3/27/2023 0 Comments Tuning the anchoring fd virusesThe presence of the spacer results in enhanced performances of the dyes, and the highest energy conversion efficiencies are observed for the dyes +(η= 2.43% compared to 5.96% for standard dye N719) and +(η= 2.89% compared to 5.96% for N719). The complexes have been used to prepare dye-sensitized solar cells (DSCs) incorporating heteroleptic dyes of type +where L is1–5and Lanchoris a 6,6′-dimethyl-2,2′-bipyridine functionalized in the 4- and 4′-positions with phosphonic acid groups with (Lanchor=7) and without (Lanchor=6) a spacer between the metal-binding and anchoring domains. Cyclic voltammetric data show that oxidation of the copper(i) centre occurs at a more positive potential in, and than in or with the latter being oxidized at the lowest potential. In contrast, the absorption spectrum of shows two broad bands in the visible region. The solution absorption spectra of the complexes with ligands1–4are virtually identical with an MLCT band with values ofλmax= 481–488 nm. The first three structures show similar distorted tetrahedral environments for the Cu+ions with angles between the least squares planes of the bpy domains of 85.6, 86.4 and 82.9°, respectively in contrast, the Cu+ion in ♼H2Cl2is in a flattened coordinate environment due to intra-cation face-to-face π-interactions. The single crystal structures of 2♾t2O and ♼H2Cl2have been determined. The new ligands2–5and copper(i) complexes (L =1–5) have been fully characterized. The syntheses of five homoleptic copper(i) complexes are described in which L is a 4,4′-di(4-bromophenyl)-6,6′-dialkyl-2,2′-bipyridine ligand (compounds1–4with methyl,nbutyl,isobutyl and hexyl substituents, respectively) or 4,4′-di(4-bromophenyl)-6,6′-diphenyl-2,2′-bipyridine (5).
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