3,3',5,5'-Tetrapyridylbiphenyl, a bis-cyclometalating bridging ligand with a high coupling ability in ruthenium(III), ruthenium(II) mixed valence systems

Abstract

of mass collision energy (421 eV) for these C60"+ collisions with argon.Capture of simple molecular gases undergoing high-energy collisions with fullerene ions could not be documented previously.6For example, collisions of C60*+ with D2 gave rise to no Dor D2-containing products.6 We were able, however, to detect both CeoD-1" and C60D2,+ (see Figure 4). The inability to detect lower mass product ions containing D or D2 in the experiments reported here and elsewhere6 may be due to rupture of the D-D bond with subsequent loss of the deuteriums.The results given here will be elaborated in a comprehensive report of the products and energetics of high-energy collisions of C60,+, C70*+, and other fullerene radical cations with a number of target gases.10 Other issues addressed include the kinetic energy of product ions that contain the target gas, the variation of the spectra of product ions as a function of both energy and number of collisions, and the end points in the capture processes. Comparison of the predicted kinetic energies of product ions with the observed values convinces us that the majority of the fullerene product ions produced from high-energy collisions with small target gases result from fragmentation of the intermediate fullerene endohedral complex.10 Acknowledgment. This work was supported by the National Science Foundation (Grant No. CHE 9017250). We acknowledge Robert Bateman of VG Analytical (Fisons Instruments), who designed the four-sector tandem mass spectrometer and provided advice on experimental aspects of this work.

Cyclometalation Using d-Block Transition Metals: Fundamental Aspects and Recent Trends

“…for solar cells 269 or intervalence electron transfer systems. 67,270,271 Moreover, ruthenacycles are amongst the most active catalysts known to date for transfer hydrogenation reactions. 272,273 An excellent review has recently appeared, 28 which compiles a vast range of precursors and ligand settings used for cycloruthenation.…”

Construction of One‐Dimensional Multicomponent Molecular Arrays: Control of Electronic and Molecular Motions

“…Figure 10. Synthetic steps leading to bis-cyclometallating ligands cyclometallating Ligands Initially, dpbH was prepared according to a synthetic procedure described previously by Bönnemann for 2,2Ј-(1,4-phenylene)dipyridine [64] [65] . A more convenient method employs the mild aromatic cross-coupling reaction originally described by Stille et al [66] The design of multicomponent systems incorporating these new chromophores and electrophores requires the synthesis of rigid, symmetrical bis-cyclometallating ligands.…”

Computational investigations of click-derived 1,2,3-triazoles as keystone ligands for complexation with transition metals: a review

“…In this respect, aryl azides react with diethynylbenzene building blocks, in good yields using a standard click procedure. [112][113][114] With the purpose of blocking alternatives, methyl groups were placed at strategic positions when possible and reasonable. 115 Therefore, o-xylene was selected as the central ring and mesityl species were selected for the clicked-on functionalities (Scheme 5).…”