Complexes binudear

Besides this most general terminal coordination, the allenylidene group can also act as a bridging ligand in binudear complexes via two well-established p-q q (end on) [36] and (side on) [37] modes (F and G, respectively, in Figure 2.8). A... 

Carbon Dioxide Coordination Chemistry and Reactivity of Coordinated CO binudear complexes... 

Our initial interest in these systems was stimulated by observations of their photochemical electron-transfer reactivity (6.12). From spectroscopic and electrochemical studies, the 3(da pa) excited state is predicted to be a powerful reductant, with E (M2 /3M2 ) estimated to range from -0.8 to -2.0 V vs SSCE in CH3CN. That this state is a powerful reductant has been confirmed by investigation of the electron-transfer quenching of 3M2 by a series of pyridinium acceptors with varying reduction potentials ( X For several binudear complexes, the excited-state reduction potenfial cannot be calculated accurately due to the irreversibility of the ground-state electrochemistry but it can be estimated from bimolecular electron-transfer quenching experiments. 

Binudear complexes with polydentate phosphine bridges... 

Nishide and Saito , through the reaction of (S)-2-amino-l-propanol (S-propanol amine, S-Hpra) with the green solution of tricarbonatocobaltate(III), prepared a few binudear complexes with carbonate bridges, from which a few binudear complexes with oxalate bridges were derived. The preparation is shown in Scheme I,... 

A set of bipy-based Ru"/Os" binudear complexes, comprising compounds 21-23 (Fig. 2.13), was prepared such that the energy gap between triplet states localized on donor and acceptor units remained at ca. 0.34 eV [112]. These complexes differed in the site of attachment of the acetylene bridge and used both ethynylene and butadiynylene connectors. Of course, with such systems it is difficult to be definitive about the exact nature of the bridge. It was found, however, that intramolecular triplet energy transfer was extremely fast in each case. There was htde... 

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