The photoinduced dynamics of two DTE-BODIPY conjugates A, B with carboxylic acid anchoring groups coupled to the surface of TiO2 were studied by ultrafast transient absorption spectroscopy. For compound A, with an orthogonal orientation of the BODIPY chromophore and the photoswitchable DTE unit, a charge separated state could not be reliably detected. Nevertheless, besides the energy transfer from the BODIPY to the closed DTE, indications for an electron transfer reaction were found by analyzing fluorescence quenching on TiO2 in steady state fluorescence measurements. For compound B with a parallel orientation of chromophore and photoswitch, a charge separated state was conclusively identified via the observation of a positive absorption signal (at λpr > 610 nm) at later delay times. An electron transfer rate of 7 x 1010 s-1 can be extracted, indicating slower processes in the dyads in comparison to previously published electron transfer reactions of DTE compounds coupled to TiO2.
This chapter covers a selection of acyl complexes and synthetic applications published within the past two decades. Iron acyl complexes are useful building blocks for organic synthesis. This survey covers recent synthetic applications of a selection of acyl complexes published within the last two decades. Herein, acyl complexes derived from carbonyl iron reagents are discussed, besides cyclopentadienyl dicarbonyl iron compounds, their phosphine‐substituted chiral‐at‐iron derivatives and diiron acyl complexes. This chapter has been organized according to the above classification with additional ligands and their reactivity, for example allyl, dienes.
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