Enhancement of Light Absorption Ability of Synthetic Chlorophyll Derivatives by Conjugation with Difluoroboron Diketonate Group was written by Kinoshita, Yusuke;Kitagawa, Yuichi;Tamiaki, Hitoshi. And the article was included in Chemistry – A European Journal in 2016.COA of Formula: C18H11BrO The following contents are mentioned in the article:
The enhancement of the light absorption ability of synthetic chlorophyll derivatives is demonstrated. Chlorophyll derivatives directly conjugated with a difluoroboron 1,3-diketonate group at the C3 position were synthesized from Me pyropheophorbide-d through Barbier acylmethylation of the C3-formyl moiety, oxidation of the C3-carbinol, and difluoroboron complexation of the diketonate. Electronic absorption spectra in a diluted solution showed that the synthetic conjugates gave an absorption band at λ=400-500 nm, with a Qy band shifted to a longer wavelength of λ≈700 nm. DFT calculations demonstrated that the absorption bands and red shifts were ascribable to the coupling of the LUMO of chlorin with that of the difluoroboron diketonate moiety. The introduction of a pyrenyl group at the C33-position of the conjugate afforded an addnl. charge-transfer band over λ=500 nm, producing a pigment that bridged the green gap in standard chlorophylls. This study involved multiple reactions and reactants, such as 2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5COA of Formula: C18H11BrO).
2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5) belongs to organobromine compounds. Most organobromine compounds, like most organohalide compounds, are relatively nonpolar. Many of the alkyl bromine derivatives are excellent alkylating agents since bromides are good leaving groups. Tribromides, like tetrabutylammonium tribromide, are used as a solid source of bromine. N-bromosuccimide (NBS) is used for the selective bromination of allylic bonds.COA of Formula: C18H11BrO
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary