpendicular to (1 0 2) planes with an offset which allows the pyridine molecules from the adjacent layers to fill the square aperture of the layer as shown in figure 2a.…”